4 * \brief Public Key abstraction layer
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7 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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8 * SPDX-License-Identifier: Apache-2.0
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10 * Licensed under the Apache License, Version 2.0 (the "License"); you may
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11 * not use this file except in compliance with the License.
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12 * You may obtain a copy of the License at
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14 * http://www.apache.org/licenses/LICENSE-2.0
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16 * Unless required by applicable law or agreed to in writing, software
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17 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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18 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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19 * See the License for the specific language governing permissions and
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20 * limitations under the License.
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22 * This file is part of mbed TLS (https://tls.mbed.org)
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25 #ifndef MBEDTLS_PK_H
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26 #define MBEDTLS_PK_H
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28 #if !defined(MBEDTLS_CONFIG_FILE)
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31 #include MBEDTLS_CONFIG_FILE
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36 #if defined(MBEDTLS_RSA_C)
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40 #if defined(MBEDTLS_ECP_C)
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44 #if defined(MBEDTLS_ECDSA_C)
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48 #if defined(MBEDTLS_USE_PSA_CRYPTO)
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49 #include "psa/crypto.h"
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52 #if ( defined(__ARMCC_VERSION) || defined(_MSC_VER) ) && \
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53 !defined(inline) && !defined(__cplusplus)
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54 #define inline __inline
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57 #define MBEDTLS_ERR_PK_ALLOC_FAILED -0x3F80 /**< Memory allocation failed. */
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58 #define MBEDTLS_ERR_PK_TYPE_MISMATCH -0x3F00 /**< Type mismatch, eg attempt to encrypt with an ECDSA key */
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59 #define MBEDTLS_ERR_PK_BAD_INPUT_DATA -0x3E80 /**< Bad input parameters to function. */
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60 #define MBEDTLS_ERR_PK_FILE_IO_ERROR -0x3E00 /**< Read/write of file failed. */
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61 #define MBEDTLS_ERR_PK_KEY_INVALID_VERSION -0x3D80 /**< Unsupported key version */
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62 #define MBEDTLS_ERR_PK_KEY_INVALID_FORMAT -0x3D00 /**< Invalid key tag or value. */
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63 #define MBEDTLS_ERR_PK_UNKNOWN_PK_ALG -0x3C80 /**< Key algorithm is unsupported (only RSA and EC are supported). */
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64 #define MBEDTLS_ERR_PK_PASSWORD_REQUIRED -0x3C00 /**< Private key password can't be empty. */
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65 #define MBEDTLS_ERR_PK_PASSWORD_MISMATCH -0x3B80 /**< Given private key password does not allow for correct decryption. */
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66 #define MBEDTLS_ERR_PK_INVALID_PUBKEY -0x3B00 /**< The pubkey tag or value is invalid (only RSA and EC are supported). */
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67 #define MBEDTLS_ERR_PK_INVALID_ALG -0x3A80 /**< The algorithm tag or value is invalid. */
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68 #define MBEDTLS_ERR_PK_UNKNOWN_NAMED_CURVE -0x3A00 /**< Elliptic curve is unsupported (only NIST curves are supported). */
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69 #define MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE -0x3980 /**< Unavailable feature, e.g. RSA disabled for RSA key. */
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70 #define MBEDTLS_ERR_PK_SIG_LEN_MISMATCH -0x3900 /**< The buffer contains a valid signature followed by more data. */
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72 /* MBEDTLS_ERR_PK_HW_ACCEL_FAILED is deprecated and should not be used. */
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73 #define MBEDTLS_ERR_PK_HW_ACCEL_FAILED -0x3880 /**< PK hardware accelerator failed. */
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80 * \brief Public key types
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86 MBEDTLS_PK_ECKEY_DH,
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89 MBEDTLS_PK_RSASSA_PSS,
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91 } mbedtls_pk_type_t;
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94 * \brief Options for RSASSA-PSS signature verification.
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95 * See \c mbedtls_rsa_rsassa_pss_verify_ext()
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97 typedef struct mbedtls_pk_rsassa_pss_options
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99 mbedtls_md_type_t mgf1_hash_id;
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100 int expected_salt_len;
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102 } mbedtls_pk_rsassa_pss_options;
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105 * \brief Types for interfacing with the debug module
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109 MBEDTLS_PK_DEBUG_NONE = 0,
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110 MBEDTLS_PK_DEBUG_MPI,
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111 MBEDTLS_PK_DEBUG_ECP,
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112 } mbedtls_pk_debug_type;
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115 * \brief Item to send to the debug module
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117 typedef struct mbedtls_pk_debug_item
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119 mbedtls_pk_debug_type type;
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122 } mbedtls_pk_debug_item;
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124 /** Maximum number of item send for debugging, plus 1 */
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125 #define MBEDTLS_PK_DEBUG_MAX_ITEMS 3
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128 * \brief Public key information and operations
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130 typedef struct mbedtls_pk_info_t mbedtls_pk_info_t;
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133 * \brief Public key container
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135 typedef struct mbedtls_pk_context
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137 const mbedtls_pk_info_t * pk_info; /**< Public key information */
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138 void * pk_ctx; /**< Underlying public key context */
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139 } mbedtls_pk_context;
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141 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
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143 * \brief Context for resuming operations
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147 const mbedtls_pk_info_t * pk_info; /**< Public key information */
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148 void * rs_ctx; /**< Underlying restart context */
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149 } mbedtls_pk_restart_ctx;
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150 #else /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
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151 /* Now we can declare functions that take a pointer to that */
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152 typedef void mbedtls_pk_restart_ctx;
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153 #endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
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155 #if defined(MBEDTLS_RSA_C)
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157 * Quick access to an RSA context inside a PK context.
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159 * \warning You must make sure the PK context actually holds an RSA context
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160 * before using this function!
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162 static inline mbedtls_rsa_context *mbedtls_pk_rsa( const mbedtls_pk_context pk )
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164 return( (mbedtls_rsa_context *) (pk).pk_ctx );
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166 #endif /* MBEDTLS_RSA_C */
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168 #if defined(MBEDTLS_ECP_C)
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170 * Quick access to an EC context inside a PK context.
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172 * \warning You must make sure the PK context actually holds an EC context
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173 * before using this function!
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175 static inline mbedtls_ecp_keypair *mbedtls_pk_ec( const mbedtls_pk_context pk )
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177 return( (mbedtls_ecp_keypair *) (pk).pk_ctx );
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179 #endif /* MBEDTLS_ECP_C */
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181 #if defined(MBEDTLS_PK_RSA_ALT_SUPPORT)
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183 * \brief Types for RSA-alt abstraction
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185 typedef int (*mbedtls_pk_rsa_alt_decrypt_func)( void *ctx, int mode, size_t *olen,
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186 const unsigned char *input, unsigned char *output,
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187 size_t output_max_len );
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188 typedef int (*mbedtls_pk_rsa_alt_sign_func)( void *ctx,
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189 int (*f_rng)(void *, unsigned char *, size_t), void *p_rng,
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190 int mode, mbedtls_md_type_t md_alg, unsigned int hashlen,
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191 const unsigned char *hash, unsigned char *sig );
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192 typedef size_t (*mbedtls_pk_rsa_alt_key_len_func)( void *ctx );
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193 #endif /* MBEDTLS_PK_RSA_ALT_SUPPORT */
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196 * \brief Return information associated with the given PK type
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198 * \param pk_type PK type to search for.
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200 * \return The PK info associated with the type or NULL if not found.
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202 const mbedtls_pk_info_t *mbedtls_pk_info_from_type( mbedtls_pk_type_t pk_type );
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205 * \brief Initialize a #mbedtls_pk_context (as NONE).
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207 * \param ctx The context to initialize.
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208 * This must not be \c NULL.
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210 void mbedtls_pk_init( mbedtls_pk_context *ctx );
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213 * \brief Free the components of a #mbedtls_pk_context.
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215 * \param ctx The context to clear. It must have been initialized.
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216 * If this is \c NULL, this function does nothing.
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218 * \note For contexts that have been set up with
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219 * mbedtls_pk_setup_opaque(), this does not free the underlying
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220 * key slot and you still need to call psa_destroy_key()
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221 * independently if you want to destroy that key.
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223 void mbedtls_pk_free( mbedtls_pk_context *ctx );
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225 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
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227 * \brief Initialize a restart context
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229 * \param ctx The context to initialize.
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230 * This must not be \c NULL.
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232 void mbedtls_pk_restart_init( mbedtls_pk_restart_ctx *ctx );
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235 * \brief Free the components of a restart context
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237 * \param ctx The context to clear. It must have been initialized.
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238 * If this is \c NULL, this function does nothing.
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240 void mbedtls_pk_restart_free( mbedtls_pk_restart_ctx *ctx );
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241 #endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
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244 * \brief Initialize a PK context with the information given
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245 * and allocates the type-specific PK subcontext.
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247 * \param ctx Context to initialize. It must not have been set
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248 * up yet (type #MBEDTLS_PK_NONE).
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249 * \param info Information to use
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251 * \return 0 on success,
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252 * MBEDTLS_ERR_PK_BAD_INPUT_DATA on invalid input,
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253 * MBEDTLS_ERR_PK_ALLOC_FAILED on allocation failure.
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255 * \note For contexts holding an RSA-alt key, use
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256 * \c mbedtls_pk_setup_rsa_alt() instead.
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258 int mbedtls_pk_setup( mbedtls_pk_context *ctx, const mbedtls_pk_info_t *info );
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260 #if defined(MBEDTLS_USE_PSA_CRYPTO)
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262 * \brief Initialize a PK context to wrap a PSA key slot.
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264 * \note This function replaces mbedtls_pk_setup() for contexts
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265 * that wrap a (possibly opaque) PSA key slot instead of
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266 * storing and manipulating the key material directly.
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268 * \param ctx The context to initialize. It must be empty (type NONE).
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269 * \param key The PSA key slot to wrap, which must hold an ECC key pair
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270 * (see notes below).
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272 * \note The wrapped key slot must remain valid as long as the
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273 * wrapping PK context is in use, that is at least between
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274 * the point this function is called and the point
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275 * mbedtls_pk_free() is called on this context. The wrapped
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276 * key slot might then be independently used or destroyed.
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278 * \note This function is currently only available for ECC key
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279 * pairs (that is, ECC keys containing private key material).
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280 * Support for other key types may be added later.
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282 * \return \c 0 on success.
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283 * \return #MBEDTLS_ERR_PK_BAD_INPUT_DATA on invalid input
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284 * (context already used, invalid key slot).
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285 * \return #MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE if the key is not an
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287 * \return #MBEDTLS_ERR_PK_ALLOC_FAILED on allocation failure.
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289 int mbedtls_pk_setup_opaque( mbedtls_pk_context *ctx, const psa_key_handle_t key );
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290 #endif /* MBEDTLS_USE_PSA_CRYPTO */
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292 #if defined(MBEDTLS_PK_RSA_ALT_SUPPORT)
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294 * \brief Initialize an RSA-alt context
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296 * \param ctx Context to initialize. It must not have been set
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297 * up yet (type #MBEDTLS_PK_NONE).
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298 * \param key RSA key pointer
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299 * \param decrypt_func Decryption function
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300 * \param sign_func Signing function
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301 * \param key_len_func Function returning key length in bytes
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303 * \return 0 on success, or MBEDTLS_ERR_PK_BAD_INPUT_DATA if the
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304 * context wasn't already initialized as RSA_ALT.
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306 * \note This function replaces \c mbedtls_pk_setup() for RSA-alt.
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308 int mbedtls_pk_setup_rsa_alt( mbedtls_pk_context *ctx, void * key,
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309 mbedtls_pk_rsa_alt_decrypt_func decrypt_func,
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310 mbedtls_pk_rsa_alt_sign_func sign_func,
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311 mbedtls_pk_rsa_alt_key_len_func key_len_func );
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312 #endif /* MBEDTLS_PK_RSA_ALT_SUPPORT */
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315 * \brief Get the size in bits of the underlying key
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317 * \param ctx The context to query. It must have been initialized.
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319 * \return Key size in bits, or 0 on error
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321 size_t mbedtls_pk_get_bitlen( const mbedtls_pk_context *ctx );
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324 * \brief Get the length in bytes of the underlying key
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326 * \param ctx The context to query. It must have been initialized.
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328 * \return Key length in bytes, or 0 on error
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330 static inline size_t mbedtls_pk_get_len( const mbedtls_pk_context *ctx )
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332 return( ( mbedtls_pk_get_bitlen( ctx ) + 7 ) / 8 );
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336 * \brief Tell if a context can do the operation given by type
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338 * \param ctx The context to query. It must have been initialized.
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339 * \param type The desired type.
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341 * \return 1 if the context can do operations on the given type.
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342 * \return 0 if the context cannot do the operations on the given
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343 * type. This is always the case for a context that has
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344 * been initialized but not set up, or that has been
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345 * cleared with mbedtls_pk_free().
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347 int mbedtls_pk_can_do( const mbedtls_pk_context *ctx, mbedtls_pk_type_t type );
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350 * \brief Verify signature (including padding if relevant).
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352 * \param ctx The PK context to use. It must have been set up.
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353 * \param md_alg Hash algorithm used (see notes)
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354 * \param hash Hash of the message to sign
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355 * \param hash_len Hash length or 0 (see notes)
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356 * \param sig Signature to verify
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357 * \param sig_len Signature length
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359 * \return 0 on success (signature is valid),
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360 * #MBEDTLS_ERR_PK_SIG_LEN_MISMATCH if there is a valid
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361 * signature in sig but its length is less than \p siglen,
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362 * or a specific error code.
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364 * \note For RSA keys, the default padding type is PKCS#1 v1.5.
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365 * Use \c mbedtls_pk_verify_ext( MBEDTLS_PK_RSASSA_PSS, ... )
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366 * to verify RSASSA_PSS signatures.
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368 * \note If hash_len is 0, then the length associated with md_alg
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369 * is used instead, or an error returned if it is invalid.
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371 * \note md_alg may be MBEDTLS_MD_NONE, only if hash_len != 0
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373 int mbedtls_pk_verify( mbedtls_pk_context *ctx, mbedtls_md_type_t md_alg,
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374 const unsigned char *hash, size_t hash_len,
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375 const unsigned char *sig, size_t sig_len );
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378 * \brief Restartable version of \c mbedtls_pk_verify()
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380 * \note Performs the same job as \c mbedtls_pk_verify(), but can
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381 * return early and restart according to the limit set with
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382 * \c mbedtls_ecp_set_max_ops() to reduce blocking for ECC
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383 * operations. For RSA, same as \c mbedtls_pk_verify().
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385 * \param ctx The PK context to use. It must have been set up.
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386 * \param md_alg Hash algorithm used (see notes)
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387 * \param hash Hash of the message to sign
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388 * \param hash_len Hash length or 0 (see notes)
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389 * \param sig Signature to verify
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390 * \param sig_len Signature length
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391 * \param rs_ctx Restart context (NULL to disable restart)
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393 * \return See \c mbedtls_pk_verify(), or
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394 * \return #MBEDTLS_ERR_ECP_IN_PROGRESS if maximum number of
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395 * operations was reached: see \c mbedtls_ecp_set_max_ops().
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397 int mbedtls_pk_verify_restartable( mbedtls_pk_context *ctx,
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398 mbedtls_md_type_t md_alg,
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399 const unsigned char *hash, size_t hash_len,
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400 const unsigned char *sig, size_t sig_len,
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401 mbedtls_pk_restart_ctx *rs_ctx );
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404 * \brief Verify signature, with options.
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405 * (Includes verification of the padding depending on type.)
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407 * \param type Signature type (inc. possible padding type) to verify
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408 * \param options Pointer to type-specific options, or NULL
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409 * \param ctx The PK context to use. It must have been set up.
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410 * \param md_alg Hash algorithm used (see notes)
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411 * \param hash Hash of the message to sign
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412 * \param hash_len Hash length or 0 (see notes)
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413 * \param sig Signature to verify
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414 * \param sig_len Signature length
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416 * \return 0 on success (signature is valid),
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417 * #MBEDTLS_ERR_PK_TYPE_MISMATCH if the PK context can't be
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418 * used for this type of signatures,
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419 * #MBEDTLS_ERR_PK_SIG_LEN_MISMATCH if there is a valid
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420 * signature in sig but its length is less than \p siglen,
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421 * or a specific error code.
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423 * \note If hash_len is 0, then the length associated with md_alg
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424 * is used instead, or an error returned if it is invalid.
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426 * \note md_alg may be MBEDTLS_MD_NONE, only if hash_len != 0
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428 * \note If type is MBEDTLS_PK_RSASSA_PSS, then options must point
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429 * to a mbedtls_pk_rsassa_pss_options structure,
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430 * otherwise it must be NULL.
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432 int mbedtls_pk_verify_ext( mbedtls_pk_type_t type, const void *options,
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433 mbedtls_pk_context *ctx, mbedtls_md_type_t md_alg,
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434 const unsigned char *hash, size_t hash_len,
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435 const unsigned char *sig, size_t sig_len );
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438 * \brief Make signature, including padding if relevant.
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440 * \param ctx The PK context to use. It must have been set up
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441 * with a private key.
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442 * \param md_alg Hash algorithm used (see notes)
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443 * \param hash Hash of the message to sign
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444 * \param hash_len Hash length or 0 (see notes)
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445 * \param sig Place to write the signature
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446 * \param sig_len Number of bytes written
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447 * \param f_rng RNG function
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448 * \param p_rng RNG parameter
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450 * \return 0 on success, or a specific error code.
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452 * \note For RSA keys, the default padding type is PKCS#1 v1.5.
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453 * There is no interface in the PK module to make RSASSA-PSS
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456 * \note If hash_len is 0, then the length associated with md_alg
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457 * is used instead, or an error returned if it is invalid.
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459 * \note For RSA, md_alg may be MBEDTLS_MD_NONE if hash_len != 0.
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460 * For ECDSA, md_alg may never be MBEDTLS_MD_NONE.
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462 int mbedtls_pk_sign( mbedtls_pk_context *ctx, mbedtls_md_type_t md_alg,
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463 const unsigned char *hash, size_t hash_len,
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464 unsigned char *sig, size_t *sig_len,
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465 int (*f_rng)(void *, unsigned char *, size_t), void *p_rng );
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468 * \brief Restartable version of \c mbedtls_pk_sign()
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470 * \note Performs the same job as \c mbedtls_pk_sign(), but can
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471 * return early and restart according to the limit set with
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472 * \c mbedtls_ecp_set_max_ops() to reduce blocking for ECC
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473 * operations. For RSA, same as \c mbedtls_pk_sign().
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475 * \param ctx The PK context to use. It must have been set up
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476 * with a private key.
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477 * \param md_alg Hash algorithm used (see notes)
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478 * \param hash Hash of the message to sign
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479 * \param hash_len Hash length or 0 (see notes)
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480 * \param sig Place to write the signature
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481 * \param sig_len Number of bytes written
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482 * \param f_rng RNG function
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483 * \param p_rng RNG parameter
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484 * \param rs_ctx Restart context (NULL to disable restart)
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486 * \return See \c mbedtls_pk_sign(), or
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487 * \return #MBEDTLS_ERR_ECP_IN_PROGRESS if maximum number of
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488 * operations was reached: see \c mbedtls_ecp_set_max_ops().
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490 int mbedtls_pk_sign_restartable( mbedtls_pk_context *ctx,
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491 mbedtls_md_type_t md_alg,
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492 const unsigned char *hash, size_t hash_len,
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493 unsigned char *sig, size_t *sig_len,
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494 int (*f_rng)(void *, unsigned char *, size_t), void *p_rng,
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495 mbedtls_pk_restart_ctx *rs_ctx );
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498 * \brief Decrypt message (including padding if relevant).
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500 * \param ctx The PK context to use. It must have been set up
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501 * with a private key.
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502 * \param input Input to decrypt
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503 * \param ilen Input size
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504 * \param output Decrypted output
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505 * \param olen Decrypted message length
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506 * \param osize Size of the output buffer
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507 * \param f_rng RNG function
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508 * \param p_rng RNG parameter
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510 * \note For RSA keys, the default padding type is PKCS#1 v1.5.
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512 * \return 0 on success, or a specific error code.
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514 int mbedtls_pk_decrypt( mbedtls_pk_context *ctx,
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515 const unsigned char *input, size_t ilen,
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516 unsigned char *output, size_t *olen, size_t osize,
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517 int (*f_rng)(void *, unsigned char *, size_t), void *p_rng );
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520 * \brief Encrypt message (including padding if relevant).
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522 * \param ctx The PK context to use. It must have been set up.
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523 * \param input Message to encrypt
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524 * \param ilen Message size
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525 * \param output Encrypted output
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526 * \param olen Encrypted output length
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527 * \param osize Size of the output buffer
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528 * \param f_rng RNG function
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529 * \param p_rng RNG parameter
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531 * \note For RSA keys, the default padding type is PKCS#1 v1.5.
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533 * \return 0 on success, or a specific error code.
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535 int mbedtls_pk_encrypt( mbedtls_pk_context *ctx,
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536 const unsigned char *input, size_t ilen,
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537 unsigned char *output, size_t *olen, size_t osize,
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538 int (*f_rng)(void *, unsigned char *, size_t), void *p_rng );
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541 * \brief Check if a public-private pair of keys matches.
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543 * \param pub Context holding a public key.
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544 * \param prv Context holding a private (and public) key.
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546 * \return \c 0 on success (keys were checked and match each other).
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547 * \return #MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE if the keys could not
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548 * be checked - in that case they may or may not match.
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549 * \return #MBEDTLS_ERR_PK_BAD_INPUT_DATA if a context is invalid.
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550 * \return Another non-zero value if the keys do not match.
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552 int mbedtls_pk_check_pair( const mbedtls_pk_context *pub, const mbedtls_pk_context *prv );
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555 * \brief Export debug information
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557 * \param ctx The PK context to use. It must have been initialized.
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558 * \param items Place to write debug items
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560 * \return 0 on success or MBEDTLS_ERR_PK_BAD_INPUT_DATA
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562 int mbedtls_pk_debug( const mbedtls_pk_context *ctx, mbedtls_pk_debug_item *items );
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565 * \brief Access the type name
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567 * \param ctx The PK context to use. It must have been initialized.
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569 * \return Type name on success, or "invalid PK"
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571 const char * mbedtls_pk_get_name( const mbedtls_pk_context *ctx );
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574 * \brief Get the key type
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576 * \param ctx The PK context to use. It must have been initialized.
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578 * \return Type on success.
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579 * \return #MBEDTLS_PK_NONE for a context that has not been set up.
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581 mbedtls_pk_type_t mbedtls_pk_get_type( const mbedtls_pk_context *ctx );
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583 #if defined(MBEDTLS_PK_PARSE_C)
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584 /** \ingroup pk_module */
\r
586 * \brief Parse a private key in PEM or DER format
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588 * \param ctx The PK context to fill. It must have been initialized
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590 * \param key Input buffer to parse.
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591 * The buffer must contain the input exactly, with no
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592 * extra trailing material. For PEM, the buffer must
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593 * contain a null-terminated string.
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594 * \param keylen Size of \b key in bytes.
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595 * For PEM data, this includes the terminating null byte,
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596 * so \p keylen must be equal to `strlen(key) + 1`.
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597 * \param pwd Optional password for decryption.
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598 * Pass \c NULL if expecting a non-encrypted key.
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599 * Pass a string of \p pwdlen bytes if expecting an encrypted
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600 * key; a non-encrypted key will also be accepted.
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601 * The empty password is not supported.
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602 * \param pwdlen Size of the password in bytes.
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603 * Ignored if \p pwd is \c NULL.
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605 * \note On entry, ctx must be empty, either freshly initialised
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606 * with mbedtls_pk_init() or reset with mbedtls_pk_free(). If you need a
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607 * specific key type, check the result with mbedtls_pk_can_do().
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609 * \note The key is also checked for correctness.
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611 * \return 0 if successful, or a specific PK or PEM error code
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613 int mbedtls_pk_parse_key( mbedtls_pk_context *ctx,
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614 const unsigned char *key, size_t keylen,
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615 const unsigned char *pwd, size_t pwdlen );
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617 /** \ingroup pk_module */
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619 * \brief Parse a public key in PEM or DER format
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621 * \param ctx The PK context to fill. It must have been initialized
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623 * \param key Input buffer to parse.
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624 * The buffer must contain the input exactly, with no
\r
625 * extra trailing material. For PEM, the buffer must
\r
626 * contain a null-terminated string.
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627 * \param keylen Size of \b key in bytes.
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628 * For PEM data, this includes the terminating null byte,
\r
629 * so \p keylen must be equal to `strlen(key) + 1`.
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631 * \note On entry, ctx must be empty, either freshly initialised
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632 * with mbedtls_pk_init() or reset with mbedtls_pk_free(). If you need a
\r
633 * specific key type, check the result with mbedtls_pk_can_do().
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635 * \note The key is also checked for correctness.
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637 * \return 0 if successful, or a specific PK or PEM error code
\r
639 int mbedtls_pk_parse_public_key( mbedtls_pk_context *ctx,
\r
640 const unsigned char *key, size_t keylen );
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642 #if defined(MBEDTLS_FS_IO)
\r
643 /** \ingroup pk_module */
\r
645 * \brief Load and parse a private key
\r
647 * \param ctx The PK context to fill. It must have been initialized
\r
649 * \param path filename to read the private key from
\r
650 * \param password Optional password to decrypt the file.
\r
651 * Pass \c NULL if expecting a non-encrypted key.
\r
652 * Pass a null-terminated string if expecting an encrypted
\r
653 * key; a non-encrypted key will also be accepted.
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654 * The empty password is not supported.
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656 * \note On entry, ctx must be empty, either freshly initialised
\r
657 * with mbedtls_pk_init() or reset with mbedtls_pk_free(). If you need a
\r
658 * specific key type, check the result with mbedtls_pk_can_do().
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660 * \note The key is also checked for correctness.
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662 * \return 0 if successful, or a specific PK or PEM error code
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664 int mbedtls_pk_parse_keyfile( mbedtls_pk_context *ctx,
\r
665 const char *path, const char *password );
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667 /** \ingroup pk_module */
\r
669 * \brief Load and parse a public key
\r
671 * \param ctx The PK context to fill. It must have been initialized
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673 * \param path filename to read the public key from
\r
675 * \note On entry, ctx must be empty, either freshly initialised
\r
676 * with mbedtls_pk_init() or reset with mbedtls_pk_free(). If
\r
677 * you need a specific key type, check the result with
\r
678 * mbedtls_pk_can_do().
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680 * \note The key is also checked for correctness.
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682 * \return 0 if successful, or a specific PK or PEM error code
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684 int mbedtls_pk_parse_public_keyfile( mbedtls_pk_context *ctx, const char *path );
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685 #endif /* MBEDTLS_FS_IO */
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686 #endif /* MBEDTLS_PK_PARSE_C */
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688 #if defined(MBEDTLS_PK_WRITE_C)
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690 * \brief Write a private key to a PKCS#1 or SEC1 DER structure
\r
691 * Note: data is written at the end of the buffer! Use the
\r
692 * return value to determine where you should start
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695 * \param ctx PK context which must contain a valid private key.
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696 * \param buf buffer to write to
\r
697 * \param size size of the buffer
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699 * \return length of data written if successful, or a specific
\r
702 int mbedtls_pk_write_key_der( mbedtls_pk_context *ctx, unsigned char *buf, size_t size );
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705 * \brief Write a public key to a SubjectPublicKeyInfo DER structure
\r
706 * Note: data is written at the end of the buffer! Use the
\r
707 * return value to determine where you should start
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710 * \param ctx PK context which must contain a valid public or private key.
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711 * \param buf buffer to write to
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712 * \param size size of the buffer
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714 * \return length of data written if successful, or a specific
\r
717 int mbedtls_pk_write_pubkey_der( mbedtls_pk_context *ctx, unsigned char *buf, size_t size );
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719 #if defined(MBEDTLS_PEM_WRITE_C)
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721 * \brief Write a public key to a PEM string
\r
723 * \param ctx PK context which must contain a valid public or private key.
\r
724 * \param buf Buffer to write to. The output includes a
\r
725 * terminating null byte.
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726 * \param size Size of the buffer in bytes.
\r
728 * \return 0 if successful, or a specific error code
\r
730 int mbedtls_pk_write_pubkey_pem( mbedtls_pk_context *ctx, unsigned char *buf, size_t size );
\r
733 * \brief Write a private key to a PKCS#1 or SEC1 PEM string
\r
735 * \param ctx PK context which must contain a valid private key.
\r
736 * \param buf Buffer to write to. The output includes a
\r
737 * terminating null byte.
\r
738 * \param size Size of the buffer in bytes.
\r
740 * \return 0 if successful, or a specific error code
\r
742 int mbedtls_pk_write_key_pem( mbedtls_pk_context *ctx, unsigned char *buf, size_t size );
\r
743 #endif /* MBEDTLS_PEM_WRITE_C */
\r
744 #endif /* MBEDTLS_PK_WRITE_C */
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747 * WARNING: Low-level functions. You probably do not want to use these unless
\r
748 * you are certain you do ;)
\r
751 #if defined(MBEDTLS_PK_PARSE_C)
\r
753 * \brief Parse a SubjectPublicKeyInfo DER structure
\r
755 * \param p the position in the ASN.1 data
\r
756 * \param end end of the buffer
\r
757 * \param pk The PK context to fill. It must have been initialized
\r
760 * \return 0 if successful, or a specific PK error code
\r
762 int mbedtls_pk_parse_subpubkey( unsigned char **p, const unsigned char *end,
\r
763 mbedtls_pk_context *pk );
\r
764 #endif /* MBEDTLS_PK_PARSE_C */
\r
766 #if defined(MBEDTLS_PK_WRITE_C)
\r
768 * \brief Write a subjectPublicKey to ASN.1 data
\r
769 * Note: function works backwards in data buffer
\r
771 * \param p reference to current position pointer
\r
772 * \param start start of the buffer (for bounds-checking)
\r
773 * \param key PK context which must contain a valid public or private key.
\r
775 * \return the length written or a negative error code
\r
777 int mbedtls_pk_write_pubkey( unsigned char **p, unsigned char *start,
\r
778 const mbedtls_pk_context *key );
\r
779 #endif /* MBEDTLS_PK_WRITE_C */
\r
782 * Internal module functions. You probably do not want to use these unless you
\r
785 #if defined(MBEDTLS_FS_IO)
\r
786 int mbedtls_pk_load_file( const char *path, unsigned char **buf, size_t *n );
\r
789 #if defined(MBEDTLS_USE_PSA_CRYPTO)
\r
791 * \brief Turn an EC key into an Opaque one
\r
793 * \warning This is a temporary utility function for tests. It might
\r
794 * change or be removed at any time without notice.
\r
796 * \note Only ECDSA keys are supported so far. Signing with the
\r
797 * specified hash is the only allowed use of that key.
\r
799 * \param pk Input: the EC key to transfer to a PSA key slot.
\r
800 * Output: a PK context wrapping that PSA key slot.
\r
801 * \param slot Output: the chosen slot for storing the key.
\r
802 * It's the caller's responsibility to destroy that slot
\r
803 * after calling mbedtls_pk_free() on the PK context.
\r
804 * \param hash_alg The hash algorithm to allow for use with that key.
\r
806 * \return \c 0 if successful.
\r
807 * \return An Mbed TLS error code otherwise.
\r
809 int mbedtls_pk_wrap_as_opaque( mbedtls_pk_context *pk,
\r
810 psa_key_handle_t *slot,
\r
811 psa_algorithm_t hash_alg );
\r
812 #endif /* MBEDTLS_USE_PSA_CRYPTO */
\r
818 #endif /* MBEDTLS_PK_H */
\r