4 * \brief This file contains CMAC definitions and functions.
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6 * The Cipher-based Message Authentication Code (CMAC) Mode for
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7 * Authentication is defined in <em>RFC-4493: The AES-CMAC Algorithm</em>.
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10 * Copyright (C) 2015-2018, Arm Limited (or its affiliates), All Rights Reserved
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11 * SPDX-License-Identifier: Apache-2.0
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13 * Licensed under the Apache License, Version 2.0 (the "License"); you may
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14 * not use this file except in compliance with the License.
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15 * You may obtain a copy of the License at
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17 * http://www.apache.org/licenses/LICENSE-2.0
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19 * Unless required by applicable law or agreed to in writing, software
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20 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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21 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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22 * See the License for the specific language governing permissions and
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23 * limitations under the License.
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25 * This file is part of Mbed TLS (https://tls.mbed.org)
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28 #ifndef MBEDTLS_CMAC_H
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29 #define MBEDTLS_CMAC_H
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31 #if !defined(MBEDTLS_CONFIG_FILE)
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34 #include MBEDTLS_CONFIG_FILE
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43 /* MBEDTLS_ERR_CMAC_HW_ACCEL_FAILED is deprecated and should not be used. */
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44 #define MBEDTLS_ERR_CMAC_HW_ACCEL_FAILED -0x007A /**< CMAC hardware accelerator failed. */
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46 #define MBEDTLS_AES_BLOCK_SIZE 16
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47 #define MBEDTLS_DES3_BLOCK_SIZE 8
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49 #if defined(MBEDTLS_AES_C)
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50 #define MBEDTLS_CIPHER_BLKSIZE_MAX 16 /**< The longest block used by CMAC is that of AES. */
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52 #define MBEDTLS_CIPHER_BLKSIZE_MAX 8 /**< The longest block used by CMAC is that of 3DES. */
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55 #if !defined(MBEDTLS_CMAC_ALT)
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58 * The CMAC context structure.
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60 struct mbedtls_cmac_context_t
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62 /** The internal state of the CMAC algorithm. */
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63 unsigned char state[MBEDTLS_CIPHER_BLKSIZE_MAX];
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65 /** Unprocessed data - either data that was not block aligned and is still
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66 * pending processing, or the final block. */
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67 unsigned char unprocessed_block[MBEDTLS_CIPHER_BLKSIZE_MAX];
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69 /** The length of data pending processing. */
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70 size_t unprocessed_len;
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73 #else /* !MBEDTLS_CMAC_ALT */
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74 #include "cmac_alt.h"
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75 #endif /* !MBEDTLS_CMAC_ALT */
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78 * \brief This function sets the CMAC key, and prepares to authenticate
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80 * Must be called with an initialized cipher context.
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82 * \param ctx The cipher context used for the CMAC operation, initialized
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83 * as one of the following types: MBEDTLS_CIPHER_AES_128_ECB,
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84 * MBEDTLS_CIPHER_AES_192_ECB, MBEDTLS_CIPHER_AES_256_ECB,
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85 * or MBEDTLS_CIPHER_DES_EDE3_ECB.
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86 * \param key The CMAC key.
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87 * \param keybits The length of the CMAC key in bits.
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88 * Must be supported by the cipher.
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90 * \return \c 0 on success.
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91 * \return A cipher-specific error code on failure.
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93 int mbedtls_cipher_cmac_starts( mbedtls_cipher_context_t *ctx,
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94 const unsigned char *key, size_t keybits );
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97 * \brief This function feeds an input buffer into an ongoing CMAC
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100 * It is called between mbedtls_cipher_cmac_starts() or
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101 * mbedtls_cipher_cmac_reset(), and mbedtls_cipher_cmac_finish().
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102 * Can be called repeatedly.
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104 * \param ctx The cipher context used for the CMAC operation.
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105 * \param input The buffer holding the input data.
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106 * \param ilen The length of the input data.
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108 * \return \c 0 on success.
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109 * \return #MBEDTLS_ERR_MD_BAD_INPUT_DATA
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110 * if parameter verification fails.
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112 int mbedtls_cipher_cmac_update( mbedtls_cipher_context_t *ctx,
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113 const unsigned char *input, size_t ilen );
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116 * \brief This function finishes the CMAC operation, and writes
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117 * the result to the output buffer.
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119 * It is called after mbedtls_cipher_cmac_update().
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120 * It can be followed by mbedtls_cipher_cmac_reset() and
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121 * mbedtls_cipher_cmac_update(), or mbedtls_cipher_free().
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123 * \param ctx The cipher context used for the CMAC operation.
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124 * \param output The output buffer for the CMAC checksum result.
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126 * \return \c 0 on success.
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127 * \return #MBEDTLS_ERR_MD_BAD_INPUT_DATA
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128 * if parameter verification fails.
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130 int mbedtls_cipher_cmac_finish( mbedtls_cipher_context_t *ctx,
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131 unsigned char *output );
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134 * \brief This function prepares the authentication of another
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135 * message with the same key as the previous CMAC
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138 * It is called after mbedtls_cipher_cmac_finish()
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139 * and before mbedtls_cipher_cmac_update().
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141 * \param ctx The cipher context used for the CMAC operation.
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143 * \return \c 0 on success.
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144 * \return #MBEDTLS_ERR_MD_BAD_INPUT_DATA
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145 * if parameter verification fails.
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147 int mbedtls_cipher_cmac_reset( mbedtls_cipher_context_t *ctx );
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150 * \brief This function calculates the full generic CMAC
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151 * on the input buffer with the provided key.
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153 * The function allocates the context, performs the
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154 * calculation, and frees the context.
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156 * The CMAC result is calculated as
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157 * output = generic CMAC(cmac key, input buffer).
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160 * \param cipher_info The cipher information.
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161 * \param key The CMAC key.
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162 * \param keylen The length of the CMAC key in bits.
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163 * \param input The buffer holding the input data.
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164 * \param ilen The length of the input data.
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165 * \param output The buffer for the generic CMAC result.
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167 * \return \c 0 on success.
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168 * \return #MBEDTLS_ERR_MD_BAD_INPUT_DATA
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169 * if parameter verification fails.
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171 int mbedtls_cipher_cmac( const mbedtls_cipher_info_t *cipher_info,
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172 const unsigned char *key, size_t keylen,
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173 const unsigned char *input, size_t ilen,
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174 unsigned char *output );
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176 #if defined(MBEDTLS_AES_C)
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178 * \brief This function implements the AES-CMAC-PRF-128 pseudorandom
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179 * function, as defined in
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180 * <em>RFC-4615: The Advanced Encryption Standard-Cipher-based
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181 * Message Authentication Code-Pseudo-Random Function-128
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182 * (AES-CMAC-PRF-128) Algorithm for the Internet Key
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183 * Exchange Protocol (IKE).</em>
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185 * \param key The key to use.
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186 * \param key_len The key length in Bytes.
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187 * \param input The buffer holding the input data.
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188 * \param in_len The length of the input data in Bytes.
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189 * \param output The buffer holding the generated 16 Bytes of
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190 * pseudorandom output.
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192 * \return \c 0 on success.
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194 int mbedtls_aes_cmac_prf_128( const unsigned char *key, size_t key_len,
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195 const unsigned char *input, size_t in_len,
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196 unsigned char output[16] );
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197 #endif /* MBEDTLS_AES_C */
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199 #if defined(MBEDTLS_SELF_TEST) && ( defined(MBEDTLS_AES_C) || defined(MBEDTLS_DES_C) )
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201 * \brief The CMAC checkup routine.
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203 * \return \c 0 on success.
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204 * \return \c 1 on failure.
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206 int mbedtls_cmac_self_test( int verbose );
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207 #endif /* MBEDTLS_SELF_TEST && ( MBEDTLS_AES_C || MBEDTLS_DES_C ) */
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213 #endif /* MBEDTLS_CMAC_H */
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