2 * X.509 Certificate Signing Request (CSR) parsing
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4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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5 * SPDX-License-Identifier: Apache-2.0
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7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
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8 * not use this file except in compliance with the License.
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9 * You may obtain a copy of the License at
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11 * http://www.apache.org/licenses/LICENSE-2.0
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13 * Unless required by applicable law or agreed to in writing, software
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14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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16 * See the License for the specific language governing permissions and
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17 * limitations under the License.
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19 * This file is part of mbed TLS (https://tls.mbed.org)
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22 * The ITU-T X.509 standard defines a certificate format for PKI.
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24 * http://www.ietf.org/rfc/rfc5280.txt (Certificates and CRLs)
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25 * http://www.ietf.org/rfc/rfc3279.txt (Alg IDs for CRLs)
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26 * http://www.ietf.org/rfc/rfc2986.txt (CSRs, aka PKCS#10)
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28 * http://www.itu.int/ITU-T/studygroups/com17/languages/X.680-0207.pdf
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29 * http://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf
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32 #if !defined(MBEDTLS_CONFIG_FILE)
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33 #include "mbedtls/config.h"
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35 #include MBEDTLS_CONFIG_FILE
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38 #if defined(MBEDTLS_X509_CSR_PARSE_C)
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40 #include "mbedtls/x509_csr.h"
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41 #include "mbedtls/oid.h"
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42 #include "mbedtls/platform_util.h"
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46 #if defined(MBEDTLS_PEM_PARSE_C)
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47 #include "mbedtls/pem.h"
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50 #if defined(MBEDTLS_PLATFORM_C)
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51 #include "mbedtls/platform.h"
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55 #define mbedtls_free free
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56 #define mbedtls_calloc calloc
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57 #define mbedtls_snprintf snprintf
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60 #if defined(MBEDTLS_FS_IO) || defined(EFIX64) || defined(EFI32)
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65 * Version ::= INTEGER { v1(0) }
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67 static int x509_csr_get_version( unsigned char **p,
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68 const unsigned char *end,
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73 if( ( ret = mbedtls_asn1_get_int( p, end, ver ) ) != 0 )
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75 if( ret == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
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81 return( MBEDTLS_ERR_X509_INVALID_VERSION + ret );
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88 * Parse a CSR in DER format
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90 int mbedtls_x509_csr_parse_der( mbedtls_x509_csr *csr,
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91 const unsigned char *buf, size_t buflen )
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95 unsigned char *p, *end;
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96 mbedtls_x509_buf sig_params;
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98 memset( &sig_params, 0, sizeof( mbedtls_x509_buf ) );
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101 * Check for valid input
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103 if( csr == NULL || buf == NULL || buflen == 0 )
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104 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
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106 mbedtls_x509_csr_init( csr );
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109 * first copy the raw DER data
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111 p = mbedtls_calloc( 1, len = buflen );
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114 return( MBEDTLS_ERR_X509_ALLOC_FAILED );
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116 memcpy( p, buf, buflen );
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119 csr->raw.len = len;
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123 * CertificationRequest ::= SEQUENCE {
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124 * certificationRequestInfo CertificationRequestInfo,
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125 * signatureAlgorithm AlgorithmIdentifier,
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126 * signature BIT STRING
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129 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
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130 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
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132 mbedtls_x509_csr_free( csr );
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133 return( MBEDTLS_ERR_X509_INVALID_FORMAT );
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136 if( len != (size_t) ( end - p ) )
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138 mbedtls_x509_csr_free( csr );
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139 return( MBEDTLS_ERR_X509_INVALID_FORMAT +
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140 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
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144 * CertificationRequestInfo ::= SEQUENCE {
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148 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
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149 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
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151 mbedtls_x509_csr_free( csr );
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152 return( MBEDTLS_ERR_X509_INVALID_FORMAT + ret );
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156 csr->cri.len = end - csr->cri.p;
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159 * Version ::= INTEGER { v1(0) }
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161 if( ( ret = x509_csr_get_version( &p, end, &csr->version ) ) != 0 )
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163 mbedtls_x509_csr_free( csr );
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167 if( csr->version != 0 )
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169 mbedtls_x509_csr_free( csr );
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170 return( MBEDTLS_ERR_X509_UNKNOWN_VERSION );
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178 csr->subject_raw.p = p;
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180 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
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181 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
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183 mbedtls_x509_csr_free( csr );
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184 return( MBEDTLS_ERR_X509_INVALID_FORMAT + ret );
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187 if( ( ret = mbedtls_x509_get_name( &p, p + len, &csr->subject ) ) != 0 )
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189 mbedtls_x509_csr_free( csr );
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193 csr->subject_raw.len = p - csr->subject_raw.p;
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196 * subjectPKInfo SubjectPublicKeyInfo
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198 if( ( ret = mbedtls_pk_parse_subpubkey( &p, end, &csr->pk ) ) != 0 )
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200 mbedtls_x509_csr_free( csr );
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205 * attributes [0] Attributes
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207 * The list of possible attributes is open-ended, though RFC 2985
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208 * (PKCS#9) defines a few in section 5.4. We currently don't support any,
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209 * so we just ignore them. This is a safe thing to do as the worst thing
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210 * that could happen is that we issue a certificate that does not match
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211 * the requester's expectations - this cannot cause a violation of our
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212 * signature policies.
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214 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
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215 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_CONTEXT_SPECIFIC ) ) != 0 )
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217 mbedtls_x509_csr_free( csr );
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218 return( MBEDTLS_ERR_X509_INVALID_FORMAT + ret );
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223 end = csr->raw.p + csr->raw.len;
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226 * signatureAlgorithm AlgorithmIdentifier,
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227 * signature BIT STRING
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229 if( ( ret = mbedtls_x509_get_alg( &p, end, &csr->sig_oid, &sig_params ) ) != 0 )
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231 mbedtls_x509_csr_free( csr );
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235 if( ( ret = mbedtls_x509_get_sig_alg( &csr->sig_oid, &sig_params,
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236 &csr->sig_md, &csr->sig_pk,
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237 &csr->sig_opts ) ) != 0 )
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239 mbedtls_x509_csr_free( csr );
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240 return( MBEDTLS_ERR_X509_UNKNOWN_SIG_ALG );
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243 if( ( ret = mbedtls_x509_get_sig( &p, end, &csr->sig ) ) != 0 )
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245 mbedtls_x509_csr_free( csr );
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251 mbedtls_x509_csr_free( csr );
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252 return( MBEDTLS_ERR_X509_INVALID_FORMAT +
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253 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
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260 * Parse a CSR, allowing for PEM or raw DER encoding
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262 int mbedtls_x509_csr_parse( mbedtls_x509_csr *csr, const unsigned char *buf, size_t buflen )
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264 #if defined(MBEDTLS_PEM_PARSE_C)
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267 mbedtls_pem_context pem;
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271 * Check for valid input
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273 if( csr == NULL || buf == NULL || buflen == 0 )
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274 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
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276 #if defined(MBEDTLS_PEM_PARSE_C)
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277 /* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
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278 if( buf[buflen - 1] == '\0' )
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280 mbedtls_pem_init( &pem );
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281 ret = mbedtls_pem_read_buffer( &pem,
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282 "-----BEGIN CERTIFICATE REQUEST-----",
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283 "-----END CERTIFICATE REQUEST-----",
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284 buf, NULL, 0, &use_len );
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285 if( ret == MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
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287 ret = mbedtls_pem_read_buffer( &pem,
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288 "-----BEGIN NEW CERTIFICATE REQUEST-----",
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289 "-----END NEW CERTIFICATE REQUEST-----",
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290 buf, NULL, 0, &use_len );
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296 * Was PEM encoded, parse the result
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298 ret = mbedtls_x509_csr_parse_der( csr, pem.buf, pem.buflen );
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301 mbedtls_pem_free( &pem );
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302 if( ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
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305 #endif /* MBEDTLS_PEM_PARSE_C */
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306 return( mbedtls_x509_csr_parse_der( csr, buf, buflen ) );
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309 #if defined(MBEDTLS_FS_IO)
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311 * Load a CSR into the structure
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313 int mbedtls_x509_csr_parse_file( mbedtls_x509_csr *csr, const char *path )
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317 unsigned char *buf;
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319 if( ( ret = mbedtls_pk_load_file( path, &buf, &n ) ) != 0 )
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322 ret = mbedtls_x509_csr_parse( csr, buf, n );
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324 mbedtls_platform_zeroize( buf, n );
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325 mbedtls_free( buf );
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329 #endif /* MBEDTLS_FS_IO */
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331 #define BEFORE_COLON 14
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334 * Return an informational string about the CSR.
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336 int mbedtls_x509_csr_info( char *buf, size_t size, const char *prefix,
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337 const mbedtls_x509_csr *csr )
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342 char key_size_str[BEFORE_COLON];
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347 ret = mbedtls_snprintf( p, n, "%sCSR version : %d",
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348 prefix, csr->version );
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349 MBEDTLS_X509_SAFE_SNPRINTF;
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351 ret = mbedtls_snprintf( p, n, "\n%ssubject name : ", prefix );
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352 MBEDTLS_X509_SAFE_SNPRINTF;
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353 ret = mbedtls_x509_dn_gets( p, n, &csr->subject );
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354 MBEDTLS_X509_SAFE_SNPRINTF;
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356 ret = mbedtls_snprintf( p, n, "\n%ssigned using : ", prefix );
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357 MBEDTLS_X509_SAFE_SNPRINTF;
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359 ret = mbedtls_x509_sig_alg_gets( p, n, &csr->sig_oid, csr->sig_pk, csr->sig_md,
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361 MBEDTLS_X509_SAFE_SNPRINTF;
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363 if( ( ret = mbedtls_x509_key_size_helper( key_size_str, BEFORE_COLON,
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364 mbedtls_pk_get_name( &csr->pk ) ) ) != 0 )
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369 ret = mbedtls_snprintf( p, n, "\n%s%-" BC "s: %d bits\n", prefix, key_size_str,
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370 (int) mbedtls_pk_get_bitlen( &csr->pk ) );
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371 MBEDTLS_X509_SAFE_SNPRINTF;
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373 return( (int) ( size - n ) );
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379 void mbedtls_x509_csr_init( mbedtls_x509_csr *csr )
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381 memset( csr, 0, sizeof(mbedtls_x509_csr) );
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385 * Unallocate all CSR data
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387 void mbedtls_x509_csr_free( mbedtls_x509_csr *csr )
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389 mbedtls_x509_name *name_cur;
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390 mbedtls_x509_name *name_prv;
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395 mbedtls_pk_free( &csr->pk );
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397 #if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT)
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398 mbedtls_free( csr->sig_opts );
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401 name_cur = csr->subject.next;
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402 while( name_cur != NULL )
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404 name_prv = name_cur;
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405 name_cur = name_cur->next;
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406 mbedtls_platform_zeroize( name_prv, sizeof( mbedtls_x509_name ) );
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407 mbedtls_free( name_prv );
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410 if( csr->raw.p != NULL )
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412 mbedtls_platform_zeroize( csr->raw.p, csr->raw.len );
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413 mbedtls_free( csr->raw.p );
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416 mbedtls_platform_zeroize( csr, sizeof( mbedtls_x509_csr ) );
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419 #endif /* MBEDTLS_X509_CSR_PARSE_C */
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