1/* crypto/asn1/a_sign.c */ 2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay@cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58/* ==================================================================== 59 * Copyright (c) 1998-2003 The OpenSSL Project. All rights reserved. 60 * 61 * Redistribution and use in source and binary forms, with or without 62 * modification, are permitted provided that the following conditions 63 * are met: 64 * 65 * 1. Redistributions of source code must retain the above copyright 66 * notice, this list of conditions and the following disclaimer. 67 * 68 * 2. Redistributions in binary form must reproduce the above copyright 69 * notice, this list of conditions and the following disclaimer in 70 * the documentation and/or other materials provided with the 71 * distribution. 72 * 73 * 3. All advertising materials mentioning features or use of this 74 * software must display the following acknowledgment: 75 * "This product includes software developed by the OpenSSL Project 76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 77 * 78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 79 * endorse or promote products derived from this software without 80 * prior written permission. For written permission, please contact 81 * openssl-core@openssl.org. 82 * 83 * 5. Products derived from this software may not be called "OpenSSL" 84 * nor may "OpenSSL" appear in their names without prior written 85 * permission of the OpenSSL Project. 86 * 87 * 6. Redistributions of any form whatsoever must retain the following 88 * acknowledgment: 89 * "This product includes software developed by the OpenSSL Project 90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)" 91 * 92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 103 * OF THE POSSIBILITY OF SUCH DAMAGE. 104 * ==================================================================== 105 * 106 * This product includes cryptographic software written by Eric Young 107 * (eay@cryptsoft.com). This product includes software written by Tim 108 * Hudson (tjh@cryptsoft.com). 109 * 110 */ 111 112#include <stdio.h> 113#include <time.h> 114 115#include "cryptlib.h" 116 117#ifndef NO_SYS_TYPES_H 118# include <sys/types.h> 119#endif 120 121#include <openssl/bn.h> 122#include <openssl/evp.h> 123#include <openssl/x509.h> 124#include <openssl/objects.h> 125#include <openssl/buffer.h> 126#include "asn1_locl.h" 127 128#ifndef NO_ASN1_OLD 129 130int ASN1_sign(i2d_of_void *i2d, X509_ALGOR *algor1, X509_ALGOR *algor2, 131 ASN1_BIT_STRING *signature, char *data, EVP_PKEY *pkey, 132 const EVP_MD *type) 133{ 134 EVP_MD_CTX ctx; 135 unsigned char *p, *buf_in = NULL, *buf_out = NULL; 136 int i, inl = 0, outl = 0, outll = 0; 137 X509_ALGOR *a; 138 139 EVP_MD_CTX_init(&ctx); 140 for (i = 0; i < 2; i++) { 141 if (i == 0) 142 a = algor1; 143 else 144 a = algor2; 145 if (a == NULL) 146 continue; 147 if (type->pkey_type == NID_dsaWithSHA1) { 148 /* 149 * special case: RFC 2459 tells us to omit 'parameters' with 150 * id-dsa-with-sha1 151 */ 152 ASN1_TYPE_free(a->parameter); 153 a->parameter = NULL; 154 } else if ((a->parameter == NULL) || 155 (a->parameter->type != V_ASN1_NULL)) { 156 ASN1_TYPE_free(a->parameter); 157 if ((a->parameter = ASN1_TYPE_new()) == NULL) 158 goto err; 159 a->parameter->type = V_ASN1_NULL; 160 } 161 ASN1_OBJECT_free(a->algorithm); 162 a->algorithm = OBJ_nid2obj(type->pkey_type); 163 if (a->algorithm == NULL) { 164 ASN1err(ASN1_F_ASN1_SIGN, ASN1_R_UNKNOWN_OBJECT_TYPE); 165 goto err; 166 } 167 if (a->algorithm->length == 0) { 168 ASN1err(ASN1_F_ASN1_SIGN, 169 ASN1_R_THE_ASN1_OBJECT_IDENTIFIER_IS_NOT_KNOWN_FOR_THIS_MD); 170 goto err; 171 } 172 } 173 inl = i2d(data, NULL); 174 buf_in = (unsigned char *)OPENSSL_malloc((unsigned int)inl); 175 outll = outl = EVP_PKEY_size(pkey); 176 buf_out = (unsigned char *)OPENSSL_malloc((unsigned int)outl); 177 if ((buf_in == NULL) || (buf_out == NULL)) { 178 outl = 0; 179 ASN1err(ASN1_F_ASN1_SIGN, ERR_R_MALLOC_FAILURE); 180 goto err; 181 } 182 p = buf_in; 183 184 i2d(data, &p); 185 if (!EVP_SignInit_ex(&ctx, type, NULL) 186 || !EVP_SignUpdate(&ctx, (unsigned char *)buf_in, inl) 187 || !EVP_SignFinal(&ctx, (unsigned char *)buf_out, 188 (unsigned int *)&outl, pkey)) { 189 outl = 0; 190 ASN1err(ASN1_F_ASN1_SIGN, ERR_R_EVP_LIB); 191 goto err; 192 } 193 if (signature->data != NULL) 194 OPENSSL_free(signature->data); 195 signature->data = buf_out; 196 buf_out = NULL; 197 signature->length = outl; 198 /* 199 * In the interests of compatibility, I'll make sure that the bit string 200 * has a 'not-used bits' value of 0 201 */ 202 signature->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07); 203 signature->flags |= ASN1_STRING_FLAG_BITS_LEFT; 204 err: 205 EVP_MD_CTX_cleanup(&ctx); 206 if (buf_in != NULL) { 207 OPENSSL_cleanse((char *)buf_in, (unsigned int)inl); 208 OPENSSL_free(buf_in); 209 } 210 if (buf_out != NULL) { 211 OPENSSL_cleanse((char *)buf_out, outll); 212 OPENSSL_free(buf_out); 213 } 214 return (outl); 215} 216 217#endif 218 219int ASN1_item_sign(const ASN1_ITEM *it, X509_ALGOR *algor1, 220 X509_ALGOR *algor2, ASN1_BIT_STRING *signature, void *asn, 221 EVP_PKEY *pkey, const EVP_MD *type) 222{ 223 EVP_MD_CTX ctx; 224 EVP_MD_CTX_init(&ctx); 225 if (!EVP_DigestSignInit(&ctx, NULL, type, NULL, pkey)) { 226 EVP_MD_CTX_cleanup(&ctx); 227 return 0; 228 } 229 return ASN1_item_sign_ctx(it, algor1, algor2, signature, asn, &ctx); 230} 231 232int ASN1_item_sign_ctx(const ASN1_ITEM *it, 233 X509_ALGOR *algor1, X509_ALGOR *algor2, 234 ASN1_BIT_STRING *signature, void *asn, EVP_MD_CTX *ctx) 235{ 236 const EVP_MD *type; 237 EVP_PKEY *pkey; 238 unsigned char *buf_in = NULL, *buf_out = NULL; 239 size_t inl = 0, outl = 0, outll = 0; 240 int signid, paramtype; 241 int rv; 242 243 type = EVP_MD_CTX_md(ctx); 244 pkey = EVP_PKEY_CTX_get0_pkey(ctx->pctx); 245 246 if (!type || !pkey) { 247 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ASN1_R_CONTEXT_NOT_INITIALISED); 248 return 0; 249 } 250 251 if (pkey->ameth->item_sign) { 252 rv = pkey->ameth->item_sign(ctx, it, asn, algor1, algor2, signature); 253 if (rv == 1) 254 outl = signature->length; 255 /*- 256 * Return value meanings: 257 * <=0: error. 258 * 1: method does everything. 259 * 2: carry on as normal. 260 * 3: ASN1 method sets algorithm identifiers: just sign. 261 */ 262 if (rv <= 0) 263 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_EVP_LIB); 264 if (rv <= 1) 265 goto err; 266 } else 267 rv = 2; 268 269 if (rv == 2) { 270 if (type->flags & EVP_MD_FLAG_PKEY_METHOD_SIGNATURE) { 271 if (!pkey->ameth || 272 !OBJ_find_sigid_by_algs(&signid, 273 EVP_MD_nid(type), 274 pkey->ameth->pkey_id)) { 275 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, 276 ASN1_R_DIGEST_AND_KEY_TYPE_NOT_SUPPORTED); 277 return 0; 278 } 279 } else 280 signid = type->pkey_type; 281 282 if (pkey->ameth->pkey_flags & ASN1_PKEY_SIGPARAM_NULL) 283 paramtype = V_ASN1_NULL; 284 else 285 paramtype = V_ASN1_UNDEF; 286 287 if (algor1) 288 X509_ALGOR_set0(algor1, OBJ_nid2obj(signid), paramtype, NULL); 289 if (algor2) 290 X509_ALGOR_set0(algor2, OBJ_nid2obj(signid), paramtype, NULL); 291 292 } 293 294 inl = ASN1_item_i2d(asn, &buf_in, it); 295 outll = outl = EVP_PKEY_size(pkey); 296 buf_out = OPENSSL_malloc((unsigned int)outl); 297 if ((buf_in == NULL) || (buf_out == NULL)) { 298 outl = 0; 299 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_MALLOC_FAILURE); 300 goto err; 301 } 302 303 if (!EVP_DigestSignUpdate(ctx, buf_in, inl) 304 || !EVP_DigestSignFinal(ctx, buf_out, &outl)) { 305 outl = 0; 306 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_EVP_LIB); 307 goto err; 308 } 309 if (signature->data != NULL) 310 OPENSSL_free(signature->data); 311 signature->data = buf_out; 312 buf_out = NULL; 313 signature->length = outl; 314 /* 315 * In the interests of compatibility, I'll make sure that the bit string 316 * has a 'not-used bits' value of 0 317 */ 318 signature->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07); 319 signature->flags |= ASN1_STRING_FLAG_BITS_LEFT; 320 err: 321 EVP_MD_CTX_cleanup(ctx); 322 if (buf_in != NULL) { 323 OPENSSL_cleanse((char *)buf_in, (unsigned int)inl); 324 OPENSSL_free(buf_in); 325 } 326 if (buf_out != NULL) { 327 OPENSSL_cleanse((char *)buf_out, outll); 328 OPENSSL_free(buf_out); 329 } 330 return (outl); 331} 332