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 { 142 if (i == 0) 143 a=algor1; 144 else 145 a=algor2; 146 if (a == NULL) continue; 147 if (type->pkey_type == NID_dsaWithSHA1) 148 { 149 /* special case: RFC 2459 tells us to omit 'parameters' 150 * with id-dsa-with-sha1 */ 151 ASN1_TYPE_free(a->parameter); 152 a->parameter = NULL; 153 } 154 else if ((a->parameter == NULL) || 155 (a->parameter->type != V_ASN1_NULL)) 156 { 157 ASN1_TYPE_free(a->parameter); 158 if ((a->parameter=ASN1_TYPE_new()) == NULL) 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 { 165 ASN1err(ASN1_F_ASN1_SIGN,ASN1_R_UNKNOWN_OBJECT_TYPE); 166 goto err; 167 } 168 if (a->algorithm->length == 0) 169 { 170 ASN1err(ASN1_F_ASN1_SIGN,ASN1_R_THE_ASN1_OBJECT_IDENTIFIER_IS_NOT_KNOWN_FOR_THIS_MD); 171 goto err; 172 } 173 } 174 inl=i2d(data,NULL); 175 buf_in=(unsigned char *)OPENSSL_malloc((unsigned int)inl); 176 outll=outl=EVP_PKEY_size(pkey); 177 buf_out=(unsigned char *)OPENSSL_malloc((unsigned int)outl); 178 if ((buf_in == NULL) || (buf_out == NULL)) 179 { 180 outl=0; 181 ASN1err(ASN1_F_ASN1_SIGN,ERR_R_MALLOC_FAILURE); 182 goto err; 183 } 184 p=buf_in; 185 186 i2d(data,&p); 187 if (!EVP_SignInit_ex(&ctx,type, NULL) 188 || !EVP_SignUpdate(&ctx,(unsigned char *)buf_in,inl) 189 || !EVP_SignFinal(&ctx,(unsigned char *)buf_out, 190 (unsigned int *)&outl,pkey)) 191 { 192 outl=0; 193 ASN1err(ASN1_F_ASN1_SIGN,ERR_R_EVP_LIB); 194 goto err; 195 } 196 if (signature->data != NULL) OPENSSL_free(signature->data); 197 signature->data=buf_out; 198 buf_out=NULL; 199 signature->length=outl; 200 /* In the interests of compatibility, I'll make sure that 201 * the bit string has a 'not-used bits' value of 0 202 */ 203 signature->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07); 204 signature->flags|=ASN1_STRING_FLAG_BITS_LEFT; 205err: 206 EVP_MD_CTX_cleanup(&ctx); 207 if (buf_in != NULL) 208 { OPENSSL_cleanse((char *)buf_in,(unsigned int)inl); OPENSSL_free(buf_in); } 209 if (buf_out != NULL) 210 { OPENSSL_cleanse((char *)buf_out,outll); OPENSSL_free(buf_out); } 211 return(outl); 212 } 213 214#endif 215 216int ASN1_item_sign(const ASN1_ITEM *it, X509_ALGOR *algor1, X509_ALGOR *algor2, 217 ASN1_BIT_STRING *signature, void *asn, EVP_PKEY *pkey, 218 const EVP_MD *type) 219 { 220 EVP_MD_CTX ctx; 221 EVP_MD_CTX_init(&ctx); 222 if (!EVP_DigestSignInit(&ctx, NULL, type, NULL, pkey)) 223 { 224 EVP_MD_CTX_cleanup(&ctx); 225 return 0; 226 } 227 return ASN1_item_sign_ctx(it, algor1, algor2, signature, asn, &ctx); 228 } 229 230 231int ASN1_item_sign_ctx(const ASN1_ITEM *it, 232 X509_ALGOR *algor1, X509_ALGOR *algor2, 233 ASN1_BIT_STRING *signature, void *asn, EVP_MD_CTX *ctx) 234 { 235 const EVP_MD *type; 236 EVP_PKEY *pkey; 237 unsigned char *buf_in=NULL,*buf_out=NULL; 238 size_t inl=0,outl=0,outll=0; 239 int signid, paramtype; 240 int rv; 241 242 type = EVP_MD_CTX_md(ctx); 243 pkey = EVP_PKEY_CTX_get0_pkey(ctx->pctx); 244 245 if (!type || !pkey) 246 { 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 { 253 rv = pkey->ameth->item_sign(ctx, it, asn, algor1, algor2, 254 signature); 255 if (rv == 1) 256 outl = signature->length; 257 /* Return value meanings: 258 * <=0: error. 259 * 1: method does everything. 260 * 2: carry on as normal. 261 * 3: ASN1 method sets algorithm identifiers: just sign. 262 */ 263 if (rv <= 0) 264 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_EVP_LIB); 265 if (rv <= 1) 266 goto err; 267 } 268 else 269 rv = 2; 270 271 if (rv == 2) 272 { 273 if (type->flags & EVP_MD_FLAG_PKEY_METHOD_SIGNATURE) 274 { 275 if (!pkey->ameth || 276 !OBJ_find_sigid_by_algs(&signid, 277 EVP_MD_nid(type), 278 pkey->ameth->pkey_id)) 279 { 280 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, 281 ASN1_R_DIGEST_AND_KEY_TYPE_NOT_SUPPORTED); 282 return 0; 283 } 284 } 285 else 286 signid = type->pkey_type; 287 288 if (pkey->ameth->pkey_flags & ASN1_PKEY_SIGPARAM_NULL) 289 paramtype = V_ASN1_NULL; 290 else 291 paramtype = V_ASN1_UNDEF; 292 293 if (algor1) 294 X509_ALGOR_set0(algor1, OBJ_nid2obj(signid), paramtype, NULL); 295 if (algor2) 296 X509_ALGOR_set0(algor2, OBJ_nid2obj(signid), paramtype, NULL); 297 298 } 299 300 inl=ASN1_item_i2d(asn,&buf_in, it); 301 outll=outl=EVP_PKEY_size(pkey); 302 buf_out=OPENSSL_malloc((unsigned int)outl); 303 if ((buf_in == NULL) || (buf_out == NULL)) 304 { 305 outl=0; 306 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX,ERR_R_MALLOC_FAILURE); 307 goto err; 308 } 309 310 if (!EVP_DigestSignUpdate(ctx, buf_in, inl) 311 || !EVP_DigestSignFinal(ctx, buf_out, &outl)) 312 { 313 outl=0; 314 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX,ERR_R_EVP_LIB); 315 goto err; 316 } 317 if (signature->data != NULL) OPENSSL_free(signature->data); 318 signature->data=buf_out; 319 buf_out=NULL; 320 signature->length=outl; 321 /* In the interests of compatibility, I'll make sure that 322 * the bit string has a 'not-used bits' value of 0 323 */ 324 signature->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07); 325 signature->flags|=ASN1_STRING_FLAG_BITS_LEFT; 326err: 327 EVP_MD_CTX_cleanup(ctx); 328 if (buf_in != NULL) 329 { OPENSSL_cleanse((char *)buf_in,(unsigned int)inl); OPENSSL_free(buf_in); } 330 if (buf_out != NULL) 331 { OPENSSL_cleanse((char *)buf_out,outll); OPENSSL_free(buf_out); } 332 return(outl); 333 } 334