1 /* $OpenBSD: m_sigver.c,v 1.21 2024/03/27 01:55:40 joshua Exp $ */ 2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL 3 * project 2006. 4 */ 5 /* ==================================================================== 6 * Copyright (c) 2006,2007 The OpenSSL Project. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in 17 * the documentation and/or other materials provided with the 18 * distribution. 19 * 20 * 3. All advertising materials mentioning features or use of this 21 * software must display the following acknowledgment: 22 * "This product includes software developed by the OpenSSL Project 23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 24 * 25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 26 * endorse or promote products derived from this software without 27 * prior written permission. For written permission, please contact 28 * licensing@OpenSSL.org. 29 * 30 * 5. Products derived from this software may not be called "OpenSSL" 31 * nor may "OpenSSL" appear in their names without prior written 32 * permission of the OpenSSL Project. 33 * 34 * 6. Redistributions of any form whatsoever must retain the following 35 * acknowledgment: 36 * "This product includes software developed by the OpenSSL Project 37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 38 * 39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 50 * OF THE POSSIBILITY OF SUCH DAMAGE. 51 * ==================================================================== 52 * 53 * This product includes cryptographic software written by Eric Young 54 * (eay@cryptsoft.com). This product includes software written by Tim 55 * Hudson (tjh@cryptsoft.com). 56 * 57 */ 58 59 #include <stdio.h> 60 61 #include <openssl/err.h> 62 #include <openssl/evp.h> 63 #include <openssl/objects.h> 64 #include <openssl/x509.h> 65 66 #include "evp_local.h" 67 68 static int 69 update_oneshot_only(EVP_MD_CTX *ctx, const void *data, size_t datalen) 70 { 71 EVPerror(EVP_R_ONLY_ONESHOT_SUPPORTED); 72 return 0; 73 } 74 75 static int 76 do_sigver_init(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, const EVP_MD *type, 77 EVP_PKEY *pkey, int ver) 78 { 79 if (ctx->pctx == NULL) 80 ctx->pctx = EVP_PKEY_CTX_new(pkey, NULL); 81 if (ctx->pctx == NULL) 82 return 0; 83 84 if (!(ctx->pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM)) { 85 if (type == NULL) { 86 int def_nid; 87 if (EVP_PKEY_get_default_digest_nid(pkey, &def_nid) > 0) 88 type = EVP_get_digestbynid(def_nid); 89 } 90 91 if (type == NULL) { 92 EVPerror(EVP_R_NO_DEFAULT_DIGEST); 93 return 0; 94 } 95 } 96 97 if (ver) { 98 if (ctx->pctx->pmeth->digestverify != NULL) { 99 ctx->pctx->operation = EVP_PKEY_OP_VERIFY; 100 ctx->update = update_oneshot_only; 101 } else if (EVP_PKEY_verify_init(ctx->pctx) <= 0) 102 return 0; 103 } else { 104 if (ctx->pctx->pmeth->signctx_init) { 105 if (ctx->pctx->pmeth->signctx_init(ctx->pctx, ctx) <= 0) 106 return 0; 107 ctx->pctx->operation = EVP_PKEY_OP_SIGNCTX; 108 } else if (ctx->pctx->pmeth->digestsign != NULL) { 109 ctx->pctx->operation = EVP_PKEY_OP_SIGN; 110 ctx->update = update_oneshot_only; 111 } else if (EVP_PKEY_sign_init(ctx->pctx) <= 0) 112 return 0; 113 } 114 if (EVP_PKEY_CTX_set_signature_md(ctx->pctx, type) <= 0) 115 return 0; 116 if (pctx) 117 *pctx = ctx->pctx; 118 if (ctx->pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM) 119 return 1; 120 if (!EVP_DigestInit_ex(ctx, type, NULL)) 121 return 0; 122 return 1; 123 } 124 125 int 126 EVP_DigestSignInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, const EVP_MD *type, 127 ENGINE *e, EVP_PKEY *pkey) 128 { 129 return do_sigver_init(ctx, pctx, type, pkey, 0); 130 } 131 132 int 133 EVP_DigestVerifyInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, const EVP_MD *type, 134 ENGINE *e, EVP_PKEY *pkey) 135 { 136 return do_sigver_init(ctx, pctx, type, pkey, 1); 137 } 138 139 static int 140 evp_digestsignfinal_sigctx_custom(EVP_MD_CTX *ctx, unsigned char *sigret, 141 size_t *siglen) 142 { 143 EVP_PKEY_CTX *pctx = ctx->pctx; 144 EVP_PKEY_CTX *dctx = NULL; 145 int ret = 0; 146 147 if (sigret == NULL) 148 return pctx->pmeth->signctx(pctx, sigret, siglen, ctx); 149 150 /* XXX - support EVP_MD_CTX_FLAG_FINALISE? */ 151 if ((dctx = EVP_PKEY_CTX_dup(pctx)) == NULL) 152 goto err; 153 154 if (!dctx->pmeth->signctx(dctx, sigret, siglen, ctx)) 155 goto err; 156 157 ret = 1; 158 159 err: 160 EVP_PKEY_CTX_free(dctx); 161 162 return ret; 163 } 164 165 int 166 EVP_DigestSignFinal(EVP_MD_CTX *ctx, unsigned char *sigret, size_t *siglen) 167 { 168 EVP_PKEY_CTX *pctx = ctx->pctx; 169 EVP_MD_CTX *md_ctx = NULL; 170 unsigned char md[EVP_MAX_MD_SIZE]; 171 unsigned int mdlen = 0; 172 int s; 173 int ret = 0; 174 175 if (pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM) 176 return evp_digestsignfinal_sigctx_custom(ctx, sigret, siglen); 177 178 if (sigret == NULL) { 179 if (ctx->pctx->pmeth->signctx != NULL) { 180 if (ctx->pctx->pmeth->signctx(ctx->pctx, NULL, 181 siglen, ctx) <= 0) 182 return 0; 183 return 1; 184 } 185 186 if ((s = EVP_MD_size(ctx->digest)) < 0) 187 return 0; 188 if (EVP_PKEY_sign(ctx->pctx, NULL, siglen, NULL, s) <= 0) 189 return 0; 190 191 return 1; 192 } 193 194 195 if ((md_ctx = EVP_MD_CTX_new()) == NULL) 196 goto err; 197 if (!EVP_MD_CTX_copy_ex(md_ctx, ctx)) 198 goto err; 199 if (md_ctx->pctx->pmeth->signctx != NULL) { 200 if(md_ctx->pctx->pmeth->signctx(md_ctx->pctx, 201 sigret, siglen, md_ctx) <= 0) 202 goto err; 203 } 204 if (!EVP_DigestFinal_ex(md_ctx, md, &mdlen)) 205 goto err; 206 if (EVP_PKEY_sign(ctx->pctx, sigret, siglen, md, mdlen) <= 0) 207 goto err; 208 209 ret = 1; 210 211 err: 212 EVP_MD_CTX_free(md_ctx); 213 214 return ret; 215 } 216 217 int 218 EVP_DigestSign(EVP_MD_CTX *ctx, unsigned char *sigret, size_t *siglen, 219 const unsigned char *tbs, size_t tbslen) 220 { 221 if (ctx->pctx->pmeth->digestsign != NULL) 222 return ctx->pctx->pmeth->digestsign(ctx, sigret, siglen, 223 tbs, tbslen); 224 225 if (sigret != NULL) { 226 if (EVP_DigestSignUpdate(ctx, tbs, tbslen) <= 0) 227 return 0; 228 } 229 230 return EVP_DigestSignFinal(ctx, sigret, siglen); 231 } 232 233 int 234 EVP_DigestVerifyFinal(EVP_MD_CTX *ctx, const unsigned char *sig, size_t siglen) 235 { 236 EVP_MD_CTX tmp_ctx; 237 unsigned char md[EVP_MAX_MD_SIZE]; 238 int r; 239 unsigned int mdlen = 0; 240 241 EVP_MD_CTX_legacy_clear(&tmp_ctx); 242 if (!EVP_MD_CTX_copy_ex(&tmp_ctx, ctx)) 243 return -1; 244 r = EVP_DigestFinal_ex(&tmp_ctx, md, &mdlen); 245 EVP_MD_CTX_cleanup(&tmp_ctx); 246 if (!r) 247 return r; 248 return EVP_PKEY_verify(ctx->pctx, sig, siglen, md, mdlen); 249 } 250 251 int 252 EVP_DigestVerify(EVP_MD_CTX *ctx, const unsigned char *sigret, size_t siglen, 253 const unsigned char *tbs, size_t tbslen) 254 { 255 if (ctx->pctx->pmeth->digestverify != NULL) 256 return ctx->pctx->pmeth->digestverify(ctx, sigret, siglen, 257 tbs, tbslen); 258 259 if (EVP_DigestVerifyUpdate(ctx, tbs, tbslen) <= 0) 260 return -1; 261 262 return EVP_DigestVerifyFinal(ctx, sigret, siglen); 263 } 264