1 /* Written by Dr Stephen N Henson (steve (at) openssl.org) for the OpenSSL 2 * project 2006. 3 */ 4 /* ==================================================================== 5 * Copyright (c) 2006,2007 The OpenSSL Project. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in 16 * the documentation and/or other materials provided with the 17 * distribution. 18 * 19 * 3. All advertising materials mentioning features or use of this 20 * software must display the following acknowledgment: 21 * "This product includes software developed by the OpenSSL Project 22 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 23 * 24 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 25 * endorse or promote products derived from this software without 26 * prior written permission. For written permission, please contact 27 * licensing (at) OpenSSL.org. 28 * 29 * 5. Products derived from this software may not be called "OpenSSL" 30 * nor may "OpenSSL" appear in their names without prior written 31 * permission of the OpenSSL Project. 32 * 33 * 6. Redistributions of any form whatsoever must retain the following 34 * acknowledgment: 35 * "This product includes software developed by the OpenSSL Project 36 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 37 * 38 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 39 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 40 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 41 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 42 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 43 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 44 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 45 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 46 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 47 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 48 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 49 * OF THE POSSIBILITY OF SUCH DAMAGE. 50 * ==================================================================== 51 * 52 * This product includes cryptographic software written by Eric Young 53 * (eay (at) cryptsoft.com). This product includes software written by Tim 54 * Hudson (tjh (at) cryptsoft.com). */ 55 56 #include <openssl/evp.h> 57 58 #include <openssl/digest.h> 59 #include <openssl/err.h> 60 61 #include "internal.h" 62 #include "../digest/internal.h" 63 64 65 /* md_begin_digset is a callback from the |EVP_MD_CTX| code that is called when 66 * a new digest is begun. */ 67 static int md_begin_digest(EVP_MD_CTX *ctx) { 68 return EVP_PKEY_CTX_ctrl(ctx->pctx, -1, EVP_PKEY_OP_TYPE_SIG, 69 EVP_PKEY_CTRL_DIGESTINIT, 0, ctx); 70 } 71 72 static const struct evp_md_pctx_ops md_pctx_ops = { 73 EVP_PKEY_CTX_free, 74 EVP_PKEY_CTX_dup, 75 md_begin_digest, 76 }; 77 78 static int do_sigver_init(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, 79 const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey, 80 int is_verify) { 81 if (ctx->pctx == NULL) { 82 ctx->pctx = EVP_PKEY_CTX_new(pkey, e); 83 } 84 if (ctx->pctx == NULL) { 85 return 0; 86 } 87 ctx->pctx_ops = &md_pctx_ops; 88 89 if (type == NULL) { 90 type = EVP_sha1(); 91 } 92 93 if (type == NULL) { 94 OPENSSL_PUT_ERROR(EVP, do_sigver_init, EVP_R_NO_DEFAULT_DIGEST); 95 return 0; 96 } 97 98 if (is_verify) { 99 if (ctx->pctx->pmeth->verifyctx_init) { 100 if (!ctx->pctx->pmeth->verifyctx_init(ctx->pctx, ctx)) { 101 return 0; 102 } 103 ctx->pctx->operation = EVP_PKEY_OP_VERIFYCTX; 104 } else if (!EVP_PKEY_verify_init(ctx->pctx)) { 105 return 0; 106 } 107 } else { 108 if (ctx->pctx->pmeth->signctx_init) { 109 if (!ctx->pctx->pmeth->signctx_init(ctx->pctx, ctx)) { 110 return 0; 111 } 112 ctx->pctx->operation = EVP_PKEY_OP_SIGNCTX; 113 } else if (!EVP_PKEY_sign_init(ctx->pctx)) { 114 return 0; 115 } 116 } 117 if (!EVP_PKEY_CTX_set_signature_md(ctx->pctx, type)) { 118 return 0; 119 } 120 if (pctx) { 121 *pctx = ctx->pctx; 122 } 123 if (!EVP_DigestInit_ex(ctx, type, e)) { 124 return 0; 125 } 126 return 1; 127 } 128 129 int EVP_DigestSignInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, const EVP_MD *type, 130 ENGINE *e, EVP_PKEY *pkey) { 131 return do_sigver_init(ctx, pctx, type, e, pkey, 0); 132 } 133 134 int EVP_DigestVerifyInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, 135 const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey) { 136 return do_sigver_init(ctx, pctx, type, e, pkey, 1); 137 } 138 139 int EVP_DigestSignUpdate(EVP_MD_CTX *ctx, const void *data, size_t len) { 140 return EVP_DigestUpdate(ctx, data, len); 141 } 142 143 int EVP_DigestVerifyUpdate(EVP_MD_CTX *ctx, const void *data, size_t len) { 144 return EVP_DigestUpdate(ctx, data, len); 145 } 146 147 int EVP_DigestSignFinal(EVP_MD_CTX *ctx, uint8_t *out_sig, 148 size_t *out_sig_len) { 149 int r = 0; 150 const int has_signctx = ctx->pctx->pmeth->signctx != NULL; 151 152 if (out_sig) { 153 EVP_MD_CTX tmp_ctx; 154 uint8_t md[EVP_MAX_MD_SIZE]; 155 unsigned int mdlen; 156 157 EVP_MD_CTX_init(&tmp_ctx); 158 if (!EVP_MD_CTX_copy_ex(&tmp_ctx, ctx)) { 159 return 0; 160 } 161 if (has_signctx) { 162 r = tmp_ctx.pctx->pmeth->signctx(tmp_ctx.pctx, out_sig, out_sig_len, &tmp_ctx); 163 } else { 164 r = EVP_DigestFinal_ex(&tmp_ctx, md, &mdlen); 165 if (r) { 166 r = EVP_PKEY_sign(ctx->pctx, out_sig, out_sig_len, md, mdlen); 167 } 168 } 169 EVP_MD_CTX_cleanup(&tmp_ctx); 170 return r; 171 } else { 172 if (has_signctx) { 173 return ctx->pctx->pmeth->signctx(ctx->pctx, out_sig, out_sig_len, ctx); 174 } else { 175 size_t s = EVP_MD_size(ctx->digest); 176 return EVP_PKEY_sign(ctx->pctx, out_sig, out_sig_len, NULL, s); 177 } 178 } 179 } 180 181 int EVP_DigestVerifyFinal(EVP_MD_CTX *ctx, const uint8_t *sig, 182 size_t sig_len) { 183 EVP_MD_CTX tmp_ctx; 184 uint8_t md[EVP_MAX_MD_SIZE]; 185 int r; 186 unsigned int mdlen; 187 188 EVP_MD_CTX_init(&tmp_ctx); 189 if (!EVP_MD_CTX_copy_ex(&tmp_ctx, ctx)) { 190 return 0; 191 } 192 if (ctx->pctx->pmeth->verifyctx) { 193 r = tmp_ctx.pctx->pmeth->verifyctx(tmp_ctx.pctx, sig, sig_len, &tmp_ctx); 194 } else { 195 r = EVP_DigestFinal_ex(&tmp_ctx, md, &mdlen); 196 if (r) { 197 r = EVP_PKEY_verify(ctx->pctx, sig, sig_len, md, mdlen); 198 } 199 } 200 201 EVP_MD_CTX_cleanup(&tmp_ctx); 202 203 return r; 204 } 205
