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/err.h> 59 60 #include "internal.h" 61 #include "../fipsmodule/digest/internal.h" 62 63 64 enum evp_sign_verify_t { 65 evp_sign, 66 evp_verify, 67 }; 68 69 static const struct evp_md_pctx_ops md_pctx_ops = { 70 EVP_PKEY_CTX_free, 71 EVP_PKEY_CTX_dup, 72 }; 73 74 static int uses_prehash(EVP_MD_CTX *ctx, enum evp_sign_verify_t op) { 75 return (op == evp_sign) ? (ctx->pctx->pmeth->sign != NULL) 76 : (ctx->pctx->pmeth->verify != NULL); 77 } 78 79 static int do_sigver_init(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, 80 const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey, 81 enum evp_sign_verify_t op) { 82 if (ctx->pctx == NULL) { 83 ctx->pctx = EVP_PKEY_CTX_new(pkey, e); 84 } 85 if (ctx->pctx == NULL) { 86 return 0; 87 } 88 ctx->pctx_ops = &md_pctx_ops; 89 90 if (op == evp_verify) { 91 if (!EVP_PKEY_verify_init(ctx->pctx)) { 92 return 0; 93 } 94 } else { 95 if (!EVP_PKEY_sign_init(ctx->pctx)) { 96 return 0; 97 } 98 } 99 100 if (type != NULL && 101 !EVP_PKEY_CTX_set_signature_md(ctx->pctx, type)) { 102 return 0; 103 } 104 105 if (uses_prehash(ctx, op)) { 106 if (type == NULL) { 107 OPENSSL_PUT_ERROR(EVP, EVP_R_NO_DEFAULT_DIGEST); 108 return 0; 109 } 110 if (!EVP_DigestInit_ex(ctx, type, e)) { 111 return 0; 112 } 113 } 114 115 if (pctx) { 116 *pctx = ctx->pctx; 117 } 118 return 1; 119 } 120 121 int EVP_DigestSignInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, const EVP_MD *type, 122 ENGINE *e, EVP_PKEY *pkey) { 123 return do_sigver_init(ctx, pctx, type, e, pkey, evp_sign); 124 } 125 126 int EVP_DigestVerifyInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, 127 const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey) { 128 return do_sigver_init(ctx, pctx, type, e, pkey, evp_verify); 129 } 130 131 int EVP_DigestSignUpdate(EVP_MD_CTX *ctx, const void *data, size_t len) { 132 if (!uses_prehash(ctx, evp_sign)) { 133 OPENSSL_PUT_ERROR(EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE); 134 return 0; 135 } 136 137 return EVP_DigestUpdate(ctx, data, len); 138 } 139 140 int EVP_DigestVerifyUpdate(EVP_MD_CTX *ctx, const void *data, size_t len) { 141 if (!uses_prehash(ctx, evp_verify)) { 142 OPENSSL_PUT_ERROR(EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE); 143 return 0; 144 } 145 146 return EVP_DigestUpdate(ctx, data, len); 147 } 148 149 int EVP_DigestSignFinal(EVP_MD_CTX *ctx, uint8_t *out_sig, 150 size_t *out_sig_len) { 151 if (!uses_prehash(ctx, evp_sign)) { 152 OPENSSL_PUT_ERROR(EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE); 153 return 0; 154 } 155 156 if (out_sig) { 157 EVP_MD_CTX tmp_ctx; 158 int ret; 159 uint8_t md[EVP_MAX_MD_SIZE]; 160 unsigned int mdlen; 161 162 EVP_MD_CTX_init(&tmp_ctx); 163 ret = EVP_MD_CTX_copy_ex(&tmp_ctx, ctx) && 164 EVP_DigestFinal_ex(&tmp_ctx, md, &mdlen) && 165 EVP_PKEY_sign(ctx->pctx, out_sig, out_sig_len, md, mdlen); 166 EVP_MD_CTX_cleanup(&tmp_ctx); 167 168 return ret; 169 } else { 170 size_t s = EVP_MD_size(ctx->digest); 171 return EVP_PKEY_sign(ctx->pctx, out_sig, out_sig_len, NULL, s); 172 } 173 } 174 175 int EVP_DigestVerifyFinal(EVP_MD_CTX *ctx, const uint8_t *sig, 176 size_t sig_len) { 177 if (!uses_prehash(ctx, evp_verify)) { 178 OPENSSL_PUT_ERROR(EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE); 179 return 0; 180 } 181 182 EVP_MD_CTX tmp_ctx; 183 int ret; 184 uint8_t md[EVP_MAX_MD_SIZE]; 185 unsigned int mdlen; 186 187 EVP_MD_CTX_init(&tmp_ctx); 188 ret = EVP_MD_CTX_copy_ex(&tmp_ctx, ctx) && 189 EVP_DigestFinal_ex(&tmp_ctx, md, &mdlen) && 190 EVP_PKEY_verify(ctx->pctx, sig, sig_len, md, mdlen); 191 EVP_MD_CTX_cleanup(&tmp_ctx); 192 193 return ret; 194 } 195 196 int EVP_DigestSign(EVP_MD_CTX *ctx, uint8_t *out_sig, size_t *out_sig_len, 197 const uint8_t *data, size_t data_len) { 198 if (uses_prehash(ctx, evp_sign)) { 199 // If |out_sig| is NULL, the caller is only querying the maximum output 200 // length. |data| should only be incorporated in the final call. 201 if (out_sig != NULL && 202 !EVP_DigestSignUpdate(ctx, data, data_len)) { 203 return 0; 204 } 205 206 return EVP_DigestSignFinal(ctx, out_sig, out_sig_len); 207 } 208 209 if (ctx->pctx->pmeth->sign_message == NULL) { 210 OPENSSL_PUT_ERROR(EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE); 211 return 0; 212 } 213 214 return ctx->pctx->pmeth->sign_message(ctx->pctx, out_sig, out_sig_len, data, 215 data_len); 216 } 217 218 int EVP_DigestVerify(EVP_MD_CTX *ctx, const uint8_t *sig, size_t sig_len, 219 const uint8_t *data, size_t len) { 220 if (uses_prehash(ctx, evp_verify)) { 221 return EVP_DigestVerifyUpdate(ctx, data, len) && 222 EVP_DigestVerifyFinal(ctx, sig, sig_len); 223 } 224 225 if (ctx->pctx->pmeth->verify_message == NULL) { 226 OPENSSL_PUT_ERROR(EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE); 227 return 0; 228 } 229 230 return ctx->pctx->pmeth->verify_message(ctx->pctx, sig, sig_len, data, len); 231 } 232
