1 /* Written by Dr Stephen N Henson (steve (at) openssl.org) for the OpenSSL 2 * project 2006. 3 */ 4 /* ==================================================================== 5 * Copyright (c) 2006 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 <string.h> 59 60 #include <openssl/bn.h> 61 #include <openssl/buf.h> 62 #include <openssl/digest.h> 63 #include <openssl/ec.h> 64 #include <openssl/ec_key.h> 65 #include <openssl/ecdh.h> 66 #include <openssl/ecdsa.h> 67 #include <openssl/err.h> 68 #include <openssl/mem.h> 69 #include <openssl/nid.h> 70 71 #include "internal.h" 72 #include "../fipsmodule/ec/internal.h" 73 #include "../internal.h" 74 75 76 typedef struct { 77 // message digest 78 const EVP_MD *md; 79 } EC_PKEY_CTX; 80 81 82 static int pkey_ec_init(EVP_PKEY_CTX *ctx) { 83 EC_PKEY_CTX *dctx; 84 dctx = OPENSSL_malloc(sizeof(EC_PKEY_CTX)); 85 if (!dctx) { 86 return 0; 87 } 88 OPENSSL_memset(dctx, 0, sizeof(EC_PKEY_CTX)); 89 90 ctx->data = dctx; 91 92 return 1; 93 } 94 95 static int pkey_ec_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src) { 96 EC_PKEY_CTX *dctx, *sctx; 97 if (!pkey_ec_init(dst)) { 98 return 0; 99 } 100 sctx = src->data; 101 dctx = dst->data; 102 103 dctx->md = sctx->md; 104 105 return 1; 106 } 107 108 static void pkey_ec_cleanup(EVP_PKEY_CTX *ctx) { 109 EC_PKEY_CTX *dctx = ctx->data; 110 if (!dctx) { 111 return; 112 } 113 114 OPENSSL_free(dctx); 115 } 116 117 static int pkey_ec_sign(EVP_PKEY_CTX *ctx, uint8_t *sig, size_t *siglen, 118 const uint8_t *tbs, size_t tbslen) { 119 unsigned int sltmp; 120 EC_KEY *ec = ctx->pkey->pkey.ec; 121 122 if (!sig) { 123 *siglen = ECDSA_size(ec); 124 return 1; 125 } else if (*siglen < (size_t)ECDSA_size(ec)) { 126 OPENSSL_PUT_ERROR(EVP, EVP_R_BUFFER_TOO_SMALL); 127 return 0; 128 } 129 130 if (!ECDSA_sign(0, tbs, tbslen, sig, &sltmp, ec)) { 131 return 0; 132 } 133 *siglen = (size_t)sltmp; 134 return 1; 135 } 136 137 static int pkey_ec_verify(EVP_PKEY_CTX *ctx, const uint8_t *sig, size_t siglen, 138 const uint8_t *tbs, size_t tbslen) { 139 return ECDSA_verify(0, tbs, tbslen, sig, siglen, ctx->pkey->pkey.ec); 140 } 141 142 static int pkey_ec_derive(EVP_PKEY_CTX *ctx, uint8_t *key, 143 size_t *keylen) { 144 int ret; 145 size_t outlen; 146 const EC_POINT *pubkey = NULL; 147 EC_KEY *eckey; 148 149 if (!ctx->pkey || !ctx->peerkey) { 150 OPENSSL_PUT_ERROR(EVP, EVP_R_KEYS_NOT_SET); 151 return 0; 152 } 153 154 eckey = ctx->pkey->pkey.ec; 155 156 if (!key) { 157 const EC_GROUP *group; 158 group = EC_KEY_get0_group(eckey); 159 *keylen = (EC_GROUP_get_degree(group) + 7) / 8; 160 return 1; 161 } 162 pubkey = EC_KEY_get0_public_key(ctx->peerkey->pkey.ec); 163 164 // NB: unlike PKCS#3 DH, if *outlen is less than maximum size this is 165 // not an error, the result is truncated. 166 167 outlen = *keylen; 168 169 ret = ECDH_compute_key(key, outlen, pubkey, eckey, 0); 170 if (ret < 0) { 171 return 0; 172 } 173 *keylen = ret; 174 return 1; 175 } 176 177 static int pkey_ec_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2) { 178 EC_PKEY_CTX *dctx = ctx->data; 179 180 switch (type) { 181 case EVP_PKEY_CTRL_MD: 182 if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1 && 183 EVP_MD_type((const EVP_MD *)p2) != NID_ecdsa_with_SHA1 && 184 EVP_MD_type((const EVP_MD *)p2) != NID_sha224 && 185 EVP_MD_type((const EVP_MD *)p2) != NID_sha256 && 186 EVP_MD_type((const EVP_MD *)p2) != NID_sha384 && 187 EVP_MD_type((const EVP_MD *)p2) != NID_sha512) { 188 OPENSSL_PUT_ERROR(EVP, EVP_R_INVALID_DIGEST_TYPE); 189 return 0; 190 } 191 dctx->md = p2; 192 return 1; 193 194 case EVP_PKEY_CTRL_GET_MD: 195 *(const EVP_MD **)p2 = dctx->md; 196 return 1; 197 198 case EVP_PKEY_CTRL_PEER_KEY: 199 // Default behaviour is OK 200 return 1; 201 202 default: 203 OPENSSL_PUT_ERROR(EVP, EVP_R_COMMAND_NOT_SUPPORTED); 204 return 0; 205 } 206 } 207 208 static int pkey_ec_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey) { 209 if (ctx->pkey == NULL) { 210 OPENSSL_PUT_ERROR(EVP, EVP_R_NO_PARAMETERS_SET); 211 return 0; 212 } 213 EC_KEY *ec = EC_KEY_new(); 214 if (ec == NULL || 215 !EC_KEY_set_group(ec, EC_KEY_get0_group(ctx->pkey->pkey.ec)) || 216 !EC_KEY_generate_key(ec)) { 217 EC_KEY_free(ec); 218 return 0; 219 } 220 EVP_PKEY_assign_EC_KEY(pkey, ec); 221 return 1; 222 } 223 224 const EVP_PKEY_METHOD ec_pkey_meth = { 225 EVP_PKEY_EC, 226 pkey_ec_init, 227 pkey_ec_copy, 228 pkey_ec_cleanup, 229 pkey_ec_keygen, 230 pkey_ec_sign, 231 NULL /* sign_message */, 232 pkey_ec_verify, 233 NULL /* verify_message */, 234 NULL /* verify_recover */, 235 NULL /* encrypt */, 236 NULL /* decrypt */, 237 pkey_ec_derive, 238 pkey_ec_ctrl, 239 }; 240
