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| 1 /* crypto/dh/dh_key.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 #include <stdio.h> | |
| 60 #include "cryptlib.h" | |
| 61 #include <openssl/bn.h> | |
| 62 #include <openssl/rand.h> | |
| 63 #include <openssl/dh.h> | |
| 64 | |
| 65 static int generate_key(DH *dh); | |
| 66 static int compute_key(unsigned char *key, const BIGNUM *pub_key, DH *dh); | |
| 67 static int dh_bn_mod_exp(const DH *dh, BIGNUM *r, | |
| 68 const BIGNUM *a, const BIGNUM *p, | |
| 69 const BIGNUM *m, BN_CTX *ctx, | |
| 70 BN_MONT_CTX *m_ctx); | |
| 71 static int dh_init(DH *dh); | |
| 72 static int dh_finish(DH *dh); | |
| 73 | |
| 74 int DH_generate_key(DH *dh) | |
| 75 { | |
| 76 #ifdef OPENSSL_FIPS | |
| 77 if (FIPS_mode() && !(dh->meth->flags & DH_FLAG_FIPS_METHOD) | |
| 78 && !(dh->flags & DH_FLAG_NON_FIPS_ALLOW)) | |
| 79 { | |
| 80 DHerr(DH_F_DH_GENERATE_KEY, DH_R_NON_FIPS_METHOD); | |
| 81 return 0; | |
| 82 } | |
| 83 #endif | |
| 84 return dh->meth->generate_key(dh); | |
| 85 } | |
| 86 | |
| 87 int DH_compute_key(unsigned char *key, const BIGNUM *pub_key, DH *dh) | |
| 88 { | |
| 89 #ifdef OPENSSL_FIPS | |
| 90 if (FIPS_mode() && !(dh->meth->flags & DH_FLAG_FIPS_METHOD) | |
| 91 && !(dh->flags & DH_FLAG_NON_FIPS_ALLOW)) | |
| 92 { | |
| 93 DHerr(DH_F_DH_COMPUTE_KEY, DH_R_NON_FIPS_METHOD); | |
| 94 return 0; | |
| 95 } | |
| 96 #endif | |
| 97 return dh->meth->compute_key(key, pub_key, dh); | |
| 98 } | |
| 99 | |
| 100 static DH_METHOD dh_ossl = { | |
| 101 "OpenSSL DH Method", | |
| 102 generate_key, | |
| 103 compute_key, | |
| 104 dh_bn_mod_exp, | |
| 105 dh_init, | |
| 106 dh_finish, | |
| 107 0, | |
| 108 NULL, | |
| 109 NULL | |
| 110 }; | |
| 111 | |
| 112 const DH_METHOD *DH_OpenSSL(void) | |
| 113 { | |
| 114 return &dh_ossl; | |
| 115 } | |
| 116 | |
| 117 static int generate_key(DH *dh) | |
| 118 { | |
| 119 int ok=0; | |
| 120 int generate_new_key=0; | |
| 121 unsigned l; | |
| 122 BN_CTX *ctx; | |
| 123 BN_MONT_CTX *mont=NULL; | |
| 124 BIGNUM *pub_key=NULL,*priv_key=NULL; | |
| 125 | |
| 126 ctx = BN_CTX_new(); | |
| 127 if (ctx == NULL) goto err; | |
| 128 | |
| 129 if (dh->priv_key == NULL) | |
| 130 { | |
| 131 priv_key=BN_new(); | |
| 132 if (priv_key == NULL) goto err; | |
| 133 generate_new_key=1; | |
| 134 } | |
| 135 else | |
| 136 priv_key=dh->priv_key; | |
| 137 | |
| 138 if (dh->pub_key == NULL) | |
| 139 { | |
| 140 pub_key=BN_new(); | |
| 141 if (pub_key == NULL) goto err; | |
| 142 } | |
| 143 else | |
| 144 pub_key=dh->pub_key; | |
| 145 | |
| 146 | |
| 147 if (dh->flags & DH_FLAG_CACHE_MONT_P) | |
| 148 { | |
| 149 mont = BN_MONT_CTX_set_locked(&dh->method_mont_p, | |
| 150 CRYPTO_LOCK_DH, dh->p, ctx); | |
| 151 if (!mont) | |
| 152 goto err; | |
| 153 } | |
| 154 | |
| 155 if (generate_new_key) | |
| 156 { | |
| 157 if (dh->q) | |
| 158 { | |
| 159 do | |
| 160 { | |
| 161 if (!BN_rand_range(priv_key, dh->q)) | |
| 162 goto err; | |
| 163 } | |
| 164 while (BN_is_zero(priv_key) || BN_is_one(priv_key)); | |
| 165 } | |
| 166 else | |
| 167 { | |
| 168 /* secret exponent length */ | |
| 169 l = dh->length ? dh->length : BN_num_bits(dh->p)-1; | |
| 170 if (!BN_rand(priv_key, l, 0, 0)) goto err; | |
| 171 } | |
| 172 } | |
| 173 | |
| 174 { | |
| 175 BIGNUM local_prk; | |
| 176 BIGNUM *prk; | |
| 177 | |
| 178 if ((dh->flags & DH_FLAG_NO_EXP_CONSTTIME) == 0) | |
| 179 { | |
| 180 BN_init(&local_prk); | |
| 181 prk = &local_prk; | |
| 182 BN_with_flags(prk, priv_key, BN_FLG_CONSTTIME); | |
| 183 } | |
| 184 else | |
| 185 prk = priv_key; | |
| 186 | |
| 187 if (!dh->meth->bn_mod_exp(dh, pub_key, dh->g, prk, dh->p, ctx, m
ont)) goto err; | |
| 188 } | |
| 189 | |
| 190 dh->pub_key=pub_key; | |
| 191 dh->priv_key=priv_key; | |
| 192 ok=1; | |
| 193 err: | |
| 194 if (ok != 1) | |
| 195 DHerr(DH_F_GENERATE_KEY,ERR_R_BN_LIB); | |
| 196 | |
| 197 if ((pub_key != NULL) && (dh->pub_key == NULL)) BN_free(pub_key); | |
| 198 if ((priv_key != NULL) && (dh->priv_key == NULL)) BN_free(priv_key); | |
| 199 BN_CTX_free(ctx); | |
| 200 return(ok); | |
| 201 } | |
| 202 | |
| 203 static int compute_key(unsigned char *key, const BIGNUM *pub_key, DH *dh) | |
| 204 { | |
| 205 BN_CTX *ctx=NULL; | |
| 206 BN_MONT_CTX *mont=NULL; | |
| 207 BIGNUM *tmp; | |
| 208 int ret= -1; | |
| 209 int check_result; | |
| 210 | |
| 211 if (BN_num_bits(dh->p) > OPENSSL_DH_MAX_MODULUS_BITS) | |
| 212 { | |
| 213 DHerr(DH_F_COMPUTE_KEY,DH_R_MODULUS_TOO_LARGE); | |
| 214 goto err; | |
| 215 } | |
| 216 | |
| 217 ctx = BN_CTX_new(); | |
| 218 if (ctx == NULL) goto err; | |
| 219 BN_CTX_start(ctx); | |
| 220 tmp = BN_CTX_get(ctx); | |
| 221 | |
| 222 if (dh->priv_key == NULL) | |
| 223 { | |
| 224 DHerr(DH_F_COMPUTE_KEY,DH_R_NO_PRIVATE_VALUE); | |
| 225 goto err; | |
| 226 } | |
| 227 | |
| 228 if (dh->flags & DH_FLAG_CACHE_MONT_P) | |
| 229 { | |
| 230 mont = BN_MONT_CTX_set_locked(&dh->method_mont_p, | |
| 231 CRYPTO_LOCK_DH, dh->p, ctx); | |
| 232 if ((dh->flags & DH_FLAG_NO_EXP_CONSTTIME) == 0) | |
| 233 { | |
| 234 /* XXX */ | |
| 235 BN_set_flags(dh->priv_key, BN_FLG_CONSTTIME); | |
| 236 } | |
| 237 if (!mont) | |
| 238 goto err; | |
| 239 } | |
| 240 | |
| 241 if (!DH_check_pub_key(dh, pub_key, &check_result) || check_result) | |
| 242 { | |
| 243 DHerr(DH_F_COMPUTE_KEY,DH_R_INVALID_PUBKEY); | |
| 244 goto err; | |
| 245 } | |
| 246 | |
| 247 if (!dh->meth->bn_mod_exp(dh, tmp, pub_key, dh->priv_key,dh->p,ctx,mont)
) | |
| 248 { | |
| 249 DHerr(DH_F_COMPUTE_KEY,ERR_R_BN_LIB); | |
| 250 goto err; | |
| 251 } | |
| 252 | |
| 253 ret=BN_bn2bin(tmp,key); | |
| 254 err: | |
| 255 if (ctx != NULL) | |
| 256 { | |
| 257 BN_CTX_end(ctx); | |
| 258 BN_CTX_free(ctx); | |
| 259 } | |
| 260 return(ret); | |
| 261 } | |
| 262 | |
| 263 static int dh_bn_mod_exp(const DH *dh, BIGNUM *r, | |
| 264 const BIGNUM *a, const BIGNUM *p, | |
| 265 const BIGNUM *m, BN_CTX *ctx, | |
| 266 BN_MONT_CTX *m_ctx) | |
| 267 { | |
| 268 /* If a is only one word long and constant time is false, use the faster | |
| 269 * exponenentiation function. | |
| 270 */ | |
| 271 if (a->top == 1 && ((dh->flags & DH_FLAG_NO_EXP_CONSTTIME) != 0)) | |
| 272 { | |
| 273 BN_ULONG A = a->d[0]; | |
| 274 return BN_mod_exp_mont_word(r,A,p,m,ctx,m_ctx); | |
| 275 } | |
| 276 else | |
| 277 return BN_mod_exp_mont(r,a,p,m,ctx,m_ctx); | |
| 278 } | |
| 279 | |
| 280 | |
| 281 static int dh_init(DH *dh) | |
| 282 { | |
| 283 dh->flags |= DH_FLAG_CACHE_MONT_P; | |
| 284 return(1); | |
| 285 } | |
| 286 | |
| 287 static int dh_finish(DH *dh) | |
| 288 { | |
| 289 if(dh->method_mont_p) | |
| 290 BN_MONT_CTX_free(dh->method_mont_p); | |
| 291 return(1); | |
| 292 } | |
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Chromium Code Reviews
Issue 2072073002:
Delete bundled copy of OpenSSL and replace with README. (Closed)
Base URL: https://chromium.googlesource.com/chromium/deps/openssl@master