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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 <openssl/err.h> | |
| 61 #include <openssl/bn.h> | |
| 62 #ifndef OPENSSL_NO_RAND | |
| 63 #include <openssl/rand.h> | |
| 64 #endif | |
| 65 #ifndef OPENSSL_NO_DH | |
| 66 #include <openssl/dh.h> | |
| 67 #include <openssl/fips.h> | |
| 68 | |
| 69 #ifdef OPENSSL_FIPS | |
| 70 | |
| 71 static int generate_key(DH *dh); | |
| 72 static int compute_key(unsigned char *key, const BIGNUM *pub_key, DH *dh); | |
| 73 static int dh_bn_mod_exp(const DH *dh, BIGNUM *r, | |
| 74 const BIGNUM *a, const BIGNUM *p, | |
| 75 const BIGNUM *m, BN_CTX *ctx, | |
| 76 BN_MONT_CTX *m_ctx); | |
| 77 static int dh_init(DH *dh); | |
| 78 static int dh_finish(DH *dh); | |
| 79 | |
| 80 int DH_generate_key(DH *dh) | |
| 81 { | |
| 82 return dh->meth->generate_key(dh); | |
| 83 } | |
| 84 | |
| 85 int DH_compute_key(unsigned char *key, const BIGNUM *pub_key, DH *dh) | |
| 86 { | |
| 87 return dh->meth->compute_key(key, pub_key, dh); | |
| 88 } | |
| 89 | |
| 90 static const DH_METHOD dh_ossl = { | |
| 91 "OpenSSL DH Method", | |
| 92 generate_key, | |
| 93 compute_key, | |
| 94 dh_bn_mod_exp, | |
| 95 dh_init, | |
| 96 dh_finish, | |
| 97 0, | |
| 98 NULL | |
| 99 }; | |
| 100 | |
| 101 const DH_METHOD *DH_OpenSSL(void) | |
| 102 { | |
| 103 return &dh_ossl; | |
| 104 } | |
| 105 | |
| 106 static int generate_key(DH *dh) | |
| 107 { | |
| 108 int ok=0; | |
| 109 int generate_new_key=0; | |
| 110 unsigned l; | |
| 111 BN_CTX *ctx; | |
| 112 BN_MONT_CTX *mont=NULL; | |
| 113 BIGNUM *pub_key=NULL,*priv_key=NULL; | |
| 114 | |
| 115 if (FIPS_mode() && (BN_num_bits(dh->p) < OPENSSL_DH_FIPS_MIN_MODULUS_BIT
S)) | |
| 116 { | |
| 117 DHerr(DH_F_GENERATE_KEY, DH_R_KEY_SIZE_TOO_SMALL); | |
| 118 return 0; | |
| 119 } | |
| 120 | |
| 121 ctx = BN_CTX_new(); | |
| 122 if (ctx == NULL) goto err; | |
| 123 | |
| 124 if (dh->priv_key == NULL) | |
| 125 { | |
| 126 priv_key=BN_new(); | |
| 127 if (priv_key == NULL) goto err; | |
| 128 generate_new_key=1; | |
| 129 } | |
| 130 else | |
| 131 priv_key=dh->priv_key; | |
| 132 | |
| 133 if (dh->pub_key == NULL) | |
| 134 { | |
| 135 pub_key=BN_new(); | |
| 136 if (pub_key == NULL) goto err; | |
| 137 } | |
| 138 else | |
| 139 pub_key=dh->pub_key; | |
| 140 | |
| 141 if (dh->flags & DH_FLAG_CACHE_MONT_P) | |
| 142 { | |
| 143 mont = BN_MONT_CTX_set_locked( | |
| 144 (BN_MONT_CTX **)&dh->method_mont_p, | |
| 145 CRYPTO_LOCK_DH, dh->p, ctx); | |
| 146 if (!mont) | |
| 147 goto err; | |
| 148 } | |
| 149 | |
| 150 if (generate_new_key) | |
| 151 { | |
| 152 l = dh->length ? dh->length : BN_num_bits(dh->p)-1; /* secret ex
ponent length */ | |
| 153 if (!BN_rand(priv_key, l, 0, 0)) goto err; | |
| 154 } | |
| 155 | |
| 156 { | |
| 157 BIGNUM local_prk; | |
| 158 BIGNUM *prk; | |
| 159 | |
| 160 if ((dh->flags & DH_FLAG_NO_EXP_CONSTTIME) == 0) | |
| 161 { | |
| 162 BN_init(&local_prk); | |
| 163 prk = &local_prk; | |
| 164 BN_with_flags(prk, priv_key, BN_FLG_CONSTTIME); | |
| 165 } | |
| 166 else | |
| 167 prk = priv_key; | |
| 168 | |
| 169 if (!dh->meth->bn_mod_exp(dh, pub_key, dh->g, prk, dh->p, ctx, m
ont)) | |
| 170 goto err; | |
| 171 } | |
| 172 | |
| 173 dh->pub_key=pub_key; | |
| 174 dh->priv_key=priv_key; | |
| 175 ok=1; | |
| 176 err: | |
| 177 if (ok != 1) | |
| 178 DHerr(DH_F_GENERATE_KEY,ERR_R_BN_LIB); | |
| 179 | |
| 180 if ((pub_key != NULL) && (dh->pub_key == NULL)) BN_free(pub_key); | |
| 181 if ((priv_key != NULL) && (dh->priv_key == NULL)) BN_free(priv_key); | |
| 182 BN_CTX_free(ctx); | |
| 183 return(ok); | |
| 184 } | |
| 185 | |
| 186 static int compute_key(unsigned char *key, const BIGNUM *pub_key, DH *dh) | |
| 187 { | |
| 188 BN_CTX *ctx; | |
| 189 BN_MONT_CTX *mont=NULL; | |
| 190 BIGNUM *tmp; | |
| 191 int ret= -1; | |
| 192 | |
| 193 ctx = BN_CTX_new(); | |
| 194 if (ctx == NULL) goto err; | |
| 195 BN_CTX_start(ctx); | |
| 196 tmp = BN_CTX_get(ctx); | |
| 197 | |
| 198 if (BN_num_bits(dh->p) > OPENSSL_DH_MAX_MODULUS_BITS) | |
| 199 { | |
| 200 DHerr(DH_F_COMPUTE_KEY,DH_R_MODULUS_TOO_LARGE); | |
| 201 goto err; | |
| 202 } | |
| 203 | |
| 204 if (FIPS_mode() && (BN_num_bits(dh->p) < OPENSSL_DH_FIPS_MIN_MODULUS_BIT
S)) | |
| 205 { | |
| 206 DHerr(DH_F_COMPUTE_KEY, DH_R_KEY_SIZE_TOO_SMALL); | |
| 207 goto err; | |
| 208 } | |
| 209 | |
| 210 if (dh->priv_key == NULL) | |
| 211 { | |
| 212 DHerr(DH_F_COMPUTE_KEY,DH_R_NO_PRIVATE_VALUE); | |
| 213 goto err; | |
| 214 } | |
| 215 | |
| 216 if (dh->flags & DH_FLAG_CACHE_MONT_P) | |
| 217 { | |
| 218 mont = BN_MONT_CTX_set_locked( | |
| 219 (BN_MONT_CTX **)&dh->method_mont_p, | |
| 220 CRYPTO_LOCK_DH, dh->p, ctx); | |
| 221 if ((dh->flags & DH_FLAG_NO_EXP_CONSTTIME) == 0) | |
| 222 { | |
| 223 /* XXX */ | |
| 224 BN_set_flags(dh->priv_key, BN_FLG_CONSTTIME); | |
| 225 } | |
| 226 if (!mont) | |
| 227 goto err; | |
| 228 } | |
| 229 | |
| 230 if (!dh->meth->bn_mod_exp(dh, tmp, pub_key, dh->priv_key,dh->p,ctx,mont)
) | |
| 231 { | |
| 232 DHerr(DH_F_COMPUTE_KEY,ERR_R_BN_LIB); | |
| 233 goto err; | |
| 234 } | |
| 235 | |
| 236 ret=BN_bn2bin(tmp,key); | |
| 237 err: | |
| 238 BN_CTX_end(ctx); | |
| 239 BN_CTX_free(ctx); | |
| 240 return(ret); | |
| 241 } | |
| 242 | |
| 243 static int dh_bn_mod_exp(const DH *dh, BIGNUM *r, | |
| 244 const BIGNUM *a, const BIGNUM *p, | |
| 245 const BIGNUM *m, BN_CTX *ctx, | |
| 246 BN_MONT_CTX *m_ctx) | |
| 247 { | |
| 248 /* If a is only one word long and constant time is false, use the faster | |
| 249 * exponenentiation function. | |
| 250 */ | |
| 251 if (a->top == 1 && ((dh->flags & DH_FLAG_NO_EXP_CONSTTIME) != 0)) | |
| 252 { | |
| 253 BN_ULONG A = a->d[0]; | |
| 254 return BN_mod_exp_mont_word(r,A,p,m,ctx,m_ctx); | |
| 255 } | |
| 256 else | |
| 257 return BN_mod_exp_mont(r,a,p,m,ctx,m_ctx); | |
| 258 } | |
| 259 | |
| 260 | |
| 261 static int dh_init(DH *dh) | |
| 262 { | |
| 263 FIPS_selftest_check(); | |
| 264 dh->flags |= DH_FLAG_CACHE_MONT_P; | |
| 265 return(1); | |
| 266 } | |
| 267 | |
| 268 static int dh_finish(DH *dh) | |
| 269 { | |
| 270 if(dh->method_mont_p) | |
| 271 BN_MONT_CTX_free((BN_MONT_CTX *)dh->method_mont_p); | |
| 272 return(1); | |
| 273 } | |
| 274 | |
| 275 #endif | |
| 276 #endif | |
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Chromium Code Reviews
Issue 9254031:
Upgrade chrome's OpenSSL to same version Android ships with. (Closed)
Base URL: http://src.chromium.org/svn/trunk/deps/third_party/openssl/