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author | marha <marha@users.sourceforge.net> | 2015-02-22 21:39:56 +0100 |
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committer | marha <marha@users.sourceforge.net> | 2015-02-22 21:39:56 +0100 |
commit | 462f18c7b25fe3e467f837647d07ab0a78aa8d2b (patch) | |
tree | fc8013c0a1bac05a1945846c1697e973f4c35013 /openssl/crypto/dh/dh_key.c | |
parent | 36f711ee12b6dd5184198abed3aa551efb585587 (diff) | |
download | vcxsrv-462f18c7b25fe3e467f837647d07ab0a78aa8d2b.tar.gz vcxsrv-462f18c7b25fe3e467f837647d07ab0a78aa8d2b.tar.bz2 vcxsrv-462f18c7b25fe3e467f837647d07ab0a78aa8d2b.zip |
Merged origin/release (checked in because wanted to merge new stuff)
Diffstat (limited to 'openssl/crypto/dh/dh_key.c')
-rw-r--r-- | openssl/crypto/dh/dh_key.c | 373 |
1 files changed, 185 insertions, 188 deletions
diff --git a/openssl/crypto/dh/dh_key.c b/openssl/crypto/dh/dh_key.c index 89a74db4e..1d80fb2c5 100644 --- a/openssl/crypto/dh/dh_key.c +++ b/openssl/crypto/dh/dh_key.c @@ -5,21 +5,21 @@ * This package is an SSL implementation written * by Eric Young (eay@cryptsoft.com). * The implementation was written so as to conform with Netscapes SSL. - * + * * This library is free for commercial and non-commercial use as long as * the following conditions are aheared to. The following conditions * apply to all code found in this distribution, be it the RC4, RSA, * lhash, DES, etc., code; not just the SSL code. The SSL documentation * included with this distribution is covered by the same copyright terms * except that the holder is Tim Hudson (tjh@cryptsoft.com). - * + * * Copyright remains Eric Young's, and as such any Copyright notices in * the code are not to be removed. * If this package is used in a product, Eric Young should be given attribution * as the author of the parts of the library used. * This can be in the form of a textual message at program startup or * in documentation (online or textual) provided with the package. - * + * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: @@ -34,10 +34,10 @@ * Eric Young (eay@cryptsoft.com)" * The word 'cryptographic' can be left out if the rouines from the library * being used are not cryptographic related :-). - * 4. If you include any Windows specific code (or a derivative thereof) from + * 4. If you include any Windows specific code (or a derivative thereof) from * the apps directory (application code) you must include an acknowledgement: * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" - * + * * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE @@ -49,7 +49,7 @@ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. - * + * * The licence and distribution terms for any publically available version or * derivative of this code cannot be changed. i.e. this code cannot simply be * copied and put under another distribution licence @@ -65,228 +65,225 @@ static int generate_key(DH *dh); static int compute_key(unsigned char *key, const BIGNUM *pub_key, DH *dh); static int dh_bn_mod_exp(const DH *dh, BIGNUM *r, - const BIGNUM *a, const BIGNUM *p, - const BIGNUM *m, BN_CTX *ctx, - BN_MONT_CTX *m_ctx); + const BIGNUM *a, const BIGNUM *p, + const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx); static int dh_init(DH *dh); static int dh_finish(DH *dh); int DH_generate_key(DH *dh) - { +{ #ifdef OPENSSL_FIPS - if (FIPS_mode() && !(dh->meth->flags & DH_FLAG_FIPS_METHOD) - && !(dh->flags & DH_FLAG_NON_FIPS_ALLOW)) - { - DHerr(DH_F_DH_GENERATE_KEY, DH_R_NON_FIPS_METHOD); - return 0; - } + if (FIPS_mode() && !(dh->meth->flags & DH_FLAG_FIPS_METHOD) + && !(dh->flags & DH_FLAG_NON_FIPS_ALLOW)) { + DHerr(DH_F_DH_GENERATE_KEY, DH_R_NON_FIPS_METHOD); + return 0; + } #endif - return dh->meth->generate_key(dh); - } + return dh->meth->generate_key(dh); +} int DH_compute_key(unsigned char *key, const BIGNUM *pub_key, DH *dh) - { +{ #ifdef OPENSSL_FIPS - if (FIPS_mode() && !(dh->meth->flags & DH_FLAG_FIPS_METHOD) - && !(dh->flags & DH_FLAG_NON_FIPS_ALLOW)) - { - DHerr(DH_F_DH_COMPUTE_KEY, DH_R_NON_FIPS_METHOD); - return 0; - } + if (FIPS_mode() && !(dh->meth->flags & DH_FLAG_FIPS_METHOD) + && !(dh->flags & DH_FLAG_NON_FIPS_ALLOW)) { + DHerr(DH_F_DH_COMPUTE_KEY, DH_R_NON_FIPS_METHOD); + return 0; + } #endif - return dh->meth->compute_key(key, pub_key, dh); - } + return dh->meth->compute_key(key, pub_key, dh); +} + +int DH_compute_key_padded(unsigned char *key, const BIGNUM *pub_key, DH *dh) +{ + int rv, pad; + rv = dh->meth->compute_key(key, pub_key, dh); + if (rv <= 0) + return rv; + pad = BN_num_bytes(dh->p) - rv; + if (pad > 0) { + memmove(key + pad, key, rv); + memset(key, 0, pad); + } + return rv + pad; +} static DH_METHOD dh_ossl = { -"OpenSSL DH Method", -generate_key, -compute_key, -dh_bn_mod_exp, -dh_init, -dh_finish, -0, -NULL, -NULL + "OpenSSL DH Method", + generate_key, + compute_key, + dh_bn_mod_exp, + dh_init, + dh_finish, + 0, + NULL, + NULL }; const DH_METHOD *DH_OpenSSL(void) { - return &dh_ossl; + return &dh_ossl; } static int generate_key(DH *dh) - { - int ok=0; - int generate_new_key=0; - unsigned l; - BN_CTX *ctx; - BN_MONT_CTX *mont=NULL; - BIGNUM *pub_key=NULL,*priv_key=NULL; +{ + int ok = 0; + int generate_new_key = 0; + unsigned l; + BN_CTX *ctx; + BN_MONT_CTX *mont = NULL; + BIGNUM *pub_key = NULL, *priv_key = NULL; - ctx = BN_CTX_new(); - if (ctx == NULL) goto err; + ctx = BN_CTX_new(); + if (ctx == NULL) + goto err; - if (dh->priv_key == NULL) - { - priv_key=BN_new(); - if (priv_key == NULL) goto err; - generate_new_key=1; - } - else - priv_key=dh->priv_key; + if (dh->priv_key == NULL) { + priv_key = BN_new(); + if (priv_key == NULL) + goto err; + generate_new_key = 1; + } else + priv_key = dh->priv_key; - if (dh->pub_key == NULL) - { - pub_key=BN_new(); - if (pub_key == NULL) goto err; - } - else - pub_key=dh->pub_key; + if (dh->pub_key == NULL) { + pub_key = BN_new(); + if (pub_key == NULL) + goto err; + } else + pub_key = dh->pub_key; + if (dh->flags & DH_FLAG_CACHE_MONT_P) { + mont = BN_MONT_CTX_set_locked(&dh->method_mont_p, + CRYPTO_LOCK_DH, dh->p, ctx); + if (!mont) + goto err; + } - if (dh->flags & DH_FLAG_CACHE_MONT_P) - { - mont = BN_MONT_CTX_set_locked(&dh->method_mont_p, - CRYPTO_LOCK_DH, dh->p, ctx); - if (!mont) - goto err; - } + if (generate_new_key) { + if (dh->q) { + do { + if (!BN_rand_range(priv_key, dh->q)) + goto err; + } + while (BN_is_zero(priv_key) || BN_is_one(priv_key)); + } else { + /* secret exponent length */ + l = dh->length ? dh->length : BN_num_bits(dh->p) - 1; + if (!BN_rand(priv_key, l, 0, 0)) + goto err; + } + } - if (generate_new_key) - { - if (dh->q) - { - do - { - if (!BN_rand_range(priv_key, dh->q)) - goto err; - } - while (BN_is_zero(priv_key) || BN_is_one(priv_key)); - } - else - { - /* secret exponent length */ - l = dh->length ? dh->length : BN_num_bits(dh->p)-1; - if (!BN_rand(priv_key, l, 0, 0)) goto err; - } - } + { + BIGNUM local_prk; + BIGNUM *prk; - { - BIGNUM local_prk; - BIGNUM *prk; + if ((dh->flags & DH_FLAG_NO_EXP_CONSTTIME) == 0) { + BN_init(&local_prk); + prk = &local_prk; + BN_with_flags(prk, priv_key, BN_FLG_CONSTTIME); + } else + prk = priv_key; - if ((dh->flags & DH_FLAG_NO_EXP_CONSTTIME) == 0) - { - BN_init(&local_prk); - prk = &local_prk; - BN_with_flags(prk, priv_key, BN_FLG_CONSTTIME); - } - else - prk = priv_key; + if (!dh->meth->bn_mod_exp(dh, pub_key, dh->g, prk, dh->p, ctx, mont)) + goto err; + } - if (!dh->meth->bn_mod_exp(dh, pub_key, dh->g, prk, dh->p, ctx, mont)) goto err; - } - - dh->pub_key=pub_key; - dh->priv_key=priv_key; - ok=1; -err: - if (ok != 1) - DHerr(DH_F_GENERATE_KEY,ERR_R_BN_LIB); + dh->pub_key = pub_key; + dh->priv_key = priv_key; + ok = 1; + err: + if (ok != 1) + DHerr(DH_F_GENERATE_KEY, ERR_R_BN_LIB); - if ((pub_key != NULL) && (dh->pub_key == NULL)) BN_free(pub_key); - if ((priv_key != NULL) && (dh->priv_key == NULL)) BN_free(priv_key); - BN_CTX_free(ctx); - return(ok); - } + if ((pub_key != NULL) && (dh->pub_key == NULL)) + BN_free(pub_key); + if ((priv_key != NULL) && (dh->priv_key == NULL)) + BN_free(priv_key); + BN_CTX_free(ctx); + return (ok); +} static int compute_key(unsigned char *key, const BIGNUM *pub_key, DH *dh) - { - BN_CTX *ctx=NULL; - BN_MONT_CTX *mont=NULL; - BIGNUM *tmp; - int ret= -1; - int check_result; +{ + BN_CTX *ctx = NULL; + BN_MONT_CTX *mont = NULL; + BIGNUM *tmp; + int ret = -1; + int check_result; - if (BN_num_bits(dh->p) > OPENSSL_DH_MAX_MODULUS_BITS) - { - DHerr(DH_F_COMPUTE_KEY,DH_R_MODULUS_TOO_LARGE); - goto err; - } + if (BN_num_bits(dh->p) > OPENSSL_DH_MAX_MODULUS_BITS) { + DHerr(DH_F_COMPUTE_KEY, DH_R_MODULUS_TOO_LARGE); + goto err; + } - ctx = BN_CTX_new(); - if (ctx == NULL) goto err; - BN_CTX_start(ctx); - tmp = BN_CTX_get(ctx); - - if (dh->priv_key == NULL) - { - DHerr(DH_F_COMPUTE_KEY,DH_R_NO_PRIVATE_VALUE); - goto err; - } + ctx = BN_CTX_new(); + if (ctx == NULL) + goto err; + BN_CTX_start(ctx); + tmp = BN_CTX_get(ctx); - if (dh->flags & DH_FLAG_CACHE_MONT_P) - { - mont = BN_MONT_CTX_set_locked(&dh->method_mont_p, - CRYPTO_LOCK_DH, dh->p, ctx); - if ((dh->flags & DH_FLAG_NO_EXP_CONSTTIME) == 0) - { - /* XXX */ - BN_set_flags(dh->priv_key, BN_FLG_CONSTTIME); - } - if (!mont) - goto err; - } + if (dh->priv_key == NULL) { + DHerr(DH_F_COMPUTE_KEY, DH_R_NO_PRIVATE_VALUE); + goto err; + } - if (!DH_check_pub_key(dh, pub_key, &check_result) || check_result) - { - DHerr(DH_F_COMPUTE_KEY,DH_R_INVALID_PUBKEY); - goto err; - } + if (dh->flags & DH_FLAG_CACHE_MONT_P) { + mont = BN_MONT_CTX_set_locked(&dh->method_mont_p, + CRYPTO_LOCK_DH, dh->p, ctx); + if ((dh->flags & DH_FLAG_NO_EXP_CONSTTIME) == 0) { + /* XXX */ + BN_set_flags(dh->priv_key, BN_FLG_CONSTTIME); + } + if (!mont) + goto err; + } - if (!dh->meth->bn_mod_exp(dh, tmp, pub_key, dh->priv_key,dh->p,ctx,mont)) - { - DHerr(DH_F_COMPUTE_KEY,ERR_R_BN_LIB); - goto err; - } + if (!DH_check_pub_key(dh, pub_key, &check_result) || check_result) { + DHerr(DH_F_COMPUTE_KEY, DH_R_INVALID_PUBKEY); + goto err; + } - ret=BN_bn2bin(tmp,key); -err: - if (ctx != NULL) - { - BN_CTX_end(ctx); - BN_CTX_free(ctx); - } - return(ret); - } + if (!dh-> + meth->bn_mod_exp(dh, tmp, pub_key, dh->priv_key, dh->p, ctx, mont)) { + DHerr(DH_F_COMPUTE_KEY, ERR_R_BN_LIB); + goto err; + } -static int dh_bn_mod_exp(const DH *dh, BIGNUM *r, - const BIGNUM *a, const BIGNUM *p, - const BIGNUM *m, BN_CTX *ctx, - BN_MONT_CTX *m_ctx) - { - /* If a is only one word long and constant time is false, use the faster - * exponenentiation function. - */ - if (a->top == 1 && ((dh->flags & DH_FLAG_NO_EXP_CONSTTIME) != 0)) - { - BN_ULONG A = a->d[0]; - return BN_mod_exp_mont_word(r,A,p,m,ctx,m_ctx); - } - else - return BN_mod_exp_mont(r,a,p,m,ctx,m_ctx); - } + ret = BN_bn2bin(tmp, key); + err: + if (ctx != NULL) { + BN_CTX_end(ctx); + BN_CTX_free(ctx); + } + return (ret); +} +static int dh_bn_mod_exp(const DH *dh, BIGNUM *r, + const BIGNUM *a, const BIGNUM *p, + const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx) +{ + /* + * If a is only one word long and constant time is false, use the faster + * exponenentiation function. + */ + if (a->top == 1 && ((dh->flags & DH_FLAG_NO_EXP_CONSTTIME) != 0)) { + BN_ULONG A = a->d[0]; + return BN_mod_exp_mont_word(r, A, p, m, ctx, m_ctx); + } else + return BN_mod_exp_mont(r, a, p, m, ctx, m_ctx); +} static int dh_init(DH *dh) - { - dh->flags |= DH_FLAG_CACHE_MONT_P; - return(1); - } +{ + dh->flags |= DH_FLAG_CACHE_MONT_P; + return (1); +} static int dh_finish(DH *dh) - { - if(dh->method_mont_p) - BN_MONT_CTX_free(dh->method_mont_p); - return(1); - } +{ + if (dh->method_mont_p) + BN_MONT_CTX_free(dh->method_mont_p); + return (1); +} |