diff options
author | Parménides GV <parmegv@sdf.org> | 2014-04-09 17:07:48 +0200 |
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committer | Parménides GV <parmegv@sdf.org> | 2014-04-09 17:15:17 +0200 |
commit | 51ff5a18f1f074e27e97d822745551a7e8fa068d (patch) | |
tree | 402e7dd42778a218635bb29a4c2dff93ea7f6525 /app/openssl/crypto/dh/dh_key.c | |
parent | 910b0e1746ab3f63e63808b198ad51fec5b635e5 (diff) | |
parent | b5ba0abc1610dd4bf573ebcabc5e8f6ab0c9528f (diff) |
Merge branch 'feature/implement-gradle-build-system-#4676' into develop
Diffstat (limited to 'app/openssl/crypto/dh/dh_key.c')
-rw-r--r-- | app/openssl/crypto/dh/dh_key.c | 263 |
1 files changed, 263 insertions, 0 deletions
diff --git a/app/openssl/crypto/dh/dh_key.c b/app/openssl/crypto/dh/dh_key.c new file mode 100644 index 00000000..e7db4403 --- /dev/null +++ b/app/openssl/crypto/dh/dh_key.c @@ -0,0 +1,263 @@ +/* crypto/dh/dh_key.c */ +/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) + * All rights reserved. + * + * 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: + * 1. Redistributions of source code must retain the copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * "This product includes cryptographic software written by + * 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 + * 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 + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * 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 + * [including the GNU Public Licence.] + */ + +#include <stdio.h> +#include "cryptlib.h" +#include <openssl/bn.h> +#include <openssl/rand.h> +#include <openssl/dh.h> + +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); +static int dh_init(DH *dh); +static int dh_finish(DH *dh); + +int DH_generate_key(DH *dh) + { + return dh->meth->generate_key(dh); + } + +int DH_compute_key(unsigned char *key, const BIGNUM *pub_key, DH *dh) + { + return dh->meth->compute_key(key, pub_key, dh); + } + +static DH_METHOD dh_ossl = { +"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; +} + +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; + + 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->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 (generate_new_key) + { + l = dh->length ? dh->length : BN_num_bits(dh->p)-1; /* secret exponent length */ + if (!BN_rand(priv_key, l, 0, 0)) goto err; + } + + { + 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->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); + + 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; + + 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; + } + + 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_check_pub_key(dh, pub_key, &check_result) || check_result) + { + DHerr(DH_F_COMPUTE_KEY,DH_R_INVALID_PUBKEY); + 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; + } + + 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); + } + +static int dh_finish(DH *dh) + { + if(dh->method_mont_p) + BN_MONT_CTX_free(dh->method_mont_p); + return(1); + } |