diff options
Diffstat (limited to 'crypto/bn/bn_blind.c')
| -rw-r--r-- | crypto/bn/bn_blind.c | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/crypto/bn/bn_blind.c b/crypto/bn/bn_blind.c new file mode 100644 index 0000000000..a7b34f0bf0 --- /dev/null +++ b/crypto/bn/bn_blind.c @@ -0,0 +1,143 @@ +/* crypto/bn/bn_blind.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 "bn_lcl.h" + +BN_BLINDING *BN_BLINDING_new(A,Ai,mod) +BIGNUM *A; +BIGNUM *Ai; +BIGNUM *mod; + { + BN_BLINDING *ret=NULL; + + if ((ret=(BN_BLINDING *)Malloc(sizeof(BN_BLINDING))) == NULL) + BNerr(BN_F_BN_BLINDING_NEW,ERR_R_MALLOC_FAILURE); + memset(ret,0,sizeof(BN_BLINDING)); + if ((ret->A=BN_new()) == NULL) goto err; + if ((ret->Ai=BN_new()) == NULL) goto err; + if (!BN_copy(ret->A,A)) goto err; + if (!BN_copy(ret->Ai,Ai)) goto err; + ret->mod=mod; + return(ret); +err: + if (ret != NULL) BN_BLINDING_free(ret); + return(ret); + } + +void BN_BLINDING_free(r) +BN_BLINDING *r; + { + if (r->A != NULL) BN_free(r->A ); + if (r->Ai != NULL) BN_free(r->Ai); + Free(r); + } + +int BN_BLINDING_update(b,ctx) +BN_BLINDING *b; +BN_CTX *ctx; + { + int ret=0; + + if ((b->A == NULL) || (b->Ai == NULL)) + { + BNerr(BN_F_BN_BLINDING_UPDATE,BN_R_NOT_INITALISED); + goto err; + } + + if (!BN_mod_mul(b->A,b->A,b->A,b->mod,ctx)) goto err; + if (!BN_mod_mul(b->Ai,b->Ai,b->Ai,b->mod,ctx)) goto err; + + ret=1; +err: + return(ret); + } + +int BN_BLINDING_convert(n,b,ctx) +BIGNUM *n; +BN_BLINDING *b; +BN_CTX *ctx; + { + if ((b->A == NULL) || (b->Ai == NULL)) + { + BNerr(BN_F_BN_BLINDING_CONVERT,BN_R_NOT_INITALISED); + return(0); + } + return(BN_mod_mul(n,n,b->A,b->mod,ctx)); + } + +int BN_BLINDING_invert(n,b,ctx) +BIGNUM *n; +BN_BLINDING *b; +BN_CTX *ctx; + { + int ret; + if ((b->A == NULL) || (b->Ai == NULL)) + { + BNerr(BN_F_BN_BLINDING_INVERT,BN_R_NOT_INITALISED); + return(0); + } + if ((ret=BN_mod_mul(n,n,b->Ai,b->mod,ctx)) >= 0) + { + if (!BN_BLINDING_update(b,ctx)) + return(0); + } + return(ret); + } + |