-/* crypto/dsa/dsa_vrf.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:
* 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
* 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
/* Original version from Steven Schoch <schoch@sheba.arc.nasa.gov> */
-#include <stdio.h>
-#include "cryptlib.h"
-#include "bn.h"
-#include "dsa.h"
-#include "rand.h"
-#include "asn1.h"
-#include "asn1_mac.h"
-
-int DSA_do_verify(dgst,dgst_len,sig,dsa)
-unsigned char *dgst;
-int dgst_len;
-DSA_SIG *sig;
-DSA *dsa;
- {
- BN_CTX *ctx;
- BIGNUM u1,u2,t1;
- BN_MONT_CTX *mont=NULL;
- int ret = -1;
-
- if ((ctx=BN_CTX_new()) == NULL) goto err;
- BN_init(&u1);
- BN_init(&u2);
- BN_init(&t1);
-
- /* Calculate W = inv(S) mod Q
- * save W in u2 */
- if ((BN_mod_inverse(&u2,sig->s,dsa->q,ctx)) == NULL) goto err;
-
- /* save M in u1 */
- if (BN_bin2bn(dgst,dgst_len,&u1) == NULL) goto err;
-
- /* u1 = M * w mod q */
- if (!BN_mod_mul(&u1,&u1,&u2,dsa->q,ctx)) goto err;
-
- /* u2 = r * w mod q */
- if (!BN_mod_mul(&u2,sig->r,&u2,dsa->q,ctx)) goto err;
-
- if ((dsa->method_mont_p == NULL) && (dsa->flags & DSA_FLAG_CACHE_MONT_P))
- {
- if ((dsa->method_mont_p=(char *)BN_MONT_CTX_new()) != NULL)
- if (!BN_MONT_CTX_set((BN_MONT_CTX *)dsa->method_mont_p,
- dsa->p,ctx)) goto err;
- }
- mont=(BN_MONT_CTX *)dsa->method_mont_p;
-
-#if 0
- {
- BIGNUM t2;
-
- BN_init(&t2);
- /* v = ( g^u1 * y^u2 mod p ) mod q */
- /* let t1 = g ^ u1 mod p */
- if (!BN_mod_exp_mont(&t1,dsa->g,&u1,dsa->p,ctx,mont)) goto err;
- /* let t2 = y ^ u2 mod p */
- if (!BN_mod_exp_mont(&t2,dsa->pub_key,&u2,dsa->p,ctx,mont)) goto err;
- /* let u1 = t1 * t2 mod p */
- if (!BN_mod_mul(&u1,&t1,&t2,dsa->p,ctx)) goto err_bn;
- BN_free(&t2);
- }
- /* let u1 = u1 mod q */
- if (!BN_mod(&u1,&u1,dsa->q,ctx)) goto err;
-#else
- {
- if (!BN_mod_exp2_mont(&t1,dsa->g,&u1,dsa->pub_key,&u2,dsa->p,ctx,mont))
- goto err;
- /* BN_copy(&u1,&t1); */
- /* let u1 = u1 mod q */
- if (!BN_mod(&u1,&t1,dsa->q,ctx)) goto err;
- }
-#endif
- /* V is now in u1. If the signature is correct, it will be
- * equal to R. */
- ret=(BN_ucmp(&u1, sig->r) == 0);
-
- err:
- if (ret != 1) DSAerr(DSA_F_DSA_DO_VERIFY,ERR_R_BN_LIB);
- if (ctx != NULL) BN_CTX_free(ctx);
- BN_free(&u1);
- BN_free(&u2);
- BN_free(&t1);
- return(ret);
- }
-
-/* data has already been hashed (probably with SHA or SHA-1). */
-/* returns
- * 1: correct signature
- * 0: incorrect signature
- * -1: error
- */
-int DSA_verify(type,dgst,dgst_len,sigbuf,siglen,dsa)
-int type;
-unsigned char *dgst;
-int dgst_len;
-unsigned char *sigbuf;
-int siglen;
-DSA *dsa;
- {
- DSA_SIG *s;
- int ret=-1;
+#include "internal/cryptlib.h"
+#include <openssl/dsa.h>
- s = DSA_SIG_new();
- if (s == NULL) return(ret);
- if (d2i_DSA_SIG(&s,&sigbuf,siglen) == NULL) goto err;
- ret=DSA_do_verify(dgst,dgst_len,s,dsa);
-err:
- DSA_SIG_free(s);
- return(ret);
- }
+int DSA_do_verify(const unsigned char *dgst, int dgst_len, DSA_SIG *sig,
+ DSA *dsa)
+{
+ return dsa->meth->dsa_do_verify(dgst, dgst_len, sig, dsa);
+}
projects / openssl.git / blobdiff