Initial support for DSA_METHOD...

[openssl.git] / crypto / dsa / dsa_vrf.c

diff --git a/crypto/dsa/dsa_vrf.c b/crypto/dsa/dsa_vrf.c
index 71cefbeaa47d36ad4701a21b57713f87b1386e66..03277f80fdc6bc17c5412d640de8b75554cb265b 100644 (file)
--- a/crypto/dsa/dsa_vrf.c
+++ b/crypto/dsa/dsa_vrf.c
@@ -56,120 +56,39 @@
  * [including the GNU Public Licence.]
  */
 
-/* Origional version from Steven Schoch <schoch@sheba.arc.nasa.gov> */
+/* 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"
+#include <openssl/bn.h>
+#include <openssl/dsa.h>
+#include <openssl/rand.h>
+#include <openssl/asn1.h>
+#include <openssl/asn1_mac.h>
+
+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);
+       }
 
 /* data has already been hashed (probably with SHA or SHA-1). */
 /* returns
- *      1: correct signature
- *      0: incorrect signature
- *     -1: error
+ *      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;
-       {
-       /* The next 3 are used by the M_ASN1 macros */
-       long length=siglen;
-       ASN1_CTX c;
-       unsigned char **pp= &sigbuf;
-       BN_CTX *ctx;
-       BIGNUM r,u1,u2,t1;
-       ASN1_INTEGER *bs=NULL;
-       BN_MONT_CTX *mont=NULL;
-       int ret = -1;
-
-       if ((ctx=BN_CTX_new()) == NULL) goto err;
-       if ((mont=BN_MONT_CTX_new()) == NULL) goto err;
-
-       BN_init(&u1);
-       BN_init(&u2);
-       BN_init(&r);
-       BN_init(&t1);
-
-       M_ASN1_D2I_Init();
-       M_ASN1_D2I_start_sequence();
-        M_ASN1_D2I_get(bs,d2i_ASN1_INTEGER);
-        if ((BN_bin2bn(bs->data,bs->length,&r)) == NULL) goto err_bn;
-        M_ASN1_D2I_get(bs,d2i_ASN1_INTEGER);
-        if ((BN_bin2bn(bs->data,bs->length,&u1)) == NULL) goto err_bn;
-       if (!asn1_Finish(&c)) goto err;
-
-       /* Calculate W = inv(S) mod Q
-        * save W in u2 */
-       if ((BN_mod_inverse(&u2,&u1,dsa->q,ctx)) == NULL) goto err_bn;
-
-       /* save M in u1 */
-       if (BN_bin2bn(dgst,dgst_len,&u1) == NULL) goto err_bn;
-
-       /* u1 = M * w mod q */
-       if (!BN_mod_mul(&u1,&u1,&u2,dsa->q,ctx)) goto err_bn;
-
-       /* u2 = r * w mod q */
-       if (!BN_mod_mul(&u2,&r,&u2,dsa->q,ctx)) goto err_bn;
-
-       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
+int DSA_verify(int type, const unsigned char *dgst, int dgst_len,
+            unsigned char *sigbuf, int siglen, DSA *dsa)
        {
-       BIGNUM t2;
+       DSA_SIG *s;
+       int ret=-1;
 
-       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_bn;
-       /* let t2 = y ^ u2 mod p */
-       if (!BN_mod_exp_mont(&t2,dsa->pub_key,&u2,dsa->p,ctx,mont)) goto err_bn;
-       /* 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_bn;
-#else
-       {
-       if (!BN_mod_exp2_mont(&t1,dsa->g,&u1,dsa->pub_key,&u2,dsa->p,ctx,mont))
-               goto err_bn;
-       /* BN_copy(&u1,&t1); */
-       /* let u1 = u1 mod q */
-       if (!BN_mod(&u1,&t1,dsa->q,ctx)) goto err_bn;
-       }
-#endif
-       /* V is now in u1.  If the signature is correct, it will be
-        * equal to R. */
-       ret=(BN_ucmp(&u1, &r) == 0);
-       if (0)
-               {
-err: /* ASN1 error */
-               DSAerr(DSA_F_DSA_VERIFY,c.error);
-               }
-       if (0)
-               {
-err_bn: /* BN error */
-               DSAerr(DSA_F_DSA_VERIFY,ERR_R_BN_LIB);
-               }
-       if (ctx != NULL) BN_CTX_free(ctx);
-       BN_free(&r);
-       BN_free(&u1);
-       BN_free(&u2);
-       BN_free(&t1);
-       if (bs != NULL) ASN1_BIT_STRING_free(bs);
+       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);
        }