* [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;
-
- 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,
+ const 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);
}