diff options
author | Dr. Stephen Henson <steve@openssl.org> | 1999-08-22 17:57:38 +0000 |
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committer | Dr. Stephen Henson <steve@openssl.org> | 1999-08-22 17:57:38 +0000 |
commit | c0711f7f0fc026ab87fe6607bb5136ab790e2334 (patch) | |
tree | 8db64939a0e30e6c1d6375b13de3e9190d00c13f /crypto/dsa/dsa_sign.c | |
parent | 8484721adb154f47de28e64d581b40adca6c5e68 (diff) |
Initial support for DSA_METHOD...
Diffstat (limited to 'crypto/dsa/dsa_sign.c')
-rw-r--r-- | crypto/dsa/dsa_sign.c | 123 |
1 files changed, 2 insertions, 121 deletions
diff --git a/crypto/dsa/dsa_sign.c b/crypto/dsa/dsa_sign.c index 774c161964..89205026f0 100644 --- a/crypto/dsa/dsa_sign.c +++ b/crypto/dsa/dsa_sign.c @@ -67,73 +67,9 @@ DSA_SIG * DSA_do_sign(const unsigned char *dgst, int dlen, DSA *dsa) { - BIGNUM *kinv=NULL,*r=NULL,*s=NULL; - BIGNUM m; - BIGNUM xr; - BN_CTX *ctx=NULL; - int i,reason=ERR_R_BN_LIB; - DSA_SIG *ret=NULL; - - BN_init(&m); - BN_init(&xr); - s=BN_new(); - if (s == NULL) goto err; - - i=BN_num_bytes(dsa->q); /* should be 20 */ - if ((dlen > i) || (dlen > 50)) - { - reason=DSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE; - goto err; - } - - ctx=BN_CTX_new(); - if (ctx == NULL) goto err; - - if ((dsa->kinv == NULL) || (dsa->r == NULL)) - { - if (!DSA_sign_setup(dsa,ctx,&kinv,&r)) goto err; - } - else - { - kinv=dsa->kinv; - dsa->kinv=NULL; - r=dsa->r; - dsa->r=NULL; - } - - if (BN_bin2bn(dgst,dlen,&m) == NULL) goto err; - - /* Compute s = inv(k) (m + xr) mod q */ - if (!BN_mod_mul(&xr,dsa->priv_key,r,dsa->q,ctx)) goto err;/* s = xr */ - if (!BN_add(s, &xr, &m)) goto err; /* s = m + xr */ - if (BN_cmp(s,dsa->q) > 0) - BN_sub(s,s,dsa->q); - if (!BN_mod_mul(s,s,kinv,dsa->q,ctx)) goto err; - - ret=DSA_SIG_new(); - if (ret == NULL) goto err; - ret->r = r; - ret->s = s; - -err: - if (!ret) - { - DSAerr(DSA_F_DSA_DO_SIGN,reason); - BN_free(r); - BN_free(s); - } - if (ctx != NULL) BN_CTX_free(ctx); - BN_clear_free(&m); - BN_clear_free(&xr); - if (kinv != NULL) /* dsa->kinv is NULL now if we used it */ - BN_clear_free(kinv); - return(ret); + return dsa->meth->dsa_do_sign(dgst, dlen, dsa); } -/* data has already been hashed (probably with SHA or SHA-1). */ - -/* unsigned char *sig: out */ -/* unsigned int *siglen: out */ int DSA_sign(int type, const unsigned char *dgst, int dlen, unsigned char *sig, unsigned int *siglen, DSA *dsa) { @@ -151,61 +87,6 @@ int DSA_sign(int type, const unsigned char *dgst, int dlen, unsigned char *sig, int DSA_sign_setup(DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp, BIGNUM **rp) { - BN_CTX *ctx; - BIGNUM k,*kinv=NULL,*r=NULL; - int ret=0; - - if (ctx_in == NULL) - { - if ((ctx=BN_CTX_new()) == NULL) goto err; - } - else - ctx=ctx_in; - - BN_init(&k); - if ((r=BN_new()) == NULL) goto err; - kinv=NULL; - - /* Get random k */ - for (;;) - { - if (!BN_rand(&k, BN_num_bits(dsa->q), 1, 0)) goto err; - if (BN_cmp(&k,dsa->q) >= 0) - BN_sub(&k,&k,dsa->q); - if (!BN_is_zero(&k)) break; - } - - 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; - } - - /* Compute r = (g^k mod p) mod q */ - if (!BN_mod_exp_mont(r,dsa->g,&k,dsa->p,ctx, - (BN_MONT_CTX *)dsa->method_mont_p)) goto err; - if (!BN_mod(r,r,dsa->q,ctx)) goto err; - - /* Compute part of 's = inv(k) (m + xr) mod q' */ - if ((kinv=BN_mod_inverse(NULL,&k,dsa->q,ctx)) == NULL) goto err; - - if (*kinvp != NULL) BN_clear_free(*kinvp); - *kinvp=kinv; - kinv=NULL; - if (*rp != NULL) BN_clear_free(*rp); - *rp=r; - ret=1; -err: - if (!ret) - { - DSAerr(DSA_F_DSA_SIGN_SETUP,ERR_R_BN_LIB); - if (kinv != NULL) BN_clear_free(kinv); - if (r != NULL) BN_clear_free(r); - } - if (ctx_in == NULL) BN_CTX_free(ctx); - if (kinv != NULL) BN_clear_free(kinv); - BN_clear_free(&k); - return(ret); + return dsa->meth->dsa_sign_setup(dsa, ctx_in, kinvp, rp); } |