-/* crypto/dsa/dsa_sign.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"
-
-DSA_SIG * DSA_do_sign(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;
+#include "internal/cryptlib.h"
+#include <openssl/dsa.h>
+#include <openssl/rand.h>
+#include <openssl/bn.h>
- /* 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);
- return(ret);
- }
-
-/* data has already been hashed (probably with SHA or SHA-1). */
-
-/* unsigned char *sig: out */
-/* unsigned int *siglen: out */
-int DSA_sign(int type, unsigned char *dgst, int dlen, unsigned char *sig,
- unsigned int *siglen, DSA *dsa)
- {
- DSA_SIG *s;
- s=DSA_do_sign(dgst,dlen,dsa);
- if (s == NULL)
- {
- *siglen=0;
- return(0);
- }
- *siglen=i2d_DSA_SIG(s,&sig);
- DSA_SIG_free(s);
- return(1);
- }
+DSA_SIG *DSA_do_sign(const unsigned char *dgst, int dlen, DSA *dsa)
+{
+ return dsa->meth->dsa_do_sign(dgst, dlen, dsa);
+}
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);
+}