Import of old SSLeay release: SSLeay 0.8.1b

1 files changed, 215 insertions, 0 deletions

diff --git a/crypto/dsa/dsa_sign.c b/crypto/dsa/dsa_sign.c
new file mode 100644
index 0000000000..ebb758feb5
--- /dev/null
+++ b/crypto/dsa/dsa_sign.c
@@ -0,0 +1,215 @@
+/* crypto/dsa/dsa_sign.c */
+/* Copyright (C) 1995-1997 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:
+ * 1. Redistributions of source code must retain the copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *    "This product includes cryptographic software written by
+ *     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 
+ *    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
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * 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
+ * [including the GNU Public Licence.]
+ */
+
+/* Origional 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"
+
+/* data has already been hashed (probably with SHA or SHA-1). */
+/*	DSAerr(DSA_F_DSA_SIGN,DSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE); */
+
+int DSA_sign(type,dgst,dlen,sig,siglen,dsa)
+int type;
+unsigned char *dgst;
+int dlen;
+unsigned char *sig;	/* out */
+unsigned int *siglen;	/* out */
+DSA *dsa;
+	{
+	BIGNUM *kinv=NULL,*r=NULL;
+	BIGNUM *m=NULL;
+	BIGNUM *xr=NULL,*s=NULL;
+	BN_CTX *ctx=NULL;
+	unsigned char *p;
+	int i,len=0,ret=0,reason=ERR_R_BN_LIB;
+        ASN1_INTEGER rbs,sbs;
+	MS_STATIC unsigned char rbuf[50]; /* assuming r is 20 bytes +extra */
+	MS_STATIC unsigned char sbuf[50]; /* assuming s is 20 bytes +extra */
+
+	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;
+		}
+
+	m=BN_new();
+	xr=BN_new();
+	s=BN_new();
+	if (m == NULL || xr == NULL || s == NULL) goto err;
+
+	if (BN_bin2bn(dgst,dlen,m) == NULL) goto err;
+
+	/* Compute  s = inv(k) (m + xr) mod q */
+	if (!BN_mul(xr, dsa->priv_key, r)) goto err;	/* s = xr */
+	if (!BN_add(s, xr, m)) goto err;		/* s = m + xr */
+	if (!BN_mod_mul(s,s,kinv,dsa->q,ctx)) goto err;
+
+	/*
+	 * Now create a ASN.1 sequence of the integers R and S.
+	 */
+	rbs.data=rbuf;
+	sbs.data=sbuf;
+	rbs.type = V_ASN1_INTEGER;
+	sbs.type = V_ASN1_INTEGER;
+	rbs.length=BN_bn2bin(r,rbs.data);
+	sbs.length=BN_bn2bin(s,sbs.data);
+
+	len =i2d_ASN1_INTEGER(&rbs,NULL);
+	len+=i2d_ASN1_INTEGER(&sbs,NULL);
+
+	p=sig;
+	ASN1_put_object(&p,1,len,V_ASN1_SEQUENCE,V_ASN1_UNIVERSAL);
+	i2d_ASN1_INTEGER(&rbs,&p);
+	i2d_ASN1_INTEGER(&sbs,&p);
+	*siglen=(p-sig);
+	ret=1;
+err:
+	if (!ret) DSAerr(DSA_F_DSA_SIGN,reason);
+		
+#if 1 /* do the right thing :-) */
+	if (kinv != NULL) BN_clear_free(kinv);
+	if (r != NULL) BN_clear_free(r);
+#endif
+	if (ctx != NULL) BN_CTX_free(ctx);
+	if (m != NULL) BN_clear_free(m);
+	if (xr != NULL) BN_clear_free(xr);
+	if (s != NULL) BN_clear_free(s);
+	return(ret);
+	}
+
+int DSA_sign_setup(dsa,ctx_in,kinvp,rp)
+DSA *dsa;
+BN_CTX *ctx_in;
+BIGNUM **kinvp;
+BIGNUM **rp;
+	{
+	BN_CTX *ctx;
+	BIGNUM *k=NULL,*kinv=NULL,*r=NULL;
+	int ret=0;
+
+	if (ctx_in == NULL)
+		{
+		if ((ctx=BN_CTX_new()) == NULL) goto err;
+		}
+	else
+		ctx=ctx_in;
+
+	r=BN_new();
+	k=BN_new();
+	if ((r == NULL) || (k == NULL))
+		goto err;
+	kinv=NULL;
+
+	if (r == NULL) goto err;
+
+	/* 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;
+		}
+
+	/* Compute r = (g^k mod p) mod q */
+	if (!BN_mod_exp(r,dsa->g,k,dsa->p,ctx)) 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(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 (k != NULL) BN_clear_free(k);
+	if (kinv != NULL) BN_clear_free(kinv);
+	return(ret);
+	}
+