From 15b5d84f9da2ce4bfae8580e56e34a859f74ad71 Mon Sep 17 00:00:00 2001
From: markus <>
Date: Thu, 5 Sep 2002 12:51:50 +0000
Subject: import openssl-0.9.7-beta1

---
 src/lib/libcrypto/dsa/dsa_ossl.c | 39 +++++++++++++++++++++++++++++++--------
 1 file changed, 31 insertions(+), 8 deletions(-)

(limited to 'src/lib/libcrypto/dsa/dsa_ossl.c')

diff --git a/src/lib/libcrypto/dsa/dsa_ossl.c b/src/lib/libcrypto/dsa/dsa_ossl.c
index b51cf6ad8d..37dd5fc994 100644
--- a/src/lib/libcrypto/dsa/dsa_ossl.c
+++ b/src/lib/libcrypto/dsa/dsa_ossl.c
@@ -64,6 +64,7 @@
 #include <openssl/dsa.h>
 #include <openssl/rand.h>
 #include <openssl/asn1.h>
+#include <openssl/engine.h>
 
 static DSA_SIG *dsa_do_sign(const unsigned char *dgst, int dlen, DSA *dsa);
 static int dsa_sign_setup(DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp, BIGNUM **rp);
@@ -91,7 +92,7 @@ dsa_finish,
 NULL
 };
 
-DSA_METHOD *DSA_OpenSSL(void)
+const DSA_METHOD *DSA_OpenSSL(void)
 {
 	return &openssl_dsa_meth;
 }
@@ -105,6 +106,11 @@ static DSA_SIG *dsa_do_sign(const unsigned char *dgst, int dlen, DSA *dsa)
 	int i,reason=ERR_R_BN_LIB;
 	DSA_SIG *ret=NULL;
 
+	if (!dsa->p || !dsa->q || !dsa->g)
+		{
+		reason=DSA_R_MISSING_PARAMETERS;
+		goto err;
+		}
 	BN_init(&m);
 	BN_init(&xr);
 	s=BN_new();
@@ -167,6 +173,11 @@ static int dsa_sign_setup(DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp, BIGNUM **rp)
 	BIGNUM k,*kinv=NULL,*r=NULL;
 	int ret=0;
 
+	if (!dsa->p || !dsa->q || !dsa->g)
+		{
+		DSAerr(DSA_F_DSA_SIGN_SETUP,DSA_R_MISSING_PARAMETERS);
+		return 0;
+		}
 	if (ctx_in == NULL)
 		{
 		if ((ctx=BN_CTX_new()) == NULL) goto err;
@@ -179,13 +190,9 @@ static int dsa_sign_setup(DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp, BIGNUM **rp)
 	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;
-		}
+	do
+		if (!BN_rand_range(&k, dsa->q)) goto err;
+	while (BN_is_zero(&k));
 
 	if ((dsa->method_mont_p == NULL) && (dsa->flags & DSA_FLAG_CACHE_MONT_P))
 		{
@@ -228,12 +235,28 @@ static int dsa_do_verify(const unsigned char *dgst, int dgst_len, DSA_SIG *sig,
 	BIGNUM u1,u2,t1;
 	BN_MONT_CTX *mont=NULL;
 	int ret = -1;
+	if (!dsa->p || !dsa->q || !dsa->g)
+		{
+		DSAerr(DSA_F_DSA_DO_VERIFY,DSA_R_MISSING_PARAMETERS);
+		return -1;
+		}
 
 	if ((ctx=BN_CTX_new()) == NULL) goto err;
 	BN_init(&u1);
 	BN_init(&u2);
 	BN_init(&t1);
 
+	if (BN_is_zero(sig->r) || sig->r->neg || BN_ucmp(sig->r, dsa->q) >= 0)
+		{
+		ret = 0;
+		goto err;
+		}
+	if (BN_is_zero(sig->s) || sig->s->neg || BN_ucmp(sig->s, dsa->q) >= 0)
+		{
+		ret = 0;
+		goto err;
+		}
+
 	/* Calculate W = inv(S) mod Q
 	 * save W in u2 */
 	if ((BN_mod_inverse(&u2,sig->s,dsa->q,ctx)) == NULL) goto err;
-- 
cgit v1.2.3-55-g6feb