1 files changed, 66 insertions, 54 deletions

diff --git a/src/lib/libcrypto/dsa/dsa_ossl.c b/src/lib/libcrypto/dsa/dsa_ossl.c
index 12509a7083..75ff7cc4af 100644
--- a/src/lib/libcrypto/dsa/dsa_ossl.c
+++ b/src/lib/libcrypto/dsa/dsa_ossl.c
@@ -65,33 +65,63 @@
 #include <openssl/rand.h>
 #include <openssl/asn1.h>
 
-#ifndef OPENSSL_FIPS
 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);
 static int dsa_do_verify(const unsigned char *dgst, int dgst_len, DSA_SIG *sig,
                   DSA *dsa);
 static int dsa_init(DSA *dsa);
 static int dsa_finish(DSA *dsa);
-static int dsa_mod_exp(DSA *dsa, BIGNUM *rr, BIGNUM *a1, BIGNUM *p1,
-                BIGNUM *a2, BIGNUM *p2, BIGNUM *m, BN_CTX *ctx,
-                BN_MONT_CTX *in_mont);
-static int dsa_bn_mod_exp(DSA *dsa, BIGNUM *r, BIGNUM *a, const BIGNUM *p,
-                                const BIGNUM *m, BN_CTX *ctx,
-                                BN_MONT_CTX *m_ctx);
 
 static DSA_METHOD openssl_dsa_meth = {
 "OpenSSL DSA method",
 dsa_do_sign,
 dsa_sign_setup,
 dsa_do_verify,
-dsa_mod_exp,
-dsa_bn_mod_exp,
+NULL, /* dsa_mod_exp, */
+NULL, /* dsa_bn_mod_exp, */
 dsa_init,
 dsa_finish,
 0,
+NULL,
+NULL,
 NULL
 };
 
+/* These macro wrappers replace attempts to use the dsa_mod_exp() and
+ * bn_mod_exp() handlers in the DSA_METHOD structure. We avoid the problem of
+ * having a the macro work as an expression by bundling an "err_instr". So;
+ * 
+ *     if (!dsa->meth->bn_mod_exp(dsa, r,dsa->g,&k,dsa->p,ctx,
+ *                 dsa->method_mont_p)) goto err;
+ *
+ * can be replaced by;
+ *
+ *     DSA_BN_MOD_EXP(goto err, dsa, r, dsa->g, &k, dsa->p, ctx,
+ *                 dsa->method_mont_p);
+ */
+
+#define DSA_MOD_EXP(err_instr,dsa,rr,a1,p1,a2,p2,m,ctx,in_mont) \
+        do { \
+        int _tmp_res53; \
+        if((dsa)->meth->dsa_mod_exp) \
+                _tmp_res53 = (dsa)->meth->dsa_mod_exp((dsa), (rr), (a1), (p1), \
+                                (a2), (p2), (m), (ctx), (in_mont)); \
+        else \
+                _tmp_res53 = BN_mod_exp2_mont((rr), (a1), (p1), (a2), (p2), \
+                                (m), (ctx), (in_mont)); \
+        if(!_tmp_res53) err_instr; \
+        } while(0)
+#define DSA_BN_MOD_EXP(err_instr,dsa,r,a,p,m,ctx,m_ctx) \
+        do { \
+        int _tmp_res53; \
+        if((dsa)->meth->bn_mod_exp) \
+                _tmp_res53 = (dsa)->meth->bn_mod_exp((dsa), (r), (a), (p), \
+                                (m), (ctx), (m_ctx)); \
+        else \
+                _tmp_res53 = BN_mod_exp_mont((r), (a), (p), (m), (ctx), (m_ctx)); \
+        if(!_tmp_res53) err_instr; \
+        } while(0)
+
 const DSA_METHOD *DSA_OpenSSL(void)
 {
         return &openssl_dsa_meth;
@@ -199,12 +229,12 @@ static int dsa_sign_setup(DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp, BIGNUM **rp)
         while (BN_is_zero(&k));
         if ((dsa->flags & DSA_FLAG_NO_EXP_CONSTTIME) == 0)
                 {
-                BN_set_flags(&k, BN_FLG_EXP_CONSTTIME);
+                BN_set_flags(&k, BN_FLG_CONSTTIME);
                 }
 
         if (dsa->flags & DSA_FLAG_CACHE_MONT_P)
                 {
-                if (!BN_MONT_CTX_set_locked((BN_MONT_CTX **)&dsa->method_mont_p,
+                if (!BN_MONT_CTX_set_locked(&dsa->method_mont_p,
                                                 CRYPTO_LOCK_DSA,
                                                 dsa->p, ctx))
                         goto err;
@@ -234,8 +264,8 @@ static int dsa_sign_setup(DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp, BIGNUM **rp)
                 {
                 K = &k;
                 }
-        if (!dsa->meth->bn_mod_exp(dsa, r,dsa->g,K,dsa->p,ctx,
-                (BN_MONT_CTX *)dsa->method_mont_p)) goto err;
+        DSA_BN_MOD_EXP(goto err, dsa, r, dsa->g, K, dsa->p, ctx,
+                        dsa->method_mont_p);
         if (!BN_mod(r,r,dsa->q,ctx)) goto err;
 
         /* Compute  part of 's = inv(k) (m + xr) mod q' */
@@ -274,18 +304,32 @@ static int dsa_do_verify(const unsigned char *dgst, int dgst_len, DSA_SIG *sig,
                 return -1;
                 }
 
+        if (BN_num_bits(dsa->q) != 160)
+                {
+                DSAerr(DSA_F_DSA_DO_VERIFY,DSA_R_BAD_Q_VALUE);
+                return -1;
+                }
+
+        if (BN_num_bits(dsa->p) > OPENSSL_DSA_MAX_MODULUS_BITS)
+                {
+                DSAerr(DSA_F_DSA_DO_VERIFY,DSA_R_MODULUS_TOO_LARGE);
+                return -1;
+                }
+
         BN_init(&u1);
         BN_init(&u2);
         BN_init(&t1);
 
         if ((ctx=BN_CTX_new()) == NULL) goto err;
 
-        if (BN_is_zero(sig->r) || sig->r->neg || BN_ucmp(sig->r, dsa->q) >= 0)
+        if (BN_is_zero(sig->r) || BN_is_negative(sig->r) ||
+            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)
+        if (BN_is_zero(sig->s) || BN_is_negative(sig->s) ||
+            BN_ucmp(sig->s, dsa->q) >= 0)
                 {
                 ret = 0;
                 goto err;
@@ -307,43 +351,25 @@ static int dsa_do_verify(const unsigned char *dgst, int dgst_len, DSA_SIG *sig,
 
         if (dsa->flags & DSA_FLAG_CACHE_MONT_P)
                 {
-                mont = BN_MONT_CTX_set_locked(
-                                        (BN_MONT_CTX **)&dsa->method_mont_p,
+                mont = BN_MONT_CTX_set_locked(&dsa->method_mont_p,
                                         CRYPTO_LOCK_DSA, dsa->p, ctx);
                 if (!mont)
                         goto err;
                 }
 
-#if 0
-        {
-        BIGNUM t2;
-
-        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;
-        /* let t2 = y ^ u2 mod p */
-        if (!BN_mod_exp_mont(&t2,dsa->pub_key,&u2,dsa->p,ctx,mont)) goto err;
-        /* 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;
-#else
-        {
-        if (!dsa->meth->dsa_mod_exp(dsa, &t1,dsa->g,&u1,dsa->pub_key,&u2,
-                                                dsa->p,ctx,mont)) goto err;
+
+        DSA_MOD_EXP(goto err, dsa, &t1, dsa->g, &u1, dsa->pub_key, &u2, dsa->p, ctx, mont);
         /* BN_copy(&u1,&t1); */
         /* let u1 = u1 mod q */
         if (!BN_mod(&u1,&t1,dsa->q,ctx)) goto err;
-        }
-#endif
+
         /* V is now in u1.  If the signature is correct, it will be
          * equal to R. */
         ret=(BN_ucmp(&u1, sig->r) == 0);
 
         err:
+        /* XXX: surely this is wrong - if ret is 0, it just didn't verify;
+           there is no error in BN. Test should be ret == -1 (Ben) */
         if (ret != 1) DSAerr(DSA_F_DSA_DO_VERIFY,ERR_R_BN_LIB);
         if (ctx != NULL) BN_CTX_free(ctx);
         BN_free(&u1);
@@ -361,21 +387,7 @@ static int dsa_init(DSA *dsa)
 static int dsa_finish(DSA *dsa)
 {
         if(dsa->method_mont_p)
-                BN_MONT_CTX_free((BN_MONT_CTX *)dsa->method_mont_p);
+                BN_MONT_CTX_free(dsa->method_mont_p);
         return(1);
 }
 
-static int dsa_mod_exp(DSA *dsa, BIGNUM *rr, BIGNUM *a1, BIGNUM *p1,
-                BIGNUM *a2, BIGNUM *p2, BIGNUM *m, BN_CTX *ctx,
-                BN_MONT_CTX *in_mont)
-{
-        return BN_mod_exp2_mont(rr, a1, p1, a2, p2, m, ctx, in_mont);
-}
-        
-static int dsa_bn_mod_exp(DSA *dsa, BIGNUM *r, BIGNUM *a, const BIGNUM *p,
-                                const BIGNUM *m, BN_CTX *ctx,
-                                BN_MONT_CTX *m_ctx)
-{
-        return BN_mod_exp_mont(r, a, p, m, ctx, m_ctx);
-}
-#endif