X-Git-Url: https://git.openssl.org/gitweb/?a=blobdiff_plain;f=crypto%2Fdh%2Fdh_key.c;h=670727798e8c6b18dd4979f10f2769405366286a;hb=de3333bae446a185180287382b8abf25c4bac228;hp=4e6a0fc0ef35a6ac6ee4c5797181b4b05a3f753e;hpb=13066cee601cb7b2d6980fbb7eba51db4b489ebd;p=openssl.git

diff --git a/crypto/dh/dh_key.c b/crypto/dh/dh_key.c
index 4e6a0fc0ef..670727798e 100644
--- a/crypto/dh/dh_key.c
+++ b/crypto/dh/dh_key.c
@@ -61,10 +61,12 @@
 #include <openssl/bn.h>
 #include <openssl/rand.h>
 #include <openssl/dh.h>
+#include <openssl/engine.h>
 
 static int generate_key(DH *dh);
-static int compute_key(unsigned char *key, BIGNUM *pub_key, DH *dh);
-static int dh_bn_mod_exp(DH *dh, BIGNUM *r, BIGNUM *a, const BIGNUM *p,
+static int compute_key(unsigned char *key, const BIGNUM *pub_key, DH *dh);
+static int dh_bn_mod_exp(const DH *dh, BIGNUM *r,
+			const BIGNUM *a, const BIGNUM *p,
 			const BIGNUM *m, BN_CTX *ctx,
 			BN_MONT_CTX *m_ctx);
 static int dh_init(DH *dh);
@@ -72,12 +74,12 @@ static int dh_finish(DH *dh);
 
 int DH_generate_key(DH *dh)
 	{
-	return dh->meth->generate_key(dh);
+	return ENGINE_get_DH(dh->engine)->generate_key(dh);
 	}
 
-int DH_compute_key(unsigned char *key, BIGNUM *pub_key, DH *dh)
+int DH_compute_key(unsigned char *key, const BIGNUM *pub_key, DH *dh)
 	{
-	return dh->meth->compute_key(key, pub_key, dh);
+	return ENGINE_get_DH(dh->engine)->compute_key(key, pub_key, dh);
 	}
 
 static DH_METHOD dh_ossl = {
@@ -91,7 +93,7 @@ dh_finish,
 NULL
 };
 
-DH_METHOD *DH_OpenSSL(void)
+const DH_METHOD *DH_OpenSSL(void)
 {
 	return &dh_ossl;
 }
@@ -99,24 +101,20 @@ DH_METHOD *DH_OpenSSL(void)
 static int generate_key(DH *dh)
 	{
 	int ok=0;
-	unsigned int i;
-	BN_CTX ctx;
+	int generate_new_key=0;
+	unsigned l;
+	BN_CTX *ctx;
 	BN_MONT_CTX *mont;
 	BIGNUM *pub_key=NULL,*priv_key=NULL;
 
-	BN_CTX_init(&ctx);
+	ctx = BN_CTX_new();
+	if (ctx == NULL) goto err;
 
 	if (dh->priv_key == NULL)
 		{
-		i=dh->length;
-		if (i == 0)
-			{
-			/* Make the number p-1 bits long */
-			i=BN_num_bits(dh->p)-1;
-			}
 		priv_key=BN_new();
 		if (priv_key == NULL) goto err;
-		if (!BN_rand(priv_key,i,0,0)) goto err;
+		generate_new_key=1;
 		}
 	else
 		priv_key=dh->priv_key;
@@ -133,12 +131,17 @@ static int generate_key(DH *dh)
 		{
 		if ((dh->method_mont_p=(char *)BN_MONT_CTX_new()) != NULL)
 			if (!BN_MONT_CTX_set((BN_MONT_CTX *)dh->method_mont_p,
-				dh->p,&ctx)) goto err;
+				dh->p,ctx)) goto err;
 		}
 	mont=(BN_MONT_CTX *)dh->method_mont_p;
 
-	if (!dh->meth->bn_mod_exp(dh, pub_key,dh->g,priv_key,dh->p,&ctx,mont))
-								goto err;
+	if (generate_new_key)
+		{
+		l = dh->length ? dh->length : BN_num_bits(dh->p)-1; /* secret exponent length */
+		if (!BN_rand(priv_key, l, 0, 0)) goto err;
+		}
+	if (!ENGINE_get_DH(dh->engine)->bn_mod_exp(dh, pub_key, dh->g,
+		priv_key,dh->p,ctx,mont)) goto err;
 		
 	dh->pub_key=pub_key;
 	dh->priv_key=priv_key;
@@ -149,19 +152,21 @@ err:
 
 	if ((pub_key != NULL)  && (dh->pub_key == NULL))  BN_free(pub_key);
 	if ((priv_key != NULL) && (dh->priv_key == NULL)) BN_free(priv_key);
-	BN_CTX_free(&ctx);
+	BN_CTX_free(ctx);
 	return(ok);
 	}
 
-static int compute_key(unsigned char *key, BIGNUM *pub_key, DH *dh)
+static int compute_key(unsigned char *key, const BIGNUM *pub_key, DH *dh)
 	{
-	BN_CTX ctx;
+	BN_CTX *ctx;
 	BN_MONT_CTX *mont;
 	BIGNUM *tmp;
 	int ret= -1;
 
-	BN_CTX_init(&ctx);
-	tmp= &(ctx.bn[ctx.tos++]);
+	ctx = BN_CTX_new();
+	if (ctx == NULL) goto err;
+	BN_CTX_start(ctx);
+	tmp = BN_CTX_get(ctx);
 	
 	if (dh->priv_key == NULL)
 		{
@@ -172,11 +177,12 @@ static int compute_key(unsigned char *key, BIGNUM *pub_key, DH *dh)
 		{
 		if ((dh->method_mont_p=(char *)BN_MONT_CTX_new()) != NULL)
 			if (!BN_MONT_CTX_set((BN_MONT_CTX *)dh->method_mont_p,
-				dh->p,&ctx)) goto err;
+				dh->p,ctx)) goto err;
 		}
 
 	mont=(BN_MONT_CTX *)dh->method_mont_p;
-	if (!dh->meth->bn_mod_exp(dh, tmp,pub_key,dh->priv_key,dh->p,&ctx,mont))
+	if (!ENGINE_get_DH(dh->engine)->bn_mod_exp(dh, tmp, pub_key,
+				dh->priv_key,dh->p,ctx,mont))
 		{
 		DHerr(DH_F_DH_COMPUTE_KEY,ERR_R_BN_LIB);
 		goto err;
@@ -184,26 +190,35 @@ static int compute_key(unsigned char *key, BIGNUM *pub_key, DH *dh)
 
 	ret=BN_bn2bin(tmp,key);
 err:
-	BN_CTX_free(&ctx);
+	BN_CTX_end(ctx);
+	BN_CTX_free(ctx);
 	return(ret);
 	}
 
-static int dh_bn_mod_exp(DH *dh, BIGNUM *r, BIGNUM *a, const BIGNUM *p,
+static int dh_bn_mod_exp(const DH *dh, BIGNUM *r,
+			const 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);
-}
+	{
+	if (a->top == 1)
+		{
+		BN_ULONG A = a->d[0];
+		return BN_mod_exp_mont_word(r,A,p,m,ctx,m_ctx);
+		}
+	else
+		return BN_mod_exp_mont(r,a,p,m,ctx,m_ctx);
+	}
+
 
 static int dh_init(DH *dh)
-{
+	{
 	dh->flags |= DH_FLAG_CACHE_MONT_P;
 	return(1);
-}
+	}
 
 static int dh_finish(DH *dh)
-{
+	{
 	if(dh->method_mont_p)
 		BN_MONT_CTX_free((BN_MONT_CTX *)dh->method_mont_p);
 	return(1);
-}
+	}