1 files changed, 106 insertions, 25 deletions

diff --git a/src/lib/libcrypto/dh/dh_key.c b/src/lib/libcrypto/dh/dh_key.c
index 7576772bcd..1a0efca2c4 100644
--- a/src/lib/libcrypto/dh/dh_key.c
+++ b/src/lib/libcrypto/dh/dh_key.c
@@ -58,32 +58,63 @@
 
 #include <stdio.h>
 #include "cryptlib.h"
-#include "bn.h"
-#include "rand.h"
-#include "dh.h"
+#include <openssl/bn.h>
+#include <openssl/rand.h>
+#include <openssl/dh.h>
+#include <openssl/engine.h>
 
-int DH_generate_key(dh)
-DH *dh;
+static int generate_key(DH *dh);
+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);
+static int dh_finish(DH *dh);
+
+int DH_generate_key(DH *dh)
+        {
+        return dh->meth->generate_key(dh);
+        }
+
+int DH_compute_key(unsigned char *key, const BIGNUM *pub_key, DH *dh)
+        {
+        return dh->meth->compute_key(key, pub_key, dh);
+        }
+
+static DH_METHOD dh_ossl = {
+"OpenSSL DH Method",
+generate_key,
+compute_key,
+dh_bn_mod_exp,
+dh_init,
+dh_finish,
+0,
+NULL
+};
+
+const DH_METHOD *DH_OpenSSL(void)
+{
+        return &dh_ossl;
+}
+
+static int generate_key(DH *dh)
         {
         int ok=0;
-        unsigned int i;
-        BN_CTX *ctx=NULL;
+        int generate_new_key=0;
+        unsigned l;
+        BN_CTX *ctx;
+        BN_MONT_CTX *mont;
         BIGNUM *pub_key=NULL,*priv_key=NULL;
 
-        ctx=BN_CTX_new();
+        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;
@@ -96,7 +127,21 @@ DH *dh;
         else
                 pub_key=dh->pub_key;
 
-        if (!BN_mod_exp(pub_key,dh->g,priv_key,dh->p,ctx)) goto err;
+        if ((dh->method_mont_p == NULL) && (dh->flags & DH_FLAG_CACHE_MONT_P))
+                {
+                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;
+                }
+        mont=(BN_MONT_CTX *)dh->method_mont_p;
+
+        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 (!dh->meth->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;
@@ -107,29 +152,36 @@ 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);
-        if (ctx != NULL) BN_CTX_free(ctx);
+        BN_CTX_free(ctx);
         return(ok);
         }
 
-int DH_compute_key(key,pub_key,dh)
-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_MONT_CTX *mont;
         BIGNUM *tmp;
         int ret= -1;
 
-        ctx=BN_CTX_new();
+        ctx = BN_CTX_new();
         if (ctx == NULL) goto err;
-        tmp=ctx->bn[ctx->tos++];
+        BN_CTX_start(ctx);
+        tmp = BN_CTX_get(ctx);
         
         if (dh->priv_key == NULL)
                 {
                 DHerr(DH_F_DH_COMPUTE_KEY,DH_R_NO_PRIVATE_VALUE);
                 goto err;
                 }
-        if (!BN_mod_exp(tmp,pub_key,dh->priv_key,dh->p,ctx))
+        if ((dh->method_mont_p == NULL) && (dh->flags & DH_FLAG_CACHE_MONT_P))
+                {
+                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;
+                }
+
+        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))
                 {
                 DHerr(DH_F_DH_COMPUTE_KEY,ERR_R_BN_LIB);
                 goto err;
@@ -137,6 +189,35 @@ DH *dh;
 
         ret=BN_bn2bin(tmp,key);
 err:
-        if (ctx != NULL) BN_CTX_free(ctx);
+        BN_CTX_end(ctx);
+        BN_CTX_free(ctx);
         return(ret);
         }
+
+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)
+        {
+        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);
+        }