New functions BN_CTX_start(), BN_CTX_get(), BN_CTX_end() to access
[openssl.git] / crypto / dh / dh_key.c
index fa2c960..0c7eeaf 100644 (file)
 
 #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>
 
-int DH_generate_key(dh)
-DH *dh;
+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,
+                       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, 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
+};
+
+DH_METHOD *DH_OpenSSL(void)
+{
+       return &dh_ossl;
+}
+
+static int generate_key(DH *dh)
        {
        int ok=0;
        unsigned int i;
@@ -104,7 +137,8 @@ DH *dh;
                }
        mont=(BN_MONT_CTX *)dh->method_mont_p;
 
-       if (!BN_mod_exp_mont(pub_key,dh->g,priv_key,dh->p,&ctx,mont)) 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;
@@ -119,10 +153,7 @@ err:
        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, BIGNUM *pub_key, DH *dh)
        {
        BN_CTX ctx;
        BN_MONT_CTX *mont;
@@ -130,7 +161,8 @@ DH *dh;
        int ret= -1;
 
        BN_CTX_init(&ctx);
-       tmp= &(ctx.bn[ctx.tos++]);
+       BN_CTX_start(&ctx);
+       tmp = BN_CTX_get(&ctx);
        
        if (dh->priv_key == NULL)
                {
@@ -145,7 +177,7 @@ DH *dh;
                }
 
        mont=(BN_MONT_CTX *)dh->method_mont_p;
-       if (!BN_mod_exp_mont(tmp,pub_key,dh->priv_key,dh->p,&ctx,mont))
+       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;
@@ -153,6 +185,27 @@ DH *dh;
 
        ret=BN_bn2bin(tmp,key);
 err:
+       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,
+                       const BIGNUM *m, BN_CTX *ctx,
+                       BN_MONT_CTX *m_ctx)
+{
+       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);
+}