Constify DH-related code.
[openssl.git] / crypto / dh / dh_key.c
index 4e6a0fc..0e4fee1 100644 (file)
 #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;
 }
@@ -137,8 +139,9 @@ static int generate_key(DH *dh)
                }
        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 (!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;
@@ -153,7 +156,7 @@ err:
        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_MONT_CTX *mont;
@@ -161,7 +164,8 @@ static int compute_key(unsigned char *key, BIGNUM *pub_key, 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)
                {
@@ -176,7 +180,8 @@ static int compute_key(unsigned char *key, BIGNUM *pub_key, DH *dh)
                }
 
        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 +189,35 @@ static int compute_key(unsigned char *key, BIGNUM *pub_key, 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,
+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);
-}
+       }