Following the license change, modify the boilerplates in crypto/dh/

[openssl.git] / crypto / dh / dh_key.c

diff --git a/crypto/dh/dh_key.c b/crypto/dh/dh_key.c
index 9b79f394fcfb719f9405fbac4abeccf00dd94a4f..58210fbbfdc52084071aa6727f17467ebd9c6c72 100644 (file)
--- a/crypto/dh/dh_key.c
+++ b/crypto/dh/dh_key.c
@@ -1,7 +1,7 @@
 /*
- * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
+ * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
  *
- * Licensed under the OpenSSL license (the "License").  You may not use
+ * Licensed under the Apache License 2.0 (the "License").  You may not use
  * this file except in compliance with the License.  You can obtain a copy
  * in the file LICENSE in the source distribution or at
  * https://www.openssl.org/source/license.html
@@ -9,7 +9,6 @@
 
 #include <stdio.h>
 #include "internal/cryptlib.h"
-#include <openssl/rand.h>
 #include "dh_locl.h"
 #include "internal/bn_int.h"
 
@@ -57,20 +56,37 @@ static DH_METHOD dh_ossl = {
     NULL
 };
 
+static const DH_METHOD *default_DH_method = &dh_ossl;
+
 const DH_METHOD *DH_OpenSSL(void)
 {
     return &dh_ossl;
 }
 
+void DH_set_default_method(const DH_METHOD *meth)
+{
+    default_DH_method = meth;
+}
+
+const DH_METHOD *DH_get_default_method(void)
+{
+    return default_DH_method;
+}
+
 static int generate_key(DH *dh)
 {
     int ok = 0;
     int generate_new_key = 0;
     unsigned l;
-    BN_CTX *ctx;
+    BN_CTX *ctx = NULL;
     BN_MONT_CTX *mont = NULL;
     BIGNUM *pub_key = NULL, *priv_key = NULL;
 
+    if (BN_num_bits(dh->p) > OPENSSL_DH_MAX_MODULUS_BITS) {
+        DHerr(DH_F_GENERATE_KEY, DH_R_MODULUS_TOO_LARGE);
+        return 0;
+    }
+
     ctx = BN_CTX_new();
     if (ctx == NULL)
         goto err;
@@ -100,37 +116,31 @@ static int generate_key(DH *dh)
     if (generate_new_key) {
         if (dh->q) {
             do {
-                if (!BN_rand_range(priv_key, dh->q))
+                if (!BN_priv_rand_range(priv_key, dh->q))
                     goto err;
             }
             while (BN_is_zero(priv_key) || BN_is_one(priv_key));
         } else {
             /* secret exponent length */
             l = dh->length ? dh->length : BN_num_bits(dh->p) - 1;
-            if (!BN_rand(priv_key, l, 0, 0))
+            if (!BN_priv_rand(priv_key, l, BN_RAND_TOP_ONE, BN_RAND_BOTTOM_ANY))
                 goto err;
         }
     }
 
     {
-        BIGNUM *local_prk = NULL;
-        BIGNUM *prk;
+        BIGNUM *prk = BN_new();
 
-        if ((dh->flags & DH_FLAG_NO_EXP_CONSTTIME) == 0) {
-            local_prk = prk = BN_new();
-            if (local_prk == NULL)
-                goto err;
-            BN_with_flags(prk, priv_key, BN_FLG_CONSTTIME);
-        } else {
-            prk = priv_key;
-        }
+        if (prk == NULL)
+            goto err;
+        BN_with_flags(prk, priv_key, BN_FLG_CONSTTIME);
 
         if (!dh->meth->bn_mod_exp(dh, pub_key, dh->g, prk, dh->p, ctx, mont)) {
-            BN_free(local_prk);
+            BN_free(prk);
             goto err;
         }
-        /* We MUST free local_prk before any further use of priv_key */
-        BN_free(local_prk);
+        /* We MUST free prk before any further use of priv_key */
+        BN_free(prk);
     }
 
     dh->pub_key = pub_key;
@@ -145,7 +155,7 @@ static int generate_key(DH *dh)
     if (priv_key != dh->priv_key)
         BN_free(priv_key);
     BN_CTX_free(ctx);
-    return (ok);
+    return ok;
 }
 
 static int compute_key(unsigned char *key, const BIGNUM *pub_key, DH *dh)
@@ -166,6 +176,8 @@ static int compute_key(unsigned char *key, const BIGNUM *pub_key, DH *dh)
         goto err;
     BN_CTX_start(ctx);
     tmp = BN_CTX_get(ctx);
+    if (tmp == NULL)
+        goto err;
 
     if (dh->priv_key == NULL) {
         DHerr(DH_F_COMPUTE_KEY, DH_R_NO_PRIVATE_VALUE);
@@ -175,10 +187,7 @@ static int compute_key(unsigned char *key, const BIGNUM *pub_key, DH *dh)
     if (dh->flags & DH_FLAG_CACHE_MONT_P) {
         mont = BN_MONT_CTX_set_locked(&dh->method_mont_p,
                                       dh->lock, dh->p, ctx);
-        if ((dh->flags & DH_FLAG_NO_EXP_CONSTTIME) == 0) {
-            /* XXX */
-            BN_set_flags(dh->priv_key, BN_FLG_CONSTTIME);
-        }
+        BN_set_flags(dh->priv_key, BN_FLG_CONSTTIME);
         if (!mont)
             goto err;
     }
@@ -200,32 +209,24 @@ static int compute_key(unsigned char *key, const BIGNUM *pub_key, DH *dh)
         BN_CTX_end(ctx);
         BN_CTX_free(ctx);
     }
-    return (ret);
+    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 is only one word long and constant time is false, use the faster
-     * exponentiation function.
-     */
-    if (bn_get_top(a) == 1 && ((dh->flags & DH_FLAG_NO_EXP_CONSTTIME) != 0)) {
-        BN_ULONG A = bn_get_words(a)[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);
+    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);
+    return 1;
 }
 
 static int dh_finish(DH *dh)
 {
     BN_MONT_CTX_free(dh->method_mont_p);
-    return (1);
+    return 1;
 }