Make DH opaque

Move the dh_st structure into an internal header file and provide
relevant accessors for the internal fields.

Reviewed-by: Richard Levitte <levitte@openssl.org>

1 files changed, 38 insertions, 0 deletions

diff --git a/crypto/dh/dh_locl.h b/crypto/dh/dh_locl.h
new file mode 100644
index 0000000000..5d51e591fe
--- /dev/null
+++ b/crypto/dh/dh_locl.h
@@ -0,0 +1,38 @@
+/*
+ * Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the OpenSSL licenses, (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * https://www.openssl.org/source/license.html
+ * or in the file LICENSE in the source distribution.
+ */
+
+#include <openssl/dh.h>
+
+struct dh_st {
+    /*
+     * This first argument is used to pick up errors when a DH is passed
+     * instead of a EVP_PKEY
+     */
+    int pad;
+    int version;
+    BIGNUM *p;
+    BIGNUM *g;
+    long length;                /* optional */
+    BIGNUM *pub_key;            /* g^x % p */
+    BIGNUM *priv_key;           /* x */
+    int flags;
+    BN_MONT_CTX *method_mont_p;
+    /* Place holders if we want to do X9.42 DH */
+    BIGNUM *q;
+    BIGNUM *j;
+    unsigned char *seed;
+    int seedlen;
+    BIGNUM *counter;
+    int references;
+    CRYPTO_EX_DATA ex_data;
+    const DH_METHOD *meth;
+    ENGINE *engine;
+    CRYPTO_RWLOCK *lock;
+};