From aa4d426b4d3527d7e166df1a05058c9a4a0f6683 Mon Sep 17 00:00:00 2001
From: Wojtek Kosior <wk@koszkonutek-tmp.pl.eu.org>
Date: Fri, 30 Apr 2021 00:33:56 +0200
Subject: initial/final commit

---
 openssl-1.1.0h/crypto/dsa/dsa_key.c | 77 +++++++++++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100644 openssl-1.1.0h/crypto/dsa/dsa_key.c

(limited to 'openssl-1.1.0h/crypto/dsa/dsa_key.c')

diff --git a/openssl-1.1.0h/crypto/dsa/dsa_key.c b/openssl-1.1.0h/crypto/dsa/dsa_key.c
new file mode 100644
index 0000000..31442b1
--- /dev/null
+++ b/openssl-1.1.0h/crypto/dsa/dsa_key.c
@@ -0,0 +1,77 @@
+/*
+ * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the OpenSSL license (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
+ */
+
+#include <stdio.h>
+#include <time.h>
+#include "internal/cryptlib.h"
+#include <openssl/bn.h>
+#include "dsa_locl.h"
+
+static int dsa_builtin_keygen(DSA *dsa);
+
+int DSA_generate_key(DSA *dsa)
+{
+    if (dsa->meth->dsa_keygen)
+        return dsa->meth->dsa_keygen(dsa);
+    return dsa_builtin_keygen(dsa);
+}
+
+static int dsa_builtin_keygen(DSA *dsa)
+{
+    int ok = 0;
+    BN_CTX *ctx = NULL;
+    BIGNUM *pub_key = NULL, *priv_key = NULL;
+
+    if ((ctx = BN_CTX_new()) == NULL)
+        goto err;
+
+    if (dsa->priv_key == NULL) {
+        if ((priv_key = BN_secure_new()) == NULL)
+            goto err;
+    } else
+        priv_key = dsa->priv_key;
+
+    do
+        if (!BN_rand_range(priv_key, dsa->q))
+            goto err;
+    while (BN_is_zero(priv_key)) ;
+
+    if (dsa->pub_key == NULL) {
+        if ((pub_key = BN_new()) == NULL)
+            goto err;
+    } else
+        pub_key = dsa->pub_key;
+
+    {
+        BIGNUM *prk = BN_new();
+
+        if (prk == NULL)
+            goto err;
+        BN_with_flags(prk, priv_key, BN_FLG_CONSTTIME);
+
+        if (!BN_mod_exp(pub_key, dsa->g, prk, dsa->p, ctx)) {
+            BN_free(prk);
+            goto err;
+        }
+        /* We MUST free prk before any further use of priv_key */
+        BN_free(prk);
+    }
+
+    dsa->priv_key = priv_key;
+    dsa->pub_key = pub_key;
+    ok = 1;
+
+ err:
+    if (pub_key != dsa->pub_key)
+        BN_free(pub_key);
+    if (priv_key != dsa->priv_key)
+        BN_free(priv_key);
+    BN_CTX_free(ctx);
+    return (ok);
+}
-- 
cgit v1.2.3