From aadb9e2e90925a187877241e50110e4ce7ea80a1 Mon Sep 17 00:00:00 2001
From: Benjamin Barenblat <bbaren@mit.edu>
Date: Sat, 14 Mar 2015 19:47:09 -0400
Subject: Imported Upstream version 1.3

---
 secure_random_cryptlib.c | 84 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 84 insertions(+)
 create mode 100644 secure_random_cryptlib.c

(limited to 'secure_random_cryptlib.c')

diff --git a/secure_random_cryptlib.c b/secure_random_cryptlib.c
new file mode 100644
index 0000000..ba0fbe8
--- /dev/null
+++ b/secure_random_cryptlib.c
@@ -0,0 +1,84 @@
+/*
+  secure_random_openssl.c - secure random number generator using OpenSSL
+  (c) 2004-2005 Zeljko Vrba <zvrba@globalnet.hr>
+
+  Permission is hereby granted, free of charge, to any person obtaining
+  a copy of this software and associated documentation files (the
+  "Software"), to deal in the Software without restriction, including
+  without limitation the rights to use, copy, modify, merge, publish,
+  distribute, sublicense, and/or sell copies of the Software, and to
+  permit persons to whom the Software is furnished to do so, subject to
+  the following conditions:
+
+  The above copyright notice and this permission notice shall be
+  included in all copies or substantial portions of the Software.
+
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+  CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+  TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+  SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+#include <cryptlib.h>
+#include "exceptions.h"
+
+static char rcsid[] = "$Id: secure_random_cryptlib.c 1 2005-11-13 20:23:40Z zvrba $";
+
+/**
+	@file
+	Cryptlib random number generator.
+*/
+
+struct SRNG_st {
+	CRYPT_CONTEXT ctx;
+	char rnd[64];
+};
+
+#define	CALL_CL(func, ...) do { \
+	int ret__ = func(__VA_ARGS__); \
+	if(ret__ != CRYPT_OK) { \
+		fprintf(stderr, "cryptlib error: %d\n", ret__); \
+		Throw(lib_crypto_exception); \
+	} \
+} while(0)
+
+unsigned int SRNG_init(struct SRNG_st *st)
+{
+	if(!st)
+		goto end;
+
+	CALL_CL(cryptInit);
+	CALL_CL(cryptAddRandom, NULL, CRYPT_RANDOM_SLOWPOLL);
+	CALL_CL(cryptCreateContext, &st->ctx, CRYPT_UNUSED, CRYPT_ALGO_RC4);
+	CALL_CL(cryptGenerateKey, st->ctx);
+
+end:
+	return sizeof(struct SRNG_st);
+}
+
+void SRNG_bytes(
+	struct SRNG_st *st,
+	void *buf,
+	unsigned int n)
+{
+	assert(n < sizeof(st->rnd));
+	CALL_CL(cryptEncrypt, st->ctx, st->rnd, sizeof(st->rnd));
+	memcpy(buf, st->rnd, n);
+}
+
+void SRNG_destroy(struct SRNG_st *st)
+{
+	printf("INFO: destroying random number generator.\n");
+	CALL_CL(cryptDestroyContext, st->ctx);
+	if(cryptEnd() != CRYPT_OK) {
+		fprintf(stderr, "ERROR: some garbage left to cryptlib.");
+	}
+	memset(st, 0, sizeof(*st));
+}
+
-- 
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