shared: Add helpers for SHA-1 based HMAC, PBKDF2 and PRF

2 files changed, 222 insertions, 0 deletions

diff --git a/src/shared/sha1.c b/src/shared/sha1.c
new file mode 100644
index 00000000..e67b020d
--- /dev/null
+++ b/src/shared/sha1.c
@@ -0,0 +1,189 @@
+/*
+ *
+ *  Connection Manager
+ *
+ *  Copyright (C) 2012  Intel Corporation. All rights reserved.
+ *
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2.1 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <string.h>
+
+#include <glib.h>
+
+#include "src/shared/sha1.h"
+
+#define SHA1_MAC_LEN 20
+
+static void __hmac_sha1(GChecksum *checksum, const void *key, size_t key_len,
+			const void *data, size_t data_len, void *output)
+{
+	unsigned char ipad[64];
+	unsigned char opad[64];
+	unsigned char digest[SHA1_MAC_LEN];
+	size_t length;
+	int i;
+
+	/* if key is longer than 64 bytes reset it to key=SHA1(key) */
+	if (key_len > 64) {
+		g_checksum_update(checksum, key, key_len);
+		length = sizeof(digest);
+		g_checksum_get_digest(checksum, digest, &length);
+
+		g_checksum_reset(checksum);
+
+		key = digest;
+		key_len = SHA1_MAC_LEN;
+	}
+
+	/* start out by storing key in pads */
+	memset(ipad, 0, sizeof(ipad));
+	memset(opad, 0, sizeof(opad));
+	memcpy(ipad, key, key_len);
+	memcpy(opad, key, key_len);
+
+	/* XOR key with ipad and opad values */
+	for (i = 0; i < 64; i++) {
+		ipad[i] ^= 0x36;
+		opad[i] ^= 0x5c;
+	}
+
+	/* perform inner SHA1 */
+	g_checksum_update(checksum, ipad, sizeof(ipad));
+	g_checksum_update(checksum, data, data_len);
+	length = sizeof(digest);
+	g_checksum_get_digest(checksum, digest, &length);
+
+	g_checksum_reset(checksum);
+
+	/* perform outer SHA1 */
+	g_checksum_update(checksum, opad, sizeof(opad));
+	g_checksum_update(checksum, digest, length);
+	length = sizeof(digest);
+	g_checksum_get_digest(checksum, output, &length);
+
+	g_checksum_reset(checksum);
+}
+
+int hmac_sha1(const void *key, size_t key_len,
+                const void *data, size_t data_len, void *output, size_t size)
+{
+	GChecksum *checksum;
+
+	checksum = g_checksum_new(G_CHECKSUM_SHA1);
+
+	__hmac_sha1(checksum, key, key_len, data, data_len, output);
+
+	g_checksum_free(checksum);
+
+	return 0;
+}
+
+static void F(GChecksum *checksum, const char *password, size_t password_len,
+				const char *salt, size_t salt_len,
+				unsigned int iterations, unsigned int count,
+							unsigned char *digest)
+{
+	unsigned char tmp1[SHA1_MAC_LEN];
+	unsigned char tmp2[SHA1_MAC_LEN];
+	unsigned char buf[36];
+	unsigned int i, j;
+
+	memcpy(buf, salt, salt_len);
+	buf[salt_len + 0] = (count >> 24) & 0xff;
+	buf[salt_len + 1] = (count >> 16) & 0xff;
+	buf[salt_len + 2] = (count >> 8) & 0xff;
+	buf[salt_len + 3] = count & 0xff;
+
+	__hmac_sha1(checksum, password, password_len,
+					buf, salt_len + 4, tmp1);
+	memcpy(digest, tmp1, SHA1_MAC_LEN);
+
+	for (i = 1; i < iterations; i++) {
+		__hmac_sha1(checksum, password, password_len,
+						tmp1, SHA1_MAC_LEN, tmp2);
+		memcpy(tmp1, tmp2, SHA1_MAC_LEN);
+
+		for (j = 0; j < SHA1_MAC_LEN; j++)
+			digest[j] ^= tmp2[j];
+	}
+}
+
+int pbkdf2_sha1(const void *password, size_t password_len,
+			const void *salt, size_t salt_len,
+			unsigned int iterations, void *output, size_t size)
+{
+	GChecksum *checksum;
+	unsigned char *ptr = output;
+	unsigned char digest[SHA1_MAC_LEN];
+	unsigned int i;
+
+	checksum = g_checksum_new(G_CHECKSUM_SHA1);
+
+	for (i = 1; size > 0; i++) {
+		size_t len;
+
+		F(checksum, password, password_len, salt, salt_len,
+						iterations, i, digest);
+
+		len = size > SHA1_MAC_LEN ? SHA1_MAC_LEN : size;
+		memcpy(ptr, digest, len);
+
+		ptr += len;
+		size -= len;
+	}
+
+	g_checksum_free(checksum);
+
+	return 0;
+}
+
+int prf_sha1(const void *key, size_t key_len,
+		const void *prefix, size_t prefix_len,
+		const void *data, size_t data_len, void *output, size_t size)
+{
+	GChecksum *checksum;
+	unsigned char input[1024];
+	size_t input_len;
+	unsigned int i, offset = 0;
+
+	checksum = g_checksum_new(G_CHECKSUM_SHA1);
+
+	memcpy(input, prefix, prefix_len);
+	input[prefix_len] = 0;
+
+	memcpy(input + prefix_len + 1, data, data_len);
+	input[prefix_len + 1 + data_len] = 0;
+
+	input_len = prefix_len + 1 + data_len + 1;
+
+	for (i = 0; i < (size + 19) / 20; i++) {
+		__hmac_sha1(checksum, key, key_len, input, input_len,
+							output + offset);
+
+		offset += 20;
+		input[input_len - 1]++;
+	}
+
+	g_checksum_free(checksum);
+
+	return 0;
+}
diff --git a/src/shared/sha1.h b/src/shared/sha1.h
new file mode 100644
index 00000000..0c0c6d19
--- /dev/null
+++ b/src/shared/sha1.h
@@ -0,0 +1,33 @@
+/*
+ *
+ *  Connection Manager
+ *
+ *  Copyright (C) 2012  Intel Corporation. All rights reserved.
+ *
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2.1 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+int hmac_sha1(const void *key, size_t key_len,
+		const void *data, size_t data_len, void *output, size_t size);
+
+int pbkdf2_sha1(const void *password, size_t password_len,
+			const void *salt, size_t salt_len,
+			unsigned int iterations, void *output, size_t size);
+
+int prf_sha1(const void *key, size_t key_len,
+		const void *prefix, size_t prefix_len,
+		const void *data, size_t data_len, void *output, size_t size);