remove @EAP_LDFLAGS@, no longer exists

[mech_eap.git] / libeap / src / crypto / md5.c

diff --git a/libeap/src/crypto/md5.c b/libeap/src/crypto/md5.c
new file mode 100644 (file)
index 0000000..7f14e9b
--- /dev/null
+++ b/libeap/src/crypto/md5.c
@@ -0,0 +1,111 @@
+/*
+ * MD5 hash implementation and interface functions
+ * Copyright (c) 2003-2005, Jouni Malinen <j@w1.fi>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Alternatively, this software may be distributed under the terms of BSD
+ * license.
+ *
+ * See README and COPYING for more details.
+ */
+
+#include "includes.h"
+
+#include "common.h"
+#include "md5.h"
+#include "crypto.h"
+
+
+/**
+ * hmac_md5_vector - HMAC-MD5 over data vector (RFC 2104)
+ * @key: Key for HMAC operations
+ * @key_len: Length of the key in bytes
+ * @num_elem: Number of elements in the data vector
+ * @addr: Pointers to the data areas
+ * @len: Lengths of the data blocks
+ * @mac: Buffer for the hash (16 bytes)
+ * Returns: 0 on success, -1 on failure
+ */
+int hmac_md5_vector(const u8 *key, size_t key_len, size_t num_elem,
+                   const u8 *addr[], const size_t *len, u8 *mac)
+{
+       u8 k_pad[64]; /* padding - key XORd with ipad/opad */
+       u8 tk[16];
+       const u8 *_addr[6];
+       size_t i, _len[6];
+
+       if (num_elem > 5) {
+               /*
+                * Fixed limit on the number of fragments to avoid having to
+                * allocate memory (which could fail).
+                */
+               return -1;
+       }
+
+        /* if key is longer than 64 bytes reset it to key = MD5(key) */
+        if (key_len > 64) {
+               if (md5_vector(1, &key, &key_len, tk))
+                       return -1;
+               key = tk;
+               key_len = 16;
+        }
+
+       /* the HMAC_MD5 transform looks like:
+        *
+        * MD5(K XOR opad, MD5(K XOR ipad, text))
+        *
+        * where K is an n byte key
+        * ipad is the byte 0x36 repeated 64 times
+        * opad is the byte 0x5c repeated 64 times
+        * and text is the data being protected */
+
+       /* start out by storing key in ipad */
+       os_memset(k_pad, 0, sizeof(k_pad));
+       os_memcpy(k_pad, key, key_len);
+
+       /* XOR key with ipad values */
+       for (i = 0; i < 64; i++)
+               k_pad[i] ^= 0x36;
+
+       /* perform inner MD5 */
+       _addr[0] = k_pad;
+       _len[0] = 64;
+       for (i = 0; i < num_elem; i++) {
+               _addr[i + 1] = addr[i];
+               _len[i + 1] = len[i];
+       }
+       if (md5_vector(1 + num_elem, _addr, _len, mac))
+               return -1;
+
+       os_memset(k_pad, 0, sizeof(k_pad));
+       os_memcpy(k_pad, key, key_len);
+       /* XOR key with opad values */
+       for (i = 0; i < 64; i++)
+               k_pad[i] ^= 0x5c;
+
+       /* perform outer MD5 */
+       _addr[0] = k_pad;
+       _len[0] = 64;
+       _addr[1] = mac;
+       _len[1] = MD5_MAC_LEN;
+       return md5_vector(2, _addr, _len, mac);
+}
+
+
+/**
+ * hmac_md5 - HMAC-MD5 over data buffer (RFC 2104)
+ * @key: Key for HMAC operations
+ * @key_len: Length of the key in bytes
+ * @data: Pointers to the data area
+ * @data_len: Length of the data area
+ * @mac: Buffer for the hash (16 bytes)
+ * Returns: 0 on success, -1 on failure
+ */
+int hmac_md5(const u8 *key, size_t key_len, const u8 *data, size_t data_len,
+             u8 *mac)
+{
+       return hmac_md5_vector(key, key_len, 1, &data, &data_len, mac);
+}