remove @EAP_LDFLAGS@, no longer exists

[mech_eap.orig] / libeap / src / crypto / sha1-tprf.c

diff --git a/libeap/src/crypto/sha1-tprf.c b/libeap/src/crypto/sha1-tprf.c
new file mode 100644 (file)
index 0000000..4a80e96
--- /dev/null
+++ b/libeap/src/crypto/sha1-tprf.c
@@ -0,0 +1,76 @@
+/*
+ * SHA1 T-PRF for EAP-FAST
+ * 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 "sha1.h"
+#include "crypto.h"
+
+/**
+ * sha1_t_prf - EAP-FAST Pseudo-Random Function (T-PRF)
+ * @key: Key for PRF
+ * @key_len: Length of the key in bytes
+ * @label: A unique label for each purpose of the PRF
+ * @seed: Seed value to bind into the key
+ * @seed_len: Length of the seed
+ * @buf: Buffer for the generated pseudo-random key
+ * @buf_len: Number of bytes of key to generate
+ * Returns: 0 on success, -1 of failure
+ *
+ * This function is used to derive new, cryptographically separate keys from a
+ * given key for EAP-FAST. T-PRF is defined in RFC 4851, Section 5.5.
+ */
+int sha1_t_prf(const u8 *key, size_t key_len, const char *label,
+              const u8 *seed, size_t seed_len, u8 *buf, size_t buf_len)
+{
+       unsigned char counter = 0;
+       size_t pos, plen;
+       u8 hash[SHA1_MAC_LEN];
+       size_t label_len = os_strlen(label);
+       u8 output_len[2];
+       const unsigned char *addr[5];
+       size_t len[5];
+
+       addr[0] = hash;
+       len[0] = 0;
+       addr[1] = (unsigned char *) label;
+       len[1] = label_len + 1;
+       addr[2] = seed;
+       len[2] = seed_len;
+       addr[3] = output_len;
+       len[3] = 2;
+       addr[4] = &counter;
+       len[4] = 1;
+
+       output_len[0] = (buf_len >> 8) & 0xff;
+       output_len[1] = buf_len & 0xff;
+       pos = 0;
+       while (pos < buf_len) {
+               counter++;
+               plen = buf_len - pos;
+               if (hmac_sha1_vector(key, key_len, 5, addr, len, hash))
+                       return -1;
+               if (plen >= SHA1_MAC_LEN) {
+                       os_memcpy(&buf[pos], hash, SHA1_MAC_LEN);
+                       pos += SHA1_MAC_LEN;
+               } else {
+                       os_memcpy(&buf[pos], hash, plen);
+                       break;
+               }
+               len[0] = SHA1_MAC_LEN;
+       }
+
+       return 0;
+}