X-Git-Url: http://www.project-moonshot.org/gitweb/?a=blobdiff_plain;f=libeap%2Fsrc%2Fcrypto%2Ffips_prf_internal.c;fp=libeap%2Fsrc%2Fcrypto%2Ffips_prf_internal.c;h=a85cb14d7424ac60a0ee122d86ec32bc36734280;hb=fa210a112d16848a282d662f16f9b8589dd371df;hp=0000000000000000000000000000000000000000;hpb=a3d666260a9b578b9ad6f7ffd15671530ec632d9;p=mech_eap.orig

diff --git a/libeap/src/crypto/fips_prf_internal.c b/libeap/src/crypto/fips_prf_internal.c
new file mode 100644
index 0000000..a85cb14
--- /dev/null
+++ b/libeap/src/crypto/fips_prf_internal.c
@@ -0,0 +1,74 @@
+/*
+ * FIPS 186-2 PRF for internal crypto implementation
+ * Copyright (c) 2006-2007, 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 "sha1_i.h"
+#include "crypto.h"
+
+
+int fips186_2_prf(const u8 *seed, size_t seed_len, u8 *x, size_t xlen)
+{
+	u8 xkey[64];
+	u32 t[5], _t[5];
+	int i, j, m, k;
+	u8 *xpos = x;
+	u32 carry;
+
+	if (seed_len > sizeof(xkey))
+		seed_len = sizeof(xkey);
+
+	/* FIPS 186-2 + change notice 1 */
+
+	os_memcpy(xkey, seed, seed_len);
+	os_memset(xkey + seed_len, 0, 64 - seed_len);
+	t[0] = 0x67452301;
+	t[1] = 0xEFCDAB89;
+	t[2] = 0x98BADCFE;
+	t[3] = 0x10325476;
+	t[4] = 0xC3D2E1F0;
+
+	m = xlen / 40;
+	for (j = 0; j < m; j++) {
+		/* XSEED_j = 0 */
+		for (i = 0; i < 2; i++) {
+			/* XVAL = (XKEY + XSEED_j) mod 2^b */
+
+			/* w_i = G(t, XVAL) */
+			os_memcpy(_t, t, 20);
+			SHA1Transform(_t, xkey);
+			_t[0] = host_to_be32(_t[0]);
+			_t[1] = host_to_be32(_t[1]);
+			_t[2] = host_to_be32(_t[2]);
+			_t[3] = host_to_be32(_t[3]);
+			_t[4] = host_to_be32(_t[4]);
+			os_memcpy(xpos, _t, 20);
+
+			/* XKEY = (1 + XKEY + w_i) mod 2^b */
+			carry = 1;
+			for (k = 19; k >= 0; k--) {
+				carry += xkey[k] + xpos[k];
+				xkey[k] = carry & 0xff;
+				carry >>= 8;
+			}
+
+			xpos += SHA1_MAC_LEN;
+		}
+		/* x_j = w_0|w_1 */
+	}
+
+	return 0;
+}