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authorYen Lin <yelin@nvidia.com>2012-04-05 11:54:58 +0000
committerAlbert ARIBAUD <albert.u.boot@aribaud.net>2012-05-15 08:31:37 +0200
commit5b1a5451d5aa3f440da071d303bc8064ae5571b9 (patch)
tree7e799417424f5a3f8c480bb3c704b403e6b6bf8a /include/aes.h
parent1aa7e23e2ba41c94d61bcd9199afb23817400f3c (diff)
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Add AES crypto library
Add support for AES using an implementation from Karl Malbrain. This offers small code size (around 5KB on ARM) and supports 128-bit AES only. Signed-off-by: Yen Lin <yelin@nvidia.com> Signed-off-by: Simon Glass <sjg@chromium.org> Signed-off-by: Tom Warren <twarren@nvidia.com>
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+/*
+ * Copyright (c) 2011 The Chromium OS Authors.
+ * (C) Copyright 2010 - 2011 NVIDIA Corporation <www.nvidia.com>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#ifndef _AES_REF_H_
+#define _AES_REF_H_
+
+/*
+ * AES encryption library, with small code size, supporting only 128-bit AES
+ *
+ * AES is a stream cipher which works a block at a time, with each block
+ * in this case being AES_KEY_LENGTH bytes.
+ */
+
+enum {
+ AES_STATECOLS = 4, /* columns in the state & expanded key */
+ AES_KEYCOLS = 4, /* columns in a key */
+ AES_ROUNDS = 10, /* rounds in encryption */
+
+ AES_KEY_LENGTH = 128 / 8,
+ AES_EXPAND_KEY_LENGTH = 4 * AES_STATECOLS * (AES_ROUNDS + 1),
+};
+
+/**
+ * Expand a key into a key schedule, which is then used for the other
+ * operations.
+ *
+ * \param key Key, of length AES_KEY_LENGTH bytes
+ * \param expkey Buffer to place expanded key, AES_EXPAND_KEY_LENGTH
+ */
+void aes_expand_key(u8 *key, u8 *expkey);
+
+/**
+ * Encrypt a single block of data
+ *
+ * in Input data
+ * expkey Expanded key to use for encryption (from aes_expand_key())
+ * out Output data
+ */
+void aes_encrypt(u8 *in, u8 *expkey, u8 *out);
+
+/**
+ * Decrypt a single block of data
+ *
+ * in Input data
+ * expkey Expanded key to use for decryption (from aes_expand_key())
+ * out Output data
+ */
+void aes_decrypt(u8 *in, u8 *expkey, u8 *out);
+
+#endif /* _AES_REF_H_ */