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diff --git a/gs/base/aes.h b/gs/base/aes.h
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+/*
+ *  FIPS-197 compliant AES implementation
+ *
+ *  Copyright (C) 2006-2007  Christophe Devine
+ *
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions
+ *  are met:
+ *
+ *    * Redistributions of source code _must_ retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *    * Redistributions in binary form may or may not reproduce the above
+ *      copyright notice, this list of conditions and the following
+ *      disclaimer in the documentation and/or other materials provided
+ *      with the distribution.
+ *    * Neither the name of XySSL nor the names of its contributors may be
+ *      used to endorse or promote products derived from this software
+ *      without specific prior written permission.
+ *
+ *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ *  FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+ *  TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ *  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/* $Id$ */
+/* AES block cipher implementation from XYSSL */
+
+#ifndef XYSSL_AES_H
+#define XYSSL_AES_H
+
+#define AES_ENCRYPT     1
+#define AES_DECRYPT     0
+
+/**
+ * \brief          AES context structure
+ */
+typedef struct
+{
+    int nr;                     /*!<  number of rounds  */
+    unsigned long *rk;          /*!<  AES round keys    */
+    unsigned long buf[68];      /*!<  unaligned data    */
+}
+aes_context;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \brief          AES key schedule (encryption)
+ *
+ * \param ctx      AES context to be initialized
+ * \param key      encryption key
+ * \param keysize  must be 128, 192 or 256
+ */
+void aes_setkey_enc( aes_context *ctx, const unsigned char *key,
+			int keysize );
+
+/**
+ * \brief          AES key schedule (decryption)
+ *
+ * \param ctx      AES context to be initialized
+ * \param key      decryption key
+ * \param keysize  must be 128, 192 or 256
+ */
+void aes_setkey_dec( aes_context *ctx, const unsigned char *key,
+			int keysize );
+
+/**
+ * \brief          AES-ECB block encryption/decryption
+ *
+ * \param ctx      AES context
+ * \param mode     AES_ENCRYPT or AES_DECRYPT
+ * \param input    16-byte input block
+ * \param output   16-byte output block
+ */
+void aes_crypt_ecb( aes_context *ctx,
+                    int mode,
+                    const unsigned char input[16],
+                    unsigned char output[16] );
+
+/**
+ * \brief          AES-CBC buffer encryption/decryption
+ *
+ * \param ctx      AES context
+ * \param mode     AES_ENCRYPT or AES_DECRYPT
+ * \param length   length of the input data
+ * \param iv       initialization vector (updated after use)
+ * \param input    buffer holding the input data
+ * \param output   buffer holding the output data
+ */
+void aes_crypt_cbc( aes_context *ctx,
+                    int mode,
+                    int length,
+                    unsigned char iv[16],
+                    const unsigned char *input,
+                    unsigned char *output );
+
+/**
+ * \brief          AES-CFB buffer encryption/decryption
+ *
+ * \param ctx      AES context
+ * \param mode     AES_ENCRYPT or AES_DECRYPT
+ * \param length   length of the input data
+ * \param iv_off   offset in IV (updated after use)
+ * \param iv       initialization vector (updated after use)
+ * \param input    buffer holding the input data
+ * \param output   buffer holding the output data
+ */
+void aes_crypt_cfb( aes_context *ctx,
+                    int mode,
+                    int length,
+                    int *iv_off,
+                    unsigned char iv[16],
+                    const unsigned char *input,
+                    unsigned char *output );
+
+/**
+ * \brief          Checkup routine
+ *
+ * \return         0 if successful, or 1 if the test failed
+ */
+int aes_self_test( int verbose );
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* aes.h */