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[avr-crypto-lib.git] / shacal1 / sha1.h

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+/* sha1.h */
+/*
+    This file is part of the AVR-Crypto-Lib.
+    Copyright (C) 2008  Daniel Otte (daniel.otte@rub.de)
+
+    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 3 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, see <http://www.gnu.org/licenses/>.
+*/
+/**
+ * \file       sha1.h
+ * \author     Daniel Otte
+ * \email   daniel.otte@rub.de
+ * \date       2006-10-08
+ * \license GPLv3 or later
+ * \brief   SHA-1 declaration.
+ * \ingroup SHA-1
+ * 
+ */
+ 
+#ifndef SHA1_H_
+#define SHA1_H_
+
+#include <stdint.h>
+/** \def SHA1_HASH_BITS
+ * definees the size of a SHA-1 hash in bits 
+ */
+
+/** \def SHA1_HASH_BYTES
+ * definees the size of a SHA-1 hash in bytes 
+ */
+
+/** \def SHA1_BLOCK_BITS
+ * definees the size of a SHA-1 input block in bits 
+ */
+
+/** \def SHA1_BLOCK_BYTES
+ * definees the size of a SHA-1 input block in bytes 
+ */
+#define SHA1_HASH_BITS  160
+#define SHA1_HASH_BYTES (SHA1_HASH_BITS/8)
+#define SHA1_BLOCK_BITS 512
+#define SHA1_BLOCK_BYTES (SHA1_BLOCK_BITS/8)
+
+/** \typedef sha1_ctx_t
+ * \brief SHA-1 context type
+ * 
+ * A vatiable of this type may hold the state of a SHA-1 hashing process
+ */
+typedef struct {
+       uint32_t h[5];
+       uint64_t length;
+} sha1_ctx_t;
+
+/** \typedef sha1_hash_t
+ * \brief hash value type
+ * A variable of this type may hold a SHA-1 hash value 
+ */
+typedef uint8_t sha1_hash_t[SHA1_HASH_BITS/8];
+
+/** \fn sha1_init(sha1_ctx_t *state)
+ * \brief initializes a SHA-1 context
+ * This function sets a ::sha1_ctx_t variable to the initialization vector
+ * for SHA-1 hashing.
+ * \param state pointer to the SHA-1 context variable
+ */
+void sha1_init(sha1_ctx_t *state);
+
+/** \fn sha1_nextBlock(sha1_ctx_t *state, const void* block)
+ *  \brief process one input block
+ * This function processes one input block and updates the hash context 
+ * accordingly
+ * \param state pointer to the state variable to update
+ * \param block pointer to the message block to process
+ */
+void sha1_nextBlock (sha1_ctx_t *state, const void* block);
+
+/** \fn sha1_lastBlock(sha1_ctx_t *state, const void* block, uint16_t length_b)
+ * \brief processes the given block and finalizes the context
+ * This function processes the last block in a SHA-1 hashing process.
+ * The block should have a maximum length of a single input block.
+ * \param state pointer to the state variable to update and finalize
+ * \param block pointer to themessage block to process
+ * \param length_b length of the message block in bits  
+ */
+void sha1_lastBlock (sha1_ctx_t *state, const void* block, uint16_t length_b);
+
+/** \fn sha1_ctx2hash(sha1_hash_t *dest, sha1_ctx_t *state)
+ * \brief convert a state variable into an actual hash value
+ * Writes the hash value corresponding to the state to the memory pointed by dest.
+ * \param dest pointer to the hash value destination
+ * \param state pointer to the hash context
+ */ 
+void sha1_ctx2hash (sha1_hash_t *dest, sha1_ctx_t *state);
+
+/** \fn sha1(sha1_hash_t *dest, const void* msg, uint32_t length_b)
+ * \brief hashing a message which in located entirely in RAM
+ * This function automatically hashes a message which is entirely in RAM with
+ * the SHA-1 hashing algorithm.
+ * \param dest pointer to the hash value destination
+ * \param msg  pointer to the message which should be hashed
+ * \param length_b length of the message in bits
+ */ 
+void sha1(sha1_hash_t *dest, const void* msg, uint32_t length_b);
+
+
+
+#endif /*SHA1_H_*/