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[avr-crypto-lib.git] / shabea / sha256.h

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+/* sha256.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       sha256.h
+ * \author  Daniel Otte 
+ * \date    2006-05-16
+ * \license    GPLv3 or later
+ * 
+ */
+
+#ifndef SHA256_H_
+#define SHA256_H_
+
+#define __LITTLE_ENDIAN__
+
+
+#include <stdint.h>
+
+/** \def SHA256_HASH_BITS
+ * defines the size of a SHA-256 hash value in bits
+ */
+
+/** \def SHA256_HASH_BYTES
+ * defines the size of a SHA-256 hash value in bytes
+ */
+
+/** \def SHA256_BLOCK_BITS
+ * defines the size of a SHA-256 input block in bits
+ */
+
+/** \def SHA256_BLOCK_BYTES
+ * defines the size of a SHA-256 input block in bytes
+ */
+
+#define SHA256_HASH_BITS  256
+#define SHA256_HASH_BYTES (SHA256_HASH_BITS/8)
+#define SHA256_BLOCK_BITS 512
+#define SHA256_BLOCK_BYTES (SHA256_BLOCK_BITS/8)
+
+/** \typedef sha256_ctx_t
+ * \brief SHA-256 context type
+ * 
+ * A variable of this type may hold the state of a SHA-256 hashing process
+ */
+typedef struct {
+       uint32_t h[8];
+       uint64_t length;
+} sha256_ctx_t;
+
+/** \typedef sha256_hash_t
+ * \brief SHA-256 hash value type
+ * 
+ * A variable of this type may hold the hash value produced by the
+ * sha256_ctx2hash(sha256_hash_t* dest, const sha256_ctx_t* state) function.
+ */
+typedef uint8_t sha256_hash_t[SHA256_HASH_BYTES];
+
+/** \fn void sha256_init(sha256_ctx_t *state)
+ * \brief initialise a SHA-256 context
+ * 
+ * This function sets a ::sha256_ctx_t to the initial values for hashing.
+ * \param state pointer to the SHA-256 hashing context
+ */
+void sha256_init(sha256_ctx_t *state);
+
+/** \fn void sha256_nextBlock (sha256_ctx_t* state, const void* block)
+ * \brief update the context with a given block
+ * 
+ * This function updates the SHA-256 hash context by processing the given block
+ * of fixed length.
+ * \param state pointer to the SHA-256 hash context
+ * \param block pointer to the block of fixed length (512 bit = 64 byte)
+ */
+void sha256_nextBlock (sha256_ctx_t* state, const void* block);
+
+/** \fn void sha256_lastBlock(sha256_ctx_t* state, const void* block, uint16_t length_b)
+ * \brief finalize the context with the given block 
+ * 
+ * This function finalizes the SHA-256 hash context by processing the given block
+ * of variable length.
+ * \param state pointer to the SHA-256 hash context
+ * \param block pointer to the block of fixed length (512 bit = 64 byte)
+ * \param length_b the length of the block in bits
+ */
+void sha256_lastBlock(sha256_ctx_t* state, const void* block, uint16_t length_b);
+
+/** \fn void sha256_ctx2hash(sha256_hash_t* dest, const sha256_ctx_t* state)
+ * \brief convert the hash state into the hash value
+ * This function reads the context and writes the hash value to the destination
+ * \param dest pointer to the location where the hash value should be written
+ * \param state pointer to the SHA-256 hash context
+ */
+void sha256_ctx2hash(sha256_hash_t* dest, const sha256_ctx_t* state);
+
+/** \fn void sha256(sha256_hash_t* dest, const void* msg, uint32_t length_b)
+ * \brief simple SHA-256 hashing function for direct hashing
+ * 
+ * This function automaticaly hashes a given message of arbitary length with
+ * the SHA-256 hashing algorithm.
+ * \param dest pointer to the location where the hash value is going to be written to
+ * \param msg pointer to the message thats going to be hashed
+ * \param length_b length of the message in bits
+ */
+void sha256(sha256_hash_t* dest, const void* msg, uint32_t length_b);
+
+#endif /*SHA256_H_*/