forked from Qortal/Brooklyn
132 lines
4.5 KiB
C
132 lines
4.5 KiB
C
/* $Id: sph_sha1.h 216 2010-06-08 09:46:57Z tp $ */
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/**
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* SHA-1 interface.
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*
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* SHA-1 is described in FIPS 180-1 (now superseded by FIPS 180-2, but the
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* description of SHA-1 is still included and has not changed). FIPS
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* standards can be found at: http://csrc.nist.gov/publications/fips/
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*
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* @warning A theoretical collision attack against SHA-1, with work
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* factor 2^63, has been published. SHA-1 should not be used in new
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* protocol designs.
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*
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* ==========================(LICENSE BEGIN)============================
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*
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* Copyright (c) 2007-2010 Projet RNRT SAPHIR
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* ===========================(LICENSE END)=============================
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*
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* @file sph_sha1.h
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* @author Thomas Pornin <thomas.pornin@cryptolog.com>
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*/
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#ifndef SPH_SHA1_H__
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#define SPH_SHA1_H__
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#include <stddef.h>
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#include "sph_types.h"
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/**
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* Output size (in bits) for SHA-1.
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*/
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#define SPH_SIZE_sha1 160
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/**
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* This structure is a context for SHA-1 computations: it contains the
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* intermediate values and some data from the last entered block. Once
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* a SHA-1 computation has been performed, the context can be reused for
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* another computation.
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*
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* The contents of this structure are private. A running SHA-1 computation
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* can be cloned by copying the context (e.g. with a simple
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* <code>memcpy()</code>).
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*/
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typedef struct {
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#ifndef DOXYGEN_IGNORE
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unsigned char buf[64]; /* first field, for alignment */
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sph_u32 val[5];
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#if SPH_64
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sph_u64 count;
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#else
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sph_u32 count_high, count_low;
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#endif
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#endif
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} sph_sha1_context;
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/**
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* Initialize a SHA-1 context. This process performs no memory allocation.
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*
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* @param cc the SHA-1 context (pointer to a <code>sph_sha1_context</code>)
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*/
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void sph_sha1_init(void *cc);
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/**
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* Process some data bytes. It is acceptable that <code>len</code> is zero
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* (in which case this function does nothing).
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*
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* @param cc the SHA-1 context
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* @param data the input data
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* @param len the input data length (in bytes)
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*/
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void sph_sha1(void *cc, const void *data, size_t len);
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/**
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* Terminate the current SHA-1 computation and output the result into the
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* provided buffer. The destination buffer must be wide enough to
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* accomodate the result (20 bytes). The context is automatically
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* reinitialized.
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*
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* @param cc the SHA-1 context
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* @param dst the destination buffer
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*/
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void sph_sha1_close(void *cc, void *dst);
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/**
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* Add a few additional bits (0 to 7) to the current computation, then
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* terminate it and output the result in the provided buffer, which must
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* be wide enough to accomodate the result (20 bytes). If bit number i
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* in <code>ub</code> has value 2^i, then the extra bits are those
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* numbered 7 downto 8-n (this is the big-endian convention at the byte
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* level). The context is automatically reinitialized.
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*
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* @param cc the SHA-1 context
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* @param ub the extra bits
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* @param n the number of extra bits (0 to 7)
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* @param dst the destination buffer
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*/
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void sph_sha1_addbits_and_close(void *cc, unsigned ub, unsigned n, void *dst);
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/**
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* Apply the SHA-1 compression function on the provided data. The
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* <code>msg</code> parameter contains the 16 32-bit input blocks,
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* as numerical values (hence after the big-endian decoding). The
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* <code>val</code> parameter contains the 5 32-bit input blocks for
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* the compression function; the output is written in place in this
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* array.
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*
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* @param msg the message block (16 values)
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* @param val the function 160-bit input and output
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*/
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void sph_sha1_comp(const sph_u32 msg[16], sph_u32 val[5]);
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#endif
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