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146 lines
4.7 KiB
146 lines
4.7 KiB
/* Declarations of functions and data types used for SHA1 sum |
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library functions. |
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Copyright (C) 2000, 2001, 2003, 2005, 2006, 2008, 2010 |
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Free Software Foundation, Inc. |
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This program is free software; you can redistribute it and/or modify it |
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under the terms of the GNU General Public License as published by the |
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Free Software Foundation; either version 3, or (at your option) any |
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later version. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software Foundation, |
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Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ |
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#ifndef SHA1_H |
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# define SHA1_H 1 |
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#include <stdio.h> |
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#if defined HAVE_LIMITS_H || _LIBC |
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# include <limits.h> |
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#endif |
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#include "ansidecl.h" |
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/* The following contortions are an attempt to use the C preprocessor |
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to determine an unsigned integral type that is 32 bits wide. An |
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alternative approach is to use autoconf's AC_CHECK_SIZEOF macro, but |
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doing that would require that the configure script compile and *run* |
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the resulting executable. Locally running cross-compiled executables |
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is usually not possible. */ |
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#ifdef _LIBC |
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# include <sys/types.h> |
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typedef u_int32_t sha1_uint32; |
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typedef uintptr_t sha1_uintptr; |
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#elif defined (HAVE_SYS_TYPES_H) && defined (HAVE_STDINT_H) |
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#include <stdint.h> |
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#include <sys/types.h> |
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typedef uint32_t sha1_uint32; |
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typedef uintptr_t sha1_uintptr; |
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#else |
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# define INT_MAX_32_BITS 2147483647 |
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/* If UINT_MAX isn't defined, assume it's a 32-bit type. |
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This should be valid for all systems GNU cares about because |
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that doesn't include 16-bit systems, and only modern systems |
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(that certainly have <limits.h>) have 64+-bit integral types. */ |
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# ifndef INT_MAX |
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# define INT_MAX INT_MAX_32_BITS |
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# endif |
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# if INT_MAX == INT_MAX_32_BITS |
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typedef unsigned int sha1_uint32; |
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# else |
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# if SHRT_MAX == INT_MAX_32_BITS |
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typedef unsigned short sha1_uint32; |
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# else |
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# if LONG_MAX == INT_MAX_32_BITS |
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typedef unsigned long sha1_uint32; |
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# else |
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/* The following line is intended to evoke an error. |
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Using #error is not portable enough. */ |
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"Cannot determine unsigned 32-bit data type." |
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# endif |
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# endif |
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# endif |
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#endif |
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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/* Structure to save state of computation between the single steps. */ |
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struct sha1_ctx |
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{ |
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sha1_uint32 A; |
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sha1_uint32 B; |
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sha1_uint32 C; |
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sha1_uint32 D; |
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sha1_uint32 E; |
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sha1_uint32 total[2]; |
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sha1_uint32 buflen; |
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sha1_uint32 buffer[32]; |
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}; |
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/* Initialize structure containing state of computation. */ |
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extern void sha1_init_ctx (struct sha1_ctx *ctx); |
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/* Starting with the result of former calls of this function (or the |
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initialization function update the context for the next LEN bytes |
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starting at BUFFER. |
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It is necessary that LEN is a multiple of 64!!! */ |
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extern void sha1_process_block (const void *buffer, size_t len, |
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struct sha1_ctx *ctx); |
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/* Starting with the result of former calls of this function (or the |
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initialization function update the context for the next LEN bytes |
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starting at BUFFER. |
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It is NOT required that LEN is a multiple of 64. */ |
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extern void sha1_process_bytes (const void *buffer, size_t len, |
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struct sha1_ctx *ctx); |
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/* Process the remaining bytes in the buffer and put result from CTX |
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in first 20 bytes following RESBUF. The result is always in little |
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endian byte order, so that a byte-wise output yields to the wanted |
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ASCII representation of the message digest. |
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IMPORTANT: On some systems it is required that RESBUF be correctly |
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aligned for a 32 bits value. */ |
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extern void *sha1_finish_ctx (struct sha1_ctx *ctx, void *resbuf); |
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/* Put result from CTX in first 20 bytes following RESBUF. The result is |
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always in little endian byte order, so that a byte-wise output yields |
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to the wanted ASCII representation of the message digest. |
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IMPORTANT: On some systems it is required that RESBUF is correctly |
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aligned for a 32 bits value. */ |
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extern void *sha1_read_ctx (const struct sha1_ctx *ctx, void *resbuf); |
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/* Compute SHA1 message digest for bytes read from STREAM. The |
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resulting message digest number will be written into the 20 bytes |
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beginning at RESBLOCK. */ |
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extern int sha1_stream (FILE *stream, void *resblock); |
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/* Compute SHA1 message digest for LEN bytes beginning at BUFFER. The |
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result is always in little endian byte order, so that a byte-wise |
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output yields to the wanted ASCII representation of the message |
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digest. */ |
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extern void *sha1_buffer (const char *buffer, size_t len, void *resblock); |
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#ifdef __cplusplus |
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} |
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#endif |
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#endif
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