From e2cfa48b0f245bfba610fa843857f5fbe9d9ca81 Mon Sep 17 00:00:00 2001 From: Jim Meyering Date: Sun, 23 Oct 2005 15:53:55 +0000 Subject: from David Madore --- lib/sha256.h | 88 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 88 insertions(+) create mode 100644 lib/sha256.h (limited to 'lib/sha256.h') diff --git a/lib/sha256.h b/lib/sha256.h new file mode 100644 index 000000000..34c3756ca --- /dev/null +++ b/lib/sha256.h @@ -0,0 +1,88 @@ +/* Declarations of functions and data types used for SHA256 and SHA224 sum + library functions. + Copyright (C) 2005 Free Software Foundation, Inc. + + 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 2, 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, write to the Free Software Foundation, + Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ + +#ifndef SHA256_H +# define SHA256_H 1 + +# include +# include "md5.h" + +/* Structure to save state of computation between the single steps. */ +struct sha256_ctx +{ + md5_uint32 state[8]; + + md5_uint32 total[2]; + md5_uint32 buflen; + char buffer[128]; +}; + + +/* Initialize structure containing state of computation. */ +extern void sha256_init_ctx (struct sha256_ctx *ctx); +extern void sha224_init_ctx (struct sha256_ctx *ctx); + +/* Starting with the result of former calls of this function (or the + initialization function update the context for the next LEN bytes + starting at BUFFER. + It is necessary that LEN is a multiple of 64!!! */ +extern void sha256_process_block (const void *buffer, size_t len, + struct sha256_ctx *ctx); + +/* Starting with the result of former calls of this function (or the + initialization function update the context for the next LEN bytes + starting at BUFFER. + It is NOT required that LEN is a multiple of 64. */ +extern void sha256_process_bytes (const void *buffer, size_t len, + struct sha256_ctx *ctx); + +/* Process the remaining bytes in the buffer and put result from CTX + in first 32 (28) bytes following RESBUF. The result is always in little + endian byte order, so that a byte-wise output yields to the wanted + ASCII representation of the message digest. + + IMPORTANT: On some systems it is required that RESBUF be correctly + aligned for a 32 bits value. */ +extern void *sha256_finish_ctx (struct sha256_ctx *ctx, void *resbuf); +extern void *sha224_finish_ctx (struct sha256_ctx *ctx, void *resbuf); + + +/* Put result from CTX in first 32 (28) bytes following RESBUF. The result is + always in little endian byte order, so that a byte-wise output yields + to the wanted ASCII representation of the message digest. + + IMPORTANT: On some systems it is required that RESBUF is correctly + aligned for a 32 bits value. */ +extern void *sha256_read_ctx (const struct sha256_ctx *ctx, void *resbuf); +extern void *sha224_read_ctx (const struct sha256_ctx *ctx, void *resbuf); + + +/* Compute SHA256 (SHA224) message digest for bytes read from STREAM. The + resulting message digest number will be written into the 32 (28) bytes + beginning at RESBLOCK. */ +extern int sha256_stream (FILE *stream, void *resblock); +extern int sha224_stream (FILE *stream, void *resblock); + +/* Compute SHA256 (SHA224) message digest for LEN bytes beginning at BUFFER. The + result is always in little endian byte order, so that a byte-wise + output yields to the wanted ASCII representation of the message + digest. */ +extern void *sha256_buffer (const char *buffer, size_t len, void *resblock); +extern void *sha224_buffer (const char *buffer, size_t len, void *resblock); + +#endif -- cgit v1.2.3-54-g00ecf