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Diffstat (limited to 'lib/md5.h')
| -rw-r--r-- | lib/md5.h | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/lib/md5.h b/lib/md5.h new file mode 100644 index 00000000..3c8b8f31 --- /dev/null +++ b/lib/md5.h @@ -0,0 +1,107 @@ +/* Declaration of functions and data types used for MD5 sum computing + library functions. + Copyright (C) 1995,1996,1997,1999-2001,2004,2005,2008 Red Hat, Inc. + This file is part of Red Hat elfutils. + Written by Ulrich Drepper <drepper@redhat.com>, 1995. + + Red Hat elfutils 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; version 2 of the License. + + Red Hat elfutils 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 Red Hat elfutils; if not, write to the Free Software Foundation, + Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA. + + Red Hat elfutils is an included package of the Open Invention Network. + An included package of the Open Invention Network is a package for which + Open Invention Network licensees cross-license their patents. No patent + license is granted, either expressly or impliedly, by designation as an + included package. Should you wish to participate in the Open Invention + Network licensing program, please visit www.openinventionnetwork.com + <http://www.openinventionnetwork.com>. */ + +#ifndef _MD5_H +#define _MD5_H 1 + +#include <limits.h> +#include <stdint.h> +#include <stdio.h> + +#define MD5_DIGEST_SIZE 16 +#define MD5_BLOCK_SIZE 64 + +typedef uint32_t md5_uint32; +typedef uintptr_t md5_uintptr; + +/* Structure to save state of computation between the single steps. */ +struct md5_ctx +{ + md5_uint32 A; + md5_uint32 B; + md5_uint32 C; + md5_uint32 D; + + md5_uint32 total[2]; + md5_uint32 buflen; + char buffer[128] __attribute__ ((__aligned__ (__alignof__ (md5_uint32)))); +}; + +/* + * The following three functions are build up the low level used in + * the functions `md5_stream' and `md5_buffer'. + */ + +/* Initialize structure containing state of computation. + (RFC 1321, 3.3: Step 3) */ +extern void md5_init_ctx (struct md5_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 md5_process_block (const void *buffer, size_t len, + struct md5_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 md5_process_bytes (const void *buffer, size_t len, + struct md5_ctx *ctx); + +/* Process the remaining bytes in the buffer and put result from CTX + in first 16 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 *md5_finish_ctx (struct md5_ctx *ctx, void *resbuf); + + +/* Put result from CTX in first 16 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 *md5_read_ctx (const struct md5_ctx *ctx, void *resbuf); + + +/* Compute MD5 message digest for bytes read from STREAM. The + resulting message digest number will be written into the 16 bytes + beginning at RESBLOCK. */ +extern int md5_stream (FILE *stream, void *resblock); + +/* Compute MD5 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 *md5_buffer (const char *buffer, size_t len, void *resblock); + +#endif /* md5.h */ |