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76 lines
2.5 KiB
C
76 lines
2.5 KiB
C
/* sha.h - Declaration of functions and datatypes for SHA1 sum computing
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library functions.
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Copyright (C) 1999, Scott G. Miller
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*/
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#ifndef _SHA_H
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# define _SHA_H 1
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# include <stdio.h>
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# include "md5.h"
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/* Structure to save state of computation between the single steps. */
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struct sha_ctx
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{
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md5_uint32 A;
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md5_uint32 B;
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md5_uint32 C;
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md5_uint32 D;
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md5_uint32 E;
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md5_uint32 total[2];
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md5_uint32 buflen;
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char buffer[128];
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};
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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 sha_process_block __P ((const void *buffer, size_t len,
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struct sha_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 sha_process_bytes __P((const void *buffer, size_t len,
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struct sha_ctx *ctx));
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/* Initialize structure containing state of computation. */
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extern void sha_init_ctx __P ((struct sha_ctx *ctx));
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/* Process the remaining bytes in the buffer and put result from CTX
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in first 16 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 is correctly
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aligned for a 32 bits value. */
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extern void *sha_finish_ctx __P ((struct sha_ctx *ctx, void *resbuf));
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/* Put result from CTX in first 16 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 *sha_read_ctx __P ((const struct sha_ctx *ctx, void *resbuf));
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/* Compute MD5 message digest for bytes read from STREAM. The
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resulting message digest number will be written into the 16 bytes
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beginning at RESBLOCK. */
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extern int sha_stream __P ((FILE *stream, void *resblock));
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/* Compute MD5 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 *sha_buffer __P ((const char *buffer, size_t len, void *resblock));
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#endif
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