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daa8cb06f0
Trf is a TCL extension library. It extends the language at the C-level with so-called ``transformer''-procedures. The package is able to intercept all read/write operations on designated channels, thus giving it the ability to transform the buffer contents as desired. This allows things like transparent encryption, compression, charset recoding, etc. Build upon this framework (and as proof of concept) a collection of tcl-level commands was implemented, most of them related to cryptography. WWW: http://www.oche.de/~akupries/soft/trf/
197 lines
4.5 KiB
Text
197 lines
4.5 KiB
Text
--- generic/sha.c Wed Aug 9 15:13:18 2000
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+++ generic/sha.c Fri Feb 8 11:22:17 2002
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@@ -30,34 +30,6 @@
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#include "transformInt.h"
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-#ifndef WORDS_BIGENDIAN
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-#define LITTLE_ENDIAN
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-#endif
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-
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-#include "sha/sha.h"
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-
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-/*
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- * Generator description
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- * ---------------------
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- *
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- * The SHA alogrithm is used to compute a cryptographically strong
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- * message digest.
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- */
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-
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-#define DIGEST_SIZE (SHA_DIGESTSIZE)
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-#define CTX_TYPE sha_trf_info
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-#define CHUNK_SIZE 256
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-
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-/* We cannot use SHA_INFO directly as context cause 'sha_update' handles
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- * a chunk smaller then CHUNK_SIZE bytes correct if and only if it is
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- * the last chunk. This forces us to buffer the incoming bytes till a chunk
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- * is complete before doing an update.
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- */
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-
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-typedef struct _sha_trf_info {
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- SHA_INFO s;
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- unsigned short count;
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- unsigned char buf [CHUNK_SIZE]; /* SHA block */
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-} sha_trf_info;
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-
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+#include <sys/types.h>
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+#include <sha.h>
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/*
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@@ -76,9 +48,9 @@
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static Trf_MessageDigestDescription mdDescription = { /* THREADING: constant, read-only => safe */
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"sha",
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- sizeof (CTX_TYPE),
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- DIGEST_SIZE,
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- MDsha_Start,
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+ sizeof (SHA_CTX),
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+ SHA_DIGEST_LENGTH,
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+ SHA_Init,
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MDsha_Update,
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- MDsha_UpdateBuf,
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+ SHA_Update,
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MDsha_Final,
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NULL
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@@ -113,33 +85,4 @@
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*------------------------------------------------------*
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*
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- * MDsha_Start --
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- *
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- * ------------------------------------------------*
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- * Initialize the internal state of the message
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- * digest generator.
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- * ------------------------------------------------*
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- *
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- * Sideeffects:
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- * As of the called procedure.
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- *
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- * Result:
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- * None.
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- *
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- *------------------------------------------------------*
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- */
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-
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-static void
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-MDsha_Start (context)
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-VOID* context;
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-{
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- sha_trf_info* s = (sha_trf_info*) context;
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-
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- memset (s, '\0', sizeof (sha_trf_info));
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- sha_init (&s->s);
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-}
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-
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-/*
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- *------------------------------------------------------*
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- *
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* MDsha_Update --
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*
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@@ -163,79 +106,7 @@
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unsigned int character;
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{
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- sha_trf_info* s = (sha_trf_info*) context;
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-
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- s->buf [s->count] = character;
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- s->count ++;
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+ unsigned char buf = character;
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- if (s->count == CHUNK_SIZE) {
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- sha_update (&s->s, s->buf, s->count);
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- s->count = 0;
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- }
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-}
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-
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-/*
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- *------------------------------------------------------*
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- *
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- * MDsha_UpdateBuf --
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- *
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- * ------------------------------------------------*
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- * Update the internal state of the message digest
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- * generator for a character buffer.
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- * ------------------------------------------------*
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- *
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- * Sideeffects:
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- * As of the called procedure.
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- *
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- * Result:
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- * None.
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- *
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- *------------------------------------------------------*
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- */
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-
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-static void
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-MDsha_UpdateBuf (context, buffer, bufLen)
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-VOID* context;
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-unsigned char* buffer;
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-int bufLen;
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-{
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- sha_trf_info* s = (sha_trf_info*) context;
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-
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- if ((s->count + bufLen) < CHUNK_SIZE) {
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- /*
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- * Not enough for full chunk. Remember incoming
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- * data and wait for another call containing more data.
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- */
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-
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- memcpy ((VOID*) (s->buf + s->count), (VOID*) buffer, bufLen);
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- s->count += bufLen;
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- } else {
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- /*
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- * Complete chunk with incoming data, update digest,
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- * then use all chunks contained in the buffer. Remember
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- * an incomplete chunk and wait for further calls.
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- */
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-
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- int k = CHUNK_SIZE - s->count;
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-
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- if (k < CHUNK_SIZE) {
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- memcpy ((VOID*) (s->buf + s->count), (VOID*) buffer, k);
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-
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- sha_update (&s->s, s->buf, CHUNK_SIZE);
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-
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- buffer += k;
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- bufLen -= k;
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- } /* k == CHUNK_SIZE => internal buffer was empty, so skip it entirely */
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-
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- while (bufLen > CHUNK_SIZE) {
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- sha_update (&s->s, buffer, CHUNK_SIZE);
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-
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- buffer += CHUNK_SIZE;
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- bufLen -= CHUNK_SIZE;
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- }
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-
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- s->count = bufLen;
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- if (bufLen > 0)
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- memcpy ((VOID*) s->buf, (VOID*) buffer, bufLen);
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- }
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+ SHA_Update ((SHA_CTX*)context, &buf, 1);
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}
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@@ -264,26 +135,4 @@
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VOID* digest;
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{
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- sha_trf_info* s = (sha_trf_info*) context;
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-
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- if (s->count > 0) {
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- sha_update (&s->s, s->buf, s->count);
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- }
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-
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- sha_final (&s->s);
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-
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-#ifndef WORDS_BIGENDIAN
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- Trf_FlipRegisterLong (s->s.digest, SHA_DIGESTSIZE);
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-#endif
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-
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- memcpy (digest, s->s.digest, SHA_DIGESTSIZE);
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+ SHA_Final(digest, context);
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}
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-
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-/*
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- * External code from here on.
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- *
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- * To make smaller object code, but run a little slower, don't use UNROLL_LOOPS.
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- * To use NIST's modified SHA of 7/11/94, define USE_MODIFIED_SHA
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- */
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-
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-#define UNROLL_LOOPS
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-#include "sha/sha.c"
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