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libgimpmath/Makefile.am libgimpmath/gimpmath.h libgimpmath/gimpmd5.[ch] 

2002-02-11  Sven Neumann  <sven@gimp.org>

	* libgimpmath/Makefile.am
	* libgimpmath/gimpmath.h
	* libgimpmath/gimpmd5.[ch]
	* libgimpmath/test-md5.c: added MD5 digest algorithm (based on code
	taken from evolution). We will need this to implement the thumbnail
	standard (http://triq.net/~pearl/thumb-spec.php).
This commit is contained in:
Sven Neumann 2002-02-11 22:48:54 +00:00 committed by Sven Neumann
parent 9e2f662a6d
commit 2c2ca836fd
7 changed files with 431 additions and 0 deletions
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9
ChangeLog
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@ -1,3 +1,12 @@
2002-02-11 Sven Neumann <sven@gimp.org>
* libgimpmath/Makefile.am
* libgimpmath/gimpmath.h
* libgimpmath/gimpmd5.[ch]
* libgimpmath/test-md5.c: added MD5 digest algorithm (based on code
taken from evolution). We will need this to implement the thumbnail
standard (http://triq.net/~pearl/thumb-spec.php).
2002-02-11 Michael Natterer <mitch@gimp.org>
* app/gimprc.[ch]

1
libgimpmath/.cvsignore
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@ -1,6 +1,7 @@
Makefile
Makefile.in
makefile.mingw
test-md5
*.lo
_libs
.libs

20
libgimpmath/Makefile.am
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@ -29,6 +29,8 @@ libgimpmath_1_3_la_SOURCES = @STRIP_BEGIN@ \
gimpmathtypes.h \
gimpmatrix.c \
gimpmatrix.h \
gimpmd5.c \
gimpmd5.h \
gimpvector.c \
gimpvector.h \
@STRIP_END@
@ -37,6 +39,7 @@ libgimpmathinclude_HEADERS = @STRIP_BEGIN@ \
gimpmath.h \
gimpmathtypes.h \
gimpmatrix.h \
gimpmd5.h \
gimpvector.h \
@STRIP_END@
@ -47,3 +50,20 @@ libgimpmath_1_3_la_LDFLAGS = @STRIP_BEGIN@ \
@STRIP_END@
libgimpmath_1_3_la_LIBADD = $(GLIB_LIBS) -lm
#
# test programs, not to be built by default and never installed
#
TESTS = test-md5
EXTRA_PROGRAMS = test-md5
test_md5_DEPENDENCIES = \
$(top_builddir)/libgimpmath/libgimpmath-$(LT_RELEASE).la
test_md5_LDADD = @STRIP_BEGIN@ \
$(GLIB_LIBS) \
$(test_md5_DEPENDENCIES) \
@STRIP_END@

1
libgimpmath/gimpmath.h
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@ -35,6 +35,7 @@
#include <libgimpmath/gimpmathtypes.h>
#include <libgimpmath/gimpmatrix.h>
#include <libgimpmath/gimpmd5.h>
#include <libgimpmath/gimpvector.h>
G_BEGIN_DECLS

302
libgimpmath/gimpmd5.c Normal file
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/* LIBGIMP - The GIMP Library
*
* gimpmd5.c
*
* This code implements the MD5 message-digest algorithm.
* The algorithm is due to Ron Rivest. This code was
* written by Colin Plumb in 1993, no copyright is claimed.
* This code is in the public domain; do with it what you wish.
*
* Equivalent code is available from RSA Data Security, Inc.
* This code has been tested against that, and is equivalent,
* except that you don't need to include two pages of legalese
* with every copy.
*
* GIMPified 2002 by Sven Neumann <sven@gimp.org>
*/
/* parts of this file are :
* Written March 1993 by Branko Lankester
* Modified June 1993 by Colin Plumb for altered md5.c.
* Modified October 1995 by Erik Troan for RPM
*/
#include "config.h"
#include <string.h>
#include <glib.h>
#include "gimpmd5.h"
typedef struct _GimpMD5Context GimpMD5Context;
struct _GimpMD5Context
{
guint32 buf[4];
guint32 bits[2];
guchar in[64];
};
static void gimp_md5_init (GimpMD5Context *ctx);
static void gimp_md5_transform (guint32 buf[4],
const guint32 in[16]);
static void gimp_md5_update (GimpMD5Context *ctx,
const guchar *buf,
guint32 len);
static void gimp_md5_final (GimpMD5Context *ctx,
guchar digest[16]);
/**
* gimp_md5_get_digest:
* @buffer: byte buffer
* @buffer_size: buffer size (in bytes)
* @digest: 16 bytes buffer receiving the hash code.
*
* Get the md5 hash of a buffer. The result is put in the 16 bytes
* buffer @digest.
*
* The MD5 algorithm takes as input a message of arbitrary length and
* produces as output a 128-bit "fingerprint" or "message digest" of
* the input. It is conjectured that it is computationally infeasible
* to produce two messages having the same message digest, or to
* produce any message having a given prespecified target message
* digest. For more information see RFC 1321.
**/
void
gimp_md5_get_digest (const gchar *buffer,
gint buffer_size,
guchar digest[16])
{
GimpMD5Context ctx;
gimp_md5_init (&ctx);
gimp_md5_update (&ctx, buffer, buffer_size);
gimp_md5_final (&ctx, digest);
}
static inline void
byte_reverse (guint32 *buf,
guint32 longs)
{
#if G_BYTE_ORDER != G_LITTLE_ENDIAN
do
{
*buf = GINT32_TO_LE (*buf);
buf++;
}
while (--longs);
#endif
}
static void
gimp_md5_init (GimpMD5Context *ctx)
{
ctx->buf[0] = 0x67452301;
ctx->buf[1] = 0xefcdab89;
ctx->buf[2] = 0x98badcfe;
ctx->buf[3] = 0x10325476;
ctx->bits[0] = 0;
ctx->bits[1] = 0;
}
static void
gimp_md5_update (GimpMD5Context *ctx,
const guchar *buf,
guint32 len)
{
guint32 t;
/* Update bitcount */
t = ctx->bits[0];
if ((ctx->bits[0] = t + ((guint32) len << 3)) < t)
ctx->bits[1]++; /* Carry from low to high */
ctx->bits[1] += len >> 29;
t = (t >> 3) & 0x3f;
/* Handle any leading odd-sized chunks */
if (t)
{
guchar *p = (guchar *) ctx->in + t;
t = 64 - t;
if (len < t)
{
memcpy (p, buf, len);
return;
}
memcpy (p, buf, t);
byte_reverse ((guint32 *) ctx->in, 16);
gimp_md5_transform (ctx->buf, (guint32 *) ctx->in);
buf += t;
len -= t;
}
/* Process data in 64-byte chunks */
while (len >= 64)
{
memcpy (ctx->in, buf, 64);
byte_reverse ((guint32 *) ctx->in, 16);
gimp_md5_transform (ctx->buf, (guint32 *) ctx->in);
buf += 64;
len -= 64;
}
/* Handle any remaining bytes of data. */
memcpy (ctx->in, buf, len);
}
static void
gimp_md5_final (GimpMD5Context *ctx,
guchar digest[16])
{
guint32 count;
guchar *p;
/* Compute number of bytes mod 64 */
count = (ctx->bits[0] >> 3) & 0x3F;
/* Set the first char of padding to 0x80. This is safe since there is
always at least one byte free */
p = ctx->in + count;
*p++ = 0x80;
/* Bytes of padding needed to make 64 bytes */
count = 64 - 1 - count;
/* Pad out to 56 mod 64 */
if (count < 8)
{
/* Two lots of padding: Pad the first block to 64 bytes */
memset (p, 0, count);
byte_reverse ((guint32 *) ctx->in, 16);
gimp_md5_transform (ctx->buf, (guint32 *) ctx->in);
/* Now fill the next block with 56 bytes */
memset (ctx->in, 0, 56);
}
else
{
/* Pad block to 56 bytes */
memset (p, 0, count - 8);
}
byte_reverse ((guint32 *) ctx->in, 14);
/* Append length in bits and transform */
((guint32 *) ctx->in)[14] = ctx->bits[0];
((guint32 *) ctx->in)[15] = ctx->bits[1];
gimp_md5_transform (ctx->buf, (guint32 *) ctx->in);
byte_reverse (ctx->buf, 4);
memcpy (digest, ctx->buf, 16);
}
/* The four core functions - F1 is optimized somewhat */
/* #define F1(x, y, z) (x & y | ~x & z) */
#define F1(x, y, z) (z ^ (x & (y ^ z)))
#define F2(x, y, z) F1(z, x, y)
#define F3(x, y, z) (x ^ y ^ z)
#define F4(x, y, z) (y ^ (x | ~z))
/* This is the central step in the MD5 algorithm. */
#define MD5STEP(f, w, x, y, z, data, s) \
( w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x )
/*
* The core of the MD5 algorithm, this alters an existing MD5 hash to
* reflect the addition of 16 longwords of new data. md5_Update blocks
* the data and converts bytes into longwords for this routine.
*/
static void
gimp_md5_transform (guint32 buf[4],
const guint32 in[16])
{
register guint32 a, b, c, d;
a = buf[0];
b = buf[1];
c = buf[2];
d = buf[3];
MD5STEP (F1, a, b, c, d, in[0] + 0xd76aa478, 7);
MD5STEP (F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
MD5STEP (F1, c, d, a, b, in[2] + 0x242070db, 17);
MD5STEP (F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
MD5STEP (F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
MD5STEP (F1, d, a, b, c, in[5] + 0x4787c62a, 12);
MD5STEP (F1, c, d, a, b, in[6] + 0xa8304613, 17);
MD5STEP (F1, b, c, d, a, in[7] + 0xfd469501, 22);
MD5STEP (F1, a, b, c, d, in[8] + 0x698098d8, 7);
MD5STEP (F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
MD5STEP (F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
MD5STEP (F1, b, c, d, a, in[11] + 0x895cd7be, 22);
MD5STEP (F1, a, b, c, d, in[12] + 0x6b901122, 7);
MD5STEP (F1, d, a, b, c, in[13] + 0xfd987193, 12);
MD5STEP (F1, c, d, a, b, in[14] + 0xa679438e, 17);
MD5STEP (F1, b, c, d, a, in[15] + 0x49b40821, 22);
MD5STEP (F2, a, b, c, d, in[1] + 0xf61e2562, 5);
MD5STEP (F2, d, a, b, c, in[6] + 0xc040b340, 9);
MD5STEP (F2, c, d, a, b, in[11] + 0x265e5a51, 14);
MD5STEP (F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
MD5STEP (F2, a, b, c, d, in[5] + 0xd62f105d, 5);
MD5STEP (F2, d, a, b, c, in[10] + 0x02441453, 9);
MD5STEP (F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
MD5STEP (F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
MD5STEP (F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
MD5STEP (F2, d, a, b, c, in[14] + 0xc33707d6, 9);
MD5STEP (F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
MD5STEP (F2, b, c, d, a, in[8] + 0x455a14ed, 20);
MD5STEP (F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
MD5STEP (F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
MD5STEP (F2, c, d, a, b, in[7] + 0x676f02d9, 14);
MD5STEP (F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
MD5STEP (F3, a, b, c, d, in[5] + 0xfffa3942, 4);
MD5STEP (F3, d, a, b, c, in[8] + 0x8771f681, 11);
MD5STEP (F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
MD5STEP (F3, b, c, d, a, in[14] + 0xfde5380c, 23);
MD5STEP (F3, a, b, c, d, in[1] + 0xa4beea44, 4);
MD5STEP (F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
MD5STEP (F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
MD5STEP (F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
MD5STEP (F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
MD5STEP (F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
MD5STEP (F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
MD5STEP (F3, b, c, d, a, in[6] + 0x04881d05, 23);
MD5STEP (F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
MD5STEP (F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
MD5STEP (F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
MD5STEP (F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
MD5STEP (F4, a, b, c, d, in[0] + 0xf4292244, 6);
MD5STEP (F4, d, a, b, c, in[7] + 0x432aff97, 10);
MD5STEP (F4, c, d, a, b, in[14] + 0xab9423a7, 15);
MD5STEP (F4, b, c, d, a, in[5] + 0xfc93a039, 21);
MD5STEP (F4, a, b, c, d, in[12] + 0x655b59c3, 6);
MD5STEP (F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
MD5STEP (F4, c, d, a, b, in[10] + 0xffeff47d, 15);
MD5STEP (F4, b, c, d, a, in[1] + 0x85845dd1, 21);
MD5STEP (F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
MD5STEP (F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
MD5STEP (F4, c, d, a, b, in[6] + 0xa3014314, 15);
MD5STEP (F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
MD5STEP (F4, a, b, c, d, in[4] + 0xf7537e82, 6);
MD5STEP (F4, d, a, b, c, in[11] + 0xbd3af235, 10);
MD5STEP (F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
MD5STEP (F4, b, c, d, a, in[9] + 0xeb86d391, 21);
buf[0] += a;
buf[1] += b;
buf[2] += c;
buf[3] += d;
}

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libgimpmath/gimpmd5.h Normal file
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/* LIBGIMP - The GIMP Library
*
* gimpmd5.h
*
* This code implements the MD5 message-digest algorithm.
* The algorithm is due to Ron Rivest. This code was
* written by Colin Plumb in 1993, no copyright is claimed.
* This code is in the public domain; do with it what you wish.
*
* Equivalent code is available from RSA Data Security, Inc.
* This code has been tested against that, and is equivalent,
* except that you don't need to include two pages of legalese
* with every copy.
*
* GIMPified 2002 by Sven Neumann <sven@gimp.org>
*/
/* parts of this file are :
* Written March 1993 by Branko Lankester
* Modified June 1993 by Colin Plumb for altered md5.c.
* Modified October 1995 by Erik Troan for RPM
*/
#ifndef __GIMP_MD5_H__
#define __GIMP_MD5_H__
G_BEGIN_DECLS
/* For information look into the C source or the html documentation */
void gimp_md5_get_digest (const gchar *buffer,
gint buffer_size,
guchar digest[16]);
G_END_DECLS
#endif /* __GIMP_MD5_H__ */

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/* A small test program to check our MD5 implementation.
* The test program computes the MD5 digest of some strings
* as given in section A.5 of RFC 1321, reproduced below.
*/
#include <glib.h>
#include <string.h>
#include "gimpmd5.h"
static const gchar * test[7][2] =
{
{ "", "d41d8cd98f00b204e9800998ecf8427e" },
{ "a", "0cc175b9c0f1b6a831c399e269772661" },
{ "abc", "900150983cd24fb0d6963f7d28e17f72" },
{ "message digest", "f96b697d7cb7938d525a2f31aaf161d0" },
{ "abcdefghijklmnopqrstuvwxyz", "c3fcd3d76192e4007dfb496cca67e13b" },
{ "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789", "d174ab98d277d9f5a5611c2c9f419d9f" },
{ "12345678901234567890123456789012345678901234567890123456789012345678901234567890", "57edf4a22be3c955ac49da2e2107b67a" }
};
int
main (void)
{
gboolean correct = TRUE;
guchar digest[16];
gint i, j;
g_print ("Testing the GIMP MD5 implementation ...\n\n");
for (i = 0; i < 7; ++i)
{
gimp_md5_get_digest (test[i][0], strlen (test[i][0]), digest);
g_print ("MD5 (\"%s\") = ", test[i][0]);
for (j = 0; j < 16; j++)
{
guchar buf[4];
g_snprintf (buf, 3, "%02x", digest[j]);
g_print (buf);
if (strncmp (buf, test[i][1] + j*2, 2))
correct = FALSE;
}
g_print ("\n");
if (!correct)
{
g_print
("\nWRONG digest!! Please report to http://bugzilla.gnome.org/\n");
return 1;
}
}
g_print ("\nLooks good.\n\n");
return 0;
}