[src/trunk]: src/sys in-kernel MD4 implementation, from libc

[deberg <deberg%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/c51a787d89a7
branches:  trunk
changeset: 500210:c51a787d89a7
user:      deberg <deberg%NetBSD.org@localhost>
date:      Fri Dec 08 06:29:23 2000 +0000

description:
in-kernel MD4 implementation, from libc

diffstat:

 sys/lib/libkern/md4c.c |  317 +++++++++++++++++++++++++++++++++++++++++++++++++
 sys/sys/md4.h          |   56 ++++++++
 2 files changed, 373 insertions(+), 0 deletions(-)

diffs (truncated from 381 to 300 lines):

diff -r 425b71b0c10a -r c51a787d89a7 sys/lib/libkern/md4c.c
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/lib/libkern/md4c.c    Fri Dec 08 06:29:23 2000 +0000
@@ -0,0 +1,317 @@
+/*     $NetBSD: md4c.c,v 1.1 2000/12/08 06:29:24 deberg Exp $  */
+
+/*
+ * This file is derived from the RSA Data Security, Inc. MD4 Message-Digest
+ * Algorithm and has been modified by Jason R. Thorpe <thorpej%NetBSD.ORG@localhost>
+ * for portability and formatting.
+ */
+
+/*
+ * Copyright (C) 1990-2, RSA Data Security, Inc. All rights reserved.
+ *
+ * License to copy and use this software is granted provided that it
+ * is identified as the "RSA Data Security, Inc. MD4 Message-Digest
+ * Algorithm" in all material mentioning or referencing this software
+ * or this function.
+ *
+ * License is also granted to make and use derivative works provided
+ * that such works are identified as "derived from the RSA Data
+ * Security, Inc. MD4 Message-Digest Algorithm" in all material
+ * mentioning or referencing the derived work.
+ *
+ * RSA Data Security, Inc. makes no representations concerning either
+ * the merchantability of this software or the suitability of this
+ * software for any particular purpose. It is provided "as is"
+ * without express or implied warranty of any kind.
+ *
+ * These notices must be retained in any copies of any part of this
+ * documentation and/or software.
+ */
+
+#if defined(_KERNEL) || defined(_STANDALONE)
+#include <sys/param.h>
+#include <sys/md4.h>
+#include <lib/libkern/libkern.h>
+#define _DIAGASSERT(x) (void)0
+#else
+#include <sys/types.h>
+
+#include <assert.h>
+#include <md4.h>
+#include <string.h>
+#endif /* _KERNEL || _STANDALONE */
+
+typedef unsigned char *POINTER;
+typedef u_int16_t UINT2;
+typedef u_int32_t UINT4;
+
+/*
+ * Constants for MD4Transform routine.
+ */
+#define S11 3
+#define S12 7
+#define S13 11
+#define S14 19
+#define S21 3
+#define S22 5
+#define S23 9
+#define S24 13
+#define S31 3
+#define S32 9
+#define S33 11
+#define S34 15
+
+static void MD4Transform __P((UINT4 [4], const unsigned char [64]));
+
+static void Encode __P((unsigned char *, UINT4 *, unsigned int));
+static void Decode __P((UINT4 *, const unsigned char *, unsigned int));
+
+static const unsigned char PADDING[64] = {
+       0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
+};
+
+/*
+ * F, G and H are basic MD4 functions.
+ */
+#define F(x, y, z)     (((x) & (y)) | ((~x) & (z)))
+#define G(x, y, z)     (((x) & (y)) | ((x) & (z)) | ((y) & (z)))
+#define H(x, y, z)     ((x) ^ (y) ^ (z))
+
+/*
+ * ROTATE_LEFT rotates x left n bits.
+ */
+#define ROTATE_LEFT(x, n)      (((x) << (n)) | ((x) >> (32-(n))))
+
+/*
+ * FF, GG and HH are transformations for rounds 1, 2 and 3.
+ * Rotation is separate from addition to prevent recomputation.
+ */
+#define FF(a, b, c, d, x, s) { \
+       (a) += F ((b), (c), (d)) + (x); \
+       (a) = ROTATE_LEFT ((a), (s)); \
+}
+
+#define GG(a, b, c, d, x, s) { \
+       (a) += G ((b), (c), (d)) + (x) + (UINT4)0x5a827999; \
+       (a) = ROTATE_LEFT ((a), (s)); \
+}
+
+#define HH(a, b, c, d, x, s) { \
+       (a) += H ((b), (c), (d)) + (x) + (UINT4)0x6ed9eba1; \
+       (a) = ROTATE_LEFT ((a), (s)); \
+}
+
+#if !defined(_KERNEL) && !defined(_STANDALONE) && defined(__weak_alias)
+__weak_alias(MD4Init,_MD4Init)
+__weak_alias(MD4Update,_MD4Update)
+__weak_alias(MD4Final,_MD4Final)
+#endif
+
+/*
+ * MD4 initialization. Begins an MD4 operation, writing a new context.
+ */
+void
+MD4Init(context)
+       MD4_CTX *context;               /* context */
+{
+
+       _DIAGASSERT(context != 0);
+
+       context->count[0] = context->count[1] = 0;
+
+       /* Load magic initialization constants. */
+       context->state[0] = 0x67452301;
+       context->state[1] = 0xefcdab89;
+       context->state[2] = 0x98badcfe;
+       context->state[3] = 0x10325476;
+}
+
+/*
+ * MD4 block update operation.  Continues an MD4 message-digest
+ * operation, processing another message block, and updating the
+ * context.
+ */
+void
+MD4Update (context, input, inputLen)
+       MD4_CTX *context;               /* context */
+       const unsigned char *input;     /* input block */
+       unsigned int inputLen;          /* length of input block */
+{
+       unsigned int i, idx, partLen;
+
+       _DIAGASSERT(context != 0);
+       _DIAGASSERT(input != 0);
+
+       /* Compute number of bytes mod 64 */
+       idx = (unsigned int)((context->count[0] >> 3) & 0x3F);
+
+       /* Update number of bits */
+       if ((context->count[0] += ((UINT4)inputLen << 3))
+           < ((UINT4)inputLen << 3))
+               context->count[1]++;
+       context->count[1] += ((UINT4)inputLen >> 29);
+
+       partLen = 64 - idx;
+
+       /* Transform as many times as possible. */
+       if (inputLen >= partLen) {
+               memcpy(&context->buffer[idx], input, partLen);
+               MD4Transform(context->state, context->buffer);
+
+               for (i = partLen; i + 63 < inputLen; i += 64)
+                       MD4Transform(context->state, &input[i]);
+
+               idx = 0;
+       } else
+               i = 0;
+
+       /* Buffer remaining input */
+       memcpy(&context->buffer[idx], &input[i], inputLen - i);
+}
+
+/*
+ * MD4 finalization.  Ends an MD4 message-digest operation, writing the
+ * message digest and zeroing the context.
+ */
+void
+MD4Final (digest, context)
+       unsigned char digest[16];       /* message digest */
+       MD4_CTX *context;               /* context */
+{
+       unsigned char bits[8];
+       unsigned int idx, padLen;
+
+       _DIAGASSERT(digest != 0);
+       _DIAGASSERT(context != 0);
+
+       /* Save number of bits */
+       Encode(bits, context->count, 8);
+
+       /* Pad out to 56 mod 64. */
+       idx = (unsigned int)((context->count[0] >> 3) & 0x3f);
+       padLen = (idx < 56) ? (56 - idx) : (120 - idx);
+       MD4Update(context, PADDING, padLen);
+
+       /* Append length (before padding) */
+       MD4Update(context, bits, 8);
+
+       /* Store state in digest */
+       Encode(digest, context->state, 16);
+
+       /* Zeroize sensitive information. */
+       memset(context, 0, sizeof(*context));
+}
+
+/*
+ * MD4 basic transformation.  Transforms state based on block.
+ */
+static void
+MD4Transform (state, block)
+       UINT4 state[4];
+       const unsigned char block[64];
+{
+       UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
+
+       Decode(x, block, 64);
+
+       /* Round 1 */
+       FF (a, b, c, d, x[ 0], S11); /* 1 */
+       FF (d, a, b, c, x[ 1], S12); /* 2 */
+       FF (c, d, a, b, x[ 2], S13); /* 3 */
+       FF (b, c, d, a, x[ 3], S14); /* 4 */
+       FF (a, b, c, d, x[ 4], S11); /* 5 */
+       FF (d, a, b, c, x[ 5], S12); /* 6 */
+       FF (c, d, a, b, x[ 6], S13); /* 7 */
+       FF (b, c, d, a, x[ 7], S14); /* 8 */
+       FF (a, b, c, d, x[ 8], S11); /* 9 */
+       FF (d, a, b, c, x[ 9], S12); /* 10 */
+       FF (c, d, a, b, x[10], S13); /* 11 */
+       FF (b, c, d, a, x[11], S14); /* 12 */
+       FF (a, b, c, d, x[12], S11); /* 13 */
+       FF (d, a, b, c, x[13], S12); /* 14 */
+       FF (c, d, a, b, x[14], S13); /* 15 */
+       FF (b, c, d, a, x[15], S14); /* 16 */
+
+       /* Round 2 */
+       GG (a, b, c, d, x[ 0], S21); /* 17 */
+       GG (d, a, b, c, x[ 4], S22); /* 18 */
+       GG (c, d, a, b, x[ 8], S23); /* 19 */
+       GG (b, c, d, a, x[12], S24); /* 20 */
+       GG (a, b, c, d, x[ 1], S21); /* 21 */
+       GG (d, a, b, c, x[ 5], S22); /* 22 */
+       GG (c, d, a, b, x[ 9], S23); /* 23 */
+       GG (b, c, d, a, x[13], S24); /* 24 */
+       GG (a, b, c, d, x[ 2], S21); /* 25 */
+       GG (d, a, b, c, x[ 6], S22); /* 26 */
+       GG (c, d, a, b, x[10], S23); /* 27 */
+       GG (b, c, d, a, x[14], S24); /* 28 */
+       GG (a, b, c, d, x[ 3], S21); /* 29 */
+       GG (d, a, b, c, x[ 7], S22); /* 30 */
+       GG (c, d, a, b, x[11], S23); /* 31 */
+       GG (b, c, d, a, x[15], S24); /* 32 */
+
+       /* Round 3 */
+       HH (a, b, c, d, x[ 0], S31); /* 33 */
+       HH (d, a, b, c, x[ 8], S32); /* 34 */
+       HH (c, d, a, b, x[ 4], S33); /* 35 */
+       HH (b, c, d, a, x[12], S34); /* 36 */
+       HH (a, b, c, d, x[ 2], S31); /* 37 */
+       HH (d, a, b, c, x[10], S32); /* 38 */
+       HH (c, d, a, b, x[ 6], S33); /* 39 */
+       HH (b, c, d, a, x[14], S34); /* 40 */
+       HH (a, b, c, d, x[ 1], S31); /* 41 */
+       HH (d, a, b, c, x[ 9], S32); /* 42 */
+       HH (c, d, a, b, x[ 5], S33); /* 43 */
+       HH (b, c, d, a, x[13], S34); /* 44 */
+       HH (a, b, c, d, x[ 3], S31); /* 45 */
+       HH (d, a, b, c, x[11], S32); /* 46 */
+       HH (c, d, a, b, x[ 7], S33); /* 47 */
+       HH (b, c, d, a, x[15], S34); /* 48 */
+
+       state[0] += a;
+       state[1] += b;
+       state[2] += c;
+       state[3] += d;
+
+       /* Zeroize sensitive information. */
+       memset(x, 0, sizeof (x));
+}
+
+/*
+ * Encodes input (UINT4) into output (unsigned char). Assumes len is
+ * a multiple of 4.
+ */
+static void
+Encode(output, input, len)
+       unsigned char *output;
+       UINT4 *input;
+       unsigned int len;
+{
+       unsigned int i, j;
+
+       for (i = 0, j = 0; j < len; i++, j += 4) {
+               output[j] = (unsigned char)(input[i] & 0xff);
+               output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);