--- /dev/null
+/*
+ * MD4 (RFC-1320) message digest.
+ * Modified from MD5 code by Andrey Panin <pazke@donpac.ru>
+ *
+ * Written by Solar Designer <solar@openwall.com> in 2001, and placed in
+ * the public domain. There's absolutely no warranty.
+ *
+ * This differs from Colin Plumb's older public domain implementation in
+ * that no 32-bit integer data type is required, there's no compile-time
+ * endianness configuration, and the function prototypes match OpenSSL's.
+ * The primary goals are portability and ease of use.
+ *
+ * This implementation is meant to be fast, but not as fast as possible.
+ * Some known optimizations are not included to reduce source code size
+ * and avoid compile-time configuration.
+ */
+
+#include "md4.h"
+
+#include <string.h>
+
+/*
+ * The basic MD4 functions.
+ */
+#define F(x, y, z) ((z) ^ ((x) & ((y) ^ (z))))
+#define G(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z)))
+#define H(x, y, z) ((x) ^ (y) ^ (z))
+
+/*
+ * The MD4 transformation for all four rounds.
+ */
+#define STEP(f, a, b, c, d, x, s) \
+ (a) += f((b), (c), (d)) + (x); \
+ (a) = ((a) << (s)) | ((a) >> (32 - (s)))
+
+
+/*
+ * SET reads 4 input bytes in little-endian byte order and stores them
+ * in a properly aligned word in host byte order.
+ *
+ * The check for little-endian architectures which tolerate unaligned
+ * memory accesses is just an optimization. Nothing will break if it
+ * doesn't work.
+ */
+#if defined(__i386__) || defined(__x86_64__)
+#define SET(n) \
+ (*(const quint32 *)&ptr[(n) * 4])
+#define GET(n) \
+ SET(n)
+#else
+#define SET(n) \
+ (ctx->block[(n)] = \
+ (quint32)ptr[(n) * 4] | \
+ ((quint32)ptr[(n) * 4 + 1] << 8) | \
+ ((quint32)ptr[(n) * 4 + 2] << 16) | \
+ ((quint32)ptr[(n) * 4 + 3] << 24))
+#define GET(n) \
+ (ctx->block[(n)])
+#endif
+
+/*
+ * This processes one or more 64-byte data blocks, but does NOT update
+ * the bit counters. There're no alignment requirements.
+ */
+static const unsigned char *body(struct md4_context *ctx, const unsigned char *data, size_t size)
+{
+ const unsigned char *ptr;
+ quint32 a, b, c, d;
+ quint32 saved_a, saved_b, saved_c, saved_d;
+
+ ptr = data;
+
+ a = ctx->a;
+ b = ctx->b;
+ c = ctx->c;
+ d = ctx->d;
+
+ do {
+ saved_a = a;
+ saved_b = b;
+ saved_c = c;
+ saved_d = d;
+
+/* Round 1 */
+ STEP(F, a, b, c, d, SET( 0), 3);
+ STEP(F, d, a, b, c, SET( 1), 7);
+ STEP(F, c, d, a, b, SET( 2), 11);
+ STEP(F, b, c, d, a, SET( 3), 19);
+
+ STEP(F, a, b, c, d, SET( 4), 3);
+ STEP(F, d, a, b, c, SET( 5), 7);
+ STEP(F, c, d, a, b, SET( 6), 11);
+ STEP(F, b, c, d, a, SET( 7), 19);
+
+ STEP(F, a, b, c, d, SET( 8), 3);
+ STEP(F, d, a, b, c, SET( 9), 7);
+ STEP(F, c, d, a, b, SET(10), 11);
+ STEP(F, b, c, d, a, SET(11), 19);
+
+ STEP(F, a, b, c, d, SET(12), 3);
+ STEP(F, d, a, b, c, SET(13), 7);
+ STEP(F, c, d, a, b, SET(14), 11);
+ STEP(F, b, c, d, a, SET(15), 19);
+/* Round 2 */
+ STEP(G, a, b, c, d, GET( 0) + 0x5A827999, 3);
+ STEP(G, d, a, b, c, GET( 4) + 0x5A827999, 5);
+ STEP(G, c, d, a, b, GET( 8) + 0x5A827999, 9);
+ STEP(G, b, c, d, a, GET(12) + 0x5A827999, 13);
+
+ STEP(G, a, b, c, d, GET( 1) + 0x5A827999, 3);
+ STEP(G, d, a, b, c, GET( 5) + 0x5A827999, 5);
+ STEP(G, c, d, a, b, GET( 9) + 0x5A827999, 9);
+ STEP(G, b, c, d, a, GET(13) + 0x5A827999, 13);
+
+ STEP(G, a, b, c, d, GET( 2) + 0x5A827999, 3);
+ STEP(G, d, a, b, c, GET( 6) + 0x5A827999, 5);
+ STEP(G, c, d, a, b, GET(10) + 0x5A827999, 9);
+ STEP(G, b, c, d, a, GET(14) + 0x5A827999, 13);
+
+ STEP(G, a, b, c, d, GET( 3) + 0x5A827999, 3);
+ STEP(G, d, a, b, c, GET( 7) + 0x5A827999, 5);
+ STEP(G, c, d, a, b, GET(11) + 0x5A827999, 9);
+ STEP(G, b, c, d, a, GET(15) + 0x5A827999, 13);
+/* Round 3 */
+ STEP(H, a, b, c, d, GET( 0) + 0x6ED9EBA1, 3);
+ STEP(H, d, a, b, c, GET( 8) + 0x6ED9EBA1, 9);
+ STEP(H, c, d, a, b, GET( 4) + 0x6ED9EBA1, 11);
+ STEP(H, b, c, d, a, GET(12) + 0x6ED9EBA1, 15);
+
+ STEP(H, a, b, c, d, GET( 2) + 0x6ED9EBA1, 3);
+ STEP(H, d, a, b, c, GET(10) + 0x6ED9EBA1, 9);
+ STEP(H, c, d, a, b, GET( 6) + 0x6ED9EBA1, 11);
+ STEP(H, b, c, d, a, GET(14) + 0x6ED9EBA1, 15);
+
+ STEP(H, a, b, c, d, GET( 1) + 0x6ED9EBA1, 3);
+ STEP(H, d, a, b, c, GET( 9) + 0x6ED9EBA1, 9);
+ STEP(H, c, d, a, b, GET( 5) + 0x6ED9EBA1, 11);
+ STEP(H, b, c, d, a, GET(13) + 0x6ED9EBA1, 15);
+
+ STEP(H, a, b, c, d, GET( 3) + 0x6ED9EBA1, 3);
+ STEP(H, d, a, b, c, GET(11) + 0x6ED9EBA1, 9);
+ STEP(H, c, d, a, b, GET( 7) + 0x6ED9EBA1, 11);
+ STEP(H, b, c, d, a, GET(15) + 0x6ED9EBA1, 15);
+
+ a += saved_a;
+ b += saved_b;
+ c += saved_c;
+ d += saved_d;
+
+ ptr += 64;
+ } while (size -= 64);
+
+ ctx->a = a;
+ ctx->b = b;
+ ctx->c = c;
+ ctx->d = d;
+
+ return ptr;
+}
+
+static void md4_init(struct md4_context *ctx)
+{
+ ctx->a = 0x67452301;
+ ctx->b = 0xefcdab89;
+ ctx->c = 0x98badcfe;
+ ctx->d = 0x10325476;
+
+ ctx->lo = 0;
+ ctx->hi = 0;
+}
+
+static void md4_update(struct md4_context *ctx, const unsigned char *data, size_t size)
+{
+ /* @UNSAFE */
+ quint32 saved_lo;
+ unsigned long used, free;
+
+ saved_lo = ctx->lo;
+ if ((ctx->lo = (saved_lo + size) & 0x1fffffff) < saved_lo)
+ ctx->hi++;
+ ctx->hi += size >> 29;
+
+ used = saved_lo & 0x3f;
+
+ if (used) {
+ free = 64 - used;
+
+ if (size < free) {
+ memcpy(&ctx->buffer[used], data, size);
+ return;
+ }
+
+ memcpy(&ctx->buffer[used], data, free);
+ data = (const unsigned char *) data + free;
+ size -= free;
+ body(ctx, ctx->buffer, 64);
+ }
+
+ if (size >= 64) {
+ data = body(ctx, data, size & ~(unsigned long)0x3f);
+ size &= 0x3f;
+ }
+
+ memcpy(ctx->buffer, data, size);
+}
+
+static void md4_final(struct md4_context *ctx, unsigned char result[MD4_RESULTLEN])
+{
+ /* @UNSAFE */
+ unsigned long used, free;
+
+ used = ctx->lo & 0x3f;
+
+ ctx->buffer[used++] = 0x80;
+
+ free = 64 - used;
+
+ if (free < 8) {
+ memset(&ctx->buffer[used], 0, free);
+ body(ctx, ctx->buffer, 64);
+ used = 0;
+ free = 64;
+ }
+
+ memset(&ctx->buffer[used], 0, free - 8);
+
+ ctx->lo <<= 3;
+ ctx->buffer[56] = ctx->lo;
+ ctx->buffer[57] = ctx->lo >> 8;
+ ctx->buffer[58] = ctx->lo >> 16;
+ ctx->buffer[59] = ctx->lo >> 24;
+ ctx->buffer[60] = ctx->hi;
+ ctx->buffer[61] = ctx->hi >> 8;
+ ctx->buffer[62] = ctx->hi >> 16;
+ ctx->buffer[63] = ctx->hi >> 24;
+
+ body(ctx, ctx->buffer, 64);
+
+ result[0] = ctx->a;
+ result[1] = ctx->a >> 8;
+ result[2] = ctx->a >> 16;
+ result[3] = ctx->a >> 24;
+ result[4] = ctx->b;
+ result[5] = ctx->b >> 8;
+ result[6] = ctx->b >> 16;
+ result[7] = ctx->b >> 24;
+ result[8] = ctx->c;
+ result[9] = ctx->c >> 8;
+ result[10] = ctx->c >> 16;
+ result[11] = ctx->c >> 24;
+ result[12] = ctx->d;
+ result[13] = ctx->d >> 8;
+ result[14] = ctx->d >> 16;
+ result[15] = ctx->d >> 24;
+
+ memset(ctx, 0, sizeof(*ctx));
+}
+
+#undef F
+#undef G
+#undef H
projects / quassel.git / blobdiff