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+/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
+/*
+ * lib/crypto/md4/md4.c
+ */
+
+/*
+**********************************************************************
+** md4.c **
+** RSA Data Security, Inc. MD4 Message Digest Algorithm **
+** Created: 2/17/90 RLR **
+** Revised: 1/91 SRD,AJ,BSK,JT Reference C Version **
+**********************************************************************
+*/
+
+/*
+**********************************************************************
+** Copyright (C) 1990, 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. **
+**********************************************************************
+*/
+
+#include "k5-int.h"
+#include "rsa-md4.h"
+
+/* forward declaration */
+static void Transform (krb5_ui_4 *, krb5_ui_4 *);
+
+static const unsigned char PADDING[64] = {
+ 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
+};
+
+/* F, G and H are basic MD4 functions: selection, majority, parity */
+#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)) & 0xffffffff) | ((x) >> (32-(n))))
+
+/* FF, GG and HH are MD4 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) &= 0xffffffff; \
+ (a) = ROTATE_LEFT ((a), (s));}
+#define GG(a, b, c, d, x, s) \
+ {(a) += G ((b), (c), (d)) + (x) + 013240474631UL; \
+ (a) &= 0xffffffff; \
+ (a) = ROTATE_LEFT ((a), (s));}
+#define HH(a, b, c, d, x, s) \
+ {(a) += H ((b), (c), (d)) + (x) + 015666365641UL; \
+ (a) &= 0xffffffff; \
+ (a) = ROTATE_LEFT ((a), (s));}
+
+void
+krb5int_MD4Init (krb5_MD4_CTX *mdContext)
+{
+ mdContext->i[0] = mdContext->i[1] = (krb5_ui_4)0;
+
+ /* Load magic initialization constants.
+ */
+ mdContext->buf[0] = 0x67452301UL;
+ mdContext->buf[1] = 0xefcdab89UL;
+ mdContext->buf[2] = 0x98badcfeUL;
+ mdContext->buf[3] = 0x10325476UL;
+}
+
+void
+krb5int_MD4Update (krb5_MD4_CTX *mdContext, const unsigned char *inBuf, unsigned int inLen)
+{
+ krb5_ui_4 in[16];
+ int mdi;
+ unsigned int i, ii;
+
+ /* compute number of bytes mod 64 */
+ mdi = (int)((mdContext->i[0] >> 3) & 0x3F);
+
+ /* update number of bits */
+ if ((mdContext->i[0] + ((krb5_ui_4)inLen << 3)) < mdContext->i[0])
+ mdContext->i[1]++;
+ mdContext->i[0] += ((krb5_ui_4)inLen << 3);
+ mdContext->i[1] += ((krb5_ui_4)inLen >> 29);
+
+ while (inLen--) {
+ /* add new character to buffer, increment mdi */
+ mdContext->in[mdi++] = *inBuf++;
+
+ /* transform if necessary */
+ if (mdi == 0x40) {
+ for (i = 0, ii = 0; i < 16; i++, ii += 4) {
+ in[i] = load_32_le(mdContext->in+ii);
+ }
+ Transform (mdContext->buf, in);
+ mdi = 0;
+ }
+ }
+}
+
+void
+krb5int_MD4Final (krb5_MD4_CTX *mdContext)
+{
+ krb5_ui_4 in[16];
+ int mdi;
+ unsigned int i, ii;
+ unsigned int padLen;
+
+ /* save number of bits */
+ in[14] = mdContext->i[0];
+ in[15] = mdContext->i[1];
+
+ /* compute number of bytes mod 64 */
+ mdi = (int)((mdContext->i[0] >> 3) & 0x3F);
+
+ /* pad out to 56 mod 64 */
+ padLen = (mdi < 56) ? (56 - mdi) : (120 - mdi);
+ krb5int_MD4Update (mdContext, PADDING, padLen);
+
+ /* append length in bits and transform */
+ for (i = 0, ii = 0; i < 14; i++, ii += 4)
+ in[i] = load_32_le(mdContext->in+ii);
+ Transform (mdContext->buf, in);
+
+
+ /* store buffer in digest */
+ for (i = 0, ii = 0; i < 4; i++, ii += 4) {
+ store_32_le(mdContext->buf[i], mdContext->digest+ii);
+ }
+}
+
+/* Basic MD4 step. Transform buf based on in.
+ */
+static void Transform (krb5_ui_4 *buf, krb5_ui_4 *in)
+{
+ register krb5_ui_4 a = buf[0], b = buf[1], c = buf[2], d = buf[3];
+
+#if defined(CONFIG_SMALL) && !defined(CONFIG_SMALL_NO_CRYPTO)
+ int i;
+#define ROTATE { krb5_ui_4 temp; temp = d, d = c, c = b, b = a, a = temp; }
+ for (i = 0; i < 16; i++) {
+ static const unsigned char round1consts[] = { 3, 7, 11, 19, };
+ FF (a, b, c, d, in[i], round1consts[i%4]); ROTATE;
+ }
+ for (i = 0; i < 16; i++) {
+ static const unsigned char round2indices[] = {
+ 0,4,8,12,1,5,9,13,2,6,10,14,3,7,11,15
+ };
+ static const unsigned char round2consts[] = { 3, 5, 9, 13 };
+ GG (a, b, c, d, in[round2indices[i]], round2consts[i%4]); ROTATE;
+ }
+ for (i = 0; i < 16; i++) {
+ static const unsigned char round3indices[] = {
+ 0, 8, 4, 12, 2, 10, 6, 14, 1, 9, 5, 13, 3, 11, 7, 15
+ };
+ static const unsigned char round3consts[] = { 3, 9, 11, 15 };
+ HH (a, b, c, d, in[round3indices[i]], round3consts[i%4]); ROTATE;
+ }
+#else
+ /* Round 1 */
+ FF (a, b, c, d, in[ 0], 3);
+ FF (d, a, b, c, in[ 1], 7);
+ FF (c, d, a, b, in[ 2], 11);
+ FF (b, c, d, a, in[ 3], 19);
+ FF (a, b, c, d, in[ 4], 3);
+ FF (d, a, b, c, in[ 5], 7);
+ FF (c, d, a, b, in[ 6], 11);
+ FF (b, c, d, a, in[ 7], 19);
+ FF (a, b, c, d, in[ 8], 3);
+ FF (d, a, b, c, in[ 9], 7);
+ FF (c, d, a, b, in[10], 11);
+ FF (b, c, d, a, in[11], 19);
+ FF (a, b, c, d, in[12], 3);
+ FF (d, a, b, c, in[13], 7);
+ FF (c, d, a, b, in[14], 11);
+ FF (b, c, d, a, in[15], 19);
+
+ /* Round 2 */
+ GG (a, b, c, d, in[ 0], 3);
+ GG (d, a, b, c, in[ 4], 5);
+ GG (c, d, a, b, in[ 8], 9);
+ GG (b, c, d, a, in[12], 13);
+ GG (a, b, c, d, in[ 1], 3);
+ GG (d, a, b, c, in[ 5], 5);
+ GG (c, d, a, b, in[ 9], 9);
+ GG (b, c, d, a, in[13], 13);
+ GG (a, b, c, d, in[ 2], 3);
+ GG (d, a, b, c, in[ 6], 5);
+ GG (c, d, a, b, in[10], 9);
+ GG (b, c, d, a, in[14], 13);
+ GG (a, b, c, d, in[ 3], 3);
+ GG (d, a, b, c, in[ 7], 5);
+ GG (c, d, a, b, in[11], 9);
+ GG (b, c, d, a, in[15], 13);
+
+ /* Round 3 */
+ HH (a, b, c, d, in[ 0], 3);
+ HH (d, a, b, c, in[ 8], 9);
+ HH (c, d, a, b, in[ 4], 11);
+ HH (b, c, d, a, in[12], 15);
+ HH (a, b, c, d, in[ 2], 3);
+ HH (d, a, b, c, in[10], 9);
+ HH (c, d, a, b, in[ 6], 11);
+ HH (b, c, d, a, in[14], 15);
+ HH (a, b, c, d, in[ 1], 3);
+ HH (d, a, b, c, in[ 9], 9);
+ HH (c, d, a, b, in[ 5], 11);
+ HH (b, c, d, a, in[13], 15);
+ HH (a, b, c, d, in[ 3], 3);
+ HH (d, a, b, c, in[11], 9);
+ HH (c, d, a, b, in[ 7], 11);
+ HH (b, c, d, a, in[15], 15);
+#endif
+
+ buf[0] += a;
+ buf[1] += b;
+ buf[2] += c;
+ buf[3] += d;
+}
+
+/*
+**********************************************************************
+** End of md4.c **
+******************************* (cut) ********************************
+*/
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