#include "k5-int.h"
#include "rsa-md4.h"
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
};
#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))
#define ROTATE_LEFT(x, n) ((((x) << (n)) & 0xffffffff) | ((x) >> (32-(n))))
#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
krb5_MD4Init (krb5_MD4_CTX *mdContext)
{
mdContext->i[0] = mdContext->i[1] = (krb5_ui_4)0;
mdContext->buf[0] = 0x67452301UL;
mdContext->buf[1] = 0xefcdab89UL;
mdContext->buf[2] = 0x98badcfeUL;
mdContext->buf[3] = 0x10325476UL;
}
void
krb5_MD4Update (krb5_MD4_CTX *mdContext, const unsigned char *inBuf, unsigned int inLen)
{
krb5_ui_4 in[16];
int mdi;
unsigned int i, ii;
mdi = (int)((mdContext->i[0] >> 3) & 0x3F);
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--) {
mdContext->in[mdi++] = *inBuf++;
if (mdi == 0x40) {
for (i = 0, ii = 0; i < 16; i++, ii += 4)
in[i] = (((krb5_ui_4)mdContext->in[ii+3]) << 24) |
(((krb5_ui_4)mdContext->in[ii+2]) << 16) |
(((krb5_ui_4)mdContext->in[ii+1]) << 8) |
((krb5_ui_4)mdContext->in[ii]);
Transform (mdContext->buf, in);
mdi = 0;
}
}
}
void
krb5_MD4Final (krb5_MD4_CTX *mdContext)
{
krb5_ui_4 in[16];
int mdi;
unsigned int i, ii;
unsigned int padLen;
in[14] = mdContext->i[0];
in[15] = mdContext->i[1];
mdi = (int)((mdContext->i[0] >> 3) & 0x3F);
padLen = (mdi < 56) ? (56 - mdi) : (120 - mdi);
krb5_MD4Update (mdContext, PADDING, padLen);
for (i = 0, ii = 0; i < 14; i++, ii += 4)
in[i] = (((krb5_ui_4)mdContext->in[ii+3]) << 24) |
(((krb5_ui_4)mdContext->in[ii+2]) << 16) |
(((krb5_ui_4)mdContext->in[ii+1]) << 8) |
((krb5_ui_4)mdContext->in[ii]);
Transform (mdContext->buf, in);
for (i = 0, ii = 0; i < 4; i++, ii += 4) {
mdContext->digest[ii] = (unsigned char)(mdContext->buf[i] & 0xFF);
mdContext->digest[ii+1] =
(unsigned char)((mdContext->buf[i] >> 8) & 0xFF);
mdContext->digest[ii+2] =
(unsigned char)((mdContext->buf[i] >> 16) & 0xFF);
mdContext->digest[ii+3] =
(unsigned char)((mdContext->buf[i] >> 24) & 0xFF);
}
}
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];
#ifdef CONFIG_SMALL
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
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);
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);
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;
}