#include "k5-int.h"
#include "rsa-md5.h"
static void Transform (krb5_ui_4 *buf, krb5_ui_4 *in);
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) & (z)) | ((y) & (~z)))
#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))
#define ROTATE_LEFT(x, n) ((((x) << (n)) & 0xffffffff) | ((x) >> (32-(n))))
#define FF(a, b, c, d, x, s, ac) \
{(a) += F ((b), (c), (d)) + (x) + (krb5_ui_4)(ac); \
(a) &= 0xffffffff; \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
(a) &= 0xffffffff; \
}
#define GG(a, b, c, d, x, s, ac) \
{(a) += G ((b), (c), (d)) + (x) + (krb5_ui_4)(ac); \
(a) &= 0xffffffff; \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
(a) &= 0xffffffff; \
}
#define HH(a, b, c, d, x, s, ac) \
{(a) += H ((b), (c), (d)) + (x) + (krb5_ui_4)(ac); \
(a) &= 0xffffffff; \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
(a) &= 0xffffffff; \
}
#define II(a, b, c, d, x, s, ac) \
{(a) += I ((b), (c), (d)) + (x) + (krb5_ui_4)(ac); \
(a) &= 0xffffffff; \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
(a) &= 0xffffffff; \
}
void
krb5_MD5Init (mdContext)
krb5_MD5_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_MD5Update (mdContext, inBuf, inLen)
krb5_MD5_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_MD5Final (mdContext)
krb5_MD5_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_MD5Update (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 (buf, in)
krb5_ui_4 *buf;
krb5_ui_4 *in;
{
register krb5_ui_4 a = buf[0], b = buf[1], c = buf[2], d = buf[3];
#define S11 7
#define S12 12
#define S13 17
#define S14 22
FF ( a, b, c, d, in[ 0], S11, 3614090360UL);
FF ( d, a, b, c, in[ 1], S12, 3905402710UL);
FF ( c, d, a, b, in[ 2], S13, 606105819UL);
FF ( b, c, d, a, in[ 3], S14, 3250441966UL);
FF ( a, b, c, d, in[ 4], S11, 4118548399UL);
FF ( d, a, b, c, in[ 5], S12, 1200080426UL);
FF ( c, d, a, b, in[ 6], S13, 2821735955UL);
FF ( b, c, d, a, in[ 7], S14, 4249261313UL);
FF ( a, b, c, d, in[ 8], S11, 1770035416UL);
FF ( d, a, b, c, in[ 9], S12, 2336552879UL);
FF ( c, d, a, b, in[10], S13, 4294925233UL);
FF ( b, c, d, a, in[11], S14, 2304563134UL);
FF ( a, b, c, d, in[12], S11, 1804603682UL);
FF ( d, a, b, c, in[13], S12, 4254626195UL);
FF ( c, d, a, b, in[14], S13, 2792965006UL);
FF ( b, c, d, a, in[15], S14, 1236535329UL);
#define S21 5
#define S22 9
#define S23 14
#define S24 20
GG ( a, b, c, d, in[ 1], S21, 4129170786UL);
GG ( d, a, b, c, in[ 6], S22, 3225465664UL);
GG ( c, d, a, b, in[11], S23, 643717713UL);
GG ( b, c, d, a, in[ 0], S24, 3921069994UL);
GG ( a, b, c, d, in[ 5], S21, 3593408605UL);
GG ( d, a, b, c, in[10], S22, 38016083UL);
GG ( c, d, a, b, in[15], S23, 3634488961UL);
GG ( b, c, d, a, in[ 4], S24, 3889429448UL);
GG ( a, b, c, d, in[ 9], S21, 568446438UL);
GG ( d, a, b, c, in[14], S22, 3275163606UL);
GG ( c, d, a, b, in[ 3], S23, 4107603335UL);
GG ( b, c, d, a, in[ 8], S24, 1163531501UL);
GG ( a, b, c, d, in[13], S21, 2850285829UL);
GG ( d, a, b, c, in[ 2], S22, 4243563512UL);
GG ( c, d, a, b, in[ 7], S23, 1735328473UL);
GG ( b, c, d, a, in[12], S24, 2368359562UL);
#define S31 4
#define S32 11
#define S33 16
#define S34 23
HH ( a, b, c, d, in[ 5], S31, 4294588738UL);
HH ( d, a, b, c, in[ 8], S32, 2272392833UL);
HH ( c, d, a, b, in[11], S33, 1839030562UL);
HH ( b, c, d, a, in[14], S34, 4259657740UL);
HH ( a, b, c, d, in[ 1], S31, 2763975236UL);
HH ( d, a, b, c, in[ 4], S32, 1272893353UL);
HH ( c, d, a, b, in[ 7], S33, 4139469664UL);
HH ( b, c, d, a, in[10], S34, 3200236656UL);
HH ( a, b, c, d, in[13], S31, 681279174UL);
HH ( d, a, b, c, in[ 0], S32, 3936430074UL);
HH ( c, d, a, b, in[ 3], S33, 3572445317UL);
HH ( b, c, d, a, in[ 6], S34, 76029189UL);
HH ( a, b, c, d, in[ 9], S31, 3654602809UL);
HH ( d, a, b, c, in[12], S32, 3873151461UL);
HH ( c, d, a, b, in[15], S33, 530742520UL);
HH ( b, c, d, a, in[ 2], S34, 3299628645UL);
#define S41 6
#define S42 10
#define S43 15
#define S44 21
II ( a, b, c, d, in[ 0], S41, 4096336452UL);
II ( d, a, b, c, in[ 7], S42, 1126891415UL);
II ( c, d, a, b, in[14], S43, 2878612391UL);
II ( b, c, d, a, in[ 5], S44, 4237533241UL);
II ( a, b, c, d, in[12], S41, 1700485571UL);
II ( d, a, b, c, in[ 3], S42, 2399980690UL);
II ( c, d, a, b, in[10], S43, 4293915773UL);
II ( b, c, d, a, in[ 1], S44, 2240044497UL);
II ( a, b, c, d, in[ 8], S41, 1873313359UL);
II ( d, a, b, c, in[15], S42, 4264355552UL);
II ( c, d, a, b, in[ 6], S43, 2734768916UL);
II ( b, c, d, a, in[13], S44, 1309151649UL);
II ( a, b, c, d, in[ 4], S41, 4149444226UL);
II ( d, a, b, c, in[11], S42, 3174756917UL);
II ( c, d, a, b, in[ 2], S43, 718787259UL);
II ( b, c, d, a, in[ 9], S44, 3951481745UL);
buf[0] += a;
buf[1] += b;
buf[2] += c;
buf[3] += d;
}