/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2000-2009. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* %CopyrightEnd%
*/
package com.ericsson.otp.erlang;
// package scope
class OtpMD5 {
/*
* * MD5 constants
*/
static final long S11 = 7;
static final long S12 = 12;
static final long S13 = 17;
static final long S14 = 22;
static final long S21 = 5;
static final long S22 = 9;
static final long S23 = 14;
static final long S24 = 20;
static final long S31 = 4;
static final long S32 = 11;
static final long S33 = 16;
static final long S34 = 23;
static final long S41 = 6;
static final long S42 = 10;
static final long S43 = 15;
static final long S44 = 21;
/*
* Has to be this large to avoid sign problems
*/
private final long state[] = { 0x67452301L, 0xefcdab89L, 0x98badcfeL, 0x10325476L };
private final long count[] = { 0L, 0L };
private final int buffer[];
public OtpMD5() {
buffer = new int[64];
int i;
for (i = 0; i < 64; ++i) {
buffer[i] = 0;
}
}
private int[] to_bytes(final String s) {
final char tmp[] = s.toCharArray();
final int ret[] = new int[tmp.length];
int i;
for (i = 0; i < tmp.length; ++i) {
ret[i] = tmp[i] & 0xFF;
}
return ret;
}
private int[] clean_bytes(final int bytes[]) {
final int ret[] = new int[bytes.length];
int i;
for (i = 0; i < bytes.length; ++i) {
ret[i] = bytes[i] & 0xFF;
}
return ret;
}
/*
* * A couple of operations where 32 bit over/under-flow is expected
*/
private long shl(final long what, final int steps) {
return what << steps & 0xFFFFFFFFL;
}
private long shr(final long what, final int steps) {
return what >>> steps;
}
private long plus(final long a, final long b) {
return a + b & 0xFFFFFFFFL;
}
private long not(final long x) {
return ~x & 0xFFFFFFFFL;
}
private void to_buffer(final int to_start, final int[] from, final int from_start,
final int num) {
int ix = num;
int to_ix = to_start;
int from_ix = from_start;
while (ix-- > 0) {
buffer[to_ix++] = from[from_ix++];
}
}
private void do_update(final int bytes[]) {
int index = (int) (count[0] >>> 3 & 0x3F);
final long inlen = bytes.length;
final long addcount = shl(inlen, 3);
final long partlen = 64 - index;
int i;
count[0] = plus(count[0], addcount);
if (count[0] < addcount) {
++count[1];
}
count[1] = plus(count[1], shr(inlen, 29));
// dumpstate();
if (inlen >= partlen) {
to_buffer(index, bytes, 0, (int) partlen);
transform(buffer, 0);
for (i = (int) partlen; i + 63 < inlen; i += 64) {
transform(bytes, i);
}
index = 0;
} else {
i = 0;
}
/* dumpstate(); */
to_buffer(index, bytes, i, (int) inlen - i);
/* dumpstate(); */
}
@SuppressWarnings("unused")
private void dumpstate() {
System.out.println("state = {" + state[0] + ", " + state[1] + ", " + state[2]
+ ", " + state[3] + "}");
System.out.println("count = {" + count[0] + ", " + count[1] + "}");
System.out.print("buffer = {");
int i;
for (i = 0; i < 64; ++i) {
if (i > 0) {
System.out.print(", ");
}
System.out.print(buffer[i]);
}
System.out.println("}");
}
/*
* * The transformation functions
*/
private long F(final long x, final long y, final long z) {
return x & y | not(x) & z;
}
private long G(final long x, final long y, final long z) {
return x & z | y & not(z);
}
private long H(final long x, final long y, final long z) {
return x ^ y ^ z;
}
private long I(final long x, final long y, final long z) {
return y ^ (x | not(z));
}
private long ROTATE_LEFT(final long x, final long n) {
return shl(x, (int) n) | shr(x, (int) (32 - n));
}
private long FF(final long a, final long b, final long c, final long d, final long x,
final long s, final long ac) {
long tmp = plus(a, plus(plus(F(b, c, d), x), ac));
tmp = ROTATE_LEFT(tmp, s);
return plus(tmp, b);
}
private long GG(final long a, final long b, final long c, final long d, final long x,
final long s, final long ac) {
long tmp = plus(a, plus(plus(G(b, c, d), x), ac));
tmp = ROTATE_LEFT(tmp, s);
return plus(tmp, b);
}
private long HH(final long a, final long b, final long c, final long d, final long x,
final long s, final long ac) {
long tmp = plus(a, plus(plus(H(b, c, d), x), ac));
tmp = ROTATE_LEFT(tmp, s);
return plus(tmp, b);
}
private long II(final long a, final long b, final long c, final long d, final long x,
final long s, final long ac) {
long tmp = plus(a, plus(plus(I(b, c, d), x), ac));
tmp = ROTATE_LEFT(tmp, s);
return plus(tmp, b);
}
private void decode(final long output[], final int input[], final int in_from,
final int len) {
int i, j;
for (i = 0, j = 0; j < len; i++, j += 4) {
output[i] = input[j + in_from] | shl(input[j + in_from + 1], 8)
| shl(input[j + in_from + 2], 16) | shl(input[j + in_from + 3], 24);
}
}
private void transform(final int block[], final int from) {
long a = state[0];
long b = state[1];
long c = state[2];
long d = state[3];
final long x[] = new long[16];
decode(x, block, from, 64);
a = FF(a, b, c, d, x[0], S11, 0xd76aa478L); /* 1 */
d = FF(d, a, b, c, x[1], S12, 0xe8c7b756L); /* 2 */
c = FF(c, d, a, b, x[2], S13, 0x242070dbL); /* 3 */
b = FF(b, c, d, a, x[3], S14, 0xc1bdceeeL); /* 4 */
a = FF(a, b, c, d, x[4], S11, 0xf57c0fafL); /* 5 */
d = FF(d, a, b, c, x[5], S12, 0x4787c62aL); /* 6 */
c = FF(c, d, a, b, x[6], S13, 0xa8304613L); /* 7 */
b = FF(b, c, d, a, x[7], S14, 0xfd469501L); /* 8 */
a = FF(a, b, c, d, x[8], S11, 0x698098d8L); /* 9 */
d = FF(d, a, b, c, x[9], S12, 0x8b44f7afL); /* 10 */
c = FF(c, d, a, b, x[10], S13, 0xffff5bb1L); /* 11 */
b = FF(b, c, d, a, x[11], S14, 0x895cd7beL); /* 12 */
a = FF(a, b, c, d, x[12], S11, 0x6b901122L); /* 13 */
d = FF(d, a, b, c, x[13], S12, 0xfd987193L); /* 14 */
c = FF(c, d, a, b, x[14], S13, 0xa679438eL); /* 15 */
b = FF(b, c, d, a, x[15], S14, 0x49b40821L); /* 16 */
/* Round 2 */
a = GG(a, b, c, d, x[1], S21, 0xf61e2562L); /* 17 */
d = GG(d, a, b, c, x[6], S22, 0xc040b340L); /* 18 */
c = GG(c, d, a, b, x[11], S23, 0x265e5a51L); /* 19 */
b = GG(b, c, d, a, x[0], S24, 0xe9b6c7aaL); /* 20 */
a = GG(a, b, c, d, x[5], S21, 0xd62f105dL); /* 21 */
d = GG(d, a, b, c, x[10], S22, 0x2441453L); /* 22 */
c = GG(c, d, a, b, x[15], S23, 0xd8a1e681L); /* 23 */
b = GG(b, c, d, a, x[4], S24, 0xe7d3fbc8L); /* 24 */
a = GG(a, b, c, d, x[9], S21, 0x21e1cde6L); /* 25 */
d = GG(d, a, b, c, x[14], S22, 0xc33707d6L); /* 26 */
c = GG(c, d, a, b, x[3], S23, 0xf4d50d87L); /* 27 */
b = GG(b, c, d, a, x[8], S24, 0x455a14edL); /* 28 */
a = GG(a, b, c, d, x[13], S21, 0xa9e3e905L); /* 29 */
d = GG(d, a, b, c, x[2], S22, 0xfcefa3f8L); /* 30 */
c = GG(c, d, a, b, x[7], S23, 0x676f02d9L); /* 31 */
b = GG(b, c, d, a, x[12], S24, 0x8d2a4c8aL); /* 32 */
/* Round 3 */
a = HH(a, b, c, d, x[5], S31, 0xfffa3942L); /* 33 */
d = HH(d, a, b, c, x[8], S32, 0x8771f681L); /* 34 */
c = HH(c, d, a, b, x[11], S33, 0x6d9d6122L); /* 35 */
b = HH(b, c, d, a, x[14], S34, 0xfde5380cL); /* 36 */
a = HH(a, b, c, d, x[1], S31, 0xa4beea44L); /* 37 */
d = HH(d, a, b, c, x[4], S32, 0x4bdecfa9L); /* 38 */
c = HH(c, d, a, b, x[7], S33, 0xf6bb4b60L); /* 39 */
b = HH(b, c, d, a, x[10], S34, 0xbebfbc70L); /* 40 */
a = HH(a, b, c, d, x[13], S31, 0x289b7ec6L); /* 41 */
d = HH(d, a, b, c, x[0], S32, 0xeaa127faL); /* 42 */
c = HH(c, d, a, b, x[3], S33, 0xd4ef3085L); /* 43 */
b = HH(b, c, d, a, x[6], S34, 0x4881d05L); /* 44 */
a = HH(a, b, c, d, x[9], S31, 0xd9d4d039L); /* 45 */
d = HH(d, a, b, c, x[12], S32, 0xe6db99e5L); /* 46 */
c = HH(c, d, a, b, x[15], S33, 0x1fa27cf8L); /* 47 */
b = HH(b, c, d, a, x[2], S34, 0xc4ac5665L); /* 48 */
/* Round 4 */
a = II(a, b, c, d, x[0], S41, 0xf4292244L); /* 49 */
d = II(d, a, b, c, x[7], S42, 0x432aff97L); /* 50 */
c = II(c, d, a, b, x[14], S43, 0xab9423a7L); /* 51 */
b = II(b, c, d, a, x[5], S44, 0xfc93a039L); /* 52 */
a = II(a, b, c, d, x[12], S41, 0x655b59c3L); /* 53 */
d = II(d, a, b, c, x[3], S42, 0x8f0ccc92L); /* 54 */
c = II(c, d, a, b, x[10], S43, 0xffeff47dL); /* 55 */
b = II(b, c, d, a, x[1], S44, 0x85845dd1L); /* 56 */
a = II(a, b, c, d, x[8], S41, 0x6fa87e4fL); /* 57 */
d = II(d, a, b, c, x[15], S42, 0xfe2ce6e0L); /* 58 */
c = II(c, d, a, b, x[6], S43, 0xa3014314L); /* 59 */
b = II(b, c, d, a, x[13], S44, 0x4e0811a1L); /* 60 */
a = II(a, b, c, d, x[4], S41, 0xf7537e82L); /* 61 */
d = II(d, a, b, c, x[11], S42, 0xbd3af235L); /* 62 */
c = II(c, d, a, b, x[2], S43, 0x2ad7d2bbL); /* 63 */
b = II(b, c, d, a, x[9], S44, 0xeb86d391L); /* 64 */
state[0] = plus(state[0], a);
state[1] = plus(state[1], b);
state[2] = plus(state[2], c);
state[3] = plus(state[3], d);
}
public void update(final int bytes[]) {
do_update(clean_bytes(bytes));
}
public void update(final String s) {
do_update(to_bytes(s));
}
private int[] encode(final long[] input, final int len) {
final int output[] = new int[len];
int i, j;
for (i = 0, j = 0; j < len; i++, j += 4) {
output[j] = (int) (input[i] & 0xff);
output[j + 1] = (int) (input[i] >>> 8 & 0xff);
output[j + 2] = (int) (input[i] >>> 16 & 0xff);
output[j + 3] = (int) (input[i] >>> 24 & 0xff);
}
return output;
}
public int[] final_bytes() {
final int bits[] = encode(count, 8);
int index, padlen;
int padding[], i;
int[] digest;
index = (int) (count[0] >>> 3 & 0x3f);
padlen = index < 56 ? 56 - index : 120 - index;
/* padlen > 0 */
padding = new int[padlen];
padding[0] = 0x80;
for (i = 1; i < padlen; ++i) {
padding[i] = 0;
}
do_update(padding);
do_update(bits);
digest = encode(state, 16);
return digest;
}
}