ref: fbdd310a2c207e0c239c1a5d69c313336e61e77b
dir: /src/libflac/md5.c/
#include <stdlib.h> /* for malloc() */
#include <string.h> /* for memcpy() */
#include "private/md5.h"
#include "share/alloc.h"
#include "share/compat.h"
#include "share/endswap.h"
/*
* This code implements the MD5 message-digest algorithm.
* The algorithm is due to Ron Rivest. This code was
* written by Colin Plumb in 1993, no copyright is claimed.
* This code is in the public domain; do with it what you wish.
*
* Equivalent code is available from RSA Data Security, Inc.
* This code has been tested against that, and is equivalent,
* except that you don't need to include two pages of legalese
* with every copy.
*
* To compute the message digest of a chunk of bytes, declare an
* MD5Context structure, pass it to MD5Init, call MD5Update as
* needed on buffers full of bytes, and then call MD5Final, which
* will fill a supplied 16-byte array with the digest.
*
* Changed so as no longer to depend on Colin Plumb's `usual.h' header
* definitions; now uses stuff from dpkg's config.h.
* - Ian Jackson <ijackson@nyx.cs.du.edu>.
* Still in the public domain.
*
* Josh Coalson: made some changes to integrate with libFLAC.
* Still in the public domain.
*/
/* The four core functions - F1 is optimized somewhat */
/* #define F1(x, y, z) (x & y | ~x & z) */
#define F1(x, y, z) (z ^ (x & (y ^ z)))
#define F2(x, y, z) F1(z, x, y)
#define F3(x, y, z) (x ^ y ^ z)
#define F4(x, y, z) (y ^ (x | ~z))
/* This is the central step in the MD5 algorithm. */
#define MD5STEP(f,w,x,y,z,in,s) \
(w += f(x,y,z) + in, w = (w<<s | w>>(32-s)) + x)
/*
* The core of the MD5 algorithm, this alters an existing MD5 hash to
* reflect the addition of 16 longwords of new data. MD5Update blocks
* the data and converts bytes into longwords for this routine.
*/
static void FLAC__MD5Transform(FLAC__uint32 buf[4], FLAC__uint32 const in[16])
{
register FLAC__uint32 a, b, c, d;
a = buf[0];
b = buf[1];
c = buf[2];
d = buf[3];
MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
buf[0] += a;
buf[1] += b;
buf[2] += c;
buf[3] += d;
}
#define byteSwap(buf, words)
#define byteSwapX16(buf)
/*
* Update context to reflect the concatenation of another buffer full
* of bytes.
*/
static void FLAC__MD5Update(FLAC__MD5Context *ctx, FLAC__byte const *buf, uint32_t len)
{
FLAC__uint32 t;
/* Update byte count */
t = ctx->bytes[0];
if ((ctx->bytes[0] = t + len) < t)
ctx->bytes[1]++; /* Carry from low to high */
t = 64 - (t & 0x3f); /* Space available in ctx->in (at least 1) */
if (t > len) {
memcpy((FLAC__byte *)ctx->in + 64 - t, buf, len);
return;
}
/* First chunk is an odd size */
memcpy((FLAC__byte *)ctx->in + 64 - t, buf, t);
byteSwapX16(ctx->in);
FLAC__MD5Transform(ctx->buf, ctx->in);
buf += t;
len -= t;
/* Process data in 64-byte chunks */
while (len >= 64) {
memcpy(ctx->in, buf, 64);
byteSwapX16(ctx->in);
FLAC__MD5Transform(ctx->buf, ctx->in);
buf += 64;
len -= 64;
}
/* Handle any remaining bytes of data. */
memcpy(ctx->in, buf, len);
}
/*
* Start MD5 accumulation. Set bit count to 0 and buffer to mysterious
* initialization constants.
*/
void FLAC__MD5Init(FLAC__MD5Context *ctx)
{
ctx->buf[0] = 0x67452301;
ctx->buf[1] = 0xefcdab89;
ctx->buf[2] = 0x98badcfe;
ctx->buf[3] = 0x10325476;
ctx->bytes[0] = 0;
ctx->bytes[1] = 0;
ctx->internal_buf.p8 = 0;
ctx->capacity = 0;
}
/*
* Final wrapup - pad to 64-byte boundary with the bit pattern
* 1 0* (64-bit count of bits processed, MSB-first)
*/
void FLAC__MD5Final(FLAC__byte digest[16], FLAC__MD5Context *ctx)
{
int count = ctx->bytes[0] & 0x3f; /* Number of bytes in ctx->in */
FLAC__byte *p = (FLAC__byte *)ctx->in + count;
/* Set the first char of padding to 0x80. There is always room. */
*p++ = 0x80;
/* Bytes of padding needed to make 56 bytes (-8..55) */
count = 56 - 1 - count;
if (count < 0) { /* Padding forces an extra block */
memset(p, 0, count + 8);
byteSwapX16(ctx->in);
FLAC__MD5Transform(ctx->buf, ctx->in);
p = (FLAC__byte *)ctx->in;
count = 56;
}
memset(p, 0, count);
byteSwap(ctx->in, 14);
/* Append length in bits and transform */
ctx->in[14] = ctx->bytes[0] << 3;
ctx->in[15] = ctx->bytes[1] << 3 | ctx->bytes[0] >> 29;
FLAC__MD5Transform(ctx->buf, ctx->in);
byteSwap(ctx->buf, 4);
memcpy(digest, ctx->buf, 16);
if (0 != ctx->internal_buf.p8) {
free(ctx->internal_buf.p8);
ctx->internal_buf.p8 = 0;
ctx->capacity = 0;
}
memset(ctx, 0, sizeof(*ctx)); /* In case it's sensitive */
}
/*
* Convert the incoming audio signal to a byte stream
*/
static void format_input_(FLAC__multibyte *mbuf, const FLAC__int32 * const signal[], uint32_t channels, uint32_t samples, uint32_t bytes_per_sample)
{
FLAC__byte *buf_ = mbuf->p8;
FLAC__int16 *buf16 = mbuf->p16;
FLAC__int32 *buf32 = mbuf->p32;
FLAC__int32 a_word;
uint32_t channel, sample;
/* Storage in the output buffer, buf, is little endian. */
#define BYTES_CHANNEL_SELECTOR(bytes, channels) (bytes * 100 + channels)
/* First do the most commonly used combinations. */
switch (BYTES_CHANNEL_SELECTOR (bytes_per_sample, channels)) {
/* One byte per sample. */
case (BYTES_CHANNEL_SELECTOR (1, 1)):
for (sample = 0; sample < samples; sample++)
*buf_++ = (FLAC__byte)signal[0][sample];
return;
case (BYTES_CHANNEL_SELECTOR (1, 2)):
for (sample = 0; sample < samples; sample++) {
*buf_++ = (FLAC__byte)signal[0][sample];
*buf_++ = (FLAC__byte)signal[1][sample];
}
return;
case (BYTES_CHANNEL_SELECTOR (1, 4)):
for (sample = 0; sample < samples; sample++) {
*buf_++ = (FLAC__byte)signal[0][sample];
*buf_++ = (FLAC__byte)signal[1][sample];
*buf_++ = (FLAC__byte)signal[2][sample];
*buf_++ = (FLAC__byte)signal[3][sample];
}
return;
case (BYTES_CHANNEL_SELECTOR (1, 6)):
for (sample = 0; sample < samples; sample++) {
*buf_++ = (FLAC__byte)signal[0][sample];
*buf_++ = (FLAC__byte)signal[1][sample];
*buf_++ = (FLAC__byte)signal[2][sample];
*buf_++ = (FLAC__byte)signal[3][sample];
*buf_++ = (FLAC__byte)signal[4][sample];
*buf_++ = (FLAC__byte)signal[5][sample];
}
return;
case (BYTES_CHANNEL_SELECTOR (1, 8)):
for (sample = 0; sample < samples; sample++) {
*buf_++ = (FLAC__byte)signal[0][sample];
*buf_++ = (FLAC__byte)signal[1][sample];
*buf_++ = (FLAC__byte)signal[2][sample];
*buf_++ = (FLAC__byte)signal[3][sample];
*buf_++ = (FLAC__byte)signal[4][sample];
*buf_++ = (FLAC__byte)signal[5][sample];
*buf_++ = (FLAC__byte)signal[6][sample];
*buf_++ = (FLAC__byte)signal[7][sample];
}
return;
/* Two bytes per sample. */
case (BYTES_CHANNEL_SELECTOR (2, 1)):
for (sample = 0; sample < samples; sample++)
*buf16++ = (FLAC__int16)H2LE_16(signal[0][sample]);
return;
case (BYTES_CHANNEL_SELECTOR (2, 2)):
for (sample = 0; sample < samples; sample++) {
*buf16++ = (FLAC__int16)H2LE_16(signal[0][sample]);
*buf16++ = (FLAC__int16)H2LE_16(signal[1][sample]);
}
return;
case (BYTES_CHANNEL_SELECTOR (2, 4)):
for (sample = 0; sample < samples; sample++) {
*buf16++ = (FLAC__int16)H2LE_16(signal[0][sample]);
*buf16++ = (FLAC__int16)H2LE_16(signal[1][sample]);
*buf16++ = (FLAC__int16)H2LE_16(signal[2][sample]);
*buf16++ = (FLAC__int16)H2LE_16(signal[3][sample]);
}
return;
case (BYTES_CHANNEL_SELECTOR (2, 6)):
for (sample = 0; sample < samples; sample++) {
*buf16++ = (FLAC__int16)H2LE_16(signal[0][sample]);
*buf16++ = (FLAC__int16)H2LE_16(signal[1][sample]);
*buf16++ = (FLAC__int16)H2LE_16(signal[2][sample]);
*buf16++ = (FLAC__int16)H2LE_16(signal[3][sample]);
*buf16++ = (FLAC__int16)H2LE_16(signal[4][sample]);
*buf16++ = (FLAC__int16)H2LE_16(signal[5][sample]);
}
return;
case (BYTES_CHANNEL_SELECTOR (2, 8)):
for (sample = 0; sample < samples; sample++) {
*buf16++ = (FLAC__int16)H2LE_16(signal[0][sample]);
*buf16++ = (FLAC__int16)H2LE_16(signal[1][sample]);
*buf16++ = (FLAC__int16)H2LE_16(signal[2][sample]);
*buf16++ = (FLAC__int16)H2LE_16(signal[3][sample]);
*buf16++ = (FLAC__int16)H2LE_16(signal[4][sample]);
*buf16++ = (FLAC__int16)H2LE_16(signal[5][sample]);
*buf16++ = (FLAC__int16)H2LE_16(signal[6][sample]);
*buf16++ = (FLAC__int16)H2LE_16(signal[7][sample]);
}
return;
/* Three bytes per sample. */
case (BYTES_CHANNEL_SELECTOR (3, 1)):
for (sample = 0; sample < samples; sample++) {
a_word = signal[0][sample];
*buf_++ = (FLAC__byte)a_word; a_word >>= 8;
*buf_++ = (FLAC__byte)a_word; a_word >>= 8;
*buf_++ = (FLAC__byte)a_word;
}
return;
case (BYTES_CHANNEL_SELECTOR (3, 2)):
for (sample = 0; sample < samples; sample++) {
a_word = signal[0][sample];
*buf_++ = (FLAC__byte)a_word; a_word >>= 8;
*buf_++ = (FLAC__byte)a_word; a_word >>= 8;
*buf_++ = (FLAC__byte)a_word;
a_word = signal[1][sample];
*buf_++ = (FLAC__byte)a_word; a_word >>= 8;
*buf_++ = (FLAC__byte)a_word; a_word >>= 8;
*buf_++ = (FLAC__byte)a_word;
}
return;
/* Four bytes per sample. */
case (BYTES_CHANNEL_SELECTOR (4, 1)):
for (sample = 0; sample < samples; sample++)
*buf32++ = H2LE_32(signal[0][sample]);
return;
case (BYTES_CHANNEL_SELECTOR (4, 2)):
for (sample = 0; sample < samples; sample++) {
*buf32++ = H2LE_32(signal[0][sample]);
*buf32++ = H2LE_32(signal[1][sample]);
}
return;
case (BYTES_CHANNEL_SELECTOR (4, 4)):
for (sample = 0; sample < samples; sample++) {
*buf32++ = H2LE_32(signal[0][sample]);
*buf32++ = H2LE_32(signal[1][sample]);
*buf32++ = H2LE_32(signal[2][sample]);
*buf32++ = H2LE_32(signal[3][sample]);
}
return;
case (BYTES_CHANNEL_SELECTOR (4, 6)):
for (sample = 0; sample < samples; sample++) {
*buf32++ = H2LE_32(signal[0][sample]);
*buf32++ = H2LE_32(signal[1][sample]);
*buf32++ = H2LE_32(signal[2][sample]);
*buf32++ = H2LE_32(signal[3][sample]);
*buf32++ = H2LE_32(signal[4][sample]);
*buf32++ = H2LE_32(signal[5][sample]);
}
return;
case (BYTES_CHANNEL_SELECTOR (4, 8)):
for (sample = 0; sample < samples; sample++) {
*buf32++ = H2LE_32(signal[0][sample]);
*buf32++ = H2LE_32(signal[1][sample]);
*buf32++ = H2LE_32(signal[2][sample]);
*buf32++ = H2LE_32(signal[3][sample]);
*buf32++ = H2LE_32(signal[4][sample]);
*buf32++ = H2LE_32(signal[5][sample]);
*buf32++ = H2LE_32(signal[6][sample]);
*buf32++ = H2LE_32(signal[7][sample]);
}
return;
default:
break;
}
/* General version. */
switch (bytes_per_sample) {
case 1:
for (sample = 0; sample < samples; sample++)
for (channel = 0; channel < channels; channel++)
*buf_++ = (FLAC__byte)signal[channel][sample];
return;
case 2:
for (sample = 0; sample < samples; sample++)
for (channel = 0; channel < channels; channel++)
*buf16++ = (FLAC__int16)H2LE_16(signal[channel][sample]);
return;
case 3:
for (sample = 0; sample < samples; sample++)
for (channel = 0; channel < channels; channel++) {
a_word = signal[channel][sample];
*buf_++ = (FLAC__byte)a_word; a_word >>= 8;
*buf_++ = (FLAC__byte)a_word; a_word >>= 8;
*buf_++ = (FLAC__byte)a_word;
}
return;
case 4:
for (sample = 0; sample < samples; sample++)
for (channel = 0; channel < channels; channel++)
*buf32++ = H2LE_32(signal[channel][sample]);
return;
default:
break;
}
}
/*
* Convert the incoming audio signal to a byte stream and FLAC__MD5Update it.
*/
FLAC__bool FLAC__MD5Accumulate(FLAC__MD5Context *ctx, const FLAC__int32 * const signal[], uint32_t channels, uint32_t samples, uint32_t bytes_per_sample)
{
const size_t bytes_needed = (size_t)channels * (size_t)samples * (size_t)bytes_per_sample;
/* overflow check */
if ((size_t)channels > SIZE_MAX / (size_t)bytes_per_sample)
return false;
if ((size_t)channels * (size_t)bytes_per_sample > SIZE_MAX / (size_t)samples)
return false;
if (ctx->capacity < bytes_needed) {
if (0 == (ctx->internal_buf.p8 = safe_realloc_(ctx->internal_buf.p8, bytes_needed))) {
if (0 == (ctx->internal_buf.p8 = safe_malloc_(bytes_needed))) {
ctx->capacity = 0;
return false;
}
}
ctx->capacity = bytes_needed;
}
format_input_(&ctx->internal_buf, signal, channels, samples, bytes_per_sample);
FLAC__MD5Update(ctx, ctx->internal_buf.p8, (uint32_t)bytes_needed);
return true;
}