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238 lines
7.8 KiB
238 lines
7.8 KiB
#include "xmpmeta/md5.h"
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#include <string.h> // for memcpy().
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#include <vector>
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#include "base/integral_types.h"
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#include "strings/escaping.h"
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namespace dynamic_depth {
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namespace xmpmeta {
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namespace {
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const int kMd5DigestSize = 16;
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typedef struct MD5Context MD5_CTX;
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struct MD5Context {
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uint32 buf[4];
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uint32 bits[2];
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uint32 in[16];
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};
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void MD5Init(struct MD5Context* context);
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void MD5Update(struct MD5Context* context, const uint8* data, size_t len);
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void MD5Final(unsigned char digest[16], struct MD5Context* ctx);
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void MD5Transform(uint32 buf[4], const uint32 in[16]);
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// Start MD5 accumulation. Set bit count to 0 and buffer to mysterious
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// initialization constants.
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void MD5Init(MD5Context* context) {
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context->buf[0] = 0x67452301;
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context->buf[1] = 0xefcdab89;
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context->buf[2] = 0x98badcfe;
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context->buf[3] = 0x10325476;
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context->bits[0] = 0;
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context->bits[1] = 0;
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}
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// Update context to reflect the concatenation of another buffer full of bytes.
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void MD5Update(MD5Context* context, const uint8* data, size_t len) {
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// Update bitcount.
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uint32 t = context->bits[0];
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if ((context->bits[0] = t + (static_cast<uint32>(len) << 3)) < t) {
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context->bits[1]++; // Carry from low to high.
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}
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context->bits[1] += len >> 29;
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t = (t >> 3) & 0x3f; // Bytes already in shsInfo->data.
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// Handle any leading odd-sized chunks.
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if (t) {
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uint8* p = reinterpret_cast<uint8*>(context->in) + t;
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t = 64 - t;
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if (len < t) {
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memcpy(p, data, len);
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return;
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}
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memcpy(p, data, t);
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MD5Transform(context->buf, context->in);
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data += t;
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len -= t;
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}
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// Process data in 64-byte chunks.
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while (len >= 64) {
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memcpy(context->in, data, 64);
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MD5Transform(context->buf, context->in);
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data += 64;
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len -= 64;
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}
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// Handle any remaining bytes of data.
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memcpy(context->in, data, len);
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}
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// Final wrapup - pad to 64-byte boundary with the bit pattern.
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// 1 0* (64-bit count of bits processed, MSB-first)
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void MD5Final(uint8 digest[16], MD5Context* ctx) {
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// Compute number of bytes mod 64.
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uint32 count = (ctx->bits[0] >> 3) & 0x3F;
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// Set the first char of padding to 0x80. This is safe since there is
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// always at least one byte free.
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uint8* p = reinterpret_cast<uint8*>(ctx->in) + count;
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*p++ = 0x80;
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// Bytes of padding needed to make 64 bytes.
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count = 64 - 1 - count;
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// Pad out to 56 mod 64.
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if (count < 8) {
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// Two lots of padding: Pad the first block to 64 bytes.
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memset(p, 0, count);
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MD5Transform(ctx->buf, ctx->in);
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// Now fill the next block with 56 bytes.
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memset(ctx->in, 0, 56);
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} else {
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// Pad block to 56 bytes.
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memset(p, 0, count - 8);
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}
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// Append length in bits and transform.
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ctx->in[14] = ctx->bits[0];
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ctx->in[15] = ctx->bits[1];
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MD5Transform(ctx->buf, ctx->in);
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memcpy(digest, ctx->buf, 16);
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memset(ctx, 0, sizeof(*ctx)); // In case it's sensitive.
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}
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// The four core functions - F1 is optimized somewhat.
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// #define F1(x, y, z) (x & y | ~x & z)
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#define F1(x, y, z) (z ^ (x & (y ^ z)))
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#define F2(x, y, z) F1(z, x, y)
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#define F3(x, y, z) (x ^ y ^ z)
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#define F4(x, y, z) (y ^ (x | ~z))
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// This is the central step in the MD5 algorithm.
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#define MD5STEP(f, w, x, y, z, data, s) \
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(w += f(x, y, z) + data, w = w << s | w >> (32 - s), w += x)
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#if defined(__clang__) && defined(__has_attribute)
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#if __has_attribute(no_sanitize)
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#define DDEPTH_NO_UNSIGNED_OVERFLOW_CHECK \
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__attribute__((no_sanitize("unsigned-integer-overflow")))
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#endif
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#endif
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#ifndef DDEPTH_NO_UNSIGNED_OVERFLOW_CHECK
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#define DDEPTH_NO_UNSIGNED_OVERFLOW_CHECK
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#endif
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// The core of the MD5 algorithm, this alters an existing MD5 hash to
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// reflect the addition of 16 longwords of new data. MD5Update blocks
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// the data and converts bytes into longwords for this routine.
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DDEPTH_NO_UNSIGNED_OVERFLOW_CHECK void MD5Transform(uint32 buf[4],
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const uint32 in[16]) {
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uint32 a = buf[0];
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uint32 b = buf[1];
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uint32 c = buf[2];
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uint32 d = buf[3];
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MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
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MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
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MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
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MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
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MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
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MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
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MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
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MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
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MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
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MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
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MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
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MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
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MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
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MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
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MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
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MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
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MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
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MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
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MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
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MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
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MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
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MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
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MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
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MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
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MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
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MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
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MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
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MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
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MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
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MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
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MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
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MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
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MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
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MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
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MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
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MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
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MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
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MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
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MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
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MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
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MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
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MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
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MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
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MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
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MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
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MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
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MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
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MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
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MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
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MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
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MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
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MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
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MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
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MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
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MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
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MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
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MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
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MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
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MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
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MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
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MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
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MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
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MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
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MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
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buf[0] += a;
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buf[1] += b;
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buf[2] += c;
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buf[3] += d;
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}
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void MD5(const uint8_t* to_hash, size_t to_hash_length, uint8_t* output) {
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MD5Context md5_context;
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MD5Init(&md5_context);
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MD5Update(&md5_context, to_hash, to_hash_length);
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MD5Final(output, &md5_context);
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}
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} // namespace
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string MD5Hash(const string& to_hash) {
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std::vector<uint8_t> buffer;
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buffer.resize(kMd5DigestSize);
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MD5(reinterpret_cast<const uint8_t*>(to_hash.data()), to_hash.length(),
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&buffer[0]);
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return dynamic_depth::b2a_hex(reinterpret_cast<const char*>(&buffer[0]),
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kMd5DigestSize);
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}
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} // namespace xmpmeta
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} // namespace dynamic_depth
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