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// Copyright 2014 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
#include "core/fdrm/fx_crypt.h"
#include <utility>
#define GET_UINT32(n, b, i) \
{ \
(n) = (uint32_t)((uint8_t*)b)[(i)] | \
(((uint32_t)((uint8_t*)b)[(i) + 1]) << 8) | \
(((uint32_t)((uint8_t*)b)[(i) + 2]) << 16) | \
(((uint32_t)((uint8_t*)b)[(i) + 3]) << 24); \
}
#define PUT_UINT32(n, b, i) \
{ \
(((uint8_t*)b)[(i)]) = (uint8_t)(((n)) & 0xFF); \
(((uint8_t*)b)[(i) + 1]) = (uint8_t)(((n) >> 8) & 0xFF); \
(((uint8_t*)b)[(i) + 2]) = (uint8_t)(((n) >> 16) & 0xFF); \
(((uint8_t*)b)[(i) + 3]) = (uint8_t)(((n) >> 24) & 0xFF); \
}
namespace {
const uint8_t md5_padding[64] = {
0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
void md5_process(CRYPT_md5_context* ctx, const uint8_t data[64]) {
uint32_t A, B, C, D, X[16];
GET_UINT32(X[0], data, 0);
GET_UINT32(X[1], data, 4);
GET_UINT32(X[2], data, 8);
GET_UINT32(X[3], data, 12);
GET_UINT32(X[4], data, 16);
GET_UINT32(X[5], data, 20);
GET_UINT32(X[6], data, 24);
GET_UINT32(X[7], data, 28);
GET_UINT32(X[8], data, 32);
GET_UINT32(X[9], data, 36);
GET_UINT32(X[10], data, 40);
GET_UINT32(X[11], data, 44);
GET_UINT32(X[12], data, 48);
GET_UINT32(X[13], data, 52);
GET_UINT32(X[14], data, 56);
GET_UINT32(X[15], data, 60);
#define S(x, n) ((x << n) | ((x & 0xFFFFFFFF) >> (32 - n)))
#define P(a, b, c, d, k, s, t) \
{ \
a += F(b, c, d) + X[k] + t; \
a = S(a, s) + b; \
}
A = ctx->state[0];
B = ctx->state[1];
C = ctx->state[2];
D = ctx->state[3];
#define F(x, y, z) (z ^ (x & (y ^ z)))
P(A, B, C, D, 0, 7, 0xD76AA478);
P(D, A, B, C, 1, 12, 0xE8C7B756);
P(C, D, A, B, 2, 17, 0x242070DB);
P(B, C, D, A, 3, 22, 0xC1BDCEEE);
P(A, B, C, D, 4, 7, 0xF57C0FAF);
P(D, A, B, C, 5, 12, 0x4787C62A);
P(C, D, A, B, 6, 17, 0xA8304613);
P(B, C, D, A, 7, 22, 0xFD469501);
P(A, B, C, D, 8, 7, 0x698098D8);
P(D, A, B, C, 9, 12, 0x8B44F7AF);
P(C, D, A, B, 10, 17, 0xFFFF5BB1);
P(B, C, D, A, 11, 22, 0x895CD7BE);
P(A, B, C, D, 12, 7, 0x6B901122);
P(D, A, B, C, 13, 12, 0xFD987193);
P(C, D, A, B, 14, 17, 0xA679438E);
P(B, C, D, A, 15, 22, 0x49B40821);
#undef F
#define F(x, y, z) (y ^ (z & (x ^ y)))
P(A, B, C, D, 1, 5, 0xF61E2562);
P(D, A, B, C, 6, 9, 0xC040B340);
P(C, D, A, B, 11, 14, 0x265E5A51);
P(B, C, D, A, 0, 20, 0xE9B6C7AA);
P(A, B, C, D, 5, 5, 0xD62F105D);
P(D, A, B, C, 10, 9, 0x02441453);
P(C, D, A, B, 15, 14, 0xD8A1E681);
P(B, C, D, A, 4, 20, 0xE7D3FBC8);
P(A, B, C, D, 9, 5, 0x21E1CDE6);
P(D, A, B, C, 14, 9, 0xC33707D6);
P(C, D, A, B, 3, 14, 0xF4D50D87);
P(B, C, D, A, 8, 20, 0x455A14ED);
P(A, B, C, D, 13, 5, 0xA9E3E905);
P(D, A, B, C, 2, 9, 0xFCEFA3F8);
P(C, D, A, B, 7, 14, 0x676F02D9);
P(B, C, D, A, 12, 20, 0x8D2A4C8A);
#undef F
#define F(x, y, z) (x ^ y ^ z)
P(A, B, C, D, 5, 4, 0xFFFA3942);
P(D, A, B, C, 8, 11, 0x8771F681);
P(C, D, A, B, 11, 16, 0x6D9D6122);
P(B, C, D, A, 14, 23, 0xFDE5380C);
P(A, B, C, D, 1, 4, 0xA4BEEA44);
P(D, A, B, C, 4, 11, 0x4BDECFA9);
P(C, D, A, B, 7, 16, 0xF6BB4B60);
P(B, C, D, A, 10, 23, 0xBEBFBC70);
P(A, B, C, D, 13, 4, 0x289B7EC6);
P(D, A, B, C, 0, 11, 0xEAA127FA);
P(C, D, A, B, 3, 16, 0xD4EF3085);
P(B, C, D, A, 6, 23, 0x04881D05);
P(A, B, C, D, 9, 4, 0xD9D4D039);
P(D, A, B, C, 12, 11, 0xE6DB99E5);
P(C, D, A, B, 15, 16, 0x1FA27CF8);
P(B, C, D, A, 2, 23, 0xC4AC5665);
#undef F
#define F(x, y, z) (y ^ (x | ~z))
P(A, B, C, D, 0, 6, 0xF4292244);
P(D, A, B, C, 7, 10, 0x432AFF97);
P(C, D, A, B, 14, 15, 0xAB9423A7);
P(B, C, D, A, 5, 21, 0xFC93A039);
P(A, B, C, D, 12, 6, 0x655B59C3);
P(D, A, B, C, 3, 10, 0x8F0CCC92);
P(C, D, A, B, 10, 15, 0xFFEFF47D);
P(B, C, D, A, 1, 21, 0x85845DD1);
P(A, B, C, D, 8, 6, 0x6FA87E4F);
P(D, A, B, C, 15, 10, 0xFE2CE6E0);
P(C, D, A, B, 6, 15, 0xA3014314);
P(B, C, D, A, 13, 21, 0x4E0811A1);
P(A, B, C, D, 4, 6, 0xF7537E82);
P(D, A, B, C, 11, 10, 0xBD3AF235);
P(C, D, A, B, 2, 15, 0x2AD7D2BB);
P(B, C, D, A, 9, 21, 0xEB86D391);
#undef F
ctx->state[0] += A;
ctx->state[1] += B;
ctx->state[2] += C;
ctx->state[3] += D;
}
} // namespace
void CRYPT_ArcFourSetup(CRYPT_rc4_context* s,
const uint8_t* key,
uint32_t length) {
s->x = 0;
s->y = 0;
for (int i = 0; i < kRC4ContextPermutationLength; ++i)
s->m[i] = i;
int j = 0;
for (int i = 0; i < kRC4ContextPermutationLength; ++i) {
j = (j + s->m[i] + (length ? key[i % length] : 0)) & 0xFF;
std::swap(s->m[i], s->m[j]);
}
}
void CRYPT_ArcFourCrypt(CRYPT_rc4_context* s, uint8_t* data, uint32_t length) {
for (uint32_t i = 0; i < length; ++i) {
s->x = (s->x + 1) & 0xFF;
s->y = (s->y + s->m[s->x]) & 0xFF;
std::swap(s->m[s->x], s->m[s->y]);
data[i] ^= s->m[(s->m[s->x] + s->m[s->y]) & 0xFF];
}
}
void CRYPT_ArcFourCryptBlock(uint8_t* pData,
uint32_t size,
const uint8_t* key,
uint32_t keylen) {
CRYPT_rc4_context s;
CRYPT_ArcFourSetup(&s, key, keylen);
CRYPT_ArcFourCrypt(&s, pData, size);
}
void CRYPT_MD5Start(CRYPT_md5_context* ctx) {
ctx->total[0] = 0;
ctx->total[1] = 0;
ctx->state[0] = 0x67452301;
ctx->state[1] = 0xEFCDAB89;
ctx->state[2] = 0x98BADCFE;
ctx->state[3] = 0x10325476;
}
void CRYPT_MD5Update(CRYPT_md5_context* ctx,
const uint8_t* input,
uint32_t length) {
uint32_t left, fill;
if (!length) {
return;
}
left = (ctx->total[0] >> 3) & 0x3F;
fill = 64 - left;
ctx->total[0] += length << 3;
ctx->total[1] += length >> 29;
ctx->total[0] &= 0xFFFFFFFF;
ctx->total[1] += ctx->total[0] < length << 3;
if (left && length >= fill) {
memcpy(ctx->buffer + left, input, fill);
md5_process(ctx, ctx->buffer);
length -= fill;
input += fill;
left = 0;
}
while (length >= 64) {
md5_process(ctx, input);
length -= 64;
input += 64;
}
if (length) {
memcpy(ctx->buffer + left, input, length);
}
}
void CRYPT_MD5Finish(CRYPT_md5_context* ctx, uint8_t digest[16]) {
uint32_t last, padn;
uint8_t msglen[8];
PUT_UINT32(ctx->total[0], msglen, 0);
PUT_UINT32(ctx->total[1], msglen, 4);
last = (ctx->total[0] >> 3) & 0x3F;
padn = (last < 56) ? (56 - last) : (120 - last);
CRYPT_MD5Update(ctx, md5_padding, padn);
CRYPT_MD5Update(ctx, msglen, 8);
PUT_UINT32(ctx->state[0], digest, 0);
PUT_UINT32(ctx->state[1], digest, 4);
PUT_UINT32(ctx->state[2], digest, 8);
PUT_UINT32(ctx->state[3], digest, 12);
}
void CRYPT_MD5Generate(const uint8_t* input,
uint32_t length,
uint8_t digest[16]) {
CRYPT_md5_context ctx;
CRYPT_MD5Start(&ctx);
CRYPT_MD5Update(&ctx, input, length);
CRYPT_MD5Finish(&ctx, digest);
}
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