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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 "../../../include/fdrm/fx_crypt.h"
#ifdef __cplusplus
extern "C" {
#endif
struct rc4_state {
int x, y, m[256];
};
void CRYPT_ArcFourSetup(void* context, const uint8_t* key, FX_DWORD length )
{
rc4_state *s = (rc4_state*)context;
int i, j, k, *m, a;
s->x = 0;
s->y = 0;
m = s->m;
for( i = 0; i < 256; i++ ) {
m[i] = i;
}
j = k = 0;
for( i = 0; i < 256; i++ ) {
a = m[i];
j = ( j + a + key[k] ) & 0xFF;
m[i] = m[j];
m[j] = a;
if( ++k >= (int)length ) {
k = 0;
}
}
}
void CRYPT_ArcFourCrypt(void* context, unsigned char *data, FX_DWORD length )
{
struct rc4_state* s = (struct rc4_state*)context;
int i, x, y, *m, a, b;
x = s->x;
y = s->y;
m = s->m;
for( i = 0; i < (int)length; i++ ) {
x = ( x + 1 ) & 0xFF;
a = m[x];
y = ( y + a ) & 0xFF;
m[x] = b = m[y];
m[y] = a;
data[i] ^= m[( a + b ) & 0xFF];
}
s->x = x;
s->y = y;
}
void CRYPT_ArcFourCryptBlock(uint8_t* pData, FX_DWORD size, const uint8_t* key, FX_DWORD keylen)
{
rc4_state s;
CRYPT_ArcFourSetup(&s, key, keylen);
CRYPT_ArcFourCrypt(&s, pData, size);
}
struct md5_context {
FX_DWORD total[2];
FX_DWORD state[4];
uint8_t buffer[64];
};
#define GET_FX_DWORD(n,b,i) \
{ \
(n) = (FX_DWORD) ((uint8_t *) b)[(i)] \
| (((FX_DWORD) ((uint8_t *) b)[(i)+1]) << 8) \
| (((FX_DWORD) ((uint8_t *) b)[(i)+2]) << 16) \
| (((FX_DWORD) ((uint8_t *) b)[(i)+3]) << 24); \
}
#define PUT_FX_DWORD(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); \
}
void md5_process( struct md5_context *ctx, const uint8_t data[64] )
{
FX_DWORD A, B, C, D, X[16];
GET_FX_DWORD( X[0], data, 0 );
GET_FX_DWORD( X[1], data, 4 );
GET_FX_DWORD( X[2], data, 8 );
GET_FX_DWORD( X[3], data, 12 );
GET_FX_DWORD( X[4], data, 16 );
GET_FX_DWORD( X[5], data, 20 );
GET_FX_DWORD( X[6], data, 24 );
GET_FX_DWORD( X[7], data, 28 );
GET_FX_DWORD( X[8], data, 32 );
GET_FX_DWORD( X[9], data, 36 );
GET_FX_DWORD( X[10], data, 40 );
GET_FX_DWORD( X[11], data, 44 );
GET_FX_DWORD( X[12], data, 48 );
GET_FX_DWORD( X[13], data, 52 );
GET_FX_DWORD( X[14], data, 56 );
GET_FX_DWORD( 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;
}
void CRYPT_MD5Start(void* context)
{
struct md5_context *ctx = (struct md5_context*)context;
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(void* pctx, const uint8_t* input, FX_DWORD length )
{
struct md5_context *ctx = (struct md5_context *)pctx;
FX_DWORD 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 ) {
FXSYS_memcpy( (void *) (ctx->buffer + left), (void *) 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 ) {
FXSYS_memcpy( (void *) (ctx->buffer + left), (void *) input, length );
}
}
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 CRYPT_MD5Finish(void* pctx, uint8_t digest[16] )
{
struct md5_context *ctx = (struct md5_context *)pctx;
FX_DWORD last, padn;
uint8_t msglen[8];
PUT_FX_DWORD( ctx->total[0], msglen, 0 );
PUT_FX_DWORD( 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_FX_DWORD( ctx->state[0], digest, 0 );
PUT_FX_DWORD( ctx->state[1], digest, 4 );
PUT_FX_DWORD( ctx->state[2], digest, 8 );
PUT_FX_DWORD( ctx->state[3], digest, 12 );
}
void CRYPT_MD5Generate(const uint8_t* input, FX_DWORD length, uint8_t digest[16])
{
md5_context ctx;
CRYPT_MD5Start(&ctx);
CRYPT_MD5Update(&ctx, input, length);
CRYPT_MD5Finish(&ctx, digest);
}
static FX_BOOL (*g_PubKeyDecryptor)(const uint8_t* pData, FX_DWORD size, uint8_t* data_buf, FX_DWORD& data_len) = NULL;
void CRYPT_SetPubKeyDecryptor(FX_BOOL (*func)(const uint8_t* pData, FX_DWORD size, uint8_t* data_buf, FX_DWORD& data_len))
{
g_PubKeyDecryptor = func;
}
#ifdef __cplusplus
};
#endif
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