// 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/fxcrt/fx_basic.h" | |
#include "../../../include/fdrm/fx_crypt.h" | |
#ifdef __cplusplus | |
extern "C" { | |
#endif | |
struct rc4_state { | |
int x, y, m[256]; | |
}; | |
void CRYPT_ArcFourSetup(void* context, FX_LPCBYTE 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(FX_LPBYTE pData, FX_DWORD size, FX_LPCBYTE 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]; | |
FX_BYTE buffer[64]; | |
}; | |
#define GET_FX_DWORD(n,b,i) \ | |
{ \ | |
(n) = (FX_DWORD) ((FX_BYTE *) b)[(i)] \ | |
| (((FX_DWORD) ((FX_BYTE *) b)[(i)+1]) << 8) \ | |
| (((FX_DWORD) ((FX_BYTE *) b)[(i)+2]) << 16) \ | |
| (((FX_DWORD) ((FX_BYTE *) b)[(i)+3]) << 24); \ | |
} | |
#define PUT_FX_DWORD(n,b,i) \ | |
{ \ | |
(((FX_BYTE *) b)[(i)] ) = (FX_BYTE) (((n) ) & 0xFF); \ | |
(((FX_BYTE *) b)[(i)+1]) = (FX_BYTE) (((n) >> 8) & 0xFF); \ | |
(((FX_BYTE *) b)[(i)+2]) = (FX_BYTE) (((n) >> 16) & 0xFF); \ | |
(((FX_BYTE *) b)[(i)+3]) = (FX_BYTE) (((n) >> 24) & 0xFF); \ | |
} | |
void md5_process( struct md5_context *ctx, const FX_BYTE 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(FX_LPVOID pctx, FX_LPCBYTE 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_memcpy32( (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_memcpy32( (void *) (ctx->buffer + left), (void *) input, length ); | |
} | |
} | |
const FX_BYTE 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(FX_LPVOID pctx, FX_BYTE digest[16] ) | |
{ | |
struct md5_context *ctx = (struct md5_context *)pctx; | |
FX_DWORD last, padn; | |
FX_BYTE 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(FX_LPCBYTE input, FX_DWORD length, FX_BYTE digest[16]) | |
{ | |
md5_context ctx; | |
CRYPT_MD5Start(&ctx); | |
CRYPT_MD5Update(&ctx, input, length); | |
CRYPT_MD5Finish(&ctx, digest); | |
} | |
static FX_BOOL (*g_PubKeyDecryptor)(FX_LPCBYTE pData, FX_DWORD size, FX_LPBYTE data_buf, FX_DWORD& data_len) = NULL; | |
void CRYPT_SetPubKeyDecryptor(FX_BOOL (*func)(FX_LPCBYTE pData, FX_DWORD size, FX_LPBYTE data_buf, FX_DWORD& data_len)) | |
{ | |
g_PubKeyDecryptor = func; | |
} | |
#ifdef __cplusplus | |
}; | |
#endif |