| // 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" |
| #include "../../../src/fxcrt/fx_safe_types.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 |