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| 1 // Copyright 2014 PDFium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com | |
| 6 | |
| 7 #include "core/fpdfapi/fpdf_parser/cpdf_crypto_handler.h" | |
| 8 | |
| 9 #include <time.h> | |
| 10 | |
| 11 #include "core/fdrm/crypto/fx_crypt.h" | |
| 12 #include "core/fpdfapi/fpdf_parser/cpdf_parser.h" | |
| 13 #include "core/fpdfapi/fpdf_parser/cpdf_security_handler.h" | |
| 14 #include "core/fpdfapi/fpdf_parser/cpdf_simple_parser.h" | |
| 15 | |
| 16 void CPDF_CryptoHandler::CryptBlock(FX_BOOL bEncrypt, | |
| 17 uint32_t objnum, | |
| 18 uint32_t gennum, | |
| 19 const uint8_t* src_buf, | |
| 20 uint32_t src_size, | |
| 21 uint8_t* dest_buf, | |
| 22 uint32_t& dest_size) { | |
| 23 if (m_Cipher == FXCIPHER_NONE) { | |
| 24 FXSYS_memcpy(dest_buf, src_buf, src_size); | |
| 25 return; | |
| 26 } | |
| 27 uint8_t realkey[16]; | |
| 28 int realkeylen = 16; | |
| 29 if (m_Cipher != FXCIPHER_AES || m_KeyLen != 32) { | |
| 30 uint8_t key1[32]; | |
| 31 PopulateKey(objnum, gennum, key1); | |
| 32 | |
| 33 if (m_Cipher == FXCIPHER_AES) { | |
| 34 FXSYS_memcpy(key1 + m_KeyLen + 5, "sAlT", 4); | |
| 35 } | |
| 36 CRYPT_MD5Generate( | |
| 37 key1, m_Cipher == FXCIPHER_AES ? m_KeyLen + 9 : m_KeyLen + 5, realkey); | |
| 38 realkeylen = m_KeyLen + 5; | |
| 39 if (realkeylen > 16) { | |
| 40 realkeylen = 16; | |
| 41 } | |
| 42 } | |
| 43 if (m_Cipher == FXCIPHER_AES) { | |
| 44 CRYPT_AESSetKey(m_pAESContext, 16, m_KeyLen == 32 ? m_EncryptKey : realkey, | |
| 45 m_KeyLen, bEncrypt); | |
| 46 if (bEncrypt) { | |
| 47 uint8_t iv[16]; | |
| 48 for (int i = 0; i < 16; i++) { | |
| 49 iv[i] = (uint8_t)rand(); | |
| 50 } | |
| 51 CRYPT_AESSetIV(m_pAESContext, iv); | |
| 52 FXSYS_memcpy(dest_buf, iv, 16); | |
| 53 int nblocks = src_size / 16; | |
| 54 CRYPT_AESEncrypt(m_pAESContext, dest_buf + 16, src_buf, nblocks * 16); | |
| 55 uint8_t padding[16]; | |
| 56 FXSYS_memcpy(padding, src_buf + nblocks * 16, src_size % 16); | |
| 57 FXSYS_memset(padding + src_size % 16, 16 - src_size % 16, | |
| 58 16 - src_size % 16); | |
| 59 CRYPT_AESEncrypt(m_pAESContext, dest_buf + nblocks * 16 + 16, padding, | |
| 60 16); | |
| 61 dest_size = 32 + nblocks * 16; | |
| 62 } else { | |
| 63 CRYPT_AESSetIV(m_pAESContext, src_buf); | |
| 64 CRYPT_AESDecrypt(m_pAESContext, dest_buf, src_buf + 16, src_size - 16); | |
| 65 dest_size = src_size - 16; | |
| 66 dest_size -= dest_buf[dest_size - 1]; | |
| 67 } | |
| 68 } else { | |
| 69 ASSERT(dest_size == src_size); | |
| 70 if (dest_buf != src_buf) { | |
| 71 FXSYS_memcpy(dest_buf, src_buf, src_size); | |
| 72 } | |
| 73 CRYPT_ArcFourCryptBlock(dest_buf, dest_size, realkey, realkeylen); | |
| 74 } | |
| 75 } | |
| 76 | |
| 77 struct AESCryptContext { | |
| 78 uint8_t m_Context[2048]; | |
| 79 FX_BOOL m_bIV; | |
| 80 uint8_t m_Block[16]; | |
| 81 uint32_t m_BlockOffset; | |
| 82 }; | |
| 83 | |
| 84 void* CPDF_CryptoHandler::CryptStart(uint32_t objnum, | |
| 85 uint32_t gennum, | |
| 86 FX_BOOL bEncrypt) { | |
| 87 if (m_Cipher == FXCIPHER_NONE) { | |
| 88 return this; | |
| 89 } | |
| 90 if (m_Cipher == FXCIPHER_AES && m_KeyLen == 32) { | |
| 91 AESCryptContext* pContext = FX_Alloc(AESCryptContext, 1); | |
| 92 pContext->m_bIV = TRUE; | |
| 93 pContext->m_BlockOffset = 0; | |
| 94 CRYPT_AESSetKey(pContext->m_Context, 16, m_EncryptKey, 32, bEncrypt); | |
| 95 if (bEncrypt) { | |
| 96 for (int i = 0; i < 16; i++) { | |
| 97 pContext->m_Block[i] = (uint8_t)rand(); | |
| 98 } | |
| 99 CRYPT_AESSetIV(pContext->m_Context, pContext->m_Block); | |
| 100 } | |
| 101 return pContext; | |
| 102 } | |
| 103 uint8_t key1[48]; | |
| 104 PopulateKey(objnum, gennum, key1); | |
| 105 | |
| 106 if (m_Cipher == FXCIPHER_AES) { | |
| 107 FXSYS_memcpy(key1 + m_KeyLen + 5, "sAlT", 4); | |
| 108 } | |
| 109 uint8_t realkey[16]; | |
| 110 CRYPT_MD5Generate( | |
| 111 key1, m_Cipher == FXCIPHER_AES ? m_KeyLen + 9 : m_KeyLen + 5, realkey); | |
| 112 int realkeylen = m_KeyLen + 5; | |
| 113 if (realkeylen > 16) { | |
| 114 realkeylen = 16; | |
| 115 } | |
| 116 if (m_Cipher == FXCIPHER_AES) { | |
| 117 AESCryptContext* pContext = FX_Alloc(AESCryptContext, 1); | |
| 118 pContext->m_bIV = TRUE; | |
| 119 pContext->m_BlockOffset = 0; | |
| 120 CRYPT_AESSetKey(pContext->m_Context, 16, realkey, 16, bEncrypt); | |
| 121 if (bEncrypt) { | |
| 122 for (int i = 0; i < 16; i++) { | |
| 123 pContext->m_Block[i] = (uint8_t)rand(); | |
| 124 } | |
| 125 CRYPT_AESSetIV(pContext->m_Context, pContext->m_Block); | |
| 126 } | |
| 127 return pContext; | |
| 128 } | |
| 129 void* pContext = FX_Alloc(uint8_t, 1040); | |
| 130 CRYPT_ArcFourSetup(pContext, realkey, realkeylen); | |
| 131 return pContext; | |
| 132 } | |
| 133 | |
| 134 FX_BOOL CPDF_CryptoHandler::CryptStream(void* context, | |
| 135 const uint8_t* src_buf, | |
| 136 uint32_t src_size, | |
| 137 CFX_BinaryBuf& dest_buf, | |
| 138 FX_BOOL bEncrypt) { | |
| 139 if (!context) { | |
| 140 return FALSE; | |
| 141 } | |
| 142 if (m_Cipher == FXCIPHER_NONE) { | |
| 143 dest_buf.AppendBlock(src_buf, src_size); | |
| 144 return TRUE; | |
| 145 } | |
| 146 if (m_Cipher == FXCIPHER_RC4) { | |
| 147 int old_size = dest_buf.GetSize(); | |
| 148 dest_buf.AppendBlock(src_buf, src_size); | |
| 149 CRYPT_ArcFourCrypt(context, dest_buf.GetBuffer() + old_size, src_size); | |
| 150 return TRUE; | |
| 151 } | |
| 152 AESCryptContext* pContext = (AESCryptContext*)context; | |
| 153 if (pContext->m_bIV && bEncrypt) { | |
| 154 dest_buf.AppendBlock(pContext->m_Block, 16); | |
| 155 pContext->m_bIV = FALSE; | |
| 156 } | |
| 157 uint32_t src_off = 0; | |
| 158 uint32_t src_left = src_size; | |
| 159 while (1) { | |
| 160 uint32_t copy_size = 16 - pContext->m_BlockOffset; | |
| 161 if (copy_size > src_left) { | |
| 162 copy_size = src_left; | |
| 163 } | |
| 164 FXSYS_memcpy(pContext->m_Block + pContext->m_BlockOffset, src_buf + src_off, | |
| 165 copy_size); | |
| 166 src_off += copy_size; | |
| 167 src_left -= copy_size; | |
| 168 pContext->m_BlockOffset += copy_size; | |
| 169 if (pContext->m_BlockOffset == 16) { | |
| 170 if (!bEncrypt && pContext->m_bIV) { | |
| 171 CRYPT_AESSetIV(pContext->m_Context, pContext->m_Block); | |
| 172 pContext->m_bIV = FALSE; | |
| 173 pContext->m_BlockOffset = 0; | |
| 174 } else if (src_off < src_size) { | |
| 175 uint8_t block_buf[16]; | |
| 176 if (bEncrypt) { | |
| 177 CRYPT_AESEncrypt(pContext->m_Context, block_buf, pContext->m_Block, | |
| 178 16); | |
| 179 } else { | |
| 180 CRYPT_AESDecrypt(pContext->m_Context, block_buf, pContext->m_Block, | |
| 181 16); | |
| 182 } | |
| 183 dest_buf.AppendBlock(block_buf, 16); | |
| 184 pContext->m_BlockOffset = 0; | |
| 185 } | |
| 186 } | |
| 187 if (!src_left) { | |
| 188 break; | |
| 189 } | |
| 190 } | |
| 191 return TRUE; | |
| 192 } | |
| 193 FX_BOOL CPDF_CryptoHandler::CryptFinish(void* context, | |
| 194 CFX_BinaryBuf& dest_buf, | |
| 195 FX_BOOL bEncrypt) { | |
| 196 if (!context) { | |
| 197 return FALSE; | |
| 198 } | |
| 199 if (m_Cipher == FXCIPHER_NONE) { | |
| 200 return TRUE; | |
| 201 } | |
| 202 if (m_Cipher == FXCIPHER_RC4) { | |
| 203 FX_Free(context); | |
| 204 return TRUE; | |
| 205 } | |
| 206 AESCryptContext* pContext = (AESCryptContext*)context; | |
| 207 if (bEncrypt) { | |
| 208 uint8_t block_buf[16]; | |
| 209 if (pContext->m_BlockOffset == 16) { | |
| 210 CRYPT_AESEncrypt(pContext->m_Context, block_buf, pContext->m_Block, 16); | |
| 211 dest_buf.AppendBlock(block_buf, 16); | |
| 212 pContext->m_BlockOffset = 0; | |
| 213 } | |
| 214 FXSYS_memset(pContext->m_Block + pContext->m_BlockOffset, | |
| 215 (uint8_t)(16 - pContext->m_BlockOffset), | |
| 216 16 - pContext->m_BlockOffset); | |
| 217 CRYPT_AESEncrypt(pContext->m_Context, block_buf, pContext->m_Block, 16); | |
| 218 dest_buf.AppendBlock(block_buf, 16); | |
| 219 } else if (pContext->m_BlockOffset == 16) { | |
| 220 uint8_t block_buf[16]; | |
| 221 CRYPT_AESDecrypt(pContext->m_Context, block_buf, pContext->m_Block, 16); | |
| 222 if (block_buf[15] <= 16) { | |
| 223 dest_buf.AppendBlock(block_buf, 16 - block_buf[15]); | |
| 224 } | |
| 225 } | |
| 226 FX_Free(pContext); | |
| 227 return TRUE; | |
| 228 } | |
| 229 | |
| 230 void CPDF_CryptoHandler::Decrypt(uint32_t objnum, | |
| 231 uint32_t gennum, | |
| 232 CFX_ByteString& str) { | |
| 233 CFX_BinaryBuf dest_buf; | |
| 234 void* context = DecryptStart(objnum, gennum); | |
| 235 DecryptStream(context, str.raw_str(), str.GetLength(), dest_buf); | |
| 236 DecryptFinish(context, dest_buf); | |
| 237 str = CFX_ByteString(dest_buf.GetBuffer(), dest_buf.GetSize()); | |
| 238 } | |
| 239 | |
| 240 void* CPDF_CryptoHandler::DecryptStart(uint32_t objnum, uint32_t gennum) { | |
| 241 return CryptStart(objnum, gennum, FALSE); | |
| 242 } | |
| 243 uint32_t CPDF_CryptoHandler::DecryptGetSize(uint32_t src_size) { | |
| 244 return m_Cipher == FXCIPHER_AES ? src_size - 16 : src_size; | |
| 245 } | |
| 246 | |
| 247 FX_BOOL CPDF_CryptoHandler::Init(CPDF_Dictionary* pEncryptDict, | |
| 248 CPDF_SecurityHandler* pSecurityHandler) { | |
| 249 const uint8_t* key; | |
| 250 if (!pSecurityHandler->GetCryptInfo(m_Cipher, key, m_KeyLen)) { | |
| 251 return FALSE; | |
| 252 } | |
| 253 if (m_KeyLen > 32 || m_KeyLen < 0) { | |
| 254 return FALSE; | |
| 255 } | |
| 256 if (m_Cipher != FXCIPHER_NONE) { | |
| 257 FXSYS_memcpy(m_EncryptKey, key, m_KeyLen); | |
| 258 } | |
| 259 if (m_Cipher == FXCIPHER_AES) { | |
| 260 m_pAESContext = FX_Alloc(uint8_t, 2048); | |
| 261 } | |
| 262 return TRUE; | |
| 263 } | |
| 264 | |
| 265 FX_BOOL CPDF_CryptoHandler::Init(int cipher, const uint8_t* key, int keylen) { | |
| 266 if (cipher == FXCIPHER_AES) { | |
| 267 switch (keylen) { | |
| 268 case 16: | |
| 269 case 24: | |
| 270 case 32: | |
| 271 break; | |
| 272 default: | |
| 273 return FALSE; | |
| 274 } | |
| 275 } else if (cipher == FXCIPHER_AES2) { | |
| 276 if (keylen != 32) { | |
| 277 return FALSE; | |
| 278 } | |
| 279 } else if (cipher == FXCIPHER_RC4) { | |
| 280 if (keylen < 5 || keylen > 16) { | |
| 281 return FALSE; | |
| 282 } | |
| 283 } else { | |
| 284 if (keylen > 32) { | |
| 285 keylen = 32; | |
| 286 } | |
| 287 } | |
| 288 m_Cipher = cipher; | |
| 289 m_KeyLen = keylen; | |
| 290 FXSYS_memcpy(m_EncryptKey, key, keylen); | |
| 291 if (m_Cipher == FXCIPHER_AES) { | |
| 292 m_pAESContext = FX_Alloc(uint8_t, 2048); | |
| 293 } | |
| 294 return TRUE; | |
| 295 } | |
| 296 FX_BOOL CPDF_CryptoHandler::DecryptStream(void* context, | |
| 297 const uint8_t* src_buf, | |
| 298 uint32_t src_size, | |
| 299 CFX_BinaryBuf& dest_buf) { | |
| 300 return CryptStream(context, src_buf, src_size, dest_buf, FALSE); | |
| 301 } | |
| 302 FX_BOOL CPDF_CryptoHandler::DecryptFinish(void* context, | |
| 303 CFX_BinaryBuf& dest_buf) { | |
| 304 return CryptFinish(context, dest_buf, FALSE); | |
| 305 } | |
| 306 uint32_t CPDF_CryptoHandler::EncryptGetSize(uint32_t objnum, | |
| 307 uint32_t version, | |
| 308 const uint8_t* src_buf, | |
| 309 uint32_t src_size) { | |
| 310 if (m_Cipher == FXCIPHER_AES) { | |
| 311 return src_size + 32; | |
| 312 } | |
| 313 return src_size; | |
| 314 } | |
| 315 FX_BOOL CPDF_CryptoHandler::EncryptContent(uint32_t objnum, | |
| 316 uint32_t gennum, | |
| 317 const uint8_t* src_buf, | |
| 318 uint32_t src_size, | |
| 319 uint8_t* dest_buf, | |
| 320 uint32_t& dest_size) { | |
| 321 CryptBlock(TRUE, objnum, gennum, src_buf, src_size, dest_buf, dest_size); | |
| 322 return TRUE; | |
| 323 } | |
| 324 CPDF_CryptoHandler::CPDF_CryptoHandler() { | |
| 325 m_pAESContext = nullptr; | |
| 326 m_Cipher = FXCIPHER_NONE; | |
| 327 m_KeyLen = 0; | |
| 328 } | |
| 329 CPDF_CryptoHandler::~CPDF_CryptoHandler() { | |
| 330 FX_Free(m_pAESContext); | |
| 331 } | |
| 332 | |
| 333 void CPDF_CryptoHandler::PopulateKey(uint32_t objnum, | |
| 334 uint32_t gennum, | |
| 335 uint8_t* key) { | |
| 336 FXSYS_memcpy(key, m_EncryptKey, m_KeyLen); | |
| 337 key[m_KeyLen + 0] = (uint8_t)objnum; | |
| 338 key[m_KeyLen + 1] = (uint8_t)(objnum >> 8); | |
| 339 key[m_KeyLen + 2] = (uint8_t)(objnum >> 16); | |
| 340 key[m_KeyLen + 3] = (uint8_t)gennum; | |
| 341 key[m_KeyLen + 4] = (uint8_t)(gennum >> 8); | |
| 342 } | |
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Chromium Code Reviews
Issue 2392603004:
Move core/fpdfapi/fpdf_parser to core/fpdfapi/parser (Closed)
