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Unified Diff: core/src/fpdfapi/fpdf_parser/cpdf_standard_security_handler.cpp

Issue 1781593003: Split off IPDF_SecurityHandler and CPDF_StandardSecurityHandler. (Closed) Base URL: https://pdfium.googlesource.com/pdfium.git@master
Patch Set: Nits Created 4 years, 9 months ago
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Index: core/src/fpdfapi/fpdf_parser/cpdf_standard_security_handler.cpp
diff --git a/core/src/fpdfapi/fpdf_parser/fpdf_parser_encrypt.cpp b/core/src/fpdfapi/fpdf_parser/cpdf_standard_security_handler.cpp
similarity index 66%
copy from core/src/fpdfapi/fpdf_parser/fpdf_parser_encrypt.cpp
copy to core/src/fpdfapi/fpdf_parser/cpdf_standard_security_handler.cpp
index 9fe534ec35339224593249810fa89b17f86458d2..84da42ec194d1001da19b19c3b51dd9d1f0cba2c 100644
--- a/core/src/fpdfapi/fpdf_parser/fpdf_parser_encrypt.cpp
+++ b/core/src/fpdfapi/fpdf_parser/cpdf_standard_security_handler.cpp
@@ -4,18 +4,19 @@
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
-#include "core/include/fpdfapi/fpdf_parser.h"
-
-#include <time.h>
+#include "core/src/fpdfapi/fpdf_parser/cpdf_standard_security_handler.h"
-#include "core/include/fpdfapi/cpdf_parser.h"
-#include "core/include/fpdfapi/cpdf_simple_parser.h"
#include "core/include/fdrm/fx_crypt.h"
+#include "core/include/fpdfapi/cpdf_parser.h"
+#include "core/include/fpdfapi/fpdf_parser.h"
+
+namespace {
const uint8_t defpasscode[32] = {
0x28, 0xbf, 0x4e, 0x5e, 0x4e, 0x75, 0x8a, 0x41, 0x64, 0x00, 0x4e,
0x56, 0xff, 0xfa, 0x01, 0x08, 0x2e, 0x2e, 0x00, 0xb6, 0xd0, 0x68,
0x3e, 0x80, 0x2f, 0x0c, 0xa9, 0xfe, 0x64, 0x53, 0x69, 0x7a};
+
void CalcEncryptKey(CPDF_Dictionary* pEncrypt,
const uint8_t* password,
FX_DWORD pass_size,
@@ -59,16 +60,9 @@ void CalcEncryptKey(CPDF_Dictionary* pEncrypt,
FXSYS_memcpy(key, digest, copy_len);
}
-CPDF_CryptoHandler* CPDF_StandardSecurityHandler::CreateCryptoHandler() {
- return new CPDF_StandardCryptoHandler;
-}
+} // namespace
-struct PDF_CRYPTOITEM {
- int32_t m_Cipher;
- int32_t m_KeyLen;
- FX_BOOL m_bChecked;
- CPDF_StandardCryptoHandler* m_pCryptoHandler;
-};
+IPDF_SecurityHandler::~IPDF_SecurityHandler() {}
CPDF_StandardSecurityHandler::CPDF_StandardSecurityHandler() {
m_Version = 0;
@@ -81,6 +75,11 @@ CPDF_StandardSecurityHandler::CPDF_StandardSecurityHandler() {
}
CPDF_StandardSecurityHandler::~CPDF_StandardSecurityHandler() {}
+
+CPDF_CryptoHandler* CPDF_StandardSecurityHandler::CreateCryptoHandler() {
+ return new CPDF_StandardCryptoHandler;
+}
+
FX_BOOL CPDF_StandardSecurityHandler::OnInit(CPDF_Parser* pParser,
CPDF_Dictionary* pEncryptDict) {
m_pParser = pParser;
@@ -521,10 +520,6 @@ FX_BOOL CPDF_StandardSecurityHandler::IsMetadataEncrypted() {
return m_pEncryptDict->GetBooleanBy("EncryptMetadata", TRUE);
}
-IPDF_SecurityHandler* FPDF_CreateStandardSecurityHandler() {
- return new CPDF_StandardSecurityHandler;
-}
-
void CPDF_StandardSecurityHandler::OnCreate(CPDF_Dictionary* pEncryptDict,
CPDF_Array* pIdArray,
const uint8_t* user_pass,
@@ -712,327 +707,3 @@ void CPDF_StandardSecurityHandler::AES256_SetPerms(
FX_Free(aes);
pEncryptDict->SetAtString("Perms", CFX_ByteString(buf1, 16));
}
-void CPDF_StandardCryptoHandler::CryptBlock(FX_BOOL bEncrypt,
- FX_DWORD objnum,
- FX_DWORD gennum,
- const uint8_t* src_buf,
- FX_DWORD src_size,
- uint8_t* dest_buf,
- FX_DWORD& dest_size) {
- if (m_Cipher == FXCIPHER_NONE) {
- FXSYS_memcpy(dest_buf, src_buf, src_size);
- return;
- }
- uint8_t realkey[16];
- int realkeylen = 16;
- if (m_Cipher != FXCIPHER_AES || m_KeyLen != 32) {
- uint8_t key1[32];
- FXSYS_memcpy(key1, m_EncryptKey, m_KeyLen);
- key1[m_KeyLen + 0] = (uint8_t)objnum;
- key1[m_KeyLen + 1] = (uint8_t)(objnum >> 8);
- key1[m_KeyLen + 2] = (uint8_t)(objnum >> 16);
- key1[m_KeyLen + 3] = (uint8_t)gennum;
- key1[m_KeyLen + 4] = (uint8_t)(gennum >> 8);
- FXSYS_memcpy(key1 + m_KeyLen, &objnum, 3);
- FXSYS_memcpy(key1 + m_KeyLen + 3, &gennum, 2);
- if (m_Cipher == FXCIPHER_AES) {
- FXSYS_memcpy(key1 + m_KeyLen + 5, "sAlT", 4);
- }
- CRYPT_MD5Generate(
- key1, m_Cipher == FXCIPHER_AES ? m_KeyLen + 9 : m_KeyLen + 5, realkey);
- realkeylen = m_KeyLen + 5;
- if (realkeylen > 16) {
- realkeylen = 16;
- }
- }
- if (m_Cipher == FXCIPHER_AES) {
- CRYPT_AESSetKey(m_pAESContext, 16, m_KeyLen == 32 ? m_EncryptKey : realkey,
- m_KeyLen, bEncrypt);
- if (bEncrypt) {
- uint8_t iv[16];
- for (int i = 0; i < 16; i++) {
- iv[i] = (uint8_t)rand();
- }
- CRYPT_AESSetIV(m_pAESContext, iv);
- FXSYS_memcpy(dest_buf, iv, 16);
- int nblocks = src_size / 16;
- CRYPT_AESEncrypt(m_pAESContext, dest_buf + 16, src_buf, nblocks * 16);
- uint8_t padding[16];
- FXSYS_memcpy(padding, src_buf + nblocks * 16, src_size % 16);
- FXSYS_memset(padding + src_size % 16, 16 - src_size % 16,
- 16 - src_size % 16);
- CRYPT_AESEncrypt(m_pAESContext, dest_buf + nblocks * 16 + 16, padding,
- 16);
- dest_size = 32 + nblocks * 16;
- } else {
- CRYPT_AESSetIV(m_pAESContext, src_buf);
- CRYPT_AESDecrypt(m_pAESContext, dest_buf, src_buf + 16, src_size - 16);
- dest_size = src_size - 16;
- dest_size -= dest_buf[dest_size - 1];
- }
- } else {
- ASSERT(dest_size == src_size);
- if (dest_buf != src_buf) {
- FXSYS_memcpy(dest_buf, src_buf, src_size);
- }
- CRYPT_ArcFourCryptBlock(dest_buf, dest_size, realkey, realkeylen);
- }
-}
-
-struct AESCryptContext {
- uint8_t m_Context[2048];
- FX_BOOL m_bIV;
- uint8_t m_Block[16];
- FX_DWORD m_BlockOffset;
-};
-
-void* CPDF_StandardCryptoHandler::CryptStart(FX_DWORD objnum,
- FX_DWORD gennum,
- FX_BOOL bEncrypt) {
- if (m_Cipher == FXCIPHER_NONE) {
- return this;
- }
- if (m_Cipher == FXCIPHER_AES && m_KeyLen == 32) {
- AESCryptContext* pContext = FX_Alloc(AESCryptContext, 1);
- pContext->m_bIV = TRUE;
- pContext->m_BlockOffset = 0;
- CRYPT_AESSetKey(pContext->m_Context, 16, m_EncryptKey, 32, bEncrypt);
- if (bEncrypt) {
- for (int i = 0; i < 16; i++) {
- pContext->m_Block[i] = (uint8_t)rand();
- }
- CRYPT_AESSetIV(pContext->m_Context, pContext->m_Block);
- }
- return pContext;
- }
- uint8_t key1[48];
- FXSYS_memcpy(key1, m_EncryptKey, m_KeyLen);
- FXSYS_memcpy(key1 + m_KeyLen, &objnum, 3);
- FXSYS_memcpy(key1 + m_KeyLen + 3, &gennum, 2);
- if (m_Cipher == FXCIPHER_AES) {
- FXSYS_memcpy(key1 + m_KeyLen + 5, "sAlT", 4);
- }
- uint8_t realkey[16];
- CRYPT_MD5Generate(
- key1, m_Cipher == FXCIPHER_AES ? m_KeyLen + 9 : m_KeyLen + 5, realkey);
- int realkeylen = m_KeyLen + 5;
- if (realkeylen > 16) {
- realkeylen = 16;
- }
- if (m_Cipher == FXCIPHER_AES) {
- AESCryptContext* pContext = FX_Alloc(AESCryptContext, 1);
- pContext->m_bIV = TRUE;
- pContext->m_BlockOffset = 0;
- CRYPT_AESSetKey(pContext->m_Context, 16, realkey, 16, bEncrypt);
- if (bEncrypt) {
- for (int i = 0; i < 16; i++) {
- pContext->m_Block[i] = (uint8_t)rand();
- }
- CRYPT_AESSetIV(pContext->m_Context, pContext->m_Block);
- }
- return pContext;
- }
- void* pContext = FX_Alloc(uint8_t, 1040);
- CRYPT_ArcFourSetup(pContext, realkey, realkeylen);
- return pContext;
-}
-FX_BOOL CPDF_StandardCryptoHandler::CryptStream(void* context,
- const uint8_t* src_buf,
- FX_DWORD src_size,
- CFX_BinaryBuf& dest_buf,
- FX_BOOL bEncrypt) {
- if (!context) {
- return FALSE;
- }
- if (m_Cipher == FXCIPHER_NONE) {
- dest_buf.AppendBlock(src_buf, src_size);
- return TRUE;
- }
- if (m_Cipher == FXCIPHER_RC4) {
- int old_size = dest_buf.GetSize();
- dest_buf.AppendBlock(src_buf, src_size);
- CRYPT_ArcFourCrypt(context, dest_buf.GetBuffer() + old_size, src_size);
- return TRUE;
- }
- AESCryptContext* pContext = (AESCryptContext*)context;
- if (pContext->m_bIV && bEncrypt) {
- dest_buf.AppendBlock(pContext->m_Block, 16);
- pContext->m_bIV = FALSE;
- }
- FX_DWORD src_off = 0;
- FX_DWORD src_left = src_size;
- while (1) {
- FX_DWORD copy_size = 16 - pContext->m_BlockOffset;
- if (copy_size > src_left) {
- copy_size = src_left;
- }
- FXSYS_memcpy(pContext->m_Block + pContext->m_BlockOffset, src_buf + src_off,
- copy_size);
- src_off += copy_size;
- src_left -= copy_size;
- pContext->m_BlockOffset += copy_size;
- if (pContext->m_BlockOffset == 16) {
- if (!bEncrypt && pContext->m_bIV) {
- CRYPT_AESSetIV(pContext->m_Context, pContext->m_Block);
- pContext->m_bIV = FALSE;
- pContext->m_BlockOffset = 0;
- } else if (src_off < src_size) {
- uint8_t block_buf[16];
- if (bEncrypt) {
- CRYPT_AESEncrypt(pContext->m_Context, block_buf, pContext->m_Block,
- 16);
- } else {
- CRYPT_AESDecrypt(pContext->m_Context, block_buf, pContext->m_Block,
- 16);
- }
- dest_buf.AppendBlock(block_buf, 16);
- pContext->m_BlockOffset = 0;
- }
- }
- if (!src_left) {
- break;
- }
- }
- return TRUE;
-}
-FX_BOOL CPDF_StandardCryptoHandler::CryptFinish(void* context,
- CFX_BinaryBuf& dest_buf,
- FX_BOOL bEncrypt) {
- if (!context) {
- return FALSE;
- }
- if (m_Cipher == FXCIPHER_NONE) {
- return TRUE;
- }
- if (m_Cipher == FXCIPHER_RC4) {
- FX_Free(context);
- return TRUE;
- }
- AESCryptContext* pContext = (AESCryptContext*)context;
- if (bEncrypt) {
- uint8_t block_buf[16];
- if (pContext->m_BlockOffset == 16) {
- CRYPT_AESEncrypt(pContext->m_Context, block_buf, pContext->m_Block, 16);
- dest_buf.AppendBlock(block_buf, 16);
- pContext->m_BlockOffset = 0;
- }
- FXSYS_memset(pContext->m_Block + pContext->m_BlockOffset,
- (uint8_t)(16 - pContext->m_BlockOffset),
- 16 - pContext->m_BlockOffset);
- CRYPT_AESEncrypt(pContext->m_Context, block_buf, pContext->m_Block, 16);
- dest_buf.AppendBlock(block_buf, 16);
- } else if (pContext->m_BlockOffset == 16) {
- uint8_t block_buf[16];
- CRYPT_AESDecrypt(pContext->m_Context, block_buf, pContext->m_Block, 16);
- if (block_buf[15] <= 16) {
- dest_buf.AppendBlock(block_buf, 16 - block_buf[15]);
- }
- }
- FX_Free(pContext);
- return TRUE;
-}
-void* CPDF_StandardCryptoHandler::DecryptStart(FX_DWORD objnum,
- FX_DWORD gennum) {
- return CryptStart(objnum, gennum, FALSE);
-}
-FX_DWORD CPDF_StandardCryptoHandler::DecryptGetSize(FX_DWORD src_size) {
- return m_Cipher == FXCIPHER_AES ? src_size - 16 : src_size;
-}
-
-FX_BOOL CPDF_StandardCryptoHandler::Init(
- CPDF_Dictionary* pEncryptDict,
- IPDF_SecurityHandler* pSecurityHandler) {
- const uint8_t* key;
- if (!pSecurityHandler->GetCryptInfo(m_Cipher, key, m_KeyLen)) {
- return FALSE;
- }
- if (m_KeyLen > 32 || m_KeyLen < 0) {
- return FALSE;
- }
- if (m_Cipher != FXCIPHER_NONE) {
- FXSYS_memcpy(m_EncryptKey, key, m_KeyLen);
- }
- if (m_Cipher == FXCIPHER_AES) {
- m_pAESContext = FX_Alloc(uint8_t, 2048);
- }
- return TRUE;
-}
-
-FX_BOOL CPDF_StandardCryptoHandler::Init(int cipher,
- const uint8_t* key,
- int keylen) {
- if (cipher == FXCIPHER_AES) {
- switch (keylen) {
- case 16:
- case 24:
- case 32:
- break;
- default:
- return FALSE;
- }
- } else if (cipher == FXCIPHER_AES2) {
- if (keylen != 32) {
- return FALSE;
- }
- } else if (cipher == FXCIPHER_RC4) {
- if (keylen < 5 || keylen > 16) {
- return FALSE;
- }
- } else {
- if (keylen > 32) {
- keylen = 32;
- }
- }
- m_Cipher = cipher;
- m_KeyLen = keylen;
- FXSYS_memcpy(m_EncryptKey, key, keylen);
- if (m_Cipher == FXCIPHER_AES) {
- m_pAESContext = FX_Alloc(uint8_t, 2048);
- }
- return TRUE;
-}
-FX_BOOL CPDF_StandardCryptoHandler::DecryptStream(void* context,
- const uint8_t* src_buf,
- FX_DWORD src_size,
- CFX_BinaryBuf& dest_buf) {
- return CryptStream(context, src_buf, src_size, dest_buf, FALSE);
-}
-FX_BOOL CPDF_StandardCryptoHandler::DecryptFinish(void* context,
- CFX_BinaryBuf& dest_buf) {
- return CryptFinish(context, dest_buf, FALSE);
-}
-FX_DWORD CPDF_StandardCryptoHandler::EncryptGetSize(FX_DWORD objnum,
- FX_DWORD version,
- const uint8_t* src_buf,
- FX_DWORD src_size) {
- if (m_Cipher == FXCIPHER_AES) {
- return src_size + 32;
- }
- return src_size;
-}
-FX_BOOL CPDF_StandardCryptoHandler::EncryptContent(FX_DWORD objnum,
- FX_DWORD gennum,
- const uint8_t* src_buf,
- FX_DWORD src_size,
- uint8_t* dest_buf,
- FX_DWORD& dest_size) {
- CryptBlock(TRUE, objnum, gennum, src_buf, src_size, dest_buf, dest_size);
- return TRUE;
-}
-void CPDF_CryptoHandler::Decrypt(FX_DWORD objnum,
- FX_DWORD gennum,
- CFX_ByteString& str) {
- CFX_BinaryBuf dest_buf;
- void* context = DecryptStart(objnum, gennum);
- DecryptStream(context, (const uint8_t*)str, str.GetLength(), dest_buf);
- DecryptFinish(context, dest_buf);
- str = dest_buf;
-}
-CPDF_StandardCryptoHandler::CPDF_StandardCryptoHandler() {
- m_pAESContext = NULL;
- m_Cipher = FXCIPHER_NONE;
- m_KeyLen = 0;
-}
-CPDF_StandardCryptoHandler::~CPDF_StandardCryptoHandler() {
- FX_Free(m_pAESContext);
-}
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