Fixup crypto key generation.

core/fpdfapi/fpdf_parser/cpdf_crypto_handler.cpp

Index: core/fpdfapi/fpdf_parser/cpdf_crypto_handler.cpp
diff --git a/core/fpdfapi/fpdf_parser/cpdf_crypto_handler.cpp b/core/fpdfapi/fpdf_parser/cpdf_crypto_handler.cpp
index 3cd973c277b05ef964fd0fa927207a9d95cdf9be..8e62d0f3bf7f7f0646e3056bac8786147a65d2f1 100644
--- a/core/fpdfapi/fpdf_parser/cpdf_crypto_handler.cpp
+++ b/core/fpdfapi/fpdf_parser/cpdf_crypto_handler.cpp
@@ -34,8 +34,6 @@ void CPDF_CryptoHandler::CryptBlock(FX_BOOL bEncrypt,
     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);
     }
@@ -108,8 +106,11 @@ void* CPDF_CryptoHandler::CryptStart(uint32_t objnum,
   }
   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);
+  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);
   if (m_Cipher == FXCIPHER_AES) {
     FXSYS_memcpy(key1 + m_KeyLen + 5, "sAlT", 4);
   }