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calculate encryption key

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Kulikova Svetlana
2022-03-21 17:32:45 +03:00
parent 4decd0c631
commit 02fa4142a7
7 changed files with 37 additions and 36 deletions
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29
PdfWriter/Src/Encrypt.cpp
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@ -139,11 +139,34 @@ namespace PdfWriter
impl->m_sUserPassword = sUserPassword;
impl->m_sOwnerPassword = sOwnerPassword;
}
bool CEncrypt::SetKey(const BYTE* pSrc, unsigned int unLen)
bool CEncrypt::UpdateKey()
{
if (unLen == m_unKeyLen)
CryptoPP::SHA256 hash;
hash.Update( (unsigned char*) impl->m_sUserPassword.c_str(), impl->m_sUserPassword.length());
hash.Update( m_anUserKey + 32, 8);
CryptoPP::SecByteBlock pHashData(hash.DigestSize());
hash.Final(pHashData);
if (MakeFileKey3(impl->m_sUserPassword, pHashData.data(), pHashData.size()) && 0 == memcmp(pHashData.data(), m_anUserKey, 32))
{
memcpy(impl->m_anEncryptionKey, pSrc, m_unKeyLen);
hash.Update( (unsigned char*) impl->m_sUserPassword.c_str(), impl->m_sUserPassword.length());
hash.Update( m_anUserKey + 40, 8);
CryptoPP::SecByteBlock pHashKeyData(hash.DigestSize());
hash.Final(pHashKeyData);
MakeFileKey3(impl->m_sUserPassword, pHashKeyData.data(), pHashKeyData.size());
unsigned char empty[16] = {};
CryptoPP::AES::Decryption aesDecryption(pHashKeyData.data(), pHashKeyData.size());
CryptoPP::CBC_Mode_ExternalCipher::Decryption cbcDecryption( aesDecryption, empty);
CryptoPP::StreamTransformationFilter stfDecryptor(cbcDecryption, new CryptoPP::ArraySink( impl->m_anEncryptionKey, 32), CryptoPP::StreamTransformationFilter::NO_PADDING );
stfDecryptor.Put2(m_anUserEncryptKey, 32, 1, true);
stfDecryptor.MessageEnd();
return true;
}
return false;