public SaleToPoiMessageSecured Encrypt(string saleToPoiMessage, MessageHeader messageHeader,
EncryptionCredentialDetails encryptionCredentialDetails)
{
var encryptionDerivedKey = _encryptionDerivedKeyGenerator.Generate(encryptionCredentialDetails);
var saleToPoiMessageJson = saleToPoiMessage;
var saleToPoiMessageByteArray = Encoding.ASCII.GetBytes(saleToPoiMessageJson);
var ivMod = _ivModGenerator.GenerateRandomMod();
var saleToPoiMessageAesEncrypted = _aesEncryptor.Encrypt(saleToPoiMessageByteArray,
encryptionDerivedKey,
ivMod);
var saleToPoiMessageAesEncryptedHmac = _hmacSha256Wrapper.HMac(saleToPoiMessageByteArray,
encryptionDerivedKey.HmacKey);
var saleToPoiMessageSecured = new SaleToPoiRequestSecured
{
MessageHeader = messageHeader,
NexoBlob = Convert.ToBase64String(saleToPoiMessageAesEncrypted),
SecurityTrailer = new SecurityTrailer
{
KeyVersion = encryptionCredentialDetails.KeyVersion,
KeyIdentifier = encryptionCredentialDetails.KeyIdentifier,
Hmac = saleToPoiMessageAesEncryptedHmac,
Nonce = ivMod,
AdyenCryptoVersion = encryptionCredentialDetails.AdyenCryptoVersion
}
};
return(saleToPoiMessageSecured);
}
public string Decrypt(SaleToPoiMessageSecured saleToPoiMessageSecured, EncryptionCredentialDetails encryptionCredentialDetails)
{
var encryptedSaleToPoiMessageByteArray = Convert.FromBase64String(saleToPoiMessageSecured.NexoBlob);
var encryptionDerivedKey = _encryptionDerivedKeyGenerator.Generate(encryptionCredentialDetails);
var decryptedSaleToPoiMessageByteArray = _aesEncryptor.Decrypt(encryptedSaleToPoiMessageByteArray,
encryptionDerivedKey,
saleToPoiMessageSecured.SecurityTrailer.Nonce);
return(System.Text.Encoding.UTF8.GetString(decryptedSaleToPoiMessageByteArray));
}
internal EncryptionDerivedKey Generate(EncryptionCredentialDetails encryptionCredentialDetails)
{
byte[] salt = Encoding.ASCII.GetBytes(Salt);
var rfc2898 = new Rfc2898DeriveBytes(encryptionCredentialDetails.Password, salt, Iterations);
byte[] key = rfc2898.GetBytes(80);
return(new EncryptionDerivedKey()
{
HmacKey = key.Slice(0, EncryptionDerivedKey.HmacKeyLength),
CipherKey = key.Slice(EncryptionDerivedKey.HmacKeyLength, EncryptionDerivedKey.HmacKeyLength + EncryptionDerivedKey.CipherKeyLength),
IV = key.Slice(EncryptionDerivedKey.HmacKeyLength + EncryptionDerivedKey.CipherKeyLength, EncryptionDerivedKey.HmacKeyLength + EncryptionDerivedKey.CipherKeyLength + EncryptionDerivedKey.IVLength)
});
}
