/// <summary>
/// Decrypts the specified encrypted e-KYC response data received from UIDAI.
/// </summary>
/// <param name="kycInfo">The encrypted e-KYC data.</param>
/// <returns>The decrypted e-KYC data.</returns>
/// <exception cref="ArgumentNullException"><paramref name="kycInfo"/> or <see cref="EncryptedKycInfo.InfoValue"/> is null.</exception>
public DecryptedKycInfo Decrypt(EncryptedKycInfo kycInfo)
{
ValidateNull(kycInfo, nameof(kycInfo));
ValidateNull(kycInfo.InfoValue, nameof(EncryptedKycInfo.InfoValue));
var iv = new byte[kycInfo.OaepLabel.Count];
Buffer.BlockCopy(kycInfo.OaepLabel.Array, kycInfo.OaepLabel.Offset, iv, 0, iv.Length);
// Decrypt Key
var oaep = new OaepEncoding(new RsaEngine(), new Sha256Digest(), iv);
oaep.Init(false, DotNetUtilities.GetRsaKeyPair(KuaKey.GetRSAPrivateKey()).Private);
var key = oaep.ProcessBlock(kycInfo.EncryptedKey.Array, kycInfo.EncryptedKey.Offset, kycInfo.EncryptedKey.Count);
// Decrypt Data
var cipher = CipherUtilities.GetCipher(SymmetricAlgorithm);
var parameter = new ParametersWithIV(new KeyParameter(key), iv, 0, 16);
cipher.Init(false, parameter);
var data = cipher.DoFinal(kycInfo.EncryptedData.Array, kycInfo.EncryptedData.Offset, kycInfo.EncryptedData.Count);
return(new DecryptedKycInfo {
InfoValue = data
});
}
/// <summary>
/// When overridden in a descendant class, deserializes the object from an XML according to Aadhaar API specification.
/// </summary>
/// <param name="element">An instance of <see cref="XElement"/>.</param>
/// <exception cref="ArgumentNullException"><paramref name="element"/> is null.</exception>
protected override void DeserializeXml(XElement element)
{
ValidateNull(element, nameof(element));
IsAuthentic = element.Attribute("ret").Value[0] == AadhaarHelper.YesUpper;
ResponseCode = element.Attribute("code").Value;
Timestamp = DateTimeOffset.Parse(element.Attribute("ts").Value, CultureInfo.InvariantCulture);
ErrorCode = element.Attribute("err")?.Value;
if (!string.IsNullOrWhiteSpace(ErrorCode))
{
return;
}
IsDecryptionByKsa = element.Attribute("ko").Value == "KSA";
if (!IsDecryptionByKsa)
{
var encryptedKycInfo = new EncryptedKycInfo {
InfoValue = Convert.FromBase64String(element.Element("kycRes").Value)
};
var decryptedKycInfo = encryptedKycInfo.Decrypt(Decryptor);
element = decryptedKycInfo.ToXml();
}
var authBytes = Convert.FromBase64String(element.Element("Rar").Value);
using (var stream = new MemoryStream(authBytes))
base.DeserializeXml(XElement.Load(stream));
TimeToLive = DateTimeOffset.ParseExact(element.Attribute("ttl").Value, AadhaarHelper.TimestampFormat, CultureInfo.InvariantCulture);
var uidData = element.Element("UidData");
Resident = new PersonalInfo
{
AadhaarNumber = uidData.Attribute("uid").Value,
Demographic = new Demographic
{
Address = new Address(uidData.Element("Poa")),
Identity = new Identity(uidData.Element("Poi"))
},
Photo = Convert.FromBase64String(uidData.Element("Pht").Value)
};
var localAddress = uidData.Element("LData");
if (localAddress != null)
{
Resident.Demographic.ILAddress = new Address(localAddress);
Resident.Demographic.LanguageUsed = (IndianLanguage?)int.Parse(localAddress.Attribute("lang").Value);
}
EAadhaar = new AadhaarDocument {
Content = uidData.Element("Prn").Value
};
}
