Team,
Below is the code mentioned in the article https://developer.visa.com/pages/encryption_guide for decrypting .
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static class EncryptionUtils {
private static final String BEGIN_CERT = "-----BEGIN CERTIFICATE-----";
private static final String END_CERT = "-----END CERTIFICATE-----";
private static final String BEGIN_RSA_PRIVATE_KEY = "-----BEGIN RSA PRIVATE KEY-----";
private static final String END_RSA_PRIVATE_KEY = "-----END RSA PRIVATE KEY-----";
private static final String ENC_DATA = "encData";
public static <T> T getDecryptedPayload(EncryptedResponse encryptedPayload, Class<T> returnType) {
// there is no info about EncryptedResponse class to which package/library it belongs to
String response = encryptedPayload.getEncData();
T decryptedResponse = null;
try {
JWEObject jweObject = JWEObject.parse(response);
//If you have used passphrase while generating the csr make sure you the same while getting the private key. Otherwise decryption will fail.
jweObject.decrypt(new RSADecrypter(getRSAPrivateKey()));
response = jweObject.getPayload().toString();
ObjectMapper mapper = new ObjectMapper();
decryptedResponse = mapper.readValue(response, returnType);
} catch (Exception e) {
e.printStackTrace();
}
return decryptedResponse;
}
/*
* Converts PEM file content to RSAPrivateKey
*/
private static PrivateKey getRSAPrivateKey() throws IOException, NoSuchAlgorithmException, InvalidKeySpecException {
//If you have used passphrase while generating the csr make sure you the same while reading the private key. Otherwise decryption will fail.
String pemEncodedKey = IOUtils.readFileToString(new File(mleClientPrivateKeyPath), Charset.forName("UTF-8"));
Base64 base64 = new Base64(pemEncodedKey.replaceAll(BEGIN_RSA_PRIVATE_KEY, "").replaceAll(END_RSA_PRIVATE_KEY, ""));
ASN1Sequence primitive = (ASN1Sequence) ASN1Sequence.fromByteArray(base64.decode());
Enumeration<?> e = primitive.getObjects();
BigInteger v = ((ASN1Integer) e.nextElement()).getValue();
int version = v.intValue();
if (version != 0 && version != 1) {
throw new IllegalArgumentException("wrong version for RSA private key");
}
BigInteger modulus = ((ASN1Integer) e.nextElement()).getValue();
((ASN1Integer) e.nextElement()).getValue();
BigInteger privateExponent = ((ASN1Integer) e.nextElement()).getValue();
((ASN1Integer) e.nextElement()).getValue();
((ASN1Integer) e.nextElement()).getValue();
((ASN1Integer) e.nextElement()).getValue();
((ASN1Integer) e.nextElement()).getValue();
((ASN1Integer) e.nextElement()).getValue();
RSAPrivateKeySpec privateKeySpec = new RSAPrivateKeySpec(modulus, privateExponent);
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
return (PrivateKey) keyFactory.generatePrivate(privateKeySpec);
}
}
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Please provide information about EncryptedResponse class library and its maven dependency if required.
