io.getlime.security.powerauth.lib.util

Class SignatureUtils

java.lang.Object

io.getlime.security.powerauth.lib.util.SignatureUtils

public class SignatureUtils
extends Object

Utility class for signature calculation and validation used both on client and server.

Author:

Petr Dvorak

Constructor Summary

Constructors

Constructor and Description
SignatureUtils()

Method Summary

Modifier and Type	Method and Description
byte[]	computeECDSASignature(byte[] bytes, PrivateKey masterPrivateKey) Compute ECDSA signature of given bytes with a private key.
String	computePowerAuthSignature(byte[] data, List<SecretKey> signatureKeys, long counter) Compute PowerAuth 2.0 signature for given data using a secret signature keys and counter.
boolean	validateECDSASignature(byte[] signedBytes, byte[] signature, PublicKey masterPublicKey) Validate an ECDSA signature against given data using a public key.
boolean	validatePowerAuthSignature(byte[] data, String signature, List<SecretKey> signatureKeys, long counter) Validate the PowerAuth 2.0 signature for given data using provided keys.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

SignatureUtils

public SignatureUtils()

Method Detail

computeECDSASignature

public byte[] computeECDSASignature(byte[] bytes,
                                    PrivateKey masterPrivateKey)
                             throws InvalidKeyException,
                                    SignatureException

Compute ECDSA signature of given bytes with a private key.

Parameters:

bytes - Bytes to be signed.

masterPrivateKey - Private key for computing the signature.

Returns:

Signature for given data.

Throws:

InvalidKeyException - In case invalid key was provided.

SignatureException - In case signature calculation fails.

validateECDSASignature

public boolean validateECDSASignature(byte[] signedBytes,
                                      byte[] signature,
                                      PublicKey masterPublicKey)
                               throws InvalidKeyException,
                                      SignatureException

Validate an ECDSA signature against given data using a public key.

Parameters:

signedBytes - Bytes that are signed.

signature - Signature of the bytes.

masterPublicKey - Public key for validating the signature.

Returns:

Returns "true" if signature matches, "false" otherwise.

Throws:

InvalidKeyException - In case invalid key was provided.

SignatureException - In case signature calculation fails.

computePowerAuthSignature

public String computePowerAuthSignature(byte[] data,
                                        List<SecretKey> signatureKeys,
                                        long counter)

Compute PowerAuth 2.0 signature for given data using a secret signature keys and counter.

Parameters:

data - Data to be signed.

signatureKeys - Keys for computing the signature.

counter - Counter / derived key index.

Returns:

PowerAuth 2.0 signature for given data.

validatePowerAuthSignature

public boolean validatePowerAuthSignature(byte[] data,
                                          String signature,
                                          List<SecretKey> signatureKeys,
                                          long counter)
                                   throws InvalidKeyException

Validate the PowerAuth 2.0 signature for given data using provided keys.

Parameters:

data - Data that were signed.

signature - Data signature.

signatureKeys - Keys for signature validation.

counter - Counter.

Returns:

Return "true" if signature matches, "false" otherwise.

Throws:

InvalidKeyException - In case invalid key is provided.