Package io.getlime.security.powerauth.crypto.client.signature

Class PowerAuthClientSignature

java.lang.Object

io.getlime.security.powerauth.crypto.client.signature.PowerAuthClientSignature

public class PowerAuthClientSignature
extends Object

Class implementing client-side signature related processes.

Author:

Petr Dvorak

Constructor Summary

Constructors

Constructor	Description
PowerAuthClientSignature()

Method Summary

Modifier and Type	Method	Description
String	signatureForData(byte[] data, List<SecretKey> signatureKeys, byte[] ctrData, SignatureConfiguration signatureConfiguration)	Compute a PowerAuth signature for given data, signature keys and counter.

Methods inherited from class java.lang.Object

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

Constructor Details

PowerAuthClientSignature

public PowerAuthClientSignature()

Method Details

signatureForData

public String signatureForData(byte[] data,
 List<SecretKey> signatureKeys,
 byte[] ctrData,
 SignatureConfiguration signatureConfiguration)
                        throws GenericCryptoException,
CryptoProviderException

Compute a PowerAuth signature for given data, signature keys and counter. Signature keys are symmetric keys deduced using private device key KEY_DEVICE_PRIVATE and server public key KEY_SERVER_PUBLIC, and then using KDF function with proper index. See PowerAuth protocol specification for details.

Parameters:

data - Data to be signed.

signatureKeys - A signature keys.

ctrData - Hash based counter / index of the derived key KEY_DERIVED.

signatureConfiguration - Format and parameters of signature to calculate.

Returns:

PowerAuth signature for given data.

Throws:

GenericCryptoException - In case signature computation fails.

CryptoProviderException - In case cryptography provider is incorrectly initialized.