com.safenetinc.luna.provider.cipher

Class LunaRSAOAEPEncoder

java.lang.Object

com.safenetinc.luna.provider.cipher.LunaRSAOAEPEncoder

public class LunaRSAOAEPEncoder
extends java.lang.Object

Class introduced to perform RSA OAEP encoding/decoding in software as part of HAPP-103. The implementation follows http://nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.800-56Br1.pdf

Constructor Summary

Constructors

Constructor and Description
LunaRSAOAEPEncoder()

Method Summary

Methods

Modifier and Type	Method and Description
static byte[]	decodeOAEP(byte[] encodedMessage, int encodedMessageOffset, int encodedMessageLength, int keySize, byte[] encodedParams) Decodes encodedMessage using RSA OAEP decoding and returns message.
static byte[]	encodeOAEP(byte[] message, int messageOffset, int messageLength, int keySizeBytes, byte[] encodedParams, byte[] seed) Encodes a message using RSA OAEP Padding.
static java.security.MessageDigest	getMessageDigestFromParams(byte[] encodedParams) Gets appropriate MessageDigest by reading the hashing algorithm by decoding the encodedParams that come from LunaParametersOAEP.engineGetEncoded()}.
static byte[]	getSourceDataFromParams(byte[] encodedParams) Gets encoded source data by decoding the encodedParams that come from LunaParametersOAEP.engineGetEncoded()}.
static byte[]	mgf(byte[] seed, int seedOffset, int seedLength, int expectedLength, java.security.MessageDigest digest) Performs The Mask Generation Function (MGF) to create a mask using specified seed.

Methods inherited from class java.lang.Object

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

Constructor Detail

LunaRSAOAEPEncoder

public LunaRSAOAEPEncoder()

Method Detail

mgf

public static byte[] mgf(byte[] seed,
         int seedOffset,
         int seedLength,
         int expectedLength,
         java.security.MessageDigest digest)

Performs The Mask Generation Function (MGF) to create a mask using specified seed.

Parameters:

seed - The seed to use for the MGF

seedOffset - The offset into the seed byte array

seedLength - The length in bytes of the seed

expectedLength - The expected length of the returned mask

digest - The MessageDigest to use for the Hash function

Returns:

The mask

getMessageDigestFromParams

public static java.security.MessageDigest getMessageDigestFromParams(byte[] encodedParams)

Gets appropriate MessageDigest by reading the hashing algorithm by decoding the encodedParams that come from LunaParametersOAEP.engineGetEncoded()}.

Parameters:

encodedParams - the encodedParams to decode

Returns:

The MessageDigest

getSourceDataFromParams

public static byte[] getSourceDataFromParams(byte[] encodedParams)

Gets encoded source data by decoding the encodedParams that come from LunaParametersOAEP.engineGetEncoded()}.

Parameters:

encodedParams - the encodedParams to decode

Returns:

byte array of the source data

encodeOAEP

public static byte[] encodeOAEP(byte[] message,
                int messageOffset,
                int messageLength,
                int keySizeBytes,
                byte[] encodedParams,
                byte[] seed)

Encodes a message using RSA OAEP Padding.

Parameters:

message - The message to encode

messageOffset - Offset index of the message byte array

messageLength - The length of the message. Must be <= keySizeBytes - 2 * hLen - 2 where hLen is the length in bytes of hashes from the Hashing algorithm.

keySizeBytes - The size in bytes of the the RSA key

encodedParams - The encoded params that come from LunaParametersOAEP.engineGetEncoded()}

seed - The seed to use for the algorithm. If null or the length of the seed doesn't match hLen, seed is generated.

Returns:

The RSA OAEP encoded message

decodeOAEP

public static byte[] decodeOAEP(byte[] encodedMessage,
                int encodedMessageOffset,
                int encodedMessageLength,
                int keySize,
                byte[] encodedParams)

Decodes encodedMessage using RSA OAEP decoding and returns message.

Parameters:

encodedMessage - the encodedMessage to decode

encodedMessageOffset - the offset into the encodedMessage

encodedMessageLength - the length of the encodedMessage

keySize - the key size in bytes

encodedParams - The encoded params that come from LunaParametersOAEP.engineGetEncoded()}

Returns:

the decoded message