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package cz.crcs.ectester.applet;
import javacard.framework.CardRuntimeException;
import javacard.framework.ISO7816;
import javacard.security.*;
/**
* Class capable of testing ECDH/C and ECDSA.
* Note that ECDH and ECDHC output should equal, only the algorithm is different.
*
* @author Jan Jancar johny@neuromancer.sk
*/
public class ECKeyTester {
private KeyAgreement ecKeyAgreement = null;
private short kaType = 0;
private Signature ecdsaSignature = null;
private short sigType = 0;
private short sw = ISO7816.SW_NO_ERROR;
public short allocateKA(byte algorithm) {
sw = ISO7816.SW_NO_ERROR;
try {
ecKeyAgreement = KeyAgreement.getInstance(algorithm, false);
kaType = algorithm;
} catch (CardRuntimeException ce) {
sw = ce.getReason();
}
return sw;
}
public short allocateSig(byte algorithm) {
sw = ISO7816.SW_NO_ERROR;
try {
ecdsaSignature = Signature.getInstance(algorithm, false);
sigType = algorithm;
} catch (CardRuntimeException ce) {
sw = ce.getReason();
}
return sw;
}
/**
* Tests ECDH secret generation with keys from given {@code privatePair} and {@code publicPair}.
* Uses {@code pubkeyBuffer} at {@code pubkeyOffset} for computations.
* Output should equal with ECDHC output.
*
* @param privatePair KeyPair from which the private key is used
* @param publicPair KeyPair from which the public key is used
* @param pubkeyBuffer buffer to be used for the public key
* @param pubkeyOffset offset into pubkeyBuffer that can be used for the public key
* @param outputBuffer buffer to be used for the secret output
* @param outputOffset offset into the outputBuffer
* @param corruption (EC_Consts.CORRUPTION_* | ...)
* @return derived secret length
**/
public short testKA(KeyPair privatePair, KeyPair publicPair, byte[] pubkeyBuffer, short pubkeyOffset, byte[] outputBuffer, short outputOffset, short corruption) {
short length = 0;
try {
sw = AppletUtil.kaCheck(ecKeyAgreement);
sw = AppletUtil.keypairCheck(privatePair);
sw = AppletUtil.keypairCheck(publicPair);
short pubkeyLength = ((ECPublicKey) publicPair.getPublic()).getW(pubkeyBuffer, pubkeyOffset);
// reached ok
ecKeyAgreement.init(privatePair.getPrivate()); // throws UNITIALIZED KEY when ALG_EC_SVDP_DHC_PLAIN is used
//ISOException.throwIt((short) 0x666);
pubkeyLength = EC_Consts.corruptParameter(corruption, pubkeyBuffer, pubkeyOffset, pubkeyLength);
length = ecKeyAgreement.generateSecret(pubkeyBuffer, pubkeyOffset, pubkeyLength, outputBuffer, outputOffset);
} catch (CardRuntimeException ce) {
sw = ce.getReason();
}
return length;
}
/**
* @param privatePair
* @param pubkey
* @param pubkeyOffset
* @param pubkeyLength
* @param outpuBuffer
* @param outputOffset
* @param corruption
* @return
*/
public short testKA_direct(KeyPair privatePair, byte[] pubkey, short pubkeyOffset, short pubkeyLength, byte[] outpuBuffer, short outputOffset, short corruption) {
short length = 0;
try {
sw = AppletUtil.kaCheck(ecKeyAgreement);
sw = AppletUtil.keypairCheck(privatePair);
ecKeyAgreement.init(privatePair.getPrivate());
pubkeyLength = EC_Consts.corruptParameter(corruption, pubkey, pubkeyOffset, pubkeyLength);
length = ecKeyAgreement.generateSecret(pubkey, pubkeyOffset, pubkeyLength, outpuBuffer, outputOffset);
} catch (CardRuntimeException ce) {
sw = ce.getReason();
}
return length;
}
/**
* Uses {@code signKey} to sign data from {@code inputBuffer} at {@code inputOffset} with {@code inputOffset}.
* Then checks for correct signature length.
* Then tries verifying the data with {@code verifyKey}.
*
* @param signKey key to use for signing
* @param verifyKey key to use for verifying the signature
* @param inputBuffer buffer to sign data from
* @param inputOffset offset into inputBuffer to sign data from
* @param inputLength length of data to sign
* @param sigBuffer buffer to output signature to
* @param sigOffset offset into sigBuffer to output to
* @return signature length
*/
public short testECDSA(ECPrivateKey signKey, ECPublicKey verifyKey, byte[] inputBuffer, short inputOffset, short inputLength, byte[] sigBuffer, short sigOffset) {
short length = 0;
try {
sw = AppletUtil.signCheck(ecdsaSignature);
ecdsaSignature.init(signKey, Signature.MODE_SIGN);
length = ecdsaSignature.sign(inputBuffer, inputOffset, inputLength, sigBuffer, sigOffset);
ecdsaSignature.init(verifyKey, Signature.MODE_VERIFY);
boolean correct = ecdsaSignature.verify(inputBuffer, inputOffset, inputLength, sigBuffer, sigOffset, length);
if (!correct) {
sw = ECTesterApplet.SW_SIG_VERIFY_FAIL;
}
} catch (CardRuntimeException ce) {
sw = ce.getReason();
}
return length;
}
public KeyAgreement getKA() {
return ecKeyAgreement;
}
public Signature getSig() {
return ecdsaSignature;
}
public boolean hasKA() {
return ecKeyAgreement != null;
}
public boolean hasSig() {
return ecdsaSignature != null;
}
public short getKaType() {
return kaType;
}
public short getSigType() {
return sigType;
}
public short getSW() {
return sw;
}
}
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