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package cz.crcs.ectester.applet;
import javacard.framework.CardRuntimeException;
import javacard.framework.ISO7816;
import javacard.framework.Util;
import javacard.security.ECPrivateKey;
import javacard.security.ECPublicKey;
import javacard.security.KeyAgreement;
import javacard.security.Signature;
/**
* 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 ecdhKeyAgreement = null;
private KeyAgreement ecdhcKeyAgreement = null;
private Signature ecdsaSignature = null;
private short sw = ISO7816.SW_NO_ERROR;
public short allocateECDH() {
sw = ISO7816.SW_NO_ERROR;
try {
ecdhKeyAgreement = KeyAgreement.getInstance(KeyAgreement.ALG_EC_SVDP_DH, false);
} catch (CardRuntimeException ce) {
sw = ce.getReason();
}
return sw;
}
public short allocateECDHC() {
sw = ISO7816.SW_NO_ERROR;
try {
ecdhcKeyAgreement = KeyAgreement.getInstance(KeyAgreement.ALG_EC_SVDP_DHC, false);
} catch (CardRuntimeException ce) {
sw = ce.getReason();
}
return sw;
}
public short allocateECDSA() {
sw = ISO7816.SW_NO_ERROR;
try {
ecdsaSignature = Signature.getInstance(Signature.ALG_ECDSA_SHA, false);
} catch (CardRuntimeException ce) {
sw = ce.getReason();
}
return sw;
}
private short testKA(KeyAgreement ka, ECPrivateKey privateKey, byte[] pubkeyBuffer, short pubkeyOffset, short pubkeyLength, byte[] outputBuffer, short outputOffset) {
sw = ISO7816.SW_NO_ERROR;
short length = 0;
try {
ka.init(privateKey);
length = ka.generateSecret(pubkeyBuffer, pubkeyOffset, pubkeyLength, outputBuffer, outputOffset);
} catch (CardRuntimeException ce) {
sw = ce.getReason();
}
return length;
}
/**
* Tests ECDH secret generation with given {@code privateKey} and {@code publicKey}.
* Uses {@code pubkeyBuffer} at {@code pubkeyOffset} for computations.
* Output should equal with ECDHC output.
*
* @param privateKey
* @param publicKey
* @param pubkeyBuffer
* @param pubkeyOffset
* @param outputBuffer
* @param outputOffset
* @param corruption
* @return derived secret length
**/
public short testECDH(ECPrivateKey privateKey, ECPublicKey publicKey, byte[] pubkeyBuffer, short pubkeyOffset, byte[] outputBuffer, short outputOffset, byte corruption) {
short length = publicKey.getW(pubkeyBuffer, pubkeyOffset);
length = EC_Consts.corruptParameter(corruption, pubkeyBuffer, pubkeyOffset, length);
return testKA(ecdhKeyAgreement, privateKey, pubkeyBuffer, pubkeyOffset, length, outputBuffer, outputOffset);
}
/**
* Tests ECDHC secret generation with given {@code privateKey} and {@code publicKey}.
* Uses {@code pubkeyBuffer} at {@code pubkeyOffset} for computations.
* Output should equal to ECDH output.
*
* @param privateKey
* @param publicKey
* @param pubkeyBuffer
* @param pubkeyOffset
* @param outputBuffer
* @param outputOffset
* @param corruption
* @return derived secret length
*/
public short testECDHC(ECPrivateKey privateKey, ECPublicKey publicKey, byte[] pubkeyBuffer, short pubkeyOffset, byte[] outputBuffer, short outputOffset, byte corruption) {
short length = publicKey.getW(pubkeyBuffer, pubkeyOffset);
length = EC_Consts.corruptParameter(corruption, pubkeyBuffer, pubkeyOffset, length);
return testKA(ecdhcKeyAgreement, privateKey, pubkeyBuffer, pubkeyOffset, length, outputBuffer, outputOffset);
}
/**
*
* @param privateKey
* @param publicKey
* @param pubkeyBuffer
* @param pubkeyOffset
* @param outputBuffer
* @param outputOffset
* @param corruption
* @return
*/
public short testKA(ECPrivateKey privateKey, ECPublicKey publicKey, byte[] pubkeyBuffer, short pubkeyOffset, byte[] outputBuffer, short outputOffset, byte corruption) {
short ecdhLength = testECDH(privateKey, publicKey, pubkeyBuffer, pubkeyOffset, outputBuffer, outputOffset, corruption);
if (sw != ISO7816.SW_NO_ERROR) {
return ecdhLength;
}
short ecdhcLength = testECDHC(privateKey, publicKey, pubkeyBuffer, pubkeyOffset, outputBuffer, (short) (outputOffset + ecdhLength), corruption);
short length = (short) (ecdhLength + ecdhcLength);
if (sw != ISO7816.SW_NO_ERROR) {
return length;
}
if (Util.arrayCompare(outputBuffer, outputOffset, outputBuffer, (short)(outputOffset + ecdhLength), ecdhLength) != 0) {
sw = ECTesterApplet.SW_DH_DHC_MISMATCH;
}
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
* @param verifyKey
* @param inputBuffer
* @param inputOffset
* @param inputLength
* @param sigBuffer
* @param sigOffset
* @return signature length
*/
public short testECDSA(ECPrivateKey signKey, ECPublicKey verifyKey, byte[] inputBuffer, short inputOffset, short inputLength, byte[] sigBuffer, short sigOffset) {
sw = ISO7816.SW_NO_ERROR;
short length = 0;
try {
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 getECDH() {
return ecdhKeyAgreement;
}
public KeyAgreement getECDHC() {
return ecdhcKeyAgreement;
}
public Signature getECDSA() {
return ecdsaSignature;
}
public boolean hasECDH() {
return ecdhKeyAgreement != null;
}
public boolean hasECDHC() {
return ecdhcKeyAgreement != null;
}
public boolean hasECDSA() {
return ecdsaSignature != null;
}
public short getSW() {
return sw;
}
}
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