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package applets;
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.
*/
public class ECKeyTester {
private KeyAgreement ecdhKeyAgreement = null;
private KeyAgreement ecdhcKeyAgreement = null;
private Signature ecdsaSignature = null;
public short allocateECDH() {
short result = ISO7816.SW_NO_ERROR;
try {
ecdhKeyAgreement = KeyAgreement.getInstance(KeyAgreement.ALG_EC_SVDP_DH, false);
} catch (CryptoException ce) {
result = ce.getReason();
} catch (Exception e) {
result = ISO7816.SW_UNKNOWN;
}
return result;
}
public short allocateECDHC() {
short result = ISO7816.SW_NO_ERROR;
try {
ecdhcKeyAgreement = KeyAgreement.getInstance(KeyAgreement.ALG_EC_SVDP_DHC, false);
} catch (CryptoException ce) {
result = ce.getReason();
} catch (Exception e) {
result = ISO7816.SW_UNKNOWN;
}
return result;
}
public short allocateECDSA() {
short result = ISO7816.SW_NO_ERROR;
try {
ecdsaSignature = Signature.getInstance(Signature.ALG_ECDSA_SHA, false);
} catch (CryptoException ce) {
result = ce.getReason();
} catch (Exception e) {
result = ISO7816.SW_UNKNOWN;
}
return result;
}
private short testDH(KeyAgreement ka, ECPrivateKey privateKey, byte[] pubkeyBuffer, short pubkeyOffset, short pubkeyLength, byte[] outputBuffer, short outputOffset) {
short result = ISO7816.SW_NO_ERROR;
try {
ka.init(privateKey);
short secretLength = ka.generateSecret(pubkeyBuffer, pubkeyOffset, pubkeyLength, outputBuffer, outputOffset);
//TODO, figure out how to separate the return value of this method (short) error, and return the secretLenght..
} catch (CryptoException ce) {
result = ce.getReason();
} catch (Exception e) {
result = ISO7816.SW_UNKNOWN;
}
return result;
}
private short testDH_validPoint(KeyAgreement ka, ECPrivateKey privateKey, byte[] pubkeyBuffer, short pubkeyOffset, short pubkeyLength, byte[] outputBuffer, short outputOffset) {
return testDH(ka, privateKey, pubkeyBuffer, pubkeyOffset, pubkeyLength, outputBuffer, outputOffset);
}
private short testDH_invalidPoint(KeyAgreement ka, ECPrivateKey privateKey, byte[] pubkeyBuffer, short pubkeyOffset, short pubkeyLength, byte[] outputBuffer, short outputOffset) {
pubkeyBuffer[(short)(pubkeyLength - 2)] += 0xcc;
pubkeyBuffer[(short)(pubkeyLength - 3)] += 0xcc;
short result = testDH(ka, privateKey, pubkeyBuffer, pubkeyOffset, pubkeyLength, outputBuffer, outputOffset);
pubkeyBuffer[(short)(pubkeyLength - 2)] -= 0xcc;
pubkeyBuffer[(short)(pubkeyLength - 3)] -= 0xcc;
return result;
}
/**
* 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
* @return ISO7816.SW_NO_ERROR on correct operation,
* exception reason otherwise
**/
public short testECDH_validPoint(ECPrivateKey privateKey, ECPublicKey publicKey, byte[] pubkeyBuffer, short pubkeyOffset, byte[] outputBuffer, short outputOffset) {
short length = publicKey.getW(pubkeyBuffer, pubkeyOffset);
return testDH_validPoint(ecdhKeyAgreement, privateKey, pubkeyBuffer, pubkeyOffset, length, outputBuffer, outputOffset);
}
public short testECDH_invalidPoint(ECPrivateKey privateKey, ECPublicKey publicKey, byte[] pubkeyBuffer, short pubkeyOffset, byte[] outputBuffer, short outputOffset) {
short length = publicKey.getW(pubkeyBuffer, pubkeyOffset);
return testDH_invalidPoint(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
* @return ISO7816.SW_NO_ERROR on correct operation,
* exception reason otherwise
*/
public short testECDHC_validPoint(ECPrivateKey privateKey, ECPublicKey publicKey, byte[] pubkeyBuffer, short pubkeyOffset, byte[] outputBuffer, short outputOffset) {
short length = publicKey.getW(pubkeyBuffer, pubkeyOffset);
return testDH_validPoint(ecdhcKeyAgreement, privateKey, pubkeyBuffer, pubkeyOffset, length, outputBuffer, outputOffset);
}
public short testECDHC_invalidPoint(ECPrivateKey privateKey, ECPublicKey publicKey, byte[] pubkeyBuffer, short pubkeyOffset, byte[] outputBuffer, short outputOffset) {
short length = publicKey.getW(pubkeyBuffer, pubkeyOffset);
return testDH_invalidPoint(ecdhcKeyAgreement, privateKey, pubkeyBuffer, pubkeyOffset, length, outputBuffer, outputOffset);
}
/**
* 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 ISO7816.SW_NO_ERROR on correct operation,
* SW_SIG_VERIFY_FAIL,
* SW_SIG_LENGTH_MISMATCH
*/
public short testECDSA(ECPrivateKey signKey, ECPublicKey verifyKey, byte[] inputBuffer, short inputOffset, short inputLength, byte[] sigBuffer, short sigOffset) {
short result = ISO7816.SW_NO_ERROR;
try {
ecdsaSignature.init(signKey, Signature.MODE_SIGN);
short sigLength = ecdsaSignature.sign(inputBuffer, inputOffset, inputLength, sigBuffer, sigOffset);
ecdsaSignature.init(verifyKey, Signature.MODE_VERIFY);
boolean correct = ecdsaSignature.verify(inputBuffer, inputOffset, inputLength, sigBuffer, sigOffset, sigLength);
if (!correct) {
result = SimpleECCApplet.SW_SIG_VERIFY_FAIL;
}
} catch (CryptoException ce) {
result = ce.getReason();
} catch (Exception e) {
result = ISO7816.SW_UNKNOWN;
}
return result;
}
public KeyAgreement getECDH() {
return ecdhKeyAgreement;
}
public KeyAgreement getECDHC() {
return ecdhcKeyAgreement;
}
public Signature getECDSA() {
return ecdsaSignature;
}
}
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