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package applets;
import javacard.framework.ISO7816;
import javacard.framework.Util;
import javacard.security.CryptoException;
import javacard.security.ECPrivateKey;
import javacard.security.ECPublicKey;
import javacard.security.KeyPair;
/**
*
*/
public class ECKeyGenerator {
private KeyPair ecKeyPair = null;
private ECPrivateKey ecPrivateKey = null;
private ECPublicKey ecPublicKey = null;
public static final byte KEY_PUBLIC = 0x1;
public static final byte KEY_PRIVATE = 0x2;
public static final byte KEY_BOTH = KEY_PUBLIC & KEY_PRIVATE;
public short allocatePair(byte algorithm, short keyLength) {
short result = ISO7816.SW_NO_ERROR;
try {
ecKeyPair = new KeyPair(algorithm, keyLength);
ecPrivateKey = (ECPrivateKey) ecKeyPair.getPrivate();
ecPublicKey = (ECPublicKey) ecKeyPair.getPublic();
} catch (CryptoException ce) {
result = ce.getReason();
} catch (Exception e) {
result = ISO7816.SW_UNKNOWN;
}
return result;
}
public boolean isAllocated() {
return ecKeyPair != null && ecPrivateKey != null && ecPublicKey != null;
}
public short generatePair() {
short result = ISO7816.SW_NO_ERROR;
try {
ecKeyPair.genKeyPair();
ecPrivateKey = (ECPrivateKey) ecKeyPair.getPrivate();
ecPublicKey = (ECPublicKey) ecKeyPair.getPublic();
} catch (CryptoException ce) {
result = ce.getReason();
} catch (Exception e) {
result = ISO7816.SW_UNKNOWN;
}
return result;
}
public short setCustomCurve(byte keyClass, short keyLength, byte[] buffer, short offset) {
return setCustomCurve(EC_Consts.getCurve(keyClass, keyLength), buffer, offset);
}
public short setCustomCurve(byte curve, byte[] buffer, short offset) {
byte alg = EC_Consts.getCurveType(curve);
short sw = ISO7816.SW_NO_ERROR;
short length;
if (alg == KeyPair.ALG_EC_FP) {
length = EC_Consts.getCurveParameter(curve, EC_Consts.PARAMETER_FP, buffer, offset);
sw = setExternalParameter(KEY_BOTH, EC_Consts.PARAMETER_FP, buffer, offset, length);
} else if (alg == KeyPair.ALG_EC_F2M) {
length = EC_Consts.getCurveParameter(curve, EC_Consts.PARAMETER_F2M, buffer, offset);
sw = setExternalParameter(KEY_BOTH, EC_Consts.PARAMETER_F2M, buffer, offset, length);
}
if (sw != ISO7816.SW_NO_ERROR) return sw;
//go through all params
for (byte param = EC_Consts.PARAMETER_A; param <= EC_Consts.PARAMETER_K; param = (byte)(param << 1)) {
length = EC_Consts.getCurveParameter(curve, param, buffer, offset);
sw = setExternalParameter(KEY_BOTH, param, buffer, offset, length);
if (sw != ISO7816.SW_NO_ERROR) break;
}
return sw;
}
public short setCustomInvalidCurve(short keyClass, short keyLength, byte key, byte param, short corruptionType, byte[] buffer, short offset) {
return setCustomInvalidCurve(EC_Consts.getCurve(keyClass, keyLength), key, param, corruptionType, buffer, offset);
}
public short setCustomInvalidCurve(byte curve, byte key, byte param, short corruptionType, byte[] buffer, short offset) {
short sw = setCustomCurve(curve, buffer, offset);
if (sw != ISO7816.SW_NO_ERROR) return sw;
//go through param bit by bit, and invalidate all selected params
byte paramMask = 0x01;
while (paramMask <= EC_Consts.PARAMETER_K) {
byte masked = (byte)(paramMask & param);
if (masked != 0){
short length = EC_Consts.getCorruptCurveParameter(curve, masked, buffer, offset, corruptionType);
sw = setExternalParameter(key, masked, buffer, offset, length);
if (sw != ISO7816.SW_NO_ERROR) return sw;
}
paramMask = (byte)(paramMask << 1);
}
return sw;
}
public short setExternalParameter(byte key, byte param, byte[] data, short offset, short length) {
short result = ISO7816.SW_NO_ERROR;
try {
switch (param) {
case EC_Consts.PARAMETER_FP:
if ((key & KEY_PRIVATE) != 0) ecPrivateKey.setFieldFP(data, offset, length);
if ((key & KEY_PUBLIC) != 0) ecPublicKey.setFieldFP(data, offset, length);
break;
case EC_Consts.PARAMETER_F2M:
if (length == 2) {
short i = Util.makeShort(data[offset], data[(short) (offset + 1)]);
if ((key & KEY_PRIVATE) != 0) ecPrivateKey.setFieldF2M(i);
if ((key & KEY_PUBLIC) != 0) ecPublicKey.setFieldF2M(i);
} else if (length == 6) {
short i1 = Util.makeShort(data[offset], data[(short) (offset + 1)]);
short i2 = Util.makeShort(data[(short) (offset + 2)], data[(short) (offset + 3)]);
short i3 = Util.makeShort(data[(short) (offset + 4)], data[(short) (offset + 5)]);
if ((key & KEY_PRIVATE) != 0) ecPrivateKey.setFieldF2M(i1, i2, i3);
if ((key & KEY_PUBLIC) != 0) ecPublicKey.setFieldF2M(i1, i2, i3);
} else {
result = ISO7816.SW_UNKNOWN;
}
break;
case EC_Consts.PARAMETER_A:
if ((key & KEY_PRIVATE) != 0) ecPrivateKey.setA(data, offset, length);
if ((key & KEY_PUBLIC) != 0) ecPublicKey.setA(data, offset, length);
break;
case EC_Consts.PARAMETER_B:
if ((key & KEY_PRIVATE) != 0) ecPrivateKey.setB(data, offset, length);
if ((key & KEY_PUBLIC) != 0) ecPublicKey.setB(data, offset, length);
break;
case EC_Consts.PARAMETER_G:
if ((key & KEY_PRIVATE) != 0) ecPrivateKey.setG(data, offset, length);
if ((key & KEY_PUBLIC) != 0) ecPublicKey.setG(data, offset, length);
break;
case EC_Consts.PARAMETER_R:
if ((key & KEY_PRIVATE) != 0) ecPrivateKey.setR(data, offset, length);
if ((key & KEY_PUBLIC) != 0) ecPublicKey.setR(data, offset, length);
break;
case EC_Consts.PARAMETER_K:
if (length != 2) {
result = ISO7816.SW_UNKNOWN;
} else {
short k = Util.makeShort(data[offset], data[(short) (offset + 1)]);
if ((key & KEY_PRIVATE) != 0) ecPrivateKey.setK(k);
if ((key & KEY_PUBLIC) != 0) ecPublicKey.setK(k);
}
break;
default:
result = ISO7816.SW_UNKNOWN;
}
} catch (CryptoException ce) {
result = ce.getReason();
} catch (Exception e) {
result = ISO7816.SW_UNKNOWN;
}
return result;
}
public short setExternalCurve(byte key, byte keyClass, byte[] buffer, short offset, short fieldLength, short aLength, short bLength, short gxLength, short gyLength, short rLength){
short sw = ISO7816.SW_NO_ERROR;
if (keyClass == KeyPair.ALG_EC_FP) {
sw = setExternalParameter(key, EC_Consts.PARAMETER_FP, buffer, offset, fieldLength);
} else if (keyClass == KeyPair.ALG_EC_F2M) {
sw = setExternalParameter(key, EC_Consts.PARAMETER_F2M, buffer, offset, fieldLength);
}
if (sw != ISO7816.SW_NO_ERROR) return sw;
offset += fieldLength;
//go through all params
sw = setExternalParameter(key, EC_Consts.PARAMETER_A, buffer, offset, aLength);
if (sw != ISO7816.SW_NO_ERROR) return sw;
offset += aLength;
sw = setExternalParameter(key, EC_Consts.PARAMETER_B, buffer, offset, bLength);
if (sw != ISO7816.SW_NO_ERROR) return sw;
offset += bLength;
sw = setExternalParameter(key, EC_Consts.PARAMETER_G, buffer, offset, (short) (gxLength + gyLength));
if (sw != ISO7816.SW_NO_ERROR) return sw;
offset += gxLength + gyLength;
sw = setExternalParameter(key, EC_Consts.PARAMETER_R, buffer, offset, aLength);
if (sw != ISO7816.SW_NO_ERROR) return sw;
offset += rLength;
sw = setExternalParameter(key, EC_Consts.PARAMETER_K, buffer, offset, (short) 2);
return sw;
}
public short exportParameter(byte key, short param, byte[] outputBuffer, short outputOffset) {
if (key == KEY_BOTH) {
return -1;
}//TODO: change error handling.
short length = 0;
try {
switch (param) {
case EC_Consts.PARAMETER_FP:
case EC_Consts.PARAMETER_F2M:
if ((key & KEY_PUBLIC) != 0) length = ecPublicKey.getField(outputBuffer, outputOffset);
if ((key & KEY_PRIVATE) != 0) length = ecPrivateKey.getField(outputBuffer, outputOffset);
break;
case EC_Consts.PARAMETER_A:
if ((key & KEY_PUBLIC) != 0) length = ecPublicKey.getA(outputBuffer, outputOffset);
if ((key & KEY_PRIVATE) != 0) length = ecPrivateKey.getA(outputBuffer, outputOffset);
break;
case EC_Consts.PARAMETER_B:
if ((key & KEY_PUBLIC) != 0) length = ecPublicKey.getB(outputBuffer, outputOffset);
if ((key & KEY_PRIVATE) != 0) length = ecPrivateKey.getB(outputBuffer, outputOffset);
break;
case EC_Consts.PARAMETER_G:
if ((key & KEY_PUBLIC) != 0) length = ecPublicKey.getG(outputBuffer, outputOffset);
if ((key & KEY_PRIVATE) != 0) length = ecPrivateKey.getG(outputBuffer, outputOffset);
break;
case EC_Consts.PARAMETER_R:
if ((key & KEY_PUBLIC) != 0) length = ecPublicKey.getR(outputBuffer, outputOffset);
if ((key & KEY_PRIVATE) != 0) length = ecPrivateKey.getR(outputBuffer, outputOffset);
break;
case EC_Consts.PARAMETER_K:
if ((key & KEY_PUBLIC) != 0) Util.setShort(outputBuffer, outputOffset, ecPublicKey.getK());
if ((key & KEY_PRIVATE) != 0) Util.setShort(outputBuffer, outputOffset, ecPrivateKey.getK());
length = 2;
break;
default:
length = -1;
}
} catch (CryptoException ce) {
length = -1;
} catch (Exception e) {
length = -1;
}
return length;
}
public ECPrivateKey getPrivateKey() {
return ecPrivateKey;
}
public ECPublicKey getPublicKey() {
return ecPublicKey;
}
public KeyPair getKeyPair() {
return ecKeyPair;
}
}
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