/** Construct a key from its components. Used by the KeyFactory. */
ECPrivateKeyImpl(BigInteger s, ECParameterSpec params) throws InvalidKeyException {
this.s = s;
this.params = params;
// generate the encoding
algid = new AlgorithmId(AlgorithmId.EC_oid, ECParameters.getAlgorithmParameters(params));
try {
DerOutputStream out = new DerOutputStream();
out.putInteger(1); // version 1
byte[] privBytes = ECUtil.trimZeroes(s.toByteArray());
out.putOctetString(privBytes);
DerValue val = new DerValue(DerValue.tag_Sequence, out.toByteArray());
key = val.toByteArray();
} catch (IOException exc) {
// should never occur
throw new InvalidKeyException(exc);
}
}
/** Parse the key. Called by PKCS8Key. */
protected void parseKeyBits() throws InvalidKeyException {
try {
DerInputStream in = new DerInputStream(key);
DerValue derValue = in.getDerValue();
if (derValue.tag != DerValue.tag_Sequence) {
throw new IOException("Not a SEQUENCE");
}
DerInputStream data = derValue.data;
int version = data.getInteger();
if (version != 1) {
throw new IOException("Version must be 1");
}
byte[] privData = data.getOctetString();
s = new BigInteger(1, privData);
while (data.available() != 0) {
DerValue value = data.getDerValue();
if (value.isContextSpecific((byte) 0)) {
// ignore for now
} else if (value.isContextSpecific((byte) 1)) {
// ignore for now
} else {
throw new InvalidKeyException("Unexpected value: " + value);
}
}
AlgorithmParameters algParams = this.algid.getParameters();
if (algParams == null) {
throw new InvalidKeyException(
"EC domain parameters must be " + "encoded in the algorithm identifier");
}
params = algParams.getParameterSpec(ECParameterSpec.class);
} catch (IOException e) {
throw new InvalidKeyException("Invalid EC private key", e);
} catch (InvalidParameterSpecException e) {
throw new InvalidKeyException("Invalid EC private key", e);
}
}