/** 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 != 0) {
throw new IOException("Version must be 0");
}
n = getBigInteger(data);
e = getBigInteger(data);
d = getBigInteger(data);
p = getBigInteger(data);
q = getBigInteger(data);
pe = getBigInteger(data);
qe = getBigInteger(data);
coeff = getBigInteger(data);
if (derValue.data.available() != 0) {
throw new IOException("Extra data available");
}
} catch (IOException e) {
throw new InvalidKeyException("Invalid RSA private key", e);
}
}
/** Read a BigInteger from the DerInputStream. */
static BigInteger getBigInteger(DerInputStream data) throws IOException {
BigInteger b = data.getBigInteger();
/*
* Some implementations do not correctly encode ASN.1 INTEGER values
* in 2's complement format, resulting in a negative integer when
* decoded. Correct the error by converting it to a positive integer.
*
* See CR 6255949
*/
if (b.signum() < 0) {
b = new BigInteger(1, b.toByteArray());
}
return b;
}