void init() throws KeyczarException {
BigInteger yVal = new BigInteger(Base64Coder.decodeWebSafe(y));
BigInteger pVal = new BigInteger(Base64Coder.decodeWebSafe(p));
BigInteger qVal = new BigInteger(Base64Coder.decodeWebSafe(q));
BigInteger gVal = new BigInteger(Base64Coder.decodeWebSafe(g));
DSAPublicKeySpec spec = new DSAPublicKeySpec(yVal, pVal, qVal, gVal);
try {
KeyFactory kf = KeyFactory.getInstance(KEY_GEN_ALGORITHM);
jcePublicKey = kf.generatePublic(spec);
} catch (GeneralSecurityException e) {
throw new KeyczarException(e);
}
byte[] fullHash =
Util.prefixHash(
Util.stripLeadingZeros(pVal.toByteArray()),
Util.stripLeadingZeros(qVal.toByteArray()),
Util.stripLeadingZeros(gVal.toByteArray()),
Util.stripLeadingZeros(yVal.toByteArray()));
System.arraycopy(fullHash, 0, hash, 0, hash.length);
}
