/**
* Static method to convert Key into an instance of RSAPublicKeyImpl or RSAPrivate(Crt)KeyImpl. If
* the key is not an RSA key or cannot be used, throw an InvalidKeyException.
*
* <p>Used by RSASignature and RSACipher.
*/
public static RSAKey toRSAKey(Key key) throws InvalidKeyException {
if ((key instanceof RSAPrivateKeyImpl)
|| (key instanceof RSAPrivateCrtKeyImpl)
|| (key instanceof RSAPublicKeyImpl)) {
return (RSAKey) key;
} else {
return (RSAKey) INSTANCE.engineTranslateKey(key);
}
}
/** Construct a key from its components. Used by the RSAKeyFactory and the RSAKeyPairGenerator. */
RSAPrivateCrtKeyImpl(
BigInteger n,
BigInteger e,
BigInteger d,
BigInteger p,
BigInteger q,
BigInteger pe,
BigInteger qe,
BigInteger coeff)
throws InvalidKeyException {
this.n = n;
this.e = e;
this.d = d;
this.p = p;
this.q = q;
this.pe = pe;
this.qe = qe;
this.coeff = coeff;
RSAKeyFactory.checkRSAProviderKeyLengths(n.bitLength(), e);
// generate the encoding
algid = rsaId;
try {
DerOutputStream out = new DerOutputStream();
out.putInteger(0); // version must be 0
out.putInteger(n);
out.putInteger(e);
out.putInteger(d);
out.putInteger(p);
out.putInteger(q);
out.putInteger(pe);
out.putInteger(qe);
out.putInteger(coeff);
DerValue val = new DerValue(DerValue.tag_Sequence, out.toByteArray());
key = val.toByteArray();
} catch (IOException exc) {
// should never occur
throw new InvalidKeyException(exc);
}
}
/** Construct a key from its encoding. Called from newKey above. */
RSAPrivateCrtKeyImpl(byte[] encoded) throws InvalidKeyException {
decode(encoded);
RSAKeyFactory.checkRSAProviderKeyLengths(n.bitLength(), e);
}