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package sun.security.rsa;

import java.io.IOException;
import java.math.BigInteger;

import java.security.*;
import java.security.spec.AlgorithmParameterSpec;
import java.security.interfaces.*;

import sun.security.util.*;
import sun.security.x509.AlgorithmId;
import sun.security.pkcs.PKCS8Key;

RSA private key implementation for "RSA", "RSASSA-PSS" algorithms in non-CRT form (modulus, private exponent only). For CRT private keys, see RSAPrivateCrtKeyImpl. We need separate classes to ensure correct behavior in instanceof checks, etc. Note: RSA keys must be at least 512 bits long
Author: Andreas Sterbenz
See Also:
Since: 1.5
/** * RSA private key implementation for "RSA", "RSASSA-PSS" algorithms in non-CRT * form (modulus, private exponent only). For CRT private keys, see * RSAPrivateCrtKeyImpl. We need separate classes to ensure correct behavior * in instanceof checks, etc. * * Note: RSA keys must be at least 512 bits long * * @see RSAPrivateCrtKeyImpl * @see RSAKeyFactory * * @since 1.5 * @author Andreas Sterbenz */
public final class RSAPrivateKeyImpl extends PKCS8Key implements RSAPrivateKey { @java.io.Serial private static final long serialVersionUID = -33106691987952810L; private final BigInteger n; // modulus private final BigInteger d; // private exponent // optional parameters associated with this RSA key // specified in the encoding of its AlgorithmId. // must be null for "RSA" keys. @SuppressWarnings("serial") // Not statically typed as Serializable private final AlgorithmParameterSpec keyParams;
Construct a key from its components. Used by the RSAKeyFactory and the RSAKeyPairGenerator.
/** * Construct a key from its components. Used by the * RSAKeyFactory and the RSAKeyPairGenerator. */
RSAPrivateKeyImpl(AlgorithmId rsaId, BigInteger n, BigInteger d) throws InvalidKeyException { RSAKeyFactory.checkRSAProviderKeyLengths(n.bitLength(), null); this.n = n; this.d = d; this.keyParams = RSAUtil.getParamSpec(rsaId); // generate the encoding algid = rsaId; try { DerOutputStream out = new DerOutputStream(); out.putInteger(0); // version must be 0 out.putInteger(n); out.putInteger(0); out.putInteger(d); out.putInteger(0); out.putInteger(0); out.putInteger(0); out.putInteger(0); out.putInteger(0); DerValue val = new DerValue(DerValue.tag_Sequence, out.toByteArray()); key = val.toByteArray(); } catch (IOException exc) { // should never occur throw new InvalidKeyException(exc); } } // see JCA doc @Override public String getAlgorithm() { return algid.getName(); } // see JCA doc @Override public BigInteger getModulus() { return n; } // see JCA doc @Override public BigInteger getPrivateExponent() { return d; } // see JCA doc @Override public AlgorithmParameterSpec getParams() { return keyParams; } // return a string representation of this key for debugging @Override public String toString() { return "Sun " + getAlgorithm() + " private key, " + n.bitLength() + " bits" + "\n params: " + keyParams + "\n modulus: " + n + "\n private exponent: " + d; } }