| /* |
| * Copyright (c) 2003, 2016, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package sun.security.rsa; |
| |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| |
| import java.security.*; |
| import java.security.interfaces.*; |
| |
| import sun.security.util.*; |
| import sun.security.x509.AlgorithmId; |
| |
| /** |
| * PKCS#1 RSA signatures with the various message digest algorithms. |
| * This file contains an abstract base class with all the logic plus |
| * a nested static class for each of the message digest algorithms |
| * (see end of the file). We support MD2, MD5, SHA-1, SHA-224, SHA-256, |
| * SHA-384, and SHA-512. |
| * |
| * @since 1.5 |
| * @author Andreas Sterbenz |
| */ |
| public abstract class RSASignature extends SignatureSpi { |
| |
| // we sign an ASN.1 SEQUENCE of AlgorithmId and digest |
| // it has the form 30:xx:30:xx:[digestOID]:05:00:04:xx:[digest] |
| // this means the encoded length is (8 + digestOID.length + digest.length) |
| private static final int baseLength = 8; |
| |
| // object identifier for the message digest algorithm used |
| private final ObjectIdentifier digestOID; |
| |
| // length of the encoded signature blob |
| private final int encodedLength; |
| |
| // message digest implementation we use |
| private final MessageDigest md; |
| // flag indicating whether the digest is reset |
| private boolean digestReset; |
| |
| // private key, if initialized for signing |
| private RSAPrivateKey privateKey; |
| // public key, if initialized for verifying |
| private RSAPublicKey publicKey; |
| |
| // padding to use, set when the initSign/initVerify is called |
| private RSAPadding padding; |
| |
| /** |
| * Construct a new RSASignature. Used by subclasses. |
| */ |
| RSASignature(String algorithm, ObjectIdentifier digestOID, int oidLength) { |
| this.digestOID = digestOID; |
| try { |
| md = MessageDigest.getInstance(algorithm); |
| } catch (NoSuchAlgorithmException e) { |
| throw new ProviderException(e); |
| } |
| digestReset = true; |
| encodedLength = baseLength + oidLength + md.getDigestLength(); |
| } |
| |
| // initialize for verification. See JCA doc |
| protected void engineInitVerify(PublicKey publicKey) |
| throws InvalidKeyException { |
| RSAPublicKey rsaKey = (RSAPublicKey)RSAKeyFactory.toRSAKey(publicKey); |
| this.privateKey = null; |
| this.publicKey = rsaKey; |
| initCommon(rsaKey, null); |
| } |
| |
| // initialize for signing. See JCA doc |
| protected void engineInitSign(PrivateKey privateKey) |
| throws InvalidKeyException { |
| engineInitSign(privateKey, null); |
| } |
| |
| // initialize for signing. See JCA doc |
| protected void engineInitSign(PrivateKey privateKey, SecureRandom random) |
| throws InvalidKeyException { |
| RSAPrivateKey rsaKey = |
| (RSAPrivateKey)RSAKeyFactory.toRSAKey(privateKey); |
| this.privateKey = rsaKey; |
| this.publicKey = null; |
| initCommon(rsaKey, random); |
| } |
| |
| /** |
| * Init code common to sign and verify. |
| */ |
| private void initCommon(RSAKey rsaKey, SecureRandom random) |
| throws InvalidKeyException { |
| resetDigest(); |
| int keySize = RSACore.getByteLength(rsaKey); |
| try { |
| padding = RSAPadding.getInstance |
| (RSAPadding.PAD_BLOCKTYPE_1, keySize, random); |
| } catch (InvalidAlgorithmParameterException iape) { |
| throw new InvalidKeyException(iape.getMessage()); |
| } |
| int maxDataSize = padding.getMaxDataSize(); |
| if (encodedLength > maxDataSize) { |
| throw new InvalidKeyException |
| ("Key is too short for this signature algorithm"); |
| } |
| } |
| |
| /** |
| * Reset the message digest if it is not already reset. |
| */ |
| private void resetDigest() { |
| if (digestReset == false) { |
| md.reset(); |
| digestReset = true; |
| } |
| } |
| |
| /** |
| * Return the message digest value. |
| */ |
| private byte[] getDigestValue() { |
| digestReset = true; |
| return md.digest(); |
| } |
| |
| // update the signature with the plaintext data. See JCA doc |
| protected void engineUpdate(byte b) throws SignatureException { |
| md.update(b); |
| digestReset = false; |
| } |
| |
| // update the signature with the plaintext data. See JCA doc |
| protected void engineUpdate(byte[] b, int off, int len) |
| throws SignatureException { |
| md.update(b, off, len); |
| digestReset = false; |
| } |
| |
| // update the signature with the plaintext data. See JCA doc |
| protected void engineUpdate(ByteBuffer b) { |
| md.update(b); |
| digestReset = false; |
| } |
| |
| // sign the data and return the signature. See JCA doc |
| protected byte[] engineSign() throws SignatureException { |
| byte[] digest = getDigestValue(); |
| try { |
| byte[] encoded = encodeSignature(digestOID, digest); |
| byte[] padded = padding.pad(encoded); |
| byte[] encrypted = RSACore.rsa(padded, privateKey, true); |
| return encrypted; |
| } catch (GeneralSecurityException e) { |
| throw new SignatureException("Could not sign data", e); |
| } catch (IOException e) { |
| throw new SignatureException("Could not encode data", e); |
| } |
| } |
| |
| // verify the data and return the result. See JCA doc |
| // should be reset to the state after engineInitVerify call. |
| protected boolean engineVerify(byte[] sigBytes) throws SignatureException { |
| try { |
| if (sigBytes.length != RSACore.getByteLength(publicKey)) { |
| throw new SignatureException("Signature length not correct: got " + |
| sigBytes.length + " but was expecting " + |
| RSACore.getByteLength(publicKey)); |
| } |
| byte[] digest = getDigestValue(); |
| byte[] decrypted = RSACore.rsa(sigBytes, publicKey); |
| byte[] unpadded = padding.unpad(decrypted); |
| byte[] decodedDigest = decodeSignature(digestOID, unpadded); |
| return MessageDigest.isEqual(digest, decodedDigest); |
| } catch (javax.crypto.BadPaddingException e) { |
| // occurs if the app has used the wrong RSA public key |
| // or if sigBytes is invalid |
| // return false rather than propagating the exception for |
| // compatibility/ease of use |
| return false; |
| } catch (IOException e) { |
| throw new SignatureException("Signature encoding error", e); |
| } finally { |
| resetDigest(); |
| } |
| } |
| |
| /** |
| * Encode the digest, return the to-be-signed data. |
| * Also used by the PKCS#11 provider. |
| */ |
| public static byte[] encodeSignature(ObjectIdentifier oid, byte[] digest) |
| throws IOException { |
| DerOutputStream out = new DerOutputStream(); |
| new AlgorithmId(oid).encode(out); |
| out.putOctetString(digest); |
| DerValue result = |
| new DerValue(DerValue.tag_Sequence, out.toByteArray()); |
| return result.toByteArray(); |
| } |
| |
| /** |
| * Decode the signature data. Verify that the object identifier matches |
| * and return the message digest. |
| */ |
| public static byte[] decodeSignature(ObjectIdentifier oid, byte[] sig) |
| throws IOException { |
| // Enforce strict DER checking for signatures |
| DerInputStream in = new DerInputStream(sig, 0, sig.length, false); |
| DerValue[] values = in.getSequence(2); |
| if ((values.length != 2) || (in.available() != 0)) { |
| throw new IOException("SEQUENCE length error"); |
| } |
| AlgorithmId algId = AlgorithmId.parse(values[0]); |
| if (algId.getOID().equals(oid) == false) { |
| throw new IOException("ObjectIdentifier mismatch: " |
| + algId.getOID()); |
| } |
| if (algId.getEncodedParams() != null) { |
| throw new IOException("Unexpected AlgorithmId parameters"); |
| } |
| byte[] digest = values[1].getOctetString(); |
| return digest; |
| } |
| |
| // set parameter, not supported. See JCA doc |
| @Deprecated |
| protected void engineSetParameter(String param, Object value) |
| throws InvalidParameterException { |
| throw new UnsupportedOperationException("setParameter() not supported"); |
| } |
| |
| // get parameter, not supported. See JCA doc |
| @Deprecated |
| protected Object engineGetParameter(String param) |
| throws InvalidParameterException { |
| throw new UnsupportedOperationException("getParameter() not supported"); |
| } |
| |
| // Nested class for MD2withRSA signatures |
| public static final class MD2withRSA extends RSASignature { |
| public MD2withRSA() { |
| super("MD2", AlgorithmId.MD2_oid, 10); |
| } |
| } |
| |
| // Nested class for MD5withRSA signatures |
| public static final class MD5withRSA extends RSASignature { |
| public MD5withRSA() { |
| super("MD5", AlgorithmId.MD5_oid, 10); |
| } |
| } |
| |
| // Nested class for SHA1withRSA signatures |
| public static final class SHA1withRSA extends RSASignature { |
| public SHA1withRSA() { |
| super("SHA-1", AlgorithmId.SHA_oid, 7); |
| } |
| } |
| |
| // Nested class for SHA224withRSA signatures |
| public static final class SHA224withRSA extends RSASignature { |
| public SHA224withRSA() { |
| super("SHA-224", AlgorithmId.SHA224_oid, 11); |
| } |
| } |
| |
| // Nested class for SHA256withRSA signatures |
| public static final class SHA256withRSA extends RSASignature { |
| public SHA256withRSA() { |
| super("SHA-256", AlgorithmId.SHA256_oid, 11); |
| } |
| } |
| |
| // Nested class for SHA384withRSA signatures |
| public static final class SHA384withRSA extends RSASignature { |
| public SHA384withRSA() { |
| super("SHA-384", AlgorithmId.SHA384_oid, 11); |
| } |
| } |
| |
| // Nested class for SHA512withRSA signatures |
| public static final class SHA512withRSA extends RSASignature { |
| public SHA512withRSA() { |
| super("SHA-512", AlgorithmId.SHA512_oid, 11); |
| } |
| } |
| |
| } |