| /* |
| * Copyright (C) 2008 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.conscrypt; |
| |
| import java.security.InvalidKeyException; |
| import java.security.InvalidParameterException; |
| import java.security.NoSuchAlgorithmException; |
| import java.security.PrivateKey; |
| import java.security.PublicKey; |
| import java.security.SignatureException; |
| import java.security.SignatureSpi; |
| |
| /** |
| * Implements the subset of the JDK Signature interface needed for |
| * signature verification using OpenSSL. |
| */ |
| public class OpenSSLSignature extends SignatureSpi { |
| private static enum EngineType { |
| RSA, EC, |
| }; |
| |
| private NativeRef.EVP_MD_CTX ctx; |
| |
| /** |
| * The current OpenSSL key we're operating on. |
| */ |
| private OpenSSLKey key; |
| |
| /** |
| * Holds the type of the Java algorithm. |
| */ |
| private final EngineType engineType; |
| |
| /** |
| * Holds the OpenSSL name of the algorithm (lower case, no dashes). |
| */ |
| private final long evpAlgorithm; |
| |
| /** |
| * Holds a dummy buffer for writing single bytes to the digest. |
| */ |
| private final byte[] singleByte = new byte[1]; |
| |
| /** |
| * True when engine is initialized to signing. |
| */ |
| private boolean signing; |
| |
| /** |
| * Creates a new OpenSSLSignature instance for the given algorithm name. |
| * |
| * @param algorithm OpenSSL name of the algorithm, e.g. "RSA-SHA1". |
| */ |
| private OpenSSLSignature(long algorithm, EngineType engineType) |
| throws NoSuchAlgorithmException { |
| this.engineType = engineType; |
| this.evpAlgorithm = algorithm; |
| } |
| |
| private final void resetContext() { |
| NativeRef.EVP_MD_CTX ctxLocal = new NativeRef.EVP_MD_CTX(NativeCrypto.EVP_MD_CTX_create()); |
| NativeCrypto.EVP_MD_CTX_init(ctxLocal); |
| if (signing) { |
| enableDSASignatureNonceHardeningIfApplicable(); |
| NativeCrypto.EVP_SignInit(ctxLocal, evpAlgorithm); |
| } else { |
| NativeCrypto.EVP_VerifyInit(ctxLocal, evpAlgorithm); |
| } |
| this.ctx = ctxLocal; |
| } |
| |
| @Override |
| protected void engineUpdate(byte input) { |
| singleByte[0] = input; |
| engineUpdate(singleByte, 0, 1); |
| } |
| |
| @Override |
| protected void engineUpdate(byte[] input, int offset, int len) { |
| final NativeRef.EVP_MD_CTX ctxLocal = ctx; |
| if (signing) { |
| NativeCrypto.EVP_SignUpdate(ctxLocal, input, offset, len); |
| } else { |
| NativeCrypto.EVP_VerifyUpdate(ctxLocal, input, offset, len); |
| } |
| } |
| |
| @Override |
| protected Object engineGetParameter(String param) throws InvalidParameterException { |
| return null; |
| } |
| |
| private void checkEngineType(OpenSSLKey pkey) throws InvalidKeyException { |
| final int pkeyType = NativeCrypto.EVP_PKEY_type(pkey.getNativeRef()); |
| |
| switch (engineType) { |
| case RSA: |
| if (pkeyType != NativeConstants.EVP_PKEY_RSA) { |
| throw new InvalidKeyException("Signature initialized as " + engineType |
| + " (not RSA)"); |
| } |
| break; |
| case EC: |
| if (pkeyType != NativeConstants.EVP_PKEY_EC) { |
| throw new InvalidKeyException("Signature initialized as " + engineType |
| + " (not EC)"); |
| } |
| break; |
| default: |
| throw new InvalidKeyException("Key must be of type " + engineType); |
| } |
| } |
| |
| private void initInternal(OpenSSLKey newKey, boolean signing) throws InvalidKeyException { |
| checkEngineType(newKey); |
| key = newKey; |
| |
| this.signing = signing; |
| resetContext(); |
| } |
| |
| @Override |
| protected void engineInitSign(PrivateKey privateKey) throws InvalidKeyException { |
| initInternal(OpenSSLKey.fromPrivateKey(privateKey), true); |
| } |
| |
| /** |
| * Enables a mitigation against private key leakage through ECDSA |
| * signatures when weak nonces (per-message k values) are used. To mitigate |
| * the issue, private key and message being signed is mixed into the |
| * randomly generated nonce (k). |
| * |
| * <p>Does nothing for signatures that are not ECDSA. |
| */ |
| private void enableDSASignatureNonceHardeningIfApplicable() { |
| final OpenSSLKey key = this.key; |
| switch (engineType) { |
| case EC: |
| NativeCrypto.EC_KEY_set_nonce_from_hash(key.getNativeRef(), true); |
| break; |
| default: |
| // Hardening not applicable |
| } |
| } |
| |
| @Override |
| protected void engineInitVerify(PublicKey publicKey) throws InvalidKeyException { |
| initInternal(OpenSSLKey.fromPublicKey(publicKey), false); |
| } |
| |
| @Override |
| protected void engineSetParameter(String param, Object value) throws InvalidParameterException { |
| } |
| |
| @Override |
| protected byte[] engineSign() throws SignatureException { |
| if (key == null) { |
| // This can't actually happen, but you never know... |
| throw new SignatureException("Need RSA or EC private key"); |
| } |
| |
| final NativeRef.EVP_MD_CTX ctxLocal = ctx; |
| try { |
| byte[] buffer = new byte[NativeCrypto.EVP_PKEY_size(key.getNativeRef())]; |
| int bytesWritten = NativeCrypto.EVP_SignFinal(ctxLocal, buffer, 0, |
| key.getNativeRef()); |
| |
| byte[] signature = new byte[bytesWritten]; |
| System.arraycopy(buffer, 0, signature, 0, bytesWritten); |
| |
| return signature; |
| } catch (Exception ex) { |
| throw new SignatureException(ex); |
| } finally { |
| /* |
| * Java expects the digest context to be reset completely after sign |
| * calls. |
| */ |
| resetContext(); |
| } |
| } |
| |
| @Override |
| protected boolean engineVerify(byte[] sigBytes) throws SignatureException { |
| if (key == null) { |
| // This can't actually happen, but you never know... |
| throw new SignatureException("Need RSA or EC public key"); |
| } |
| |
| try { |
| int result = NativeCrypto.EVP_VerifyFinal(ctx, sigBytes, 0, sigBytes.length, |
| key.getNativeRef()); |
| return result == 1; |
| } catch (Exception ex) { |
| throw new SignatureException(ex); |
| } finally { |
| /* |
| * Java expects the digest context to be reset completely after |
| * verify calls. |
| */ |
| resetContext(); |
| } |
| } |
| |
| public static final class MD5RSA extends OpenSSLSignature { |
| private static final long EVP_MD = NativeCrypto.EVP_get_digestbyname("MD5"); |
| public MD5RSA() throws NoSuchAlgorithmException { |
| super(EVP_MD, EngineType.RSA); |
| } |
| } |
| public static final class SHA1RSA extends OpenSSLSignature { |
| private static final long EVP_MD = NativeCrypto.EVP_get_digestbyname("SHA1"); |
| public SHA1RSA() throws NoSuchAlgorithmException { |
| super(EVP_MD, EngineType.RSA); |
| } |
| } |
| public static final class SHA224RSA extends OpenSSLSignature { |
| private static final long EVP_MD = NativeCrypto.EVP_get_digestbyname("SHA224"); |
| public SHA224RSA() throws NoSuchAlgorithmException { |
| super(EVP_MD, EngineType.RSA); |
| } |
| } |
| public static final class SHA256RSA extends OpenSSLSignature { |
| private static final long EVP_MD = NativeCrypto.EVP_get_digestbyname("SHA256"); |
| public SHA256RSA() throws NoSuchAlgorithmException { |
| super(EVP_MD, EngineType.RSA); |
| } |
| } |
| public static final class SHA384RSA extends OpenSSLSignature { |
| private static final long EVP_MD = NativeCrypto.EVP_get_digestbyname("SHA384"); |
| public SHA384RSA() throws NoSuchAlgorithmException { |
| super(EVP_MD, EngineType.RSA); |
| } |
| } |
| public static final class SHA512RSA extends OpenSSLSignature { |
| private static final long EVP_MD = NativeCrypto.EVP_get_digestbyname("SHA512"); |
| public SHA512RSA() throws NoSuchAlgorithmException { |
| super(EVP_MD, EngineType.RSA); |
| } |
| } |
| public static final class SHA1ECDSA extends OpenSSLSignature { |
| private static final long EVP_MD = NativeCrypto.EVP_get_digestbyname("SHA1"); |
| public SHA1ECDSA() throws NoSuchAlgorithmException { |
| super(EVP_MD, EngineType.EC); |
| } |
| } |
| public static final class SHA224ECDSA extends OpenSSLSignature { |
| private static final long EVP_MD = NativeCrypto.EVP_get_digestbyname("SHA224"); |
| public SHA224ECDSA() throws NoSuchAlgorithmException { |
| super(EVP_MD, EngineType.EC); |
| } |
| } |
| public static final class SHA256ECDSA extends OpenSSLSignature { |
| private static final long EVP_MD = NativeCrypto.EVP_get_digestbyname("SHA256"); |
| public SHA256ECDSA() throws NoSuchAlgorithmException { |
| super(EVP_MD, EngineType.EC); |
| } |
| } |
| public static final class SHA384ECDSA extends OpenSSLSignature { |
| private static final long EVP_MD = NativeCrypto.EVP_get_digestbyname("SHA384"); |
| public SHA384ECDSA() throws NoSuchAlgorithmException { |
| super(EVP_MD, EngineType.EC); |
| } |
| } |
| public static final class SHA512ECDSA extends OpenSSLSignature { |
| private static final long EVP_MD = NativeCrypto.EVP_get_digestbyname("SHA512"); |
| public SHA512ECDSA() throws NoSuchAlgorithmException { |
| super(EVP_MD, EngineType.EC); |
| } |
| } |
| } |
| |