| /* |
| * Copyright (c) 2013, 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 com.sun.crypto.provider; |
| |
| import java.io.IOException; |
| import java.security.AlgorithmParametersSpi; |
| import java.security.spec.AlgorithmParameterSpec; |
| import java.security.spec.InvalidParameterSpecException; |
| import javax.crypto.spec.GCMParameterSpec; |
| import sun.security.util.HexDumpEncoder; |
| import sun.security.util.*; |
| |
| /** |
| * This class implements the parameter set used with |
| * GCM encryption, which is defined in RFC 5084 as follows: |
| * |
| * <pre> |
| * GCMParameters ::= SEQUENCE { |
| * aes-iv OCTET STRING, -- recommended size is 12 octets |
| * aes-tLen AES-GCM-ICVlen DEFAULT 12 } |
| * |
| * AES-GCM-ICVlen ::= INTEGER (12 | 13 | 14 | 15 | 16) |
| * |
| * </pre> |
| * |
| * @author Valerie Peng |
| * @since 1.8 |
| */ |
| public final class GCMParameters extends AlgorithmParametersSpi { |
| |
| // the iv |
| private byte[] iv; |
| // the tag length in bytes |
| private int tLen; |
| |
| public GCMParameters() {} |
| |
| protected void engineInit(AlgorithmParameterSpec paramSpec) |
| throws InvalidParameterSpecException { |
| |
| if (!(paramSpec instanceof GCMParameterSpec)) { |
| throw new InvalidParameterSpecException |
| ("Inappropriate parameter specification"); |
| } |
| GCMParameterSpec gps = (GCMParameterSpec) paramSpec; |
| // need to convert from bits to bytes for ASN.1 encoding |
| this.tLen = gps.getTLen()/8; |
| this.iv = gps.getIV(); |
| } |
| |
| protected void engineInit(byte[] encoded) throws IOException { |
| DerValue val = new DerValue(encoded); |
| // check if IV or params |
| if (val.tag == DerValue.tag_Sequence) { |
| byte[] iv = val.data.getOctetString(); |
| int tLen; |
| if (val.data.available() != 0) { |
| tLen = val.data.getInteger(); |
| if (tLen < 12 || tLen > 16 ) { |
| throw new IOException |
| ("GCM parameter parsing error: unsupported tag len: " + |
| tLen); |
| } |
| if (val.data.available() != 0) { |
| throw new IOException |
| ("GCM parameter parsing error: extra data"); |
| } |
| } else { |
| tLen = 12; |
| } |
| this.iv = iv.clone(); |
| this.tLen = tLen; |
| } else { |
| throw new IOException("GCM parameter parsing error: no SEQ tag"); |
| } |
| } |
| |
| protected void engineInit(byte[] encoded, String decodingMethod) |
| throws IOException { |
| engineInit(encoded); |
| } |
| |
| protected <T extends AlgorithmParameterSpec> |
| T engineGetParameterSpec(Class<T> paramSpec) |
| throws InvalidParameterSpecException { |
| |
| if (GCMParameterSpec.class.isAssignableFrom(paramSpec)) { |
| return paramSpec.cast(new GCMParameterSpec(tLen * 8, iv)); |
| } else { |
| throw new InvalidParameterSpecException |
| ("Inappropriate parameter specification"); |
| } |
| } |
| |
| protected byte[] engineGetEncoded() throws IOException { |
| DerOutputStream out = new DerOutputStream(); |
| DerOutputStream bytes = new DerOutputStream(); |
| |
| bytes.putOctetString(iv); |
| bytes.putInteger(tLen); |
| out.write(DerValue.tag_Sequence, bytes); |
| return out.toByteArray(); |
| } |
| |
| protected byte[] engineGetEncoded(String encodingMethod) |
| throws IOException { |
| return engineGetEncoded(); |
| } |
| |
| /* |
| * Returns a formatted string describing the parameters. |
| */ |
| protected String engineToString() { |
| String LINE_SEP = System.getProperty("line.separator"); |
| HexDumpEncoder encoder = new HexDumpEncoder(); |
| StringBuilder sb |
| = new StringBuilder(LINE_SEP + " iv:" + LINE_SEP + "[" |
| + encoder.encodeBuffer(iv) + "]"); |
| |
| sb.append(LINE_SEP + "tLen(bits):" + LINE_SEP + tLen*8 + LINE_SEP); |
| return sb.toString(); |
| } |
| } |