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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.tomitribe.auth.signatures;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.math.BigInteger;
import java.security.KeyFactory;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.spec.EncodedKeySpec;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.RSAPrivateCrtKeySpec;
import java.security.spec.X509EncodedKeySpec;
/**
* Utility for RSA keys.
*/
public enum RSA {
;
private static final String RSA = "RSA";
/**
* Returns a private key constructed from the given DER bytes in PKCS#8 format.
*/
public static PrivateKey privateKeyFromPKCS8(final byte[] pkcs8) throws InvalidKeySpecException {
try {
final EncodedKeySpec privateKeySpec = new PKCS8EncodedKeySpec(pkcs8);
final KeyFactory keyFactory = KeyFactory.getInstance(RSA);
return keyFactory.generatePrivate(privateKeySpec);
} catch (NoSuchAlgorithmException e) {
throw new IllegalStateException(e);
}
}
/**
* Returns a private key constructed from the given DER bytes in PKCS#1 format.
*/
public static PrivateKey privateKeyFromPKCS1(final byte[] pkcs1) throws InvalidKeySpecException {
try {
final RSAPrivateCrtKeySpec privateKeySpec = newRSAPrivateCrtKeySpec(pkcs1);
final KeyFactory keyFactory = KeyFactory.getInstance(RSA);
return keyFactory.generatePrivate(privateKeySpec);
} catch (IOException e) {
throw new IllegalArgumentException(e);
} catch (NoSuchAlgorithmException e) {
throw new IllegalStateException(e);
}
}
/**
* Returns a public key constructed from the given DER bytes.
*/
public static PublicKey publicKeyFrom(final byte[] derBytes) throws InvalidKeySpecException {
try {
final KeyFactory keyFactory = KeyFactory.getInstance(RSA);
final EncodedKeySpec publicKeySpec = new X509EncodedKeySpec(derBytes);
return keyFactory.generatePublic(publicKeySpec);
} catch (NoSuchAlgorithmException e) {
throw new IllegalStateException(e);
}
}
// Extracted from:
// http://oauth.googlecode.com/svn/code/branches/jmeter/jmeter/src/main/java/org/apache/jmeter/protocol/oauth/sampler/PrivateKeyReader.java
// See p.41 of http://www.emc.com/emc-plus/rsa-labs/pkcs/files/h11300-wp-pkcs-1v2-2-rsa-cryptography-standard.pdf
/****************************************************************************
* Amazon Modifications: Copyright 2014 Amazon.com, Inc. or its affiliates.
* All Rights Reserved.
*****************************************************************************
* Copyright (c) 1998-2010 AOL Inc.
*
* 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.
*
****************************************************************************
* Convert PKCS#1 encoded private key into RSAPrivateCrtKeySpec.
*
* The ASN.1 syntax for the private key with CRT is
*
*
* --
* -- Representation of RSA private key with information for the CRT algorithm.
* --
* RSAPrivateKey ::= SEQUENCE {
* version Version,
* modulus INTEGER, -- n
* publicExponent INTEGER, -- e
* privateExponent INTEGER, -- d
* prime1 INTEGER, -- p
* prime2 INTEGER, -- q
* exponent1 INTEGER, -- d mod (p-1)
* exponent2 INTEGER, -- d mod (q-1)
* coefficient INTEGER, -- (inverse of q) mod p
* otherPrimeInfos OtherPrimeInfos OPTIONAL
* }
*
*
* @param keyInPkcs1 PKCS#1 encoded key
* @throws java.io.IOException
*/
private static RSAPrivateCrtKeySpec newRSAPrivateCrtKeySpec(final byte[] keyInPkcs1) throws IOException {
final DerParser parser = new DerParser(keyInPkcs1);
final Asn1Object sequence = parser.read();
if (sequence.getType() != DerParser.SEQUENCE) {
throw new IllegalArgumentException("Invalid DER: not a sequence");
}
// Parse inside the sequence
final DerParser p = sequence.getParser();
p.read(); // Skip version
final BigInteger modulus = p.read().getInteger();
final BigInteger publicExp = p.read().getInteger();
final BigInteger privateExp = p.read().getInteger();
final BigInteger prime1 = p.read().getInteger();
final BigInteger prime2 = p.read().getInteger();
final BigInteger exp1 = p.read().getInteger();
final BigInteger exp2 = p.read().getInteger();
final BigInteger crtCoef = p.read().getInteger();
return new RSAPrivateCrtKeySpec(modulus, publicExp, privateExp, prime1, prime2, exp1, exp2, crtCoef);
}
/**
* An ASN.1 TLV. The object is not parsed. It can
* only handle integers and strings.
*
* @author zhang
*/
static class Asn1Object {
protected final int type;
protected final int length;
protected final byte[] value;
protected final int tag;
/**
* Construct a ASN.1 TLV. The TLV could be either a
* constructed or primitive entity.
*
* The first byte in DER encoding is made of following fields,
*
Class: Universal, Application, Context or Private
*
CF: Constructed flag. If 1, the field is constructed.
*
Type: This is actually called tag in ASN.1. It
* indicates data type (Integer, String) or a construct
* (sequence, choice, set).
*
*
* @param tag Tag or Identifier
* @param length Length of the field
* @param value Encoded octet string for the field.
*/
public Asn1Object(int tag, int length, byte[] value) {
this.tag = tag;
this.type = tag & 0x1F;
this.length = length;
this.value = value;
}
public int getType() {
return type;
}
public int getLength() {
return length;
}
public byte[] getValue() {
return value;
}
public boolean isConstructed() {
return (tag & DerParser.CONSTRUCTED) == DerParser.CONSTRUCTED;
}
/**
* For constructed field, return a parser for its content.
*
* @return A parser for the construct.
*/
public DerParser getParser() throws IOException {
if (!isConstructed()) {
throw new IOException("Invalid DER: can't parse primitive entity");
}
return new DerParser(value);
}
/**
* Get the value as integer
*/
public BigInteger getInteger() throws IOException {
if (type != DerParser.INTEGER) {
throw new IOException("Invalid DER: object is not integer");
}
return new BigInteger(value);
}
/**
* Get value as string. Most strings are treated
* as Latin-1.
*/
public String getString() throws IOException {
switch (type) {
// Not all are Latin-1 but it's the closest thing
case DerParser.NUMERIC_STRING:
case DerParser.PRINTABLE_STRING:
case DerParser.VIDEOTEX_STRING:
case DerParser.IA5_STRING:
case DerParser.GRAPHIC_STRING:
case DerParser.ISO646_STRING:
case DerParser.GENERAL_STRING:
return new String(value, "ISO-8859-1");
case DerParser.BMP_STRING:
return new String(value, "UTF-16BE");
case DerParser.UTF8_STRING:
return new String(value, "UTF-8");
case DerParser.UNIVERSAL_STRING:
throw new IOException("Invalid DER: can't handle UCS-4 string");
default:
throw new IOException("Invalid DER: object is not a string");
}
}
}
/**
* A bare-minimum ASN.1 DER decoder, just having enough functions to decode
* PKCS#1 private keys. Especially, it doesn't handle explicitly tagged types
* with an outer tag.
*
*
* This parser can only handle one layer. To parse nested constructs, get a new
* parser for each layer using Asn1Object.getParser().
*
*
* There are many DER decoders in JRE but using them will tie this program to a
* specific JCE/JVM.
*
* @author zhang
*/
static class DerParser {
// Classes
public final static int UNIVERSAL = 0x00;
public final static int APPLICATION = 0x40;
public final static int CONTEXT = 0x80;
public final static int PRIVATE = 0xC0;
// Constructed Flag
public final static int CONSTRUCTED = 0x20;
// Tag and data types
public final static int ANY = 0x00;
public final static int BOOLEAN = 0x01;
public final static int INTEGER = 0x02;
public final static int BIT_STRING = 0x03;
public final static int OCTET_STRING = 0x04;
public final static int NULL = 0x05;
public final static int OBJECT_IDENTIFIER = 0x06;
public final static int REAL = 0x09;
public final static int ENUMERATED = 0x0a;
public final static int RELATIVE_OID = 0x0d;
public final static int SEQUENCE = 0x10;
public final static int SET = 0x11;
public final static int NUMERIC_STRING = 0x12;
public final static int PRINTABLE_STRING = 0x13;
public final static int T61_STRING = 0x14;
public final static int VIDEOTEX_STRING = 0x15;
public final static int IA5_STRING = 0x16;
public final static int GRAPHIC_STRING = 0x19;
public final static int ISO646_STRING = 0x1A;
public final static int GENERAL_STRING = 0x1B;
public final static int UTF8_STRING = 0x0C;
public final static int UNIVERSAL_STRING = 0x1C;
public final static int BMP_STRING = 0x1E;
public final static int UTC_TIME = 0x17;
public final static int GENERALIZED_TIME = 0x18;
protected final InputStream in;
/**
* Create a new DER decoder from an input stream.
*
* @param in
* The DER encoded stream
*/
public DerParser(final InputStream in) throws IOException {
this.in = in;
}
/**
* Create a new DER decoder from a byte array.
*
* @param bytes the encoded bytes
*/
public DerParser(final byte[] bytes) throws IOException {
this(new ByteArrayInputStream(bytes));
}
/**
* Read next object. If it's constructed, the value holds encoded content
* and it should be parsed by a new parser from
* Asn1Object.getParser.
*/
public Asn1Object read() throws IOException {
final int tag = in.read();
if (tag == -1) {
throw new IOException("Invalid DER: stream too short, missing tag");
}
final int length = getLength();
final byte[] value = new byte[length];
final int n = in.read(value);
if (n < length) {
throw new IOException("Invalid DER: stream too short, missing value");
}
return new Asn1Object(tag, length, value);
}
/**
* Decode the length of the field. Can only support length encoding up to 4
* octets.
*
*
* In BER/DER encoding, length can be encoded in 2 forms,
*
*
Short form. One octet. Bit 8 has value "0" and bits 7-1 give the
* length.
*
Long form. Two to 127 octets (only 4 is supported here). Bit 8 of
* first octet has value "1" and bits 7-1 give the number of additional
* length octets. Second and following octets give the length, base 256,
* most significant digit first.
*
*
* @return The length as integer
*/
private int getLength() throws IOException {
final int i = in.read();
if (i == -1) {
throw new IOException("Invalid DER: length missing");
}
// A single byte short length
if ((i & ~0x7F) == 0) return i;
final int num = i & 0x7F;
// We can't handle length longer than 4 bytes
if (i >= 0xFF || num > 4) {
throw new IOException("Invalid DER: length field too big (" + i + ")");
}
final byte[] bytes = new byte[num];
final int n = in.read(bytes);
if (n < num) {
throw new IOException("Invalid DER: length too short");
}
return new BigInteger(1, bytes).intValue();
}
}
}
