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authorThe Android Open Source Project <initial-contribution@android.com>2009-03-03 18:29:04 -0800
committerThe Android Open Source Project <initial-contribution@android.com>2009-03-03 18:29:04 -0800
commite54eebbf1a908d65ee8cf80bab62821c05666d70 (patch)
tree4b825dc642cb6eb9a060e54bf8d69288fbee4904 /libmincrypt/tools/DumpPublicKey.java
parenta1e1c1b106423de09bc918502e7a51d4ffe5a4ae (diff)
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auto import from //depot/cupcake/@135843
Diffstat (limited to 'libmincrypt/tools/DumpPublicKey.java')
-rw-r--r--libmincrypt/tools/DumpPublicKey.java130
1 files changed, 0 insertions, 130 deletions
diff --git a/libmincrypt/tools/DumpPublicKey.java b/libmincrypt/tools/DumpPublicKey.java
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--- a/libmincrypt/tools/DumpPublicKey.java
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@@ -1,130 +0,0 @@
-/*
- * 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 com.android.dumpkey;
-
-import java.io.FileInputStream;
-import java.math.BigInteger;
-import java.security.cert.CertificateFactory;
-import java.security.cert.Certificate;
-import java.security.KeyStore;
-import java.security.Key;
-import java.security.PublicKey;
-import java.security.interfaces.RSAPublicKey;
-import sun.misc.BASE64Encoder;
-
-/**
- * Command line tool to extract RSA public keys from X.509 certificates
- * and output source code with data initializers for the keys.
- * @hide
- */
-class DumpPublicKey {
- /**
- * @param key to perform sanity checks on
- * @throws Exception if the key has the wrong size or public exponent
- */
- static void check(RSAPublicKey key) throws Exception {
- BigInteger pubexp = key.getPublicExponent();
- BigInteger modulus = key.getModulus();
-
- if (!pubexp.equals(BigInteger.valueOf(3)))
- throw new Exception("Public exponent should be 3 but is " +
- pubexp.toString(10) + ".");
-
- if (modulus.bitLength() != 2048)
- throw new Exception("Modulus should be 2048 bits long but is " +
- modulus.bitLength() + " bits.");
- }
-
- /**
- * @param key to output
- * @return a C initializer representing this public key.
- */
- static String print(RSAPublicKey key) throws Exception {
- check(key);
-
- BigInteger N = key.getModulus();
-
- StringBuilder result = new StringBuilder();
-
- int nwords = N.bitLength() / 32; // # of 32 bit integers in modulus
-
- result.append("{");
- result.append(nwords);
-
- BigInteger B = BigInteger.valueOf(0x100000000L); // 2^32
- BigInteger N0inv = B.subtract(N.modInverse(B)); // -1 / N[0] mod 2^32
-
- result.append(",0x");
- result.append(N0inv.toString(16));
-
- BigInteger R = BigInteger.valueOf(2).pow(N.bitLength());
- BigInteger RR = R.multiply(R).mod(N); // 2^4096 mod N
-
- // Write out modulus as little endian array of integers.
- result.append(",{");
- for (int i = 0; i < nwords; ++i) {
- int n = N.mod(B).intValue();
- result.append(n);
-
- if (i != nwords - 1) {
- result.append(",");
- }
-
- N = N.divide(B);
- }
- result.append("}");
-
- // Write R^2 as little endian array of integers.
- result.append(",{");
- for (int i = 0; i < nwords; ++i) {
- int rr = RR.mod(B).intValue();
- result.append(rr);
-
- if (i != nwords - 1) {
- result.append(",");
- }
-
- RR = RR.divide(B);
- }
- result.append("}");
-
- result.append("}");
- return result.toString();
- }
-
- public static void main(String[] args) {
- if (args.length < 1) {
- System.err.println("Usage: DumpPublicKey certfile ... > source.c");
- System.exit(1);
- }
- try {
- for (int i = 0; i < args.length; i++) {
- FileInputStream input = new FileInputStream(args[i]);
- CertificateFactory cf = CertificateFactory.getInstance("X.509");
- Certificate cert = cf.generateCertificate(input);
- RSAPublicKey key = (RSAPublicKey) (cert.getPublicKey());
- check(key);
- System.out.print(print(key));
- System.out.println(i < args.length - 1 ? "," : "");
- }
- } catch (Exception e) {
- e.printStackTrace();
- System.exit(1);
- }
- System.exit(0);
- }
-}