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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/gnu/java/security/key/rsa/RSAKeyPairRawCodec.java | |
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Diffstat (limited to 'libjava/classpath/gnu/java/security/key/rsa/RSAKeyPairRawCodec.java')
-rw-r--r-- | libjava/classpath/gnu/java/security/key/rsa/RSAKeyPairRawCodec.java | 300 |
1 files changed, 300 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/java/security/key/rsa/RSAKeyPairRawCodec.java b/libjava/classpath/gnu/java/security/key/rsa/RSAKeyPairRawCodec.java new file mode 100644 index 000000000..f088e794e --- /dev/null +++ b/libjava/classpath/gnu/java/security/key/rsa/RSAKeyPairRawCodec.java @@ -0,0 +1,300 @@ +/* RSAKeyPairRawCodec.java -- + Copyright 2001, 2002, 2003, 2006 Free Software Foundation, Inc. + +This file is a part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2 of the License, or (at +your option) any later version. + +GNU Classpath 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 for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; if not, write to the Free Software +Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 +USA + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package gnu.java.security.key.rsa; + +import gnu.java.security.Registry; +import gnu.java.security.key.IKeyPairCodec; + +import java.io.ByteArrayOutputStream; +import java.math.BigInteger; +import java.security.PrivateKey; +import java.security.PublicKey; + +/** + * An object that implements the {@link IKeyPairCodec} interface for the <i>Raw</i> + * format to use with RSA keypairs. + */ +public class RSAKeyPairRawCodec + implements IKeyPairCodec +{ + // implicit 0-arguments constructor + + public int getFormatID() + { + return RAW_FORMAT; + } + + /** + * Returns the encoded form of the designated RSA public key according to the + * <i>Raw</i> format supported by this library. + * <p> + * The <i>Raw</i> format for an RSA public key, in this implementation, is a + * byte sequence consisting of the following: + * <ol> + * <li>4-byte magic consisting of the value of the literal + * {@link Registry#MAGIC_RAW_RSA_PUBLIC_KEY},</li> + * <li>1-byte version consisting of the constant: 0x01,</li> + * <li>4-byte count of following bytes representing the RSA parameter + * <code>n</code> (the modulus) in internet order,</li> + * <li>n-bytes representation of a {@link BigInteger} obtained by invoking + * the <code>toByteArray()</code> method on the RSA parameter <code>n</code>, + * </li> + * <li>4-byte count of following bytes representing the RSA parameter + * <code>e</code> (the public exponent) in internet order,</li> + * <li>n-bytes representation of a {@link BigInteger} obtained by invoking + * the <code>toByteArray()</code> method on the RSA parameter <code>e</code>. + * </li> + * </ol> + * + * @param key the key to encode. + * @return the <i>Raw</i> format encoding of the designated key. + * @exception IllegalArgumentException if the designated key is not an RSA + * one. + */ + public byte[] encodePublicKey(PublicKey key) + { + if (! (key instanceof GnuRSAPublicKey)) + throw new IllegalArgumentException("key"); + + GnuRSAPublicKey rsaKey = (GnuRSAPublicKey) key; + ByteArrayOutputStream baos = new ByteArrayOutputStream(); + // magic + baos.write(Registry.MAGIC_RAW_RSA_PUBLIC_KEY[0]); + baos.write(Registry.MAGIC_RAW_RSA_PUBLIC_KEY[1]); + baos.write(Registry.MAGIC_RAW_RSA_PUBLIC_KEY[2]); + baos.write(Registry.MAGIC_RAW_RSA_PUBLIC_KEY[3]); + // version + baos.write(0x01); + // n + byte[] buffer = rsaKey.getModulus().toByteArray(); + int length = buffer.length; + baos.write(length >>> 24); + baos.write((length >>> 16) & 0xFF); + baos.write((length >>> 8) & 0xFF); + baos.write(length & 0xFF); + baos.write(buffer, 0, length); + // e + buffer = rsaKey.getPublicExponent().toByteArray(); + length = buffer.length; + baos.write(length >>> 24); + baos.write((length >>> 16) & 0xFF); + baos.write((length >>> 8) & 0xFF); + baos.write(length & 0xFF); + baos.write(buffer, 0, length); + return baos.toByteArray(); + } + + public PublicKey decodePublicKey(byte[] k) + { + // magic + if (k[0] != Registry.MAGIC_RAW_RSA_PUBLIC_KEY[0] + || k[1] != Registry.MAGIC_RAW_RSA_PUBLIC_KEY[1] + || k[2] != Registry.MAGIC_RAW_RSA_PUBLIC_KEY[2] + || k[3] != Registry.MAGIC_RAW_RSA_PUBLIC_KEY[3]) + throw new IllegalArgumentException("magic"); + + // version + if (k[4] != 0x01) + throw new IllegalArgumentException("version"); + + int i = 5; + int l; + byte[] buffer; + // n + l = k[i++] << 24 + | (k[i++] & 0xFF) << 16 + | (k[i++] & 0xFF) << 8 + | (k[i++] & 0xFF); + buffer = new byte[l]; + System.arraycopy(k, i, buffer, 0, l); + i += l; + BigInteger n = new BigInteger(1, buffer); + // e + l = k[i++] << 24 + | (k[i++] & 0xFF) << 16 + | (k[i++] & 0xFF) << 8 + | (k[i++] & 0xFF); + buffer = new byte[l]; + System.arraycopy(k, i, buffer, 0, l); + i += l; + BigInteger e = new BigInteger(1, buffer); + return new GnuRSAPublicKey(n, e); + } + + /** + * Returns the encoded form of the designated RSA private key according to the + * <i>Raw</i> format supported by this library. + * <p> + * The <i>Raw</i> format for an RSA private key, in this implementation, is a + * byte sequence consisting of the following: + * <ol> + * <li>4-byte magic consisting of the value of the literal + * {@link Registry#MAGIC_RAW_RSA_PRIVATE_KEY},</li> + * <li>1-byte version consisting of the constant: 0x01,</li> + * <li>4-byte count of following bytes representing the RSA parameter + * <code>p</code> (the first prime factor of the modulus) in internet order, + * </li> + * <li>n-bytes representation of a {@link BigInteger} obtained by invoking + * the <code>toByteArray()</code> method on the RSA parameter <code>p</code>, + * </li> + * <li>4-byte count of following bytes representing the RSA parameter + * <code>q</code> (the second prime factor of the modulus) in internet + * order,</li> + * <li>n-bytes representation of a {@link BigInteger} obtained by invoking + * the <code>toByteArray()</code> method on the RSA parameter <code>q</code>, + * </li> + * <li>4-byte count of following bytes representing the RSA parameter + * <code>e</code> (the public exponent) in internet order,</li> + * <li>n-bytes representation of a {@link BigInteger} obtained by invoking + * the <code>toByteArray()</code> method on the RSA parameter <code>e</code>, + * </li> + * <li>4-byte count of following bytes representing the RSA parameter + * <code>d</code> (the private exponent) in internet order,</li> + * <li>n-bytes representation of a {@link BigInteger} obtained by invoking + * the <code>toByteArray()</code> method on the RSA parameter <code>d</code>, + * </li> + * </ol> + * + * @param key the key to encode. + * @return the <i>Raw</i> format encoding of the designated key. + */ + public byte[] encodePrivateKey(PrivateKey key) + { + if (! (key instanceof GnuRSAPrivateKey)) + throw new IllegalArgumentException("key"); + + GnuRSAPrivateKey rsaKey = (GnuRSAPrivateKey) key; + ByteArrayOutputStream baos = new ByteArrayOutputStream(); + // magic + baos.write(Registry.MAGIC_RAW_RSA_PRIVATE_KEY[0]); + baos.write(Registry.MAGIC_RAW_RSA_PRIVATE_KEY[1]); + baos.write(Registry.MAGIC_RAW_RSA_PRIVATE_KEY[2]); + baos.write(Registry.MAGIC_RAW_RSA_PRIVATE_KEY[3]); + // version + baos.write(0x01); + // p + byte[] buffer = rsaKey.getPrimeP().toByteArray(); + int length = buffer.length; + baos.write(length >>> 24); + baos.write((length >>> 16) & 0xFF); + baos.write((length >>> 8) & 0xFF); + baos.write(length & 0xFF); + baos.write(buffer, 0, length); + // q + buffer = rsaKey.getPrimeQ().toByteArray(); + length = buffer.length; + baos.write(length >>> 24); + baos.write((length >>> 16) & 0xFF); + baos.write((length >>> 8) & 0xFF); + baos.write(length & 0xFF); + baos.write(buffer, 0, length); + // e + buffer = rsaKey.getPublicExponent().toByteArray(); + length = buffer.length; + baos.write(length >>> 24); + baos.write((length >>> 16) & 0xFF); + baos.write((length >>> 8) & 0xFF); + baos.write(length & 0xFF); + baos.write(buffer, 0, length); + // d + buffer = rsaKey.getPrivateExponent().toByteArray(); + length = buffer.length; + baos.write(length >>> 24); + baos.write((length >>> 16) & 0xFF); + baos.write((length >>> 8) & 0xFF); + baos.write(length & 0xFF); + baos.write(buffer, 0, length); + return baos.toByteArray(); + } + + public PrivateKey decodePrivateKey(byte[] k) + { + // magic + if (k[0] != Registry.MAGIC_RAW_RSA_PRIVATE_KEY[0] + || k[1] != Registry.MAGIC_RAW_RSA_PRIVATE_KEY[1] + || k[2] != Registry.MAGIC_RAW_RSA_PRIVATE_KEY[2] + || k[3] != Registry.MAGIC_RAW_RSA_PRIVATE_KEY[3]) + throw new IllegalArgumentException("magic"); + + // version + if (k[4] != 0x01) + throw new IllegalArgumentException("version"); + + int i = 5; + int l; + byte[] buffer; + // p + l = k[i++] << 24 + | (k[i++] & 0xFF) << 16 + | (k[i++] & 0xFF) << 8 + | (k[i++] & 0xFF); + buffer = new byte[l]; + System.arraycopy(k, i, buffer, 0, l); + i += l; + BigInteger p = new BigInteger(1, buffer); + // q + l = k[i++] << 24 + | (k[i++] & 0xFF) << 16 + | (k[i++] & 0xFF) << 8 + | (k[i++] & 0xFF); + buffer = new byte[l]; + System.arraycopy(k, i, buffer, 0, l); + i += l; + BigInteger q = new BigInteger(1, buffer); + // e + l = k[i++] << 24 + | (k[i++] & 0xFF) << 16 + | (k[i++] & 0xFF) << 8 + | (k[i++] & 0xFF); + buffer = new byte[l]; + System.arraycopy(k, i, buffer, 0, l); + i += l; + BigInteger e = new BigInteger(1, buffer); + // d + l = k[i++] << 24 + | (k[i++] & 0xFF) << 16 + | (k[i++] & 0xFF) << 8 + | (k[i++] & 0xFF); + buffer = new byte[l]; + System.arraycopy(k, i, buffer, 0, l); + i += l; + BigInteger d = new BigInteger(1, buffer); + return new GnuRSAPrivateKey(p, q, e, d); + } +} |