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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.RC2ParameterSpec;
import sun.misc.HexDumpEncoder;
import sun.security.util.*;

This class implements the parameter set used with RC2 encryption, which is defined in RFC2268 as follows:
RC2-CBCParameter ::= CHOICE {
  iv IV,
  params SEQUENCE {
    version RC2Version,
    iv IV
  }
}
where
IV ::= OCTET STRING -- 8 octets
RC2Version ::= INTEGER -- 1-1024
Author:Sean Mullan
Since:1.5
/** * This class implements the parameter set used with RC2 * encryption, which is defined in RFC2268 as follows: * * <pre> * RC2-CBCParameter ::= CHOICE { * iv IV, * params SEQUENCE { * version RC2Version, * iv IV * } * } * * where * * IV ::= OCTET STRING -- 8 octets * RC2Version ::= INTEGER -- 1-1024 * </pre> * * @author Sean Mullan * @since 1.5 */
public final class RC2Parameters extends AlgorithmParametersSpi { // TABLE[EKB] from section 6 of RFC 2268, used to convert effective key // size to/from encoded version number private final static int[] EKB_TABLE = new int[] { 0xbd, 0x56, 0xea, 0xf2, 0xa2, 0xf1, 0xac, 0x2a, 0xb0, 0x93, 0xd1, 0x9c, 0x1b, 0x33, 0xfd, 0xd0, 0x30, 0x04, 0xb6, 0xdc, 0x7d, 0xdf, 0x32, 0x4b, 0xf7, 0xcb, 0x45, 0x9b, 0x31, 0xbb, 0x21, 0x5a, 0x41, 0x9f, 0xe1, 0xd9, 0x4a, 0x4d, 0x9e, 0xda, 0xa0, 0x68, 0x2c, 0xc3, 0x27, 0x5f, 0x80, 0x36, 0x3e, 0xee, 0xfb, 0x95, 0x1a, 0xfe, 0xce, 0xa8, 0x34, 0xa9, 0x13, 0xf0, 0xa6, 0x3f, 0xd8, 0x0c, 0x78, 0x24, 0xaf, 0x23, 0x52, 0xc1, 0x67, 0x17, 0xf5, 0x66, 0x90, 0xe7, 0xe8, 0x07, 0xb8, 0x60, 0x48, 0xe6, 0x1e, 0x53, 0xf3, 0x92, 0xa4, 0x72, 0x8c, 0x08, 0x15, 0x6e, 0x86, 0x00, 0x84, 0xfa, 0xf4, 0x7f, 0x8a, 0x42, 0x19, 0xf6, 0xdb, 0xcd, 0x14, 0x8d, 0x50, 0x12, 0xba, 0x3c, 0x06, 0x4e, 0xec, 0xb3, 0x35, 0x11, 0xa1, 0x88, 0x8e, 0x2b, 0x94, 0x99, 0xb7, 0x71, 0x74, 0xd3, 0xe4, 0xbf, 0x3a, 0xde, 0x96, 0x0e, 0xbc, 0x0a, 0xed, 0x77, 0xfc, 0x37, 0x6b, 0x03, 0x79, 0x89, 0x62, 0xc6, 0xd7, 0xc0, 0xd2, 0x7c, 0x6a, 0x8b, 0x22, 0xa3, 0x5b, 0x05, 0x5d, 0x02, 0x75, 0xd5, 0x61, 0xe3, 0x18, 0x8f, 0x55, 0x51, 0xad, 0x1f, 0x0b, 0x5e, 0x85, 0xe5, 0xc2, 0x57, 0x63, 0xca, 0x3d, 0x6c, 0xb4, 0xc5, 0xcc, 0x70, 0xb2, 0x91, 0x59, 0x0d, 0x47, 0x20, 0xc8, 0x4f, 0x58, 0xe0, 0x01, 0xe2, 0x16, 0x38, 0xc4, 0x6f, 0x3b, 0x0f, 0x65, 0x46, 0xbe, 0x7e, 0x2d, 0x7b, 0x82, 0xf9, 0x40, 0xb5, 0x1d, 0x73, 0xf8, 0xeb, 0x26, 0xc7, 0x87, 0x97, 0x25, 0x54, 0xb1, 0x28, 0xaa, 0x98, 0x9d, 0xa5, 0x64, 0x6d, 0x7a, 0xd4, 0x10, 0x81, 0x44, 0xef, 0x49, 0xd6, 0xae, 0x2e, 0xdd, 0x76, 0x5c, 0x2f, 0xa7, 0x1c, 0xc9, 0x09, 0x69, 0x9a, 0x83, 0xcf, 0x29, 0x39, 0xb9, 0xe9, 0x4c, 0xff, 0x43, 0xab }; // the iv private byte[] iv; // the version number private int version = 0; // the effective key size private int effectiveKeySize = 0; public RC2Parameters() {} protected void engineInit(AlgorithmParameterSpec paramSpec) throws InvalidParameterSpecException { if (!(paramSpec instanceof RC2ParameterSpec)) { throw new InvalidParameterSpecException ("Inappropriate parameter specification"); } RC2ParameterSpec rps = (RC2ParameterSpec) paramSpec; // check effective key size (a value of 0 means it is unspecified) effectiveKeySize = rps.getEffectiveKeyBits(); if (effectiveKeySize != 0) { if (effectiveKeySize < 1 || effectiveKeySize > 1024) { throw new InvalidParameterSpecException("RC2 effective key " + "size must be between 1 and 1024 bits"); } if (effectiveKeySize < 256) { version = EKB_TABLE[effectiveKeySize]; } else { version = effectiveKeySize; } } this.iv = rps.getIV(); } protected void engineInit(byte[] encoded) throws IOException { DerValue val = new DerValue(encoded); // check if IV or params if (val.tag == DerValue.tag_Sequence) { val.data.reset(); version = val.data.getInteger(); if (version < 0 || version > 1024) { throw new IOException("RC2 parameter parsing error: " + "version number out of legal range (0-1024): " + version); } if (version > 255) { effectiveKeySize = version; } else { // search table for index containing version for (int i = 0; i < EKB_TABLE.length; i++) { if (version == EKB_TABLE[i]) { effectiveKeySize = i; break; } } } iv = val.data.getOctetString(); } else { val.data.reset(); iv = val.getOctetString(); version = 0; effectiveKeySize = 0; } if (iv.length != 8) { throw new IOException("RC2 parameter parsing error: iv length " + "must be 8 bits, actual: " + iv.length); } if (val.data.available() != 0) { throw new IOException("RC2 parameter parsing error: extra data"); } } protected void engineInit(byte[] encoded, String decodingMethod) throws IOException { engineInit(encoded); } protected <T extends AlgorithmParameterSpec> T engineGetParameterSpec(Class<T> paramSpec) throws InvalidParameterSpecException { if (RC2ParameterSpec.class.isAssignableFrom(paramSpec)) { return paramSpec.cast((iv == null ? new RC2ParameterSpec(effectiveKeySize) : new RC2ParameterSpec(effectiveKeySize, iv))); } else { throw new InvalidParameterSpecException ("Inappropriate parameter specification"); } } protected byte[] engineGetEncoded() throws IOException { DerOutputStream out = new DerOutputStream(); DerOutputStream bytes = new DerOutputStream(); if (this.effectiveKeySize != 0) { bytes.putInteger(version); bytes.putOctetString(iv); out.write(DerValue.tag_Sequence, bytes); } else { out.putOctetString(iv); } 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) + "]"); if (version != 0) { sb.append(LINE_SEP + "version:" + LINE_SEP + version + LINE_SEP); } return sb.toString(); } }