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BEGIN LICENSE BLOCK ***** Version: CPL 1.0/GPL 2.0/LGPL 2.1 The contents of this file are subject to the Common Public License Version 1.0 (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.eclipse.org/legal/cpl-v10.html Software distributed under the License is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for the specific language governing rights and limitations under the License. Copyright (C) 2006, 2007 Ola Bini <ola@ologix.com> Alternatively, the contents of this file may be used under the terms of either of the GNU General Public License Version 2 or later (the "GPL"), or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), in which case the provisions of the GPL or the LGPL are applicable instead of those above. If you wish to allow use of your version of this file only under the terms of either the GPL or the LGPL, and not to allow others to use your version of this file under the terms of the CPL, indicate your decision by deleting the provisions above and replace them with the notice and other provisions required by the GPL or the LGPL. If you do not delete the provisions above, a recipient may use your version of this file under the terms of any one of the CPL, the GPL or the LGPL. END LICENSE BLOCK ***
 
 package org.jruby.ext.openssl;
 
 
 import org.jruby.Ruby;

Author(s):
Ola Bini
 
 public class Digest extends RubyObject {
     private static final long serialVersionUID = 1L;
 
     private static ObjectAllocator DIGEST_ALLOCATOR = new ObjectAllocator() {
         public IRubyObject allocate(Ruby runtimeRubyClass klass) {
             return new Digest(runtimeklass);
         }
     };
 
     public static void createDigest(Ruby runtimeRubyModule mOSSL) {
         runtime.getLoadService().require("digest");
         RubyModule mDigest = runtime.getModule("Digest");
         RubyClass cDigestClass = mDigest.getClass("Class");
         RubyClass cDigest = mOSSL.defineClassUnder("Digest"cDigestClass);
         cDigest.defineAnnotatedMethods(Digest.class);
         RubyClass openSSLError = mOSSL.getClass("OpenSSLError");
         mOSSL.defineClassUnder("DigestError"openSSLErroropenSSLError.getAllocator());
     }
 
     static MessageDigest getDigest(final String namefinal Ruby runtime) {
         String algorithm = transformDigest(name);
         try {
             return MessageDigest.getInstance(algorithm);
         } catch (NoSuchAlgorithmException e) {
             try {
                 return OpenSSLReal.getMessageDigestBC(algorithm);
             } catch (GeneralSecurityException ignore) {
             }
             throw runtime.newNotImplementedError("Unsupported digest algorithm (" + name + ")");
         }
     }
 
     // name mapping for openssl -> JCE
     private static String transformDigest(String inp) {
         String[] sp = inp.split("::");
         if (sp.length > 1) { // We only want Digest names from the last part of class name
             inp = sp[sp.length - 1];
         }
         // MessageDigest algorithm name normalization.
         // BC accepts "SHA1" but it should be "SHA-1" per spec.
         if ("DSS".equalsIgnoreCase(inp)) {
             return "SHA";   // why?
         } else if ("DSS1".equalsIgnoreCase(inp)) {
             return "SHA-1";
         } else if (inp.toUpperCase().startsWith("SHA") && inp.length() > 3 && inp.charAt(3) != '-') {
             inp = "SHA-" + inp.substring(3);
         }
         return inp;
     }
 
     public Digest(Ruby runtimeRubyClass type) {
         super(runtime,type);
        // do not initialize MessageDigest at allocation time (same as the ruby-openssl)
         = null;
         = null;
    }
    private MessageDigest algo;
    private String name;
    public String getRealName() {
        return transformDigest();
    }
    public String getName() {
        return ;
    }
    @JRubyMethod(required = 1, optional = 1)
    public IRubyObject initialize(IRubyObject[] args) {
        IRubyObject type = args[0];
        IRubyObject data = getRuntime().getNil();
        if (args.length > 1) {
            data = args[1];
        }
         = type.toString();
         = getDigest(getRuntime());
        if (!data.isNil()) {
            update(data.convertToString());
        }
        return this;
    }
    @Override
    public IRubyObject initialize_copy(IRubyObject obj) {
        checkFrozen();
        if(this == obj) {
            return this;
        }
         = ((Digest)obj)..getAlgorithm();
        try {
             = (MessageDigest)((Digest)obj)..clone();
        } catch(CloneNotSupportedException e) {
            throw getRuntime().newTypeError("Could not initialize copy of digest (" +  + ")");
        }
        return this;
    }
    @JRubyMethod(name={"update","<<"})
    public IRubyObject update(IRubyObject obj) {
        ByteList bytes = obj.convertToString().getByteList();
        .update(bytes.getUnsafeBytes(), bytes.getBegin(), bytes.getRealSize());
        return this;
    }
    public IRubyObject reset() {
        .reset();
        return this;
    }
    public IRubyObject finish() {
        IRubyObject digest = RubyString.newStringNoCopy(getRuntime(), .digest());
        .reset();
        return digest;
    }
    public IRubyObject name() {
        return getRuntime().newString();
    }
    @JRubyMethod()
    public IRubyObject digest_length() {
        return RubyFixnum.newFixnum(getRuntime(), .getDigestLength());
    }
    @JRubyMethod()
    public IRubyObject block_length() {
        // TODO: ruby-openssl supports it.
        throw getRuntime().newRuntimeError(
                this.getMetaClass() + " doesn't implement block_length()");
    }
    String getAlgorithm() {
        return this..getAlgorithm();
    }
        return getAlgorithm().replace("-""");
    }
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