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Diffstat (limited to 'libjava/gnu/java/security/provider/DERReader.java')
| -rw-r--r-- | libjava/gnu/java/security/provider/DERReader.java | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/libjava/gnu/java/security/provider/DERReader.java b/libjava/gnu/java/security/provider/DERReader.java new file mode 100644 index 00000000000..0f6e492a5f5 --- /dev/null +++ b/libjava/gnu/java/security/provider/DERReader.java @@ -0,0 +1,152 @@ +/* DERReader.java + Copyright (C) 1999 Free Software Foundation, Inc. + +This file is 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, 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; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA +02111-1307 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.provider; + +import java.math.BigInteger; +import gnu.java.security.der.DEREncodingException; + +public class DERReader +{ + byte source[]; + int pos; + + static final int UNIVERSAL = 1; + static final int APPLICATION = 2; + static final int CONTEXT_SPECIFIC = 3; + static final int PRIVATE = 4; + + + public DERReader() + { + source = null; + pos = 0; + } + + public DERReader( byte source[] ) + { + init( source ); + } + + public void init( String source ) + { + init( source.getBytes() ); + } + + public void init( byte source[] ) + { + this.source = source; + pos = 0; + } + + public BigInteger getBigInteger() throws DEREncodingException + { + return new BigInteger( getPrimitive() ); + } + + //Reads Primitive, definite-length method + private byte[] getPrimitive() throws DEREncodingException + { + int tmp = pos; + + //Read Identifier + byte identifier = source[tmp++]; + if( (0x20 & identifier) != 0) + throw new DEREncodingException(); + int type = translateLeadIdentifierByte(identifier); + //System.out.println("Type: " + type); + + //get tag + int tag = (0x1f & identifier); + //if( tag == 0x1f) + // tag = getIdentifier(tmp); + //System.out.println("Tag: " + tag); + + //get length + byte len = source[tmp]; //may be length of length parameter + long length = 0x7f & len; + int i; + if( (0x80 & len) != 0 ) { + //System.out.println("Extra Long Length"); + len &= 0x7f; + //System.out.println("Length of Length: " + len); + //get length here + length = 0; + for( i = 0; i < len; i++ ) { + tmp++; + length <<= 8; + length += (source[tmp] < 0 ) ? + (256 + source[tmp]) : + source[tmp]; + //System.out.println("Length of Length: " + length); + } + tmp++; + } else + tmp++; + + /*System.out.println("Position: " + tmp); + System.out.println("Length: " + length); + for( i = 0; i < 10; i++) + System.out.print(source[tmp + i] + " "); + System.out.println();*/ + + byte tmpb[] = new byte[ (int)length ]; + System.arraycopy( source, tmp, tmpb, 0, (int)length); + pos = (int)(tmp + length); + return tmpb; + } + + private int translateLeadIdentifierByte(byte b) + { + if( (0x3f & b ) == b) + return UNIVERSAL; + else if( (0x7f & b ) == b) + return APPLICATION; + else if( (0xbf & b ) == b) + return CONTEXT_SPECIFIC; + else + return PRIVATE; + } + + private int getIdentifier(int tpos) + { + while( (0x80 & source[tpos]) != 0) + tpos++; + return tpos; + } +} |
