diff options
| author | Aaron M. Renn <arenn@urbanophile.com> | 1999-07-18 21:36:51 +0000 |
|---|---|---|
| committer | Aaron M. Renn <arenn@urbanophile.com> | 1999-07-18 21:36:51 +0000 |
| commit | 11a56217114c8a391aa3d8bd274df8553d03633f (patch) | |
| tree | 3ca4754241e8759062da193168ff13c0b9c752c3 /gnu/java/security/provider/DERReader.java | |
| parent | e9364fcf79b57d3c4f373ba618eea9ae9c022e13 (diff) | |
| download | classpath-11a56217114c8a391aa3d8bd274df8553d03633f.tar.gz | |
Initial checkin of Mark Benvenuto's security code
Diffstat (limited to 'gnu/java/security/provider/DERReader.java')
| -rw-r--r-- | gnu/java/security/provider/DERReader.java | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/gnu/java/security/provider/DERReader.java b/gnu/java/security/provider/DERReader.java new file mode 100644 index 000000000..66645e69e --- /dev/null +++ b/gnu/java/security/provider/DERReader.java @@ -0,0 +1,115 @@ +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;
+}
+
+}
|