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Bouncy Castle Cryptography Library 1.37
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org.bouncycastle.asn1

Class ASN1InputStream

Implemented Interfaces:
DERTags
public class ASN1InputStream
extends FilterInputStream
implements DERTags
a general purpose ASN.1 decoder - note: this class differs from the others in that it returns null after it has read the last object in the stream. If an ASN.1 NULL is encountered a DER/BER Null object is returned.

Fields inherited from interface org.bouncycastle.asn1.DERTags

APPLICATION, BIT_STRING, BMP_STRING, BOOLEAN, CONSTRUCTED, ENUMERATED, EXTERNAL, GENERALIZED_TIME, GENERAL_STRING, GRAPHIC_STRING, IA5_STRING, INTEGER, NULL, NUMERIC_STRING, OBJECT_IDENTIFIER, OCTET_STRING, PRINTABLE_STRING, SEQUENCE, SEQUENCE_OF, SET, SET_OF, T61_STRING, TAGGED, UNIVERSAL_STRING, UTC_TIME, UTF8_STRING, VIDEOTEX_STRING, VISIBLE_STRING

Constructor Summary

ASN1InputStream(InputStream is)
ASN1InputStream(InputStream input, int limit)
Create an ASN1InputStream where no DER object will be longer than limit.
ASN1InputStream(byte[] input)
Create an ASN1InputStream based on the input byte array.

Method Summary

protected DERObject
buildObject(int tag, int tagNo, byte[] bytes)
build an object given its tag and a byte stream to construct it from.
protected void
readFully(byte[] bytes)
protected int
readLength()
DERObject
readObject()

Constructor Details

ASN1InputStream

public ASN1InputStream(InputStream is)

ASN1InputStream

public ASN1InputStream(InputStream input,
                       int limit)
Create an ASN1InputStream where no DER object will be longer than limit.
Parameters:
input - stream containing ASN.1 encoded data.
limit - maximum size of a DER encoded object.

ASN1InputStream

public ASN1InputStream(byte[] input)
Create an ASN1InputStream based on the input byte array. The length of DER objects in the stream is automatically limited to the length of the input array.
Parameters:
input - array containing ASN.1 encoded data.

Method Details

buildObject

protected DERObject buildObject(int tag,
                                int tagNo,
                                byte[] bytes)
            throws IOException
build an object given its tag and a byte stream to construct it from.

readFully

protected void readFully(byte[] bytes)
            throws IOException

readLength

protected int readLength()
            throws IOException

readObject

public DERObject readObject()
            throws IOException

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