001package org.apache.commons.ssl.org.bouncycastle.asn1.cms; 002 003import org.apache.commons.ssl.org.bouncycastle.asn1.ASN1EncodableVector; 004import org.apache.commons.ssl.org.bouncycastle.asn1.ASN1Integer; 005import org.apache.commons.ssl.org.bouncycastle.asn1.ASN1Object; 006import org.apache.commons.ssl.org.bouncycastle.asn1.ASN1Primitive; 007import org.apache.commons.ssl.org.bouncycastle.asn1.ASN1Sequence; 008import org.apache.commons.ssl.org.bouncycastle.asn1.ASN1TaggedObject; 009import org.apache.commons.ssl.org.bouncycastle.asn1.BERSequence; 010import org.apache.commons.ssl.org.bouncycastle.asn1.x509.AlgorithmIdentifier; 011 012/** 013 * <a href="http://tools.ietf.org/html/rfc3274">RFC 3274</a>: CMS Compressed Data. 014 * 015 * <pre> 016 * CompressedData ::= SEQUENCE { 017 * version CMSVersion, 018 * compressionAlgorithm CompressionAlgorithmIdentifier, 019 * encapContentInfo EncapsulatedContentInfo 020 * } 021 * </pre> 022 */ 023public class CompressedData 024 extends ASN1Object 025{ 026 private ASN1Integer version; 027 private AlgorithmIdentifier compressionAlgorithm; 028 private ContentInfo encapContentInfo; 029 030 public CompressedData( 031 AlgorithmIdentifier compressionAlgorithm, 032 ContentInfo encapContentInfo) 033 { 034 this.version = new ASN1Integer(0); 035 this.compressionAlgorithm = compressionAlgorithm; 036 this.encapContentInfo = encapContentInfo; 037 } 038 039 private CompressedData( 040 ASN1Sequence seq) 041 { 042 this.version = (ASN1Integer)seq.getObjectAt(0); 043 this.compressionAlgorithm = AlgorithmIdentifier.getInstance(seq.getObjectAt(1)); 044 this.encapContentInfo = ContentInfo.getInstance(seq.getObjectAt(2)); 045 } 046 047 /** 048 * Return a CompressedData object from a tagged object. 049 * 050 * @param ato the tagged object holding the object we want. 051 * @param isExplicit true if the object is meant to be explicitly 052 * tagged false otherwise. 053 * @exception IllegalArgumentException if the object held by the 054 * tagged object cannot be converted. 055 */ 056 public static CompressedData getInstance( 057 ASN1TaggedObject ato, 058 boolean isExplicit) 059 { 060 return getInstance(ASN1Sequence.getInstance(ato, isExplicit)); 061 } 062 063 /** 064 * Return a CompressedData object from the given object. 065 * <p> 066 * Accepted inputs: 067 * <ul> 068 * <li> null → null 069 * <li> {@link CompressedData} object 070 * <li> {@link org.bouncycastle.asn1.ASN1Sequence#getInstance(java.lang.Object) ASN1Sequence} input formats with CompressedData structure inside 071 * </ul> 072 * 073 * @param obj the object we want converted. 074 * @exception IllegalArgumentException if the object cannot be converted. 075 */ 076 public static CompressedData getInstance( 077 Object obj) 078 { 079 if (obj instanceof CompressedData) 080 { 081 return (CompressedData)obj; 082 } 083 084 if (obj != null) 085 { 086 return new CompressedData(ASN1Sequence.getInstance(obj)); 087 } 088 089 return null; 090 } 091 092 public ASN1Integer getVersion() 093 { 094 return version; 095 } 096 097 public AlgorithmIdentifier getCompressionAlgorithmIdentifier() 098 { 099 return compressionAlgorithm; 100 } 101 102 public ContentInfo getEncapContentInfo() 103 { 104 return encapContentInfo; 105 } 106 107 public ASN1Primitive toASN1Primitive() 108 { 109 ASN1EncodableVector v = new ASN1EncodableVector(); 110 111 v.add(version); 112 v.add(compressionAlgorithm); 113 v.add(encapContentInfo); 114 115 return new BERSequence(v); 116 } 117}