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KeyAgreeRecipientInfo.java
资源名称：security.rar　[点击查看]
上传用户：lior1029
上传日期：2013-05-07
资源大小：209k
文件大小：4k
源码类别：

CA认证

开发平台：

Java

KeyAgreeRecipientInfo.java：源码内容
  1. package org.bouncycastle.asn1.cms;
  3. import org.bouncycastle.asn1.ASN1OctetString;
  4. import org.bouncycastle.asn1.ASN1Sequence;
  5. import org.bouncycastle.asn1.ASN1TaggedObject;
  6. import org.bouncycastle.asn1.DERSequence;
  7. import org.bouncycastle.asn1.DERTaggedObject;
  8. import org.bouncycastle.asn1.DERObject;
  9. import org.bouncycastle.asn1.DERInteger;
  10. import org.bouncycastle.asn1.DEREncodable;
  11. import org.bouncycastle.asn1.ASN1EncodableVector;
  13. import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
  15. public class KeyAgreeRecipientInfo
  16.     implements DEREncodable
  17. {
  18. private DERInteger                  version;
  19. private OriginatorIdentifierOrKey   originator;
  20. private ASN1OctetString             ukm;
  21. private AlgorithmIdentifier         keyEncryptionAlgorithm;
  22. private ASN1Sequence                recipientEncryptedKeys;
  24. public KeyAgreeRecipientInfo(
  25.         OriginatorIdentifierOrKey   originator,
  26.         ASN1OctetString             ukm,
  27.         AlgorithmIdentifier         keyEncryptionAlgorithm,
  28.         ASN1Sequence                recipientEncryptedKeys)
  29.     {
  30.         this.version = new DERInteger(3);
  31.         this.originator = originator;
  32.         this.ukm = ukm;
  33.         this.keyEncryptionAlgorithm = keyEncryptionAlgorithm;
  34. }
  36. public KeyAgreeRecipientInfo(
  37.         ASN1Sequence seq)
  38.     {
  39. int index = 0;
  41. version = (DERInteger)seq.getObjectAt(index++);
  42.         originator = OriginatorIdentifierOrKey.getInstance(
  43.                             (ASN1TaggedObject)seq.getObjectAt(index++), true);
  45.         if (seq.getObjectAt(index) instanceof ASN1TaggedObject)
  46.         {
  47.             ukm = ASN1OctetString.getInstance(
  48.                             (ASN1TaggedObject)seq.getObjectAt(index++), true);
  49.         }
  51. keyEncryptionAlgorithm = AlgorithmIdentifier.getInstance(
  52.                                                 seq.getObjectAt(index++));
  54. recipientEncryptedKeys = (ASN1Sequence)seq.getObjectAt(index++);
  55. }
  57.     /**
  58.      * return a KeyAgreeRecipientInfo object from a tagged object.
  59.      *
  60.      * @param obj the tagged object holding the object we want.
  61.      * @param explicit true if the object is meant to be explicitly
  62.      *              tagged false otherwise.
  63.      * @exception IllegalArgumentException if the object held by the
  64.      *          tagged object cannot be converted.
  65.      */
  66. public static KeyAgreeRecipientInfo getInstance(
  67.         ASN1TaggedObject    obj,
  68.         boolean             explicit)
  69.     {
  70. return getInstance(ASN1Sequence.getInstance(obj, explicit));
  71. }
  73.     /**
  74.      * return a KeyAgreeRecipientInfo object from the given object.
  75.      *
  76.      * @param obj the object we want converted.
  77.      * @exception IllegalArgumentException if the object cannot be converted.
  78.      */
  79. public static KeyAgreeRecipientInfo getInstance(
  80.         Object obj)
  81.     {
  82. if (obj == null || obj instanceof KeyAgreeRecipientInfo)
  83.         {
  84. return (KeyAgreeRecipientInfo)obj;
  85. }
  87. if (obj instanceof ASN1Sequence)
  88.         {
  89. return new KeyAgreeRecipientInfo((ASN1Sequence)obj);
  90. }
  92. throw new IllegalArgumentException(
  93.         "Illegal object in KeyAgreeRecipientInfo: " + obj.getClass().getName());
  95. } 
  97. public DERInteger getVersion()
  98.     {
  99. return version;
  100. }
  102. public OriginatorIdentifierOrKey getOriginator()
  103.     {
  104. return originator;
  105. }
  107. public ASN1OctetString getUserKeyingMaterial()
  108.     {
  109. return ukm;
  110. }
  112. public AlgorithmIdentifier getKeyEncryptionAlgorithm()
  113.     {
  114. return keyEncryptionAlgorithm;
  115. }
  117. public ASN1Sequence getRecipientEncryptedKeys()
  118.     {
  119. return recipientEncryptedKeys;
  120. }
  122.     /** 
  123.      * <pre>
  124.      * KeyAgreeRecipientInfo ::= SEQUENCE {
  125.      *  version CMSVersion,  -- always set to 3
  126.      *  originator [0] EXPLICIT OriginatorIdentifierOrKey,
  127.      *  ukm [1] EXPLICIT UserKeyingMaterial OPTIONAL,
  128.      *  keyEncryptionAlgorithm KeyEncryptionAlgorithmIdentifier,
  129.      *  recipientEncryptedKeys RecipientEncryptedKeys 
  130.      * }
  131.      * </pre>
  132.      */
  133. public DERObject getDERObject()
  134.     {
  135.         ASN1EncodableVector  v = new ASN1EncodableVector();
  137. v.add(version);
  138. v.add(new DERTaggedObject(true, 0, originator));
  140. if (ukm != null)
  141.         {
  142. v.add(new DERTaggedObject(true, 1, ukm));
  143. }
  145. v.add(keyEncryptionAlgorithm);
  146. v.add(recipientEncryptedKeys);
  148. return new DERSequence(v);
  149. }
  150. }