DerValue (kona-crypto 1.0.4 API)

java.lang.Object
- com.tencent.kona.sun.security.util.DerValue

```
public class DerValue
extends java.lang.Object
```
Represents a single DER-encoded value. DER encoding rules are a subset of the "Basic" Encoding Rules (BER), but they only support a single way ("Definite" encoding) to encode any given value.
All DER-encoded data are triples {type, length, data}. This class represents such tagged values as they have been read (or constructed), and provides structured access to the encoded data.
At this time, this class supports only a subset of the types of DER data encodings which are defined. That subset is sufficient for parsing most X.509 certificates, and working with selected additional formats (such as PKCS #10 certificate requests, and some kinds of PKCS #7 data). A note with respect to T61/Teletex strings: From RFC 1617, section 4.1.3 and RFC 5280, section 8, we assume that this kind of string will contain ISO-8859-1 characters only.

Field Summary

Fields
Modifier and Type	Field and Description
`DerInputStream`	`data`
`byte`	`tag`
`static byte`	`TAG_APPLICATION`
`static byte`	`tag_BitString` Tag value indicating an ASN.1 "BIT STRING" value.
`static byte`	`tag_BMPString` Tag value indicating an ASN.1 "BMPString" value.
`static byte`	`tag_Boolean` Tag value indicating an ASN.1 "BOOLEAN" value.
`static byte`	`TAG_CONTEXT`
`static byte`	`tag_Enumerated` Tag value including an ASN.1 "ENUMERATED" value
`static byte`	`tag_GeneralizedTime` Tag value indicating an ASN.1 "GeneralizedTime" value.
`static byte`	`tag_GeneralString` Tag value indicating an ASN.1 "GeneralString" value.
`static byte`	`tag_IA5String` Tag value including an ASCII string
`static byte`	`tag_Integer` Tag value indicating an ASN.1 "INTEGER" value.
`static byte`	`tag_Null` Tag value indicating an ASN.1 "NULL" value.
`static byte`	`tag_ObjectId` Tag value indicating an ASN.1 "OBJECT IDENTIFIER" value.
`static byte`	`tag_OctetString` Tag value indicating an ASN.1 "OCTET STRING" value.
`static byte`	`tag_PrintableString` Tag value including a "printable" string
`static byte`	`TAG_PRIVATE`
`static byte`	`tag_Sequence` Tag value indicating an ASN.1 "SEQUENCE" (zero to N elements, order is significant).
`static byte`	`tag_SequenceOf` Tag value indicating an ASN.1 "SEQUENCE OF" (one to N elements, order is significant).
`static byte`	`tag_Set` Tag value indicating an ASN.1 "SET" (zero to N members, order does not matter).
`static byte`	`tag_SetOf` Tag value indicating an ASN.1 "SET OF" (one to N members, order does not matter).
`static byte`	`tag_T61String` Tag value including a "teletype" string
`static byte`	`TAG_UNIVERSAL` The tag class types
`static byte`	`tag_UniversalString` Tag value indicating an ASN.1 "UniversalString" value.
`static byte`	`tag_UtcTime` Tag value indicating an ASN.1 "UTCTime" value.
`static byte`	`tag_UTF8String` Tag value indicating an ASN.1 "UTF8String" value.

Constructor Summary

Constructors
Constructor and Description
`DerValue(byte[] encoding)` Parse an ASN.1/BER encoded datum.
`DerValue(byte tag, byte[] buffer)` Creates a DerValue from a tag and some DER-encoded data.
`DerValue(byte stringTag, java.lang.String value)` Creates a string type DER value from a String object
`DerValue(java.io.InputStream in)` Get an ASN1/DER encoded datum from an input stream.
`DerValue(java.lang.String value)` Creates a PrintableString or UTF8string DER value from a string.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`void`	`clear()`
`static byte`	`createTag(byte tagClass, boolean form, byte val)` Create the tag of the attribute.
`DerInputStream`	`data()` Returns a new DerInputStream pointing at the start of this DerValue's content.
`void`	`encode(DerOutputStream out)` Encode an ASN1/DER encoded datum onto a DER output stream.
`boolean`	`equals(java.lang.Object o)` Bitwise equality comparison.
`java.lang.String`	`getAsString()` Returns the name component as a Java string, regardless of its encoding restrictions (ASCII, T61, Printable, IA5, BMP, UTF8).
`java.math.BigInteger`	`getBigInteger()` Returns an ASN.1 INTEGER value as a BigInteger.
`byte[]`	`getBitString()` Returns an ASN.1 BIT STRING value.
`byte[]`	`getBitString(boolean tagImplicit)` Returns an ASN.1 BIT STRING value, with the tag assumed implicit based on the parameter.
`java.lang.String`	`getBMPString()` Returns the ASN.1 BMP (Unicode) STRING value as a Java string.
`boolean`	`getBoolean()` Returns an ASN.1 BOOLEAN
`DerInputStream`	`getData()` Returns the data field inside this class directly.
`byte[]`	`getDataBytes()` Helper routine to return all the bytes contained in the DerInputStream associated with this object.
`int`	`getEnumerated()` Returns an ASN.1 ENUMERATED value.
`java.util.Date`	`getGeneralizedTime()` Returns a Date if the DerValue is GeneralizedTime.
`java.lang.String`	`getGeneralString()` Returns the ASN.1 GENERAL STRING value as a Java String.
`java.lang.String`	`getIA5String()` Returns an ASN.1 IA5 (ASCII) STRING value
`int`	`getInteger()` Returns an ASN.1 INTEGER value as an integer.
`void`	`getNull()` Reads the ASN.1 NULL value
`byte[]`	`getOctetString()` Returns an ASN.1 OCTET STRING
`ObjectIdentifier`	`getOID()` Returns an ASN.1 OBJECT IDENTIFIER.
`java.math.BigInteger`	`getPositiveBigInteger()` Returns an ASN.1 INTEGER value as a positive BigInteger.
`java.lang.String`	`getPrintableString()` Returns an ASN.1 STRING value
`java.lang.String`	`getT61String()` Returns an ASN.1 T61 (Teletype) STRING value
`byte`	`getTag()`
`BitArray`	`getUnalignedBitString()` Returns an ASN.1 BIT STRING value that need not be byte-aligned.
`BitArray`	`getUnalignedBitString(boolean tagImplicit)` Returns an ASN.1 BIT STRING value, with the tag assumed implicit based on the parameter.
`java.lang.String`	`getUniversalString()` Returns the ASN.1 UNIVERSAL (UTF-32) STRING value as a Java String.
`java.util.Date`	`getUTCTime()` Returns a Date if the DerValue is UtcTime.
`java.lang.String`	`getUTF8String()` Returns the ASN.1 UTF-8 STRING value as a Java String.
`int`	`hashCode()` Returns a hashcode for this DerValue.
`boolean`	`isApplication()` Returns true if the tag class is APPLICATION.
`boolean`	`isConstructed()` Returns true iff the CONSTRUCTED bit is set in the type tag.
`boolean`	`isConstructed(byte constructedTag)` Returns true iff the CONSTRUCTED TAG matches the passed tag.
`boolean`	`isContextSpecific()` Returns true iff the CONTEXT SPECIFIC bit is set in the type tag.
`boolean`	`isContextSpecific(byte cntxtTag)` Returns true iff the CONTEXT SPECIFIC TAG matches the passed tag.
`static boolean`	`isPrintableStringChar(char ch)` Determine if a character is one of the permissible characters for PrintableString: A-Z, a-z, 0-9, space, apostrophe (39), left and right parentheses, plus sign, comma, hyphen, period, slash, colon, equals sign, and question mark.
`boolean`	`isUniversal()` Returns true if the tag class is UNIVERSAL.
`int`	`length()` Get the length of the encoded value.
`void`	`resetTag(byte tag)` Set the tag of the attribute.
`DerValue[]`	`subs(byte expectedTag, int startLen)` Reads the sub-values in a constructed DerValue.
`byte[]`	`toByteArray()` Returns a DER-encoded value, such that if it's passed to the DerValue constructor, a value equivalent to "this" is returned.
`DerInputStream`	`toDerInputStream()` For "set" and "sequence" types, this function may be used to return a DER stream of the members of the set or sequence.
`java.lang.String`	`toString()` Returns a printable representation of the value.
`DerValue`	`withTag(byte newTag)` Returns a new DerValue with a different tag.
`static DerValue`	`wrap(byte[] buf)` Wraps a byte array as a single DerValue.
`static DerValue`	`wrap(byte[] buf, int offset, int len)` Wraps a byte array as a single DerValue.
`static DerValue`	`wrap(byte tag, DerOutputStream out)` Wraps a DerOutputStream.

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

- Field Detail
  - TAG_UNIVERSAL
```
public static final byte TAG_UNIVERSAL
```
    The tag class types
    
    See Also:
    
    Constant Field Values
  - TAG_APPLICATION
```
public static final byte TAG_APPLICATION
```
    See Also:
    
    Constant Field Values
  - TAG_CONTEXT
```
public static final byte TAG_CONTEXT
```
    See Also:
    
    Constant Field Values
  - TAG_PRIVATE
```
public static final byte TAG_PRIVATE
```
    See Also:
    
    Constant Field Values
  - tag_Boolean
```
public static final byte tag_Boolean
```
    Tag value indicating an ASN.1 "BOOLEAN" value.
    
    See Also:
    
    Constant Field Values
  - tag_Integer
```
public static final byte tag_Integer
```
    Tag value indicating an ASN.1 "INTEGER" value.
    
    See Also:
    
    Constant Field Values
  - tag_BitString
```
public static final byte tag_BitString
```
    Tag value indicating an ASN.1 "BIT STRING" value.
    
    See Also:
    
    Constant Field Values
  - tag_OctetString
```
public static final byte tag_OctetString
```
    Tag value indicating an ASN.1 "OCTET STRING" value.
    
    See Also:
    
    Constant Field Values
  - tag_Null
```
public static final byte tag_Null
```
    Tag value indicating an ASN.1 "NULL" value.
    
    See Also:
    
    Constant Field Values
  - tag_ObjectId
```
public static final byte tag_ObjectId
```
    Tag value indicating an ASN.1 "OBJECT IDENTIFIER" value.
    
    See Also:
    
    Constant Field Values
  - tag_Enumerated
```
public static final byte tag_Enumerated
```
    Tag value including an ASN.1 "ENUMERATED" value
    
    See Also:
    
    Constant Field Values
  - tag_UTF8String
```
public static final byte tag_UTF8String
```
    Tag value indicating an ASN.1 "UTF8String" value.
    
    See Also:
    
    Constant Field Values
  - tag_PrintableString
```
public static final byte tag_PrintableString
```
    Tag value including a "printable" string
    
    See Also:
    
    Constant Field Values
  - tag_T61String
```
public static final byte tag_T61String
```
    Tag value including a "teletype" string
    
    See Also:
    
    Constant Field Values
  - tag_IA5String
```
public static final byte tag_IA5String
```
    Tag value including an ASCII string
    
    See Also:
    
    Constant Field Values
  - tag_UtcTime
```
public static final byte tag_UtcTime
```
    Tag value indicating an ASN.1 "UTCTime" value.
    
    See Also:
    
    Constant Field Values
  - tag_GeneralizedTime
```
public static final byte tag_GeneralizedTime
```
    Tag value indicating an ASN.1 "GeneralizedTime" value.
    
    See Also:
    
    Constant Field Values
  - tag_GeneralString
```
public static final byte tag_GeneralString
```
    Tag value indicating an ASN.1 "GeneralString" value.
    
    See Also:
    
    Constant Field Values
  - tag_UniversalString
```
public static final byte tag_UniversalString
```
    Tag value indicating an ASN.1 "UniversalString" value.
    
    See Also:
    
    Constant Field Values
  - tag_BMPString
```
public static final byte tag_BMPString
```
    Tag value indicating an ASN.1 "BMPString" value.
    
    See Also:
    
    Constant Field Values
  - tag_Sequence
```
public static final byte tag_Sequence
```
    Tag value indicating an ASN.1 "SEQUENCE" (zero to N elements, order is significant).
    
    See Also:
    
    Constant Field Values
  - tag_SequenceOf
```
public static final byte tag_SequenceOf
```
    Tag value indicating an ASN.1 "SEQUENCE OF" (one to N elements, order is significant).
    
    See Also:
    
    Constant Field Values
  - tag_Set
```
public static final byte tag_Set
```
    Tag value indicating an ASN.1 "SET" (zero to N members, order does not matter).
    
    See Also:
    
    Constant Field Values
  - tag_SetOf
```
public static final byte tag_SetOf
```
    Tag value indicating an ASN.1 "SET OF" (one to N members, order does not matter).
    
    See Also:
    
    Constant Field Values
  - tag
```
public byte tag
```
  - data
```
public final DerInputStream data
```
- Constructor Detail
  - DerValue
```
public DerValue(java.lang.String value)
```
    Creates a PrintableString or UTF8string DER value from a string.
  - DerValue
```
public DerValue(byte stringTag,
                java.lang.String value)
```
    Creates a string type DER value from a String object
    
    Parameters:
    
    stringTag - the tag for the DER value to create
    
    value - the String object to use for the DER value
  - DerValue
```
public DerValue(byte tag,
                byte[] buffer)
```
    Creates a DerValue from a tag and some DER-encoded data. This is a public constructor.
    
    Parameters:
    
    tag - the DER type tag
    
    buffer - the DER-encoded data
  - DerValue
```
public DerValue(byte[] encoding)
         throws java.io.IOException
```
    Parse an ASN.1/BER encoded datum. The entire encoding must hold exactly one datum, including its tag and length. This is a public constructor.
    
    Throws:
    
    java.io.IOException
  - DerValue
```
public DerValue(java.io.InputStream in)
         throws java.io.IOException
```
    Get an ASN1/DER encoded datum from an input stream. The stream may have additional data following the encoded datum. In case of indefinite length encoded datum, the input stream must hold only one datum, i.e. all bytes in the stream might be consumed. Otherwise, only one DerValue will be consumed.
    
    Parameters:
    
    in - the input stream holding a single DER datum, which may be followed by additional data
    
    Throws:
    
    java.io.IOException
- Method Detail
  - isUniversal
```
public boolean isUniversal()
```
    Returns true if the tag class is UNIVERSAL.
  - isApplication
```
public boolean isApplication()
```
    Returns true if the tag class is APPLICATION.
  - isContextSpecific
```
public boolean isContextSpecific()
```
    Returns true iff the CONTEXT SPECIFIC bit is set in the type tag. This is associated with the ASN.1 "DEFINED BY" syntax.
  - isContextSpecific
```
public boolean isContextSpecific(byte cntxtTag)
```
    Returns true iff the CONTEXT SPECIFIC TAG matches the passed tag.
  - isConstructed
```
public boolean isConstructed()
```
    Returns true iff the CONSTRUCTED bit is set in the type tag.
  - isConstructed
```
public boolean isConstructed(byte constructedTag)
```
    Returns true iff the CONSTRUCTED TAG matches the passed tag.
  - wrap
```
public static DerValue wrap(byte tag,
                            DerOutputStream out)
```
    Wraps a DerOutputStream. All bytes currently written into the stream will become the content of the newly created DerValue. Attention: do not reset the DerOutputStream after this call. No array copying is made.
    
    Parameters:
    
    tag - the tag
    
    out - the DerOutputStream
    
    Returns:
    
    a new DerValue using out as its content
  - wrap
```
public static DerValue wrap(byte[] buf)
                     throws java.io.IOException
```
    Wraps a byte array as a single DerValue. Attention: no cloning is made.
    
    Parameters:
    
    buf - the byte array containing the DER-encoded datum
    
    Returns:
    
    a new DerValue
    
    Throws:
    
    java.io.IOException
  - wrap
```
public static DerValue wrap(byte[] buf,
                            int offset,
                            int len)
                     throws java.io.IOException
```
    Wraps a byte array as a single DerValue. Attention: no cloning is made.
    
    Parameters:
    
    buf - the byte array containing the DER-encoded datum
    
    offset - where the encoded datum starts inside buf
    
    len - length of bytes to parse inside buf
    
    Returns:
    
    a new DerValue
    
    Throws:
    
    java.io.IOException
  - encode
```
public void encode(DerOutputStream out)
            throws java.io.IOException
```
    Encode an ASN1/DER encoded datum onto a DER output stream.
    
    Throws:
    
    java.io.IOException
  - data
```
public final DerInputStream data()
```
    Returns a new DerInputStream pointing at the start of this DerValue's content.
    
    Returns:
    
    the new DerInputStream value
  - getData
```
public final DerInputStream getData()
```
    Returns the data field inside this class directly. Both this method and the data field should be avoided. Consider using data() instead.
  - getTag
```
public final byte getTag()
```
  - getBoolean
```
public boolean getBoolean()
                   throws java.io.IOException
```
    Returns an ASN.1 BOOLEAN
    
    Returns:
    
    the boolean held in this DER value
    
    Throws:
    
    java.io.IOException
  - getOID
```
public ObjectIdentifier getOID()
                        throws java.io.IOException
```
    Returns an ASN.1 OBJECT IDENTIFIER.
    
    Returns:
    
    the OID held in this DER value
    
    Throws:
    
    java.io.IOException
  - getOctetString
```
public byte[] getOctetString()
                      throws java.io.IOException
```
    Returns an ASN.1 OCTET STRING
    
    Returns:
    
    the octet string held in this DER value
    
    Throws:
    
    java.io.IOException
  - getInteger
```
public int getInteger()
               throws java.io.IOException
```
    Returns an ASN.1 INTEGER value as an integer.
    
    Returns:
    
    the integer held in this DER value.
    
    Throws:
    
    java.io.IOException
  - getBigInteger
```
public java.math.BigInteger getBigInteger()
                                   throws java.io.IOException
```
    Returns an ASN.1 INTEGER value as a BigInteger.
    
    Returns:
    
    the integer held in this DER value as a BigInteger.
    
    Throws:
    
    java.io.IOException
  - getPositiveBigInteger
```
public java.math.BigInteger getPositiveBigInteger()
                                           throws java.io.IOException
```
    Returns an ASN.1 INTEGER value as a positive BigInteger. This is just to deal with implementations that incorrectly encode some values as negative.
    
    Returns:
    
    the integer held in this DER value as a BigInteger.
    
    Throws:
    
    java.io.IOException
  - getEnumerated
```
public int getEnumerated()
                  throws java.io.IOException
```
    Returns an ASN.1 ENUMERATED value.
    
    Returns:
    
    the integer held in this DER value.
    
    Throws:
    
    java.io.IOException
  - getBitString
```
public byte[] getBitString()
                    throws java.io.IOException
```
    Returns an ASN.1 BIT STRING value. The bit string must be byte-aligned.
    
    Returns:
    
    the bit string held in this value
    
    Throws:
    
    java.io.IOException
  - getUnalignedBitString
```
public BitArray getUnalignedBitString()
                               throws java.io.IOException
```
    Returns an ASN.1 BIT STRING value that need not be byte-aligned.
    
    Returns:
    
    a BitArray representing the bit string held in this value
    
    Throws:
    
    java.io.IOException
  - getAsString
```
public java.lang.String getAsString()
                             throws java.io.IOException
```
    Returns the name component as a Java string, regardless of its encoding restrictions (ASCII, T61, Printable, IA5, BMP, UTF8).
    
    Throws:
    
    java.io.IOException
  - getBitString
```
public byte[] getBitString(boolean tagImplicit)
                    throws java.io.IOException
```
    Returns an ASN.1 BIT STRING value, with the tag assumed implicit based on the parameter. The bit string must be byte-aligned.
    
    Parameters:
    
    tagImplicit - if true, the tag is assumed implicit.
    
    Returns:
    
    the bit string held in this value
    
    Throws:
    
    java.io.IOException
  - getUnalignedBitString
```
public BitArray getUnalignedBitString(boolean tagImplicit)
                               throws java.io.IOException
```
    Returns an ASN.1 BIT STRING value, with the tag assumed implicit based on the parameter. The bit string need not be byte-aligned.
    
    Parameters:
    
    tagImplicit - if true, the tag is assumed implicit.
    
    Returns:
    
    the bit string held in this value
    
    Throws:
    
    java.io.IOException
  - getDataBytes
```
public byte[] getDataBytes()
                    throws java.io.IOException
```
    Helper routine to return all the bytes contained in the DerInputStream associated with this object.
    
    Throws:
    
    java.io.IOException
  - getPrintableString
```
public java.lang.String getPrintableString()
                                    throws java.io.IOException
```
    Returns an ASN.1 STRING value
    
    Returns:
    
    the printable string held in this value
    
    Throws:
    
    java.io.IOException
  - getT61String
```
public java.lang.String getT61String()
                              throws java.io.IOException
```
    Returns an ASN.1 T61 (Teletype) STRING value
    
    Returns:
    
    the teletype string held in this value
    
    Throws:
    
    java.io.IOException
  - getIA5String
```
public java.lang.String getIA5String()
                              throws java.io.IOException
```
    Returns an ASN.1 IA5 (ASCII) STRING value
    
    Returns:
    
    the ASCII string held in this value
    
    Throws:
    
    java.io.IOException
  - getBMPString
```
public java.lang.String getBMPString()
                              throws java.io.IOException
```
    Returns the ASN.1 BMP (Unicode) STRING value as a Java string.
    
    Returns:
    
    a string corresponding to the encoded BMPString held in this value
    
    Throws:
    
    java.io.IOException
  - getUTF8String
```
public java.lang.String getUTF8String()
                               throws java.io.IOException
```
    Returns the ASN.1 UTF-8 STRING value as a Java String.
    
    Returns:
    
    a string corresponding to the encoded UTF8String held in this value
    
    Throws:
    
    java.io.IOException
  - getGeneralString
```
public java.lang.String getGeneralString()
                                  throws java.io.IOException
```
    Returns the ASN.1 GENERAL STRING value as a Java String.
    
    Returns:
    
    a string corresponding to the encoded GeneralString held in this value
    
    Throws:
    
    java.io.IOException
  - getUniversalString
```
public java.lang.String getUniversalString()
                                    throws java.io.IOException
```
    Returns the ASN.1 UNIVERSAL (UTF-32) STRING value as a Java String.
    
    Returns:
    
    a string corresponding to the encoded UniversalString held in this value
    
    Throws:
    
    java.io.IOException
  - getNull
```
public void getNull()
             throws java.io.IOException
```
    Reads the ASN.1 NULL value
    
    Throws:
    
    java.io.IOException
  - getUTCTime
```
public java.util.Date getUTCTime()
                          throws java.io.IOException
```
    Returns a Date if the DerValue is UtcTime.
    
    Returns:
    
    the Date held in this DER value
    
    Throws:
    
    java.io.IOException
  - getGeneralizedTime
```
public java.util.Date getGeneralizedTime()
                                  throws java.io.IOException
```
    Returns a Date if the DerValue is GeneralizedTime.
    
    Returns:
    
    the Date held in this DER value
    
    Throws:
    
    java.io.IOException
  - equals
```
public boolean equals(java.lang.Object o)
```
    Bitwise equality comparison. DER encoded values have a single encoding, so that bitwise equality of the encoded values is an efficient way to establish equivalence of the unencoded values.
    
    Overrides:
    
    equals in class java.lang.Object
    
    Parameters:
    
    o - the object being compared with this one
  - toString
```
public java.lang.String toString()
```
    Returns a printable representation of the value.
    
    Overrides:
    
    toString in class java.lang.Object
    
    Returns:
    
    printable representation of the value
  - toByteArray
```
public byte[] toByteArray()
                   throws java.io.IOException
```
    Returns a DER-encoded value, such that if it's passed to the DerValue constructor, a value equivalent to "this" is returned.
    
    Returns:
    
    DER-encoded value, including tag and length.
    
    Throws:
    
    java.io.IOException
  - toDerInputStream
```
public DerInputStream toDerInputStream()
                                throws java.io.IOException
```
    For "set" and "sequence" types, this function may be used to return a DER stream of the members of the set or sequence. This operation is not supported for primitive types such as integers or bit strings.
    
    Throws:
    
    java.io.IOException
  - length
```
public int length()
```
    Get the length of the encoded value.
  - isPrintableStringChar
```
public static boolean isPrintableStringChar(char ch)
```
    Determine if a character is one of the permissible characters for PrintableString: A-Z, a-z, 0-9, space, apostrophe (39), left and right parentheses, plus sign, comma, hyphen, period, slash, colon, equals sign, and question mark. Characters that are *not* allowed in PrintableString include exclamation point, quotation mark, number sign, dollar sign, percent sign, ampersand, asterisk, semicolon, less than sign, greater than sign, at sign, left and right square brackets, backslash, circumflex (94), underscore, back quote (96), left and right curly brackets, vertical line, tilde, and the control codes (0-31 and 127). This list is based on X.680 (the ASN.1 spec).
  - createTag
```
public static byte createTag(byte tagClass,
                             boolean form,
                             byte val)
```
    Create the tag of the attribute.
    
    Parameters:
    
    tagClass - the tag class type, one of UNIVERSAL, CONTEXT, APPLICATION or PRIVATE
    
    form - if true, the value is constructed, otherwise it is primitive.
    
    val - the tag value
  - resetTag
```
public void resetTag(byte tag)
```
    Set the tag of the attribute. Commonly used to reset the tag value used for IMPLICIT encodings. This method should be avoided, consider using withTag() instead.
    
    Parameters:
    
    tag - the tag value
  - withTag
```
public DerValue withTag(byte newTag)
```
    Returns a new DerValue with a different tag. This method is used to convert a DerValue decoded from an IMPLICIT encoding to its real tag. The content is not checked against the tag in this method.
    
    Parameters:
    
    newTag - the new tag
    
    Returns:
    
    a new DerValue
  - hashCode
```
public int hashCode()
```
    Returns a hashcode for this DerValue.
    
    Overrides:
    
    hashCode in class java.lang.Object
    
    Returns:
    
    a hashcode for this DerValue.
  - subs
```
public DerValue[] subs(byte expectedTag,
                       int startLen)
                throws java.io.IOException
```
    Reads the sub-values in a constructed DerValue.
    
    Parameters:
    
    expectedTag - the expected tag, or zero if we don't check. This is useful when this DerValue is IMPLICIT.
    
    startLen - estimated number of sub-values
    
    Returns:
    
    the sub-values in an array
    
    Throws:
    
    java.io.IOException
  - clear
```
public void clear()
```

Class DerValue

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

TAG_UNIVERSAL

TAG_APPLICATION

TAG_CONTEXT

TAG_PRIVATE

tag_Boolean

tag_Integer

tag_BitString

tag_OctetString

tag_Null

tag_ObjectId

tag_Enumerated

tag_UTF8String

tag_PrintableString

tag_T61String

tag_IA5String

tag_UtcTime

tag_GeneralizedTime

tag_GeneralString

tag_UniversalString

tag_BMPString

tag_Sequence

tag_SequenceOf

tag_Set

tag_SetOf

tag

data

Constructor Detail

DerValue

DerValue

DerValue

DerValue

DerValue

Method Detail

isUniversal

isApplication

isContextSpecific

isContextSpecific

isConstructed

isConstructed

wrap

wrap

wrap

encode

data

getData

getTag

getBoolean

getOID

getOctetString

getInteger

getBigInteger

getPositiveBigInteger

getEnumerated

getBitString

getUnalignedBitString

getAsString

getBitString

getUnalignedBitString

getDataBytes

getPrintableString

getT61String

getIA5String

getBMPString

getUTF8String

getGeneralString

getUniversalString

getNull

getUTCTime

getGeneralizedTime

equals

toString

toByteArray

toDerInputStream

length