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package model.asn1;
/**
* Represents the class (UNIVERSAL, APPLICATION, PRIVATE, CONTEXT-SPECIFIC) of an ASN.1 tag. See X.680$8.1.
* The purpose of UNIVERSAL, APPLICATION, PRIVATE, and CONTEXT_SPECIFIC can be found in X.680 spec.
* For example, UNIVERSAL means tags specified in the core ASN.1 spec.
* This class also represents the value to the two highest bits of DER-encoded tag values.
*/
public enum TagClass {
UNIVERSAL(Values.UNIVERSAL),
APPLICATION(Values.APPLICATION),
PRIVATE(Values.PRIVATE),
CONTEXT_SPECIFIC(Values.CONTENT_SPECIFIC);
private final Byte val;
/**
* EFFECT: Constructs the tag class with the given DER tag byte value.
* REQUIRES: The Byte value must have low 6bits cleared.
*/
TagClass(Byte val) {
this.val = val;
}
public Byte getVal() {
return val;
}
/**
* The constants of high-two-bit values for Tag DER encoding.
*/
public static final class Values {
// 0b00000000
public static final Byte UNIVERSAL = 0x0;
// 0b01000000
public static final Byte APPLICATION = 0x40;
// 0b11000000
public static final Byte PRIVATE = -64;
// 0b10000000
public static final Byte CONTENT_SPECIFIC = -128;
}
}
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