Class Asn1Parser

java.lang.Object
org.apache.tomcat.util.buf.Asn1Parser
public class Asn1Parser extends Object
This is a very basic ASN.1 parser that provides the limited functionality required by Tomcat. It is a long way from a complete parser.

  • Field Details

    • TAG_INTEGER

      public static final int TAG_INTEGER
      ASN.1 tag for INTEGER type.
      See Also:

    • TAG_OCTET_STRING

      public static final int TAG_OCTET_STRING
      ASN.1 tag for OCTET STRING type.
      See Also:

    • TAG_NULL

      public static final int TAG_NULL
      ASN.1 tag for NULL type.
      See Also:

    • TAG_OID

      public static final int TAG_OID
      ASN.1 tag for OID type.
      See Also:

    • TAG_UTF8STRING

      public static final int TAG_UTF8STRING
      ASN.1 tag for UTF8String type.
      See Also:

    • TAG_SEQUENCE

      public static final int TAG_SEQUENCE
      ASN.1 tag for SEQUENCE type.
      See Also:

    • TAG_ATTRIBUTE_BASE

      public static final int TAG_ATTRIBUTE_BASE
      Base value for ASN.1 context-specific attribute tags.
      See Also:

  • Constructor Details

    • Asn1Parser

      public Asn1Parser(byte[] source)
      Constructs a new Asn1Parser.
      Parameters:
      source - the source byte array to parse

  • Method Details

    • eof

      public boolean eof()
      Returns whether the end of the source data has been reached.
      Returns:
      true if the end of the source data has been reached

    • peekTag

      public int peekTag()
      Returns the next ASN.1 tag byte without advancing the position.
      Returns:
      the next tag byte value

    • parseTagSequence

      public void parseTagSequence()
      Parses a SEQUENCE tag and tracks nesting.

    • parseTag

      public void parseTag(int tag)
      Parses and validates an expected tag.
      Parameters:
      tag - the expected tag value

    • parseFullLength

      public void parseFullLength()
      Validates that the remaining data matches the parsed length.

    • parseLength

      public int parseLength()
      Parses an ASN.1 length field.
      Returns:
      the parsed length value

    • parseInt

      public BigInteger parseInt()
      Parses an INTEGER value.
      Returns:
      the parsed integer as a BigInteger

    • parseOctetString

      public byte[] parseOctetString()
      Parses an OCTET STRING value.
      Returns:
      the parsed octet string bytes

    • parseNull

      public void parseNull()
      Parses a NULL value.

    • parseOIDAsBytes

      public byte[] parseOIDAsBytes()
      Parses an OID value as raw bytes.
      Returns:
      the parsed OID bytes

    • parseUTF8String

      public String parseUTF8String()
      Parses a UTF8String value.
      Returns:
      the parsed UTF-8 string

    • parseAttributeAsBytes

      public byte[] parseAttributeAsBytes(int index)
      Parses a context-specific attribute value as raw bytes.
      Parameters:
      index - the context-specific attribute index
      Returns:
      the parsed attribute bytes

    • parseBytes

      public void parseBytes(byte[] dest)
      Reads raw bytes into the destination array.
      Parameters:
      dest - the destination byte array

    • getNestedSequenceLevel

      public int getNestedSequenceLevel()
      Returns the current nesting level of SEQUENCE tags.
      Returns:
      the number of nested SEQUENCE tags