Package 

Class Asn1Utils

    • Method Summary

      Modifier and Type Method Description
      static int hexCharToInt(char c)
      static Array<byte> hexStringToBytes(String s) Converts a hex String to a byte array.
      static String bytesToHexString(Array<byte> bytes) Converts a byte array into a String of hexadecimal characters.
      static int bytesToInt(Array<byte> src, int offset, int length) Converts a series of bytes to an integer.
      static long bytesToRawLong(Array<byte> src, int offset, int length) Converts a series of bytes to a raw long variable which can be both positive and negative.This method currently only supports 64-bit long variable.
      static Array<byte> unsignedIntToBytes(int value) Converts an integer to a new byte array with base 256 and the most significant digit first.
      static Array<byte> signedIntToBytes(int value) Converts an integer to a new byte array with base 256 and the most significant digit first.The first byte's highest bit is used for sign.
      static int unsignedIntToBytes(int value, Array<byte> dest, int offset) Converts an integer to a series of bytes with base 256 and the most significant digit first.
      static int signedIntToBytes(int value, Array<byte> dest, int offset) Converts an integer to a series of bytes with base 256 and the most significant digit first.The first byte's highest bit is used for sign.
      static int byteNumForUnsignedInt(int value) Calculates the number of required bytes to represent {@code value}.
      static int byteNumForSignedInt(int value) Calculates the number of required bytes to represent {@code value}.
      static byte countTrailingZeros(byte b) Counts the number of trailing zero bits of a byte.
      static String byteToHex(byte b) Converts a byte to a hex string.

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Method Detail

      • hexStringToBytes

         static Array<byte> hexStringToBytes(String s)

        Converts a hex String to a byte array.

        Parameters:
        s - A string of hexadecimal characters, must be an even number ofchars long

      • bytesToHexString

         static String bytesToHexString(Array<byte> bytes)

        Converts a byte array into a String of hexadecimal characters.

        Parameters:
        bytes - an array of bytes

      • bytesToInt

         static int bytesToInt(Array<byte> src, int offset, int length)

        Converts a series of bytes to an integer. This method currently only supports positive 32-bitintegers.

        Parameters:
        src - The source bytes.
        offset - The position of the first byte of the data to be converted.
        length - The length of the data to be converted.

      • bytesToRawLong

         static long bytesToRawLong(Array<byte> src, int offset, int length)

        Converts a series of bytes to a raw long variable which can be both positive and negative.This method currently only supports 64-bit long variable.

        Parameters:
        src - The source bytes.
        offset - The position of the first byte of the data to be converted.
        length - The length of the data to be converted.

      • unsignedIntToBytes

         static Array<byte> unsignedIntToBytes(int value)

        Converts an integer to a new byte array with base 256 and the most significant digit first.

      • signedIntToBytes

         static Array<byte> signedIntToBytes(int value)

        Converts an integer to a new byte array with base 256 and the most significant digit first.The first byte's highest bit is used for sign. If the most significant digit is larger than127, an extra byte (0) will be prepended before it. This method currently doesn't supportnegative values.

      • unsignedIntToBytes

         static int unsignedIntToBytes(int value, Array<byte> dest, int offset)

        Converts an integer to a series of bytes with base 256 and the most significant digit first.

        Parameters:
        value - The integer to be converted.
        dest - The destination byte array.
        offset - The start offset of the byte array.

      • signedIntToBytes

         static int signedIntToBytes(int value, Array<byte> dest, int offset)

        Converts an integer to a series of bytes with base 256 and the most significant digit first.The first byte's highest bit is used for sign. If the most significant digit is larger than127, an extra byte (0) will be prepended before it. This method currently doesn't supportnegative values.

      • byteNumForUnsignedInt

         static int byteNumForUnsignedInt(int value)

        Calculates the number of required bytes to represent {@code value}. The bytes will be base256 with the most significant digit first.

      • byteNumForSignedInt

         static int byteNumForSignedInt(int value)

        Calculates the number of required bytes to represent {@code value}. The bytes will be base256 with the most significant digit first. If the most significant digit is larger than 127,an extra byte (0) will be prepended before it. This method currently only supports positiveintegers.

      • countTrailingZeros

         static byte countTrailingZeros(byte b)

        Counts the number of trailing zero bits of a byte.

      • byteToHex

         static String byteToHex(byte b)

        Converts a byte to a hex string.