Sha256: 2c9f976c6421b1298c40d354dc67e6e2e7894480e74d147358d012fba1b3dda9
Contents?: true
Size: 900 Bytes
Versions: 37
Compression:
Stored size: 900 Bytes
Contents
# -*- coding: binary -*-
module Rex::Text
# XOR a string against a variable-length key
#
# @param key [String] XOR key
# @param value [String] String to XOR
# @return [String] XOR'd string
def self.xor(key, value)
unless key && value
raise ArgumentError, 'XOR key and value must be supplied'
end
xor_key =
case key
when String
if key.empty?
raise ArgumentError, 'XOR key must not be empty'
end
key
when Integer
unless key.between?(0x00, 0xff)
raise ArgumentError, 'XOR key must be between 0x00 and 0xff'
end
# Convert integer to string
[key].pack('C')
end
# Get byte arrays for key and value
xor_key = xor_key.bytes
xor_value = value.bytes
# XOR value against cycled key
xor_value.zip(xor_key.cycle).map { |v, k| v ^ k }.pack('C*')
end
end
Version data entries
37 entries across 37 versions & 1 rubygems