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Contents
module PacketGen
module Header
# Mixin for cryptographic classes
# @api private
# @author Sylvain Daubert
module Crypto
# Cryptographic error
class Error < PacketGen::Error; end
# Register cryptographic modes
# @param [OpenSSL::Cipher] conf
# @param [OpenSSL::HMAC] intg
# @return [void]
def set_crypto(conf, intg)
@conf, @intg = conf, intg
if conf.authenticated?
# #auth_tag_len only supported from ruby 2.4.0
@conf.auth_tag_len = @trunc if @conf.respond_to? :auth_tag_len
end
end
# Get confidentiality mode name
# @return [String]
def confidentiality_mode
mode = @conf.name.match(/-([^-]*)$/)[1]
raise Error, 'unknown cipher mode' if mode.nil?
mode.downcase
end
# Say if crypto modes permit authentication
# @return [Boolean]
def authenticated?
@conf.authenticated? or !!@intg
end
def authenticate!
@conf.final
if @intg
@intg.update @esn.to_s if @esn
@intg.digest[0, @icv_length] == @icv
else
true
end
rescue OpenSSL::Cipher::CipherError
false
end
def encipher(data)
enciphered_data = @conf.update(data)
@intg.update(enciphered_data) if @intg
enciphered_data
end
def decipher(data)
@intg.update(data) if @intg
@conf.update(data)
end
end
end
end
Version data entries
10 entries across 10 versions & 1 rubygems