Class: Ccrypto::Ruby::CipherEngine
- Inherits:
-
Object
- Object
- Ccrypto::Ruby::CipherEngine
show all
- Includes:
- DataConversion, TR::CondUtils, TeLogger::TeLogHelper
- Defined in:
- lib/ccrypto/ruby/engines/cipher_engine.rb
Class Method Summary
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Instance Method Summary
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#from_b64, #from_hex, included, #to_b64, #to_hex, #to_int_array
Constructor Details
Returns a new instance of CipherEngine.
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# File 'lib/ccrypto/ruby/engines/cipher_engine.rb', line 61
def initialize(*args, &block)
@spec = args.first
teLogger.debug "Cipher spec : #{@spec}"
begin
case @spec
when Ccrypto::CipherEngineConfig
@cipher = OpenSSL::Cipher.new(@spec.provider_config)
when Ccrypto::DirectCipherConfig
@cipher = OpenSSL::Cipher.new(self.class.to_openssl_spec(@spec))
else
raise Ccrypto::CipherEngineException, "Not supported cipher init type #{@spec.class}"
end
rescue OpenSSL::Cipher::CipherError, RuntimeError => ex
raise Ccrypto::CipherEngineException, ex
end
case @spec.cipherOps
when :encrypt, :enc
teLogger.debug "Operation encrypt"
@cipher.encrypt
when :decrypt, :dec
teLogger.debug "Operation decrypt"
@cipher.decrypt
else
raise Ccrypto::CipherEngineException, "Cipher operation (encrypt/decrypt) must be given"
end
if @spec.has_iv?
teLogger.debug "IV from spec"
@cipher.iv = @spec.iv
teLogger.debug "IV : #{to_hex(@spec.iv)}"
else
teLogger.debug "Generate random IV"
@spec.iv = @cipher.random_iv
teLogger.debug "IV : #{to_hex(@spec.iv)}"
end
if @spec.has_key?
teLogger.debug "Key from spec"
case @spec.key
when Ccrypto::SecretKey
@cipher.key = @spec.key.to_bin
when String
@cipher.key = @spec.key
else
raise Ccrypto::CipherEngineException, "Unknown key type for processing #{@spec.key}"
end
else
teLogger.debug "Generate random Key"
@spec.key = @cipher.random_key
end
if @spec.is_mode?(:gcm)
if not_empty?(@spec.auth_data)
teLogger.debug "Setting auth data"
@cipher.auth_data = @spec.auth_data
end
if not_empty?(@spec.auth_tag)
raise CipherEngineException, "Tag length of 16 bytes is expected" if @spec.auth_tag.bytesize != 16
teLogger.debug "Setting auth tag"
@cipher.auth_tag = @spec.auth_tag
end
end
end
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Class Method Details
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.is_supported_cipher?(c) ⇒ Boolean
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# File 'lib/ccrypto/ruby/engines/cipher_engine.rb', line 23
def self.is_supported_cipher?(c)
case c
when String
supported_ciphers.include?(c)
when Hash
spec = to_openssl_spec(c)
begin
OpenSSL::Cipher.new(spec)
true
rescue Exception => ex
false
end
else
raise Ccrypto::CipherEngineException, "Unsupported input #{c} to check supported cipher"
end
end
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.supported_ciphers ⇒ Object
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# File 'lib/ccrypto/ruby/engines/cipher_engine.rb', line 14
def self.supported_ciphers
if @sCipher.nil?
@sCipher = OpenSSL::Cipher.ciphers
end
@sCipher
end
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.to_openssl_spec(spec) ⇒ Object
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# File 'lib/ccrypto/ruby/engines/cipher_engine.rb', line 40
def self.to_openssl_spec(spec)
res = []
teLogger.debug "to_openssl_spec #{spec}"
case spec.algo
when :blowfish
res << "bf"
else
res << spec.algo
end
res << spec.keysize if not_empty?(spec.keysize) and spec.keysize.to_i > 0 and not spec.is_algo?(:chacha20) and not spec.is_algo?(:seed) and not spec.is_algo?(:sm4) and not spec.is_algo?(:blowfish)
res << spec.mode
teLogger.debug "to_openssl_spec #{res}"
res.join("-")
end
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Instance Method Details
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#final(val = nil) ⇒ Object
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# File 'lib/ccrypto/ruby/engines/cipher_engine.rb', line 142
def final(val = nil)
res = []
begin
if not_empty?(val)
res << @cipher.update(val)
end
res << @cipher.final
rescue Exception => ex
raise CipherEngineException, ex
end
if @spec.is_mode?(:gcm) and @spec.is_encrypt_cipher_mode?
@spec.auth_tag = @cipher.auth_tag
end
res.join
end
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# File 'lib/ccrypto/ruby/engines/cipher_engine.rb', line 164
def reset
@cipher.reset
end
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#update(val) ⇒ Object
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# File 'lib/ccrypto/ruby/engines/cipher_engine.rb', line 138
def update(val)
@cipher.update(val)
end
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