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Versions: 10
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Stored size: 1.21 KB
Contents
require 'openssl'
require 'securerandom'
module Aes
# encrypt the string with AES 256-bit CBC encryption.
# the key and iv are calculated by the derive_key_iv
# method using the provided password.
#
# returns encrypted_string, salt
def encrypt( string, pass)
salt = SecureRandom.random_bytes(16)
key, iv = derive_key_iv( pass, salt)
cipher = OpenSSL::Cipher::AES.new(256, :CBC)
cipher.encrypt
cipher.key = key
cipher.iv = iv
[cipher.update(string) + cipher.final, salt]
end
# decrypt the string with AES 256-bit CBC encryption.
# the key and iv are calculated by the derive_key_iv
# method using the provided password.
def decrypt( string, pass, salt)
key, iv = derive_key_iv( pass, salt)
decipher = OpenSSL::Cipher::AES.new(256, :CBC)
decipher.decrypt
decipher.key = key
decipher.iv = iv
decipher.update( string) + decipher.final
end
# derive a key and initial vector from the password thru
# the use of PKCS5 pbkdf2 key derivation function.
def derive_key_iv( pass, salt)
key = OpenSSL::PKCS5::pbkdf2_hmac_sha1( pass, salt, 4096, 32)
iv = OpenSSL::PKCS5::pbkdf2_hmac_sha1( pass, salt, 4096, 16)
[key, iv]
end
end
Version data entries
10 entries across 10 versions & 1 rubygems