Ruby

AES Encryption

See more Encryption Examples

AES encryption. The Chilkat encryption component supports 128-bit, 192-bit, and 256-bit AES encryption in ECB (Electronic Cookbook), CBC (Cipher-Block Chaining), and other modes. Ruby

require 'chilkat'

# This example requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

crypt = Chilkat::CkCrypt2.new()

# AES is also known as Rijndael.		
crypt.put_CryptAlgorithm("aes")

# CipherMode may be "ecb", "cbc", "ofb", "cfb", "gcm", etc.
# Note: Check the online reference documentation to see the Chilkat versions
# when certain cipher modes were introduced.
crypt.put_CipherMode("cbc")

# KeyLength may be 128, 192, 256
crypt.put_KeyLength(256)

# The padding scheme determines the contents of the bytes
# that are added to pad the result to a multiple of the
# encryption algorithm's block size.  AES has a block
# size of 16 bytes, so encrypted output is always
# a multiple of 16.
crypt.put_PaddingScheme(0)

# EncodingMode specifies the encoding of the output for
# encryption, and the input for decryption.
# It may be "hex", "url", "base64", or "quoted-printable".
crypt.put_EncodingMode("hex")

# An initialization vector is required if using CBC mode.
# ECB mode does not use an IV.
# The length of the IV is equal to the algorithm's block size.
# It is NOT equal to the length of the key.
ivHex = "000102030405060708090A0B0C0D0E0F"
crypt.SetEncodedIV(ivHex,"hex")

# The secret key must equal the size of the key.  For
# 256-bit encryption, the binary secret key is 32 bytes.
# For 128-bit encryption, the binary secret key is 16 bytes.
keyHex = "000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F"
crypt.SetEncodedKey(keyHex,"hex")

# Encrypt a string...
# The input string is 44 ANSI characters (i.e. 44 bytes), so
# the output should be 48 bytes (a multiple of 16).
# Because the output is a hex string, it should
# be 96 characters long (2 chars per byte).
encStr = crypt.encryptStringENC("The quick brown fox jumps over the lazy dog.")
print encStr + "\n";

# This is the encrypted output in hex format:
# 4846F83AA211E239AA62A21F527F089EE9DDBEAD30EE15D4E79B607A621B97BEDB9B6F00A9B21F1B43A50B4C1BE0EDF2

# Now decrypt:
decStr = crypt.decryptStringENC(encStr)
print decStr + "\n";

# This is the decrypted string:
# The quick brown fox jumps over the lazy dog.