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Tcl Examples

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(Tcl) AES Encryption

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.

Chilkat Tcl Extension Downloads

Chilkat Tcl Extension Downloads

load ./chilkat.dll

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

set crypt [new_CkCrypt2]

# AES is also known as Rijndael.		
CkCrypt2_put_CryptAlgorithm $crypt "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.
CkCrypt2_put_CipherMode $crypt "cbc"

# KeyLength may be 128, 192, 256
CkCrypt2_put_KeyLength $crypt 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.
CkCrypt2_put_PaddingScheme $crypt 0

# EncodingMode specifies the encoding of the output for
# encryption, and the input for decryption.
# It may be "hex", "url", "base64", or "quoted-printable".
CkCrypt2_put_EncodingMode $crypt "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.
set ivHex "000102030405060708090A0B0C0D0E0F"
CkCrypt2_SetEncodedIV $crypt $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.
set keyHex "000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F"
CkCrypt2_SetEncodedKey $crypt $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).
set encStr [CkCrypt2_encryptStringENC $crypt "The quick brown fox jumps over the lazy dog."]
puts "$encStr"

# Now decrypt:
set decStr [CkCrypt2_decryptStringENC $crypt $encStr]
puts "$decStr"

delete_CkCrypt2 $crypt

 

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