(Tcl) RC2 Encryption and Decryption

RC2 encryption. The Chilkat encryption component supports RC2 encryption in both ECB (Electronic Cookbook) and CBC (Cipher-Block Chaining) modes. The key size may range from 8 bits to 1024 bits.

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load ./chilkat.dll

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

set crypt [new_CkCrypt2]

# Set the encryption algorithm = "rc2"	
CkCrypt2_put_CryptAlgorithm $crypt "rc2"

# CipherMode may be "ecb" or "cbc"
CkCrypt2_put_CipherMode $crypt "cbc"

# KeyLength may range from 8 bits to 1024 bits
CkCrypt2_put_KeyLength $crypt 128

# RC2 also has an effective key length property
# which can also range from 8 bits to 1024 bits:
CkCrypt2_put_Rc2EffectiveKeyLength $crypt 128

# 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.  RC2 has a block
# size of 8 bytes, so encrypted output is always
# a multiple of 8.
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 "0001020304050607"
CkCrypt2_SetEncodedIV $crypt $ivHex "hex"

# The secret key must equal the size of the key.
# 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 8).
# 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