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(Perl) AES OFB Output Feedback Mode EncryptionDemonstrates how to encrypt using AES OFB (Output Feedback) mode.
use chilkat(); # This example requires the Chilkat API to have been previously unlocked. # See Global Unlock Sample for sample code. $crypt = chilkat::CkCrypt2->new(); $crypt->put_CryptAlgorithm("aes"); # Set the cipher mode to Output Feedback $crypt->put_CipherMode("ofb"); $crypt->put_KeyLength(256); # EncodingMode specifies the encoding of the output for # encryption, and the input for decryption. # It may be "hex", "url", "base64", "quoted-printable", or many other choices. $crypt->put_EncodingMode("hex"); $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. $keyHex = "603deb1015ca71be2b73aef0857d77811f352c073b6108d72d9810a30914dff4"; $crypt->SetEncodedKey($keyHex,"hex"); # Encrypt a string... $encStr = $crypt->encryptStringENC("Popular opinions, on subjects not palpable to sense, are often true, but seldom or never the whole truth. -- John Stuart Mill"); print $encStr . "\r\n"; $decrypt = chilkat::CkCrypt2->new(); $decrypt->put_CryptAlgorithm("aes"); $decrypt->put_CipherMode("ofb"); $decrypt->put_KeyLength(256); $decrypt->put_EncodingMode("hex"); $decrypt->SetEncodedIV($ivHex,"hex"); $decrypt->SetEncodedKey($keyHex,"hex"); # Now decrypt: $decStr = $decrypt->decryptStringENC($encStr); print $decStr . "\r\n"; |
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