NAME

SYNOPSIS

  use Crypt::HCE_SHA;
  
  $hce_sha = Crypt::HCE_SHA->new("SharedSecret", "Random01,39j309ad");
  
  $crypted = $hce_sha->hce_block_encrypt("Encrypt this information");
  $info = $hce_sha->hce_block_decrypt($crypted);

  $mime_crypted = $hce_sha->hce_block_encode_mime("Encrypt and Base64 this information");
  $info = $hce_sha->hce_block_decode_mime($mime_crypted);

DESCRIPTION

Two interfaces are provided in the module. The first is straight block encryption/decryption the second does base64 mime encoding/decoding of the encrypted/decrypted blocks.

The idea is the the two sides have a shared secret that supplies one of the keys and a randomly generated block of bytes provides the second key. The random key is passed in cleartext between the two sides.

An example client and server are packaged as modules with this module. They are used in the tests. They can be found in the examples directory.

Thanks to Jake Angerman for the bug report on the bug in key generation for the chaining portion of the algorithm

AUTHOR

SEE ALSO