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SFL Version 2.11

crypt_decode

#include "sflcryp.h"
Bool
crypt_decode (
    byte *buffer,                       /*  Data to decrypt, in-place        */
    word  buffer_size,                  /*  Amount of data to decrypt        */
    int   algorithm,                    /*  What type of decryption          */
    const byte *key)                    /*  Decryption key                   */

Synopsis

Decrypt a buffer that was produced by crypt encode(). You must (obviously, I reckon) use the same algorithm and key as was used to encrypt the data. Returns TRUE if the buffer is decrypted okay. The buffer is encrypted in-place. The algorithm can be one of:

CRYPT IDEA	Use IDEA encryption.
CRYPT MDC	Use MDC encryption.
CRYPT DES	Use DES encryption.
CRYPT XOR	Use XOR encryption.

The minimum buffer size, and key size depends on the algorithm:

CRYPT IDEA	Buffer is at least 8 bytes long, key is 16 bytes.
CRYPT MDC	Buffer is at least 8 bytes long, key is 8 bytes.
CRYPT DES	Buffer is at least 32 bytes long, key is 16 bytes.
CRYPT XOR	Buffer is at least 16 bytes long, key is 16 bytes.

The buffer size must be a multiple of the minimum size shown above. If you specify a buffer size of zero the function does nothing but returns TRUE.

Source Code - (sflcryp.c)

{
    return (crypt_data (buffer, buffer_size, algorithm, key, FALSE));
}

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