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SFL Version 2.11

crypt_encode

#include "sflcryp.h"
Bool
crypt_encode (
    byte *buffer,                       /*  Data to encrypt, in-place        */
    word  buffer_size,                  /*  Amount of data to encrypt        */
    int   algorithm,                    /*  What type of encryption          */
    const byte *key)                    /*  Encryption key                   */

Synopsis

Encrypt a buffer with the specified algorithm and specified key. Returns TRUE if the buffer is encrypted sucessfully. 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.

Use crypt decode() with the same algorithm and key to decrypt the buffer. 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. For portability, the buffer size is limited to 64k.

Source Code - (sflcryp.c)

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

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