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bfish.h - A ANSI C blowfish ECB API

Structures:

<pre> typedef struct bfish bfish_t A blowfish-structure which must be initiated with bfish_init() before use. typedef struct bfblk bfblk_t A blowfish-block that is used for en-/decrypting data. </pre>

Macros:

<pre> BFISH_BLOCKSZ 8 BFISH_MAX_KEY_LEN 56 BFISH_MIN_KEY_LEN 4 </pre>

Functions:

<pre> size_t bfish_buflen(len) Returns the required buffer length for encryption of data. In other words, this macro returns the closest upper multiple of eight. void bfish_deblock(bfish_t *bf, bfblk_t *blk) Decrypts a blowfish-block of eight bytes. [bf] is a initiated blowfish-structure and [blk] is a blowfish-block of bytes. void bfish_enblock(bfish_t *bf, bfblk_t *blk) Encrypts a blowfish-block of eight bytes. [bf] is a initiated blowfish-structure and [blk] is a blowfish-block of bytes. void bfish_decrypt(bfish_t *bf, void *buf, size_t len) This is a convenience-function that decrypts a buffer of [len] number of bytes. [bf] is a pointer to a initiated blowfish- structure and [buf] is a pointer to the data to be encrypted. [len] must be a multipler of eight, if [buf] is a correct blow- fish encrypted string of bytes. This functions decrypts to the buffer in place. void bfish_encrypt(bfish_t *bf, const void *buf, size_t len) This is a convenience-function that encrypts a buffer of [len] number of bytes. [bf] is a pointer to a initiated blowfish- structure and [buf] is a pointer to the data to be encrypted. If [len] is -1, buf is assumed to be a null-terminated string, and strlen() will be used to calculate the length of [buf]. This function encrypts to the buffer in place, so it MUST be of enough space to hold the encrypted data (which might be more than [len]). If encrypting a string of thirteen bytes, the buffer needs to be at least sixteen bytes long, (see the function bfish_buflen). void bfish_init(bfish_t *bf, const void *key, size_t len) Initiates a bluefish-structure for de-/encoding. [bf] is a pointer to a allocated blowfish-structure. [key] is the byte- string which will be used to do the encryption with. [len] is the number of bytes at [key] that should be used. If [len] is -1, [key] is assumed to be a null-terminated string, and strlen() will be used to calculate its length. size_t bfish_read(bfblk_t *blk, const void *buf, size_t len) Reads max eight bytes (lesser if [len] < 8) from [buf] and puts it in the blowfish-buffer at [blk]. The block are appended with zeroes if [len] < 8. void bfish_write(const bfblk_t *blk, void *buf) Writes the eight byte long blowfish-block [blk] to the buffer at [buf]. </pre>