shishi_encrypt_ivupdate(3) API function


#include <shishi.h>

int shishi_encrypt_ivupdate(Shishi * handle, Shishi_key * key, int keyusage, const char * iv, size_t ivlen, char ** ivout, size_t * ivoutlen, const char * in, size_t inlen, char ** out, size_t * outlen);


Shishi * handle
shishi handle as allocated by shishi_init().
Shishi_key * key
key to encrypt with.
int keyusage
integer specifying what this key is encrypting.
const char * iv
input array with initialization vector
size_t ivlen
size of input array with initialization vector.
char ** ivout
output array with newly allocated updated initialization vector.
size_t * ivoutlen
size of output array with updated initialization vector.
const char * in
input array with data to encrypt.
size_t inlen
size of input array with data to encrypt.
char ** out
output array with newly allocated encrypted data.
size_t * outlen
output variable with size of newly allocated output array.


Encrypts data using specified initialization vector and key. The key actually used is derived using the key usage. If key usage is 0, no key derivation is used. The OUT buffer must be deallocated by the caller. If IVOUT or IVOUTLEN is NULL, the updated IV is not saved anywhere.

Note that DECRYPT(ENCRYPT(data)) does not necessarily yield data exactly. Some encryption types add pad to make the data fit into the block size of the encryption algorithm. Furthermore, the pad is not guaranteed to look in any special way, although existing implementations often pad with the zero byte. This means that you may have to "frame" data, so it is possible to infer the original length after decryption. Compare ASN.1 DER which contains such information.


Returns SHISHI_OK iff successful.


Report bugs to <[email protected]>.


Copyright © 2002-2010 Simon Josefsson.
Copying and distribution of this file, with or without modification, are permitted in any medium without royalty provided the copyright notice and this notice are preserved.