NAME¶

kcapi_cipher_dec_aes_cbc - Convenience function for AES CBC decryption

SYNOPSIS¶

ssize_t kcapi_cipher_dec_aes_cbc(const uint8_t * key, uint32_t keylen, const uint8_t * in, size_t inlen, const uint8_t * iv, uint8_t * out, size_t outlen);

ARGUMENTS¶

key

keylen

in

inlen

iv

out

outlen

DESCRIPTION¶

The convenience function performs an AES CBC decryption operation using the provided key, the given input buffer and the given IV. The output is stored in the out buffer.

Note, AES CBC requires an input data that is a multiple of 16 bytes. If you have data that is not guaranteed to be multiples of 16 bytes, either add zero bytes at the end of the buffer to pad it up to a multiple of 16 bytes. Otherwise, the CTR mode encryption operation may be usable.

The output buffer must be at least as large as the input buffer.

The IV must be exactly 16 bytes in size.

The AES type (AES-128, AES-192 or AES-256) is determined by the size of the given key. If the key is 16 bytes long, AES-128 is used. A 24 byte key implies AES-192 and a 32 byte key implies AES-256.

return number of bytes generated upon success; a negative errno-style error code if an error occurred

AUTHOR¶

Stephan Mueller <smueller@chronox.de>

COPYRIGHT¶