Symmetric Cipher API - Generic

kcapi_cipher_init — initialize cipher handle
kcapi_cipher_destroy — close the cipher handle and release resources
kcapi_cipher_setkey — set the key for the cipher handle
kcapi_cipher_ivsize — return size of IV required for cipher
kcapi_cipher_blocksize — return size of one block of the cipher

These generic API for symmetric ciphers calls are to be used for both, the one-shot and the stream encryption/decryption operations.

API function calls used to invoke symmetric ciphers.