Symmetric Cipher API - Convenience

kcapi_cipher_enc_aes_cbc — Convenience function for AES CBC encryption
kcapi_cipher_dec_aes_cbc — Convenience function for AES CBC decryption
kcapi_cipher_enc_aes_ctr — Convenience function for AES CTR encryption
kcapi_cipher_dec_aes_ctr — Convenience function for AES CTR decryption