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#ifndef CRYPTO_AESCTR_H_
#define CRYPTO_AESCTR_H_
#include <stddef.h>
#include <stdint.h>
/* Opaque types. */
struct crypto_aes_key;
struct crypto_aesctr;
/**
* crypto_aesctr_init(key, nonce):
* Prepare to encrypt/decrypt data with AES in CTR mode, using the provided
* expanded ${key} and ${nonce}. The key provided must remain valid for the
* lifetime of the stream. This is the same as calling _alloc() followed by
* _init2().
*/
struct crypto_aesctr * crypto_aesctr_init(const struct crypto_aes_key *,
uint64_t);
/**
* crypto_aesctr_alloc(void):
* Allocate an object for performing AES in CTR code. This must be followed
* by calling _init2().
*/
struct crypto_aesctr * crypto_aesctr_alloc(void);
/**
* crypto_aesctr_init2(stream, key, nonce):
* Reset the AES-CTR stream ${stream}, using the ${key} and ${nonce}. If ${key}
* is NULL, retain the previous AES key.
*/
void crypto_aesctr_init2(struct crypto_aesctr *, const struct crypto_aes_key *,
uint64_t);
/**
* crypto_aesctr_stream(stream, inbuf, outbuf, buflen):
* Generate the next ${buflen} bytes of the AES-CTR stream ${stream} and xor
* them with bytes from ${inbuf}, writing the result into ${outbuf}. If the
* buffers ${inbuf} and ${outbuf} overlap, they must be identical.
*/
void crypto_aesctr_stream(struct crypto_aesctr *, const uint8_t *,
uint8_t *, size_t);
/**
* crypto_aesctr_free(stream):
* Free the AES-CTR stream ${stream}.
*/
void crypto_aesctr_free(struct crypto_aesctr *);
/**
* crypto_aesctr_buf(key, nonce, inbuf, outbuf, buflen):
* Equivalent to _init(key, nonce); _stream(inbuf, outbuf, buflen); _free().
*/
void crypto_aesctr_buf(const struct crypto_aes_key *, uint64_t,
const uint8_t *, uint8_t *, size_t);
#endif /* !CRYPTO_AESCTR_H_ */
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