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#ifndef CURVE_H
#define CURVE_H
#include <stdint.h>
#include <stddef.h>
#include "signal_protocol_types.h"
#ifdef __cplusplus
extern "C" {
#endif
#define CURVE_SIGNATURE_LEN 64
#define VRF_SIGNATURE_LEN 96
int curve_decode_point(ec_public_key **public_key, const uint8_t *key_data, size_t key_len, signal_context *global_context);
int ec_public_key_compare(const ec_public_key *key1, const ec_public_key *key2);
int ec_public_key_memcmp(const ec_public_key *key1, const ec_public_key *key2);
/**
* Serialize the public key into a buffer that can be stored.
* The format of this data is compatible with the input format of
* curve_decode_point().
*
* @param buffer Pointer to a buffer that will be allocated by this function
* and filled with the contents of the key. The caller is responsible for
* freeing this buffer with signal_buffer_free().
* @param key Key to serialize
* @return 0 on success, negative on failure
*/
int ec_public_key_serialize(signal_buffer **buffer, const ec_public_key *key);
void ec_public_key_destroy(signal_type_base *type);
int curve_decode_private_point(ec_private_key **private_key, const uint8_t *key_data, size_t key_len, signal_context *global_context);
int ec_private_key_compare(const ec_private_key *key1, const ec_private_key *key2);
/**
* Serialize the private key into a buffer that can be stored.
* The format of this data is compatible with the input format of
* curve_decode_private_point().
*
* @param buffer Pointer to a buffer that will be allocated by this function
* and filled with the contents of the key. The caller is responsible for
* freeing this buffer with signal_buffer_free().
* @param key Key to serialize
* @return 0 on success, negative on failure
*/
int ec_private_key_serialize(signal_buffer **buffer, const ec_private_key *key);
void ec_private_key_destroy(signal_type_base *type);
int ec_key_pair_create(ec_key_pair **key_pair, ec_public_key *public_key, ec_private_key *private_key);
ec_public_key *ec_key_pair_get_public(const ec_key_pair *key_pair);
ec_private_key *ec_key_pair_get_private(const ec_key_pair *key_pair);
void ec_key_pair_destroy(signal_type_base *type);
int curve_generate_private_key(signal_context *context, ec_private_key **private_key);
int curve_generate_public_key(ec_public_key **public_key, const ec_private_key *private_key);
/**
* Generates a Curve25519 keypair.
*
* @param key_pair Set to a randomly generated Curve25519 keypair on success.
* @return 0 on success, negative on failure
*/
int curve_generate_key_pair(signal_context *context, ec_key_pair **key_pair);
/**
* Allocate a new ec_public_key list
*
* @return pointer to the allocated list, or 0 on failure
*/
ec_public_key_list *ec_public_key_list_alloc(void);
/**
* Copy an ec_public_key list
*
* @return pointer to the copy of the list, or 0 on failure
*/
ec_public_key_list *ec_public_key_list_copy(const ec_public_key_list *list);
/**
* Push a new value onto the end of the list
*
* @param list the list
* @param value the value to push
* @return 0 on success, negative on failure
*/
int ec_public_key_list_push_back(ec_public_key_list *list, ec_public_key *value);
/**
* Gets the size of the list.
*
* @param list the list
* @return the size of the list
*/
unsigned int ec_public_key_list_size(const ec_public_key_list *list);
/**
* Gets the value of the element at a particular index in the list
*
* @param list the list
* @param index the index within the list
* @return the value
*/
ec_public_key *ec_public_key_list_at(const ec_public_key_list *list, unsigned int index);
/**
* Sorts the list based on a comparison of the key data.
*
* @param list the list
*/
void ec_public_key_list_sort(ec_public_key_list *list);
/**
* Free the ec_public_key list
* @param list the list to free
*/
void ec_public_key_list_free(ec_public_key_list *list);
/**
* Calculates an ECDH agreement.
*
* @param shared_key_data Set to a 32-byte shared secret on success.
* @param public_key The Curve25519 (typically remote party's) public key.
* @param private_key The Curve25519 (typically yours) private key.
* @return length of the shared secret on success, negative on failure
*/
int curve_calculate_agreement(uint8_t **shared_key_data, const ec_public_key *public_key, const ec_private_key *private_key);
/**
* Verify a Curve25519 signature.
*
* @param signing_key The Curve25519 public key the signature belongs to.
* @param message_data The message that was signed.
* @param message_len The length of the message that was signed.
* @param signature_data The signature to verify.
* @param signature_len The length of the signature to verify.
* @return 1 if valid, 0 if invalid, negative on failure
*/
int curve_verify_signature(const ec_public_key *signing_key,
const uint8_t *message_data, size_t message_len,
const uint8_t *signature_data, size_t signature_len);
/**
* Calculates a Curve25519 signature.
*
* @param signature Set to a 64-byte signature on success.
* @param signing_key The private Curve25519 key to create the signature with.
* @param message_data The message to sign.
* @param message_len The length of the message to sign.
* @return 0 on success, negative on failure
*/
int curve_calculate_signature(signal_context *context,
signal_buffer **signature,
const ec_private_key *signing_key,
const uint8_t *message_data, size_t message_len);
/**
* Verify a Unique Curve25519 signature.
*
* @param vrf_output Set to VRF output on success
* @param signing_key The Curve25519 public key the unique signature belongs to.
* @param message_data The message that was signed.
* @param message_len The length of the message that was signed.
* @param signature_data The signature to verify.
* @param signature_len The length of the signature to verify.
* @return 1 if valid, 0 if invalid, negative on failure
*/
int curve_verify_vrf_signature(signal_context *context,
signal_buffer **vrf_output,
const ec_public_key *signing_key,
const uint8_t *message_data, size_t message_len,
const uint8_t *signature_data, size_t signature_len);
/**
* Calculates a Unique Curve25519 signature.
*
* @param signature Set to a 96-byte signature on success.
* @param signing_key The private Curve25519 key to create the signature with.
* @param message_data The message to sign.
* @param message_len The length of the message to sign.
* @return 0 on success, negative on failure
*/
int curve_calculate_vrf_signature(signal_context *context,
signal_buffer **signature,
const ec_private_key *signing_key,
const uint8_t *message_data, size_t message_len);
#ifdef __cplusplus
}
#endif
#endif /* CURVE_H */
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