/usr/include/signal/hkdf.h is in libsignal-protocol-c-dev 2.3.1+git20171007-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 | #ifndef HKDF_H
#define HKDF_H
#include <stdint.h>
#include <stddef.h>
#include "signal_protocol_types.h"
#ifdef __cplusplus
extern "C" {
#endif
int hkdf_create(hkdf_context **context, int message_version, signal_context *global_context);
ssize_t hkdf_derive_secrets(hkdf_context *context,
uint8_t **output,
const uint8_t *input_key_material, size_t input_key_material_len,
const uint8_t *salt, size_t salt_len,
const uint8_t *info, size_t info_len,
size_t output_len);
int hkdf_compare(const hkdf_context *context1, const hkdf_context *context2);
void hkdf_destroy(signal_type_base *type);
#ifdef __cplusplus
}
#endif
#endif /* HKDF_H */
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