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/*===-- llvm-c/blake3.h - BLAKE3 C Interface ----------------------*- C -*-===*\
|* *|
|* Released into the public domain with CC0 1.0 *|
|* See 'llvm/lib/Support/BLAKE3/LICENSE' for info. *|
|* SPDX-License-Identifier: CC0-1.0 *|
|* *|
|*===----------------------------------------------------------------------===*|
|* *|
|* This header declares the C interface to LLVM's BLAKE3 implementation. *|
|* Original BLAKE3 C API: https://github.com/BLAKE3-team/BLAKE3/tree/1.3.1/c *|
|* *|
|* Symbols are prefixed with 'llvm' to avoid a potential conflict with *|
|* another BLAKE3 version within the same program. *|
|* *|
\*===----------------------------------------------------------------------===*/
#ifndef LLVM_C_BLAKE3_H
#define LLVM_C_BLAKE3_H
#include "llvm-c/Visibility.h"
#include <stddef.h>
#include <stdint.h>
#ifdef __cplusplus
extern "C" {
#endif
#define LLVM_BLAKE3_VERSION_STRING "1.8.2"
#define LLVM_BLAKE3_KEY_LEN 32
#define LLVM_BLAKE3_OUT_LEN 32
#define LLVM_BLAKE3_BLOCK_LEN 64
#define LLVM_BLAKE3_CHUNK_LEN 1024
#define LLVM_BLAKE3_MAX_DEPTH 54
// This struct is a private implementation detail. It has to be here because
// it's part of llvm_blake3_hasher below.
typedef struct {
uint32_t cv[8];
uint64_t chunk_counter;
uint8_t buf[LLVM_BLAKE3_BLOCK_LEN];
uint8_t buf_len;
uint8_t blocks_compressed;
uint8_t flags;
} llvm_blake3_chunk_state;
typedef struct {
uint32_t key[8];
llvm_blake3_chunk_state chunk;
uint8_t cv_stack_len;
// The stack size is MAX_DEPTH + 1 because we do lazy merging. For example,
// with 7 chunks, we have 3 entries in the stack. Adding an 8th chunk
// requires a 4th entry, rather than merging everything down to 1, because we
// don't know whether more input is coming. This is different from how the
// reference implementation does things.
uint8_t cv_stack[(LLVM_BLAKE3_MAX_DEPTH + 1) * LLVM_BLAKE3_OUT_LEN];
} llvm_blake3_hasher;
LLVM_C_ABI const char *llvm_blake3_version(void);
LLVM_C_ABI void llvm_blake3_hasher_init(llvm_blake3_hasher *self);
LLVM_C_ABI void
llvm_blake3_hasher_init_keyed(llvm_blake3_hasher *self,
const uint8_t key[LLVM_BLAKE3_KEY_LEN]);
LLVM_C_ABI void llvm_blake3_hasher_init_derive_key(llvm_blake3_hasher *self,
const char *context);
LLVM_C_ABI void llvm_blake3_hasher_init_derive_key_raw(llvm_blake3_hasher *self,
const void *context,
size_t context_len);
LLVM_C_ABI void llvm_blake3_hasher_update(llvm_blake3_hasher *self,
const void *input, size_t input_len);
LLVM_C_ABI void llvm_blake3_hasher_finalize(const llvm_blake3_hasher *self,
uint8_t *out, size_t out_len);
LLVM_C_ABI void llvm_blake3_hasher_finalize_seek(const llvm_blake3_hasher *self,
uint64_t seek, uint8_t *out,
size_t out_len);
LLVM_C_ABI void llvm_blake3_hasher_reset(llvm_blake3_hasher *self);
#ifdef __cplusplus
}
#endif
#endif /* LLVM_C_BLAKE3_H */
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