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#pragma once
#include <stddef.h>
#include <stdint.h>
struct BLAKE2s_param {
uint8_t outlen; // digest length
uint8_t keylen; // key length
uint8_t fanout;
uint8_t depth;
uint32_t leaf_length;
uint32_t node_offset;
uint16_t node_offset_ex;
uint8_t node_depth;
uint8_t inner_length;
uint64_t salt;
uint64_t personalization;
};
struct BLAKE2s_ctx {
uint8_t b[64]; // input buffer
size_t c; // pointer for b[]
uint32_t h[8]; // chained state vector h
uint32_t t[2]; // total number of bytes
struct BLAKE2s_param param; // parameter block
};
/**
* 3.1 Mixing Function G
*/
void G(uint32_t V[16], unsigned a, unsigned b, unsigned c, unsigned d, uint32_t x, uint32_t y);
/**
* 3.2 Compression Function F
* @param t: 2w-bit offset counter t
* @param f: final block indicator flag f
*/
void F(struct BLAKE2s_ctx *context, uint32_t m[16], uint32_t f);
int BLAKE2s_init(struct BLAKE2s_ctx *ctx, uint8_t outlen, const void *key, uint8_t keylen);
void BLAKE2s_update(struct BLAKE2s_ctx *ctx, const void *d, size_t dd);
void BLAKE2s_final(struct BLAKE2s_ctx *ctx, void *out);
// All-in-one convenience function.
static inline int
BLAKE2s(void *out, uint8_t outlen, // return buffer for digest
const void *key, uint8_t keylen, // optional secret key
const void *in, size_t inlen) // data to be hashed
{
struct BLAKE2s_ctx ctx;
if (BLAKE2s_init(&ctx, outlen, key, keylen)) return -1;
BLAKE2s_update(&ctx, in, inlen);
BLAKE2s_final(&ctx, out);
return 0;
}
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