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/*
 * Copyright 2016-2017 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the OpenSSL license (the "License").  You may not use
 * this file except in compliance with the License.  You can obtain a copy
 * in the file LICENSE in the source distribution or at
 * https://www.openssl.org/source/license.html
 */

/*
 * Derived from the BLAKE2 reference implementation written by Samuel Neves.
 * Copyright 2012, Samuel Neves <sneves@dei.uc.pt>
 * More information about the BLAKE2 hash function and its implementations
 * can be found at https://blake2.net.
 */

#include <stddef.h>

#define BLAKE2S_BLOCKBYTES    64
#define BLAKE2S_OUTBYTES      32
#define BLAKE2S_KEYBYTES      32
#define BLAKE2S_SALTBYTES     8
#define BLAKE2S_PERSONALBYTES 8

#define BLAKE2B_BLOCKBYTES    128
#define BLAKE2B_OUTBYTES      64
#define BLAKE2B_KEYBYTES      64
#define BLAKE2B_SALTBYTES     16
#define BLAKE2B_PERSONALBYTES 16

struct blake2s_param_st {
    uint8_t  digest_length; /* 1 */
    uint8_t  key_length;    /* 2 */
    uint8_t  fanout;        /* 3 */
    uint8_t  depth;         /* 4 */
    uint8_t  leaf_length[4];/* 8 */
    uint8_t  node_offset[6];/* 14 */
    uint8_t  node_depth;    /* 15 */
    uint8_t  inner_length;  /* 16 */
    uint8_t  salt[BLAKE2S_SALTBYTES]; /* 24 */
    uint8_t  personal[BLAKE2S_PERSONALBYTES];  /* 32 */
};

typedef struct blake2s_param_st BLAKE2S_PARAM;

struct blake2s_ctx_st {
    uint32_t h[8];
    uint32_t t[2];
    uint32_t f[2];
    uint8_t  buf[BLAKE2S_BLOCKBYTES];
    size_t   buflen;
};

struct blake2b_param_st {
    uint8_t  digest_length; /* 1 */
    uint8_t  key_length;    /* 2 */
    uint8_t  fanout;        /* 3 */
    uint8_t  depth;         /* 4 */
    uint8_t  leaf_length[4];/* 8 */
    uint8_t  node_offset[8];/* 16 */
    uint8_t  node_depth;    /* 17 */
    uint8_t  inner_length;  /* 18 */
    uint8_t  reserved[14];  /* 32 */
    uint8_t  salt[BLAKE2B_SALTBYTES]; /* 48 */
    uint8_t  personal[BLAKE2B_PERSONALBYTES];  /* 64 */
};

typedef struct blake2b_param_st BLAKE2B_PARAM;

struct blake2b_ctx_st {
    uint64_t h[8];
    uint64_t t[2];
    uint64_t f[2];
    uint8_t  buf[BLAKE2B_BLOCKBYTES];
    size_t   buflen;
};

#define BLAKE2B_DIGEST_LENGTH 64
#define BLAKE2S_DIGEST_LENGTH 32

typedef struct blake2s_ctx_st BLAKE2S_CTX;
typedef struct blake2b_ctx_st BLAKE2B_CTX;

int BLAKE2b_Init(BLAKE2B_CTX *c);
int BLAKE2b_Update(BLAKE2B_CTX *c, const void *data, size_t datalen);
int BLAKE2b_Final(unsigned char *md, BLAKE2B_CTX *c);

int BLAKE2s_Init(BLAKE2S_CTX *c);
int BLAKE2s_Update(BLAKE2S_CTX *c, const void *data, size_t datalen);
int BLAKE2s_Final(unsigned char *md, BLAKE2S_CTX *c);