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+/*
+   BLAKE2 reference source code package - reference C implementations
+
+   Copyright 2012, Samuel Neves <sneves@dei.uc.pt>.  You may use this under the
+   terms of the CC0, the OpenSSL Licence, or the Apache Public License 2.0, at
+   your option.  The terms of these licenses can be found at:
+
+   - CC0 1.0 Universal : http://creativecommons.org/publicdomain/zero/1.0
+   - OpenSSL license   : https://www.openssl.org/source/license.html
+   - Apache 2.0        : http://www.apache.org/licenses/LICENSE-2.0
+
+   More information about the BLAKE2 hash function can be found at
+   https://blake2.net.
+*/
+#ifndef BLAKE2_H
+#define BLAKE2_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+#define BLAKE2_PACKED(x) x __attribute__((packed))
+
+  enum blake2s_constant
+  {
+    BLAKE2S_BLOCKBYTES = 64,
+    BLAKE2S_OUTBYTES   = 32,
+    BLAKE2S_KEYBYTES   = 32,
+    BLAKE2S_SALTBYTES  = 8,
+    BLAKE2S_PERSONALBYTES = 8
+  };
+
+  typedef struct blake2s_state__
+  {
+    uint32_t h[8];
+    uint32_t t[2];
+    uint32_t f[2];
+    uint8_t  buf[BLAKE2S_BLOCKBYTES];
+    size_t   buflen;
+    size_t   outlen;
+    uint8_t  last_node;
+  } blake2s_state;
+
+  BLAKE2_PACKED(struct blake2s_param__
+  {
+    uint8_t  digest_length; /* 1 */
+    uint8_t  key_length;    /* 2 */
+    uint8_t  fanout;        /* 3 */
+    uint8_t  depth;         /* 4 */
+    uint32_t leaf_length;   /* 8 */
+    uint32_t node_offset;  /* 12 */
+    uint16_t xof_length;    /* 14 */
+    uint8_t  node_depth;    /* 15 */
+    uint8_t  inner_length;  /* 16 */
+    /* uint8_t  reserved[0]; */
+    uint8_t  salt[BLAKE2S_SALTBYTES]; /* 24 */
+    uint8_t  personal[BLAKE2S_PERSONALBYTES];  /* 32 */
+  });
+
+  typedef struct blake2s_param__ blake2s_param;
+
+  /* Padded structs result in a compile-time error */
+  enum {
+    BLAKE2_DUMMY_1 = 1/(sizeof(blake2s_param) == BLAKE2S_OUTBYTES)
+  };
+
+  int blake2s_init( blake2s_state *S, size_t outlen );
+  int blake2s_init_key( blake2s_state *S, size_t outlen, const void *key, size_t keylen );
+  int blake2s_init_param( blake2s_state *S, const blake2s_param *P );
+  int blake2s_update( blake2s_state *S, const void *in, size_t inlen );
+  int blake2s_final( blake2s_state *S, void *out, size_t outlen );
+
+  int blake2s( void *out, size_t outlen, const void *in, size_t inlen, const void *key, size_t keylen );
+
+#endif
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