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include/crypto/blake2s.h 2.45 KB
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66d7fb94e   Jason A. Donenfeld   crypto: blake2s -... 
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  /* SPDX-License-Identifier: GPL-2.0 OR MIT */
  /*
   * Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
   */
  
  #ifndef BLAKE2S_H
  #define BLAKE2S_H
  
  #include <linux/types.h>
  #include <linux/kernel.h>
  #include <linux/string.h>
  
  #include <asm/bug.h>
  
  enum blake2s_lengths {
  	BLAKE2S_BLOCK_SIZE = 64,
  	BLAKE2S_HASH_SIZE = 32,
  	BLAKE2S_KEY_SIZE = 32,
  
  	BLAKE2S_128_HASH_SIZE = 16,
  	BLAKE2S_160_HASH_SIZE = 20,
  	BLAKE2S_224_HASH_SIZE = 28,
  	BLAKE2S_256_HASH_SIZE = 32,
  };
  
  struct blake2s_state {
  	u32 h[8];
  	u32 t[2];
  	u32 f[2];
  	u8 buf[BLAKE2S_BLOCK_SIZE];
  	unsigned int buflen;
  	unsigned int outlen;
  };
  
  enum blake2s_iv {
  	BLAKE2S_IV0 = 0x6A09E667UL,
  	BLAKE2S_IV1 = 0xBB67AE85UL,
  	BLAKE2S_IV2 = 0x3C6EF372UL,
  	BLAKE2S_IV3 = 0xA54FF53AUL,
  	BLAKE2S_IV4 = 0x510E527FUL,
  	BLAKE2S_IV5 = 0x9B05688CUL,
  	BLAKE2S_IV6 = 0x1F83D9ABUL,
  	BLAKE2S_IV7 = 0x5BE0CD19UL,
  };
  
  void blake2s_update(struct blake2s_state *state, const u8 *in, size_t inlen);
  void blake2s_final(struct blake2s_state *state, u8 *out);
  
  static inline void blake2s_init_param(struct blake2s_state *state,
  				      const u32 param)
  {
  	*state = (struct blake2s_state){{
  		BLAKE2S_IV0 ^ param,
  		BLAKE2S_IV1,
  		BLAKE2S_IV2,
  		BLAKE2S_IV3,
  		BLAKE2S_IV4,
  		BLAKE2S_IV5,
  		BLAKE2S_IV6,
  		BLAKE2S_IV7,
  	}};
  }
  
  static inline void blake2s_init(struct blake2s_state *state,
  				const size_t outlen)
  {
  	blake2s_init_param(state, 0x01010000 | outlen);
  	state->outlen = outlen;
  }
  
  static inline void blake2s_init_key(struct blake2s_state *state,
  				    const size_t outlen, const void *key,
  				    const size_t keylen)
  {
  	WARN_ON(IS_ENABLED(DEBUG) && (!outlen || outlen > BLAKE2S_HASH_SIZE ||
  		!key || !keylen || keylen > BLAKE2S_KEY_SIZE));
  
  	blake2s_init_param(state, 0x01010000 | keylen << 8 | outlen);
  	memcpy(state->buf, key, keylen);
  	state->buflen = BLAKE2S_BLOCK_SIZE;
  	state->outlen = outlen;
  }
  
  static inline void blake2s(u8 *out, const u8 *in, const u8 *key,
  			   const size_t outlen, const size_t inlen,
  			   const size_t keylen)
  {
  	struct blake2s_state state;
  
  	WARN_ON(IS_ENABLED(DEBUG) && ((!in && inlen > 0) || !out || !outlen ||
  		outlen > BLAKE2S_HASH_SIZE || keylen > BLAKE2S_KEY_SIZE ||
  		(!key && keylen)));
  
  	if (keylen)
  		blake2s_init_key(&state, outlen, key, keylen);
  	else
  		blake2s_init(&state, outlen);
  
  	blake2s_update(&state, in, inlen);
  	blake2s_final(&state, out);
  }
  
  void blake2s256_hmac(u8 *out, const u8 *in, const u8 *key, const size_t inlen,
  		     const size_t keylen);
  
  #endif /* BLAKE2S_H */