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include/crypto/sha512_base.h 3.15 KB
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d2912cb15   Thomas Gleixner   treewide: Replace... 
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  /* SPDX-License-Identifier: GPL-2.0-only */
b84a2a0b4   Ard Biesheuvel   crypto: sha512 - ... 
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  /*
   * sha512_base.h - core logic for SHA-512 implementations
   *
   * Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>
b84a2a0b4   Ard Biesheuvel   crypto: sha512 - ... 
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   */
68289c634   Masahiro Yamada   crypto: add heade... 
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  #ifndef _CRYPTO_SHA512_BASE_H
  #define _CRYPTO_SHA512_BASE_H
b84a2a0b4   Ard Biesheuvel   crypto: sha512 - ... 
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  #include <crypto/internal/hash.h>
  #include <crypto/sha.h>
  #include <linux/crypto.h>
  #include <linux/module.h>
  
  #include <asm/unaligned.h>
  
  typedef void (sha512_block_fn)(struct sha512_state *sst, u8 const *src,
  			       int blocks);
  
  static inline int sha384_base_init(struct shash_desc *desc)
  {
  	struct sha512_state *sctx = shash_desc_ctx(desc);
  
  	sctx->state[0] = SHA384_H0;
  	sctx->state[1] = SHA384_H1;
  	sctx->state[2] = SHA384_H2;
  	sctx->state[3] = SHA384_H3;
  	sctx->state[4] = SHA384_H4;
  	sctx->state[5] = SHA384_H5;
  	sctx->state[6] = SHA384_H6;
  	sctx->state[7] = SHA384_H7;
  	sctx->count[0] = sctx->count[1] = 0;
  
  	return 0;
  }
  
  static inline int sha512_base_init(struct shash_desc *desc)
  {
  	struct sha512_state *sctx = shash_desc_ctx(desc);
  
  	sctx->state[0] = SHA512_H0;
  	sctx->state[1] = SHA512_H1;
  	sctx->state[2] = SHA512_H2;
  	sctx->state[3] = SHA512_H3;
  	sctx->state[4] = SHA512_H4;
  	sctx->state[5] = SHA512_H5;
  	sctx->state[6] = SHA512_H6;
  	sctx->state[7] = SHA512_H7;
  	sctx->count[0] = sctx->count[1] = 0;
  
  	return 0;
  }
  
  static inline int sha512_base_do_update(struct shash_desc *desc,
  					const u8 *data,
  					unsigned int len,
  					sha512_block_fn *block_fn)
  {
  	struct sha512_state *sctx = shash_desc_ctx(desc);
  	unsigned int partial = sctx->count[0] % SHA512_BLOCK_SIZE;
  
  	sctx->count[0] += len;
  	if (sctx->count[0] < len)
  		sctx->count[1]++;
  
  	if (unlikely((partial + len) >= SHA512_BLOCK_SIZE)) {
  		int blocks;
  
  		if (partial) {
  			int p = SHA512_BLOCK_SIZE - partial;
  
  			memcpy(sctx->buf + partial, data, p);
  			data += p;
  			len -= p;
  
  			block_fn(sctx, sctx->buf, 1);
  		}
  
  		blocks = len / SHA512_BLOCK_SIZE;
  		len %= SHA512_BLOCK_SIZE;
  
  		if (blocks) {
  			block_fn(sctx, data, blocks);
  			data += blocks * SHA512_BLOCK_SIZE;
  		}
  		partial = 0;
  	}
  	if (len)
  		memcpy(sctx->buf + partial, data, len);
  
  	return 0;
  }
  
  static inline int sha512_base_do_finalize(struct shash_desc *desc,
  					  sha512_block_fn *block_fn)
  {
  	const int bit_offset = SHA512_BLOCK_SIZE - sizeof(__be64[2]);
  	struct sha512_state *sctx = shash_desc_ctx(desc);
  	__be64 *bits = (__be64 *)(sctx->buf + bit_offset);
  	unsigned int partial = sctx->count[0] % SHA512_BLOCK_SIZE;
  
  	sctx->buf[partial++] = 0x80;
  	if (partial > bit_offset) {
  		memset(sctx->buf + partial, 0x0, SHA512_BLOCK_SIZE - partial);
  		partial = 0;
  
  		block_fn(sctx, sctx->buf, 1);
  	}
  
  	memset(sctx->buf + partial, 0x0, bit_offset - partial);
  	bits[0] = cpu_to_be64(sctx->count[1] << 3 | sctx->count[0] >> 61);
  	bits[1] = cpu_to_be64(sctx->count[0] << 3);
  	block_fn(sctx, sctx->buf, 1);
  
  	return 0;
  }
  
  static inline int sha512_base_finish(struct shash_desc *desc, u8 *out)
  {
  	unsigned int digest_size = crypto_shash_digestsize(desc->tfm);
  	struct sha512_state *sctx = shash_desc_ctx(desc);
  	__be64 *digest = (__be64 *)out;
  	int i;
  
  	for (i = 0; digest_size > 0; i++, digest_size -= sizeof(__be64))
  		put_unaligned_be64(sctx->state[i], digest++);
  
  	*sctx = (struct sha512_state){};
  	return 0;
  }
68289c634   Masahiro Yamada   crypto: add heade... 
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  #endif /* _CRYPTO_SHA512_BASE_H */