Eric Lee / smarc-fsl-linux-kernel

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crypto/xxhash_generic.c 2.39 KB
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67882e764   Nikolay Borisov   crypto: xxhash - ... 
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  // SPDX-License-Identifier: GPL-2.0
  
  #include <crypto/internal/hash.h>
  #include <linux/init.h>
  #include <linux/module.h>
  #include <linux/xxhash.h>
  #include <asm/unaligned.h>
  
  #define XXHASH64_BLOCK_SIZE	32
  #define XXHASH64_DIGEST_SIZE	8
  
  struct xxhash64_tfm_ctx {
  	u64 seed;
  };
  
  struct xxhash64_desc_ctx {
  	struct xxh64_state xxhstate;
  };
  
  static int xxhash64_setkey(struct crypto_shash *tfm, const u8 *key,
  			 unsigned int keylen)
  {
  	struct xxhash64_tfm_ctx *tctx = crypto_shash_ctx(tfm);
674f368a9   Eric Biggers   crypto: remove CR... 
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  	if (keylen != sizeof(tctx->seed))
67882e764   Nikolay Borisov   crypto: xxhash - ... 
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  		return -EINVAL;
67882e764   Nikolay Borisov   crypto: xxhash - ... 
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  	tctx->seed = get_unaligned_le64(key);
  	return 0;
  }
  
  static int xxhash64_init(struct shash_desc *desc)
  {
  	struct xxhash64_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
  	struct xxhash64_desc_ctx *dctx = shash_desc_ctx(desc);
  
  	xxh64_reset(&dctx->xxhstate, tctx->seed);
  
  	return 0;
  }
  
  static int xxhash64_update(struct shash_desc *desc, const u8 *data,
  			 unsigned int length)
  {
  	struct xxhash64_desc_ctx *dctx = shash_desc_ctx(desc);
  
  	xxh64_update(&dctx->xxhstate, data, length);
  
  	return 0;
  }
  
  static int xxhash64_final(struct shash_desc *desc, u8 *out)
  {
  	struct xxhash64_desc_ctx *dctx = shash_desc_ctx(desc);
  
  	put_unaligned_le64(xxh64_digest(&dctx->xxhstate), out);
  
  	return 0;
  }
  
  static int xxhash64_digest(struct shash_desc *desc, const u8 *data,
  			 unsigned int length, u8 *out)
  {
  	struct xxhash64_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
  
  	put_unaligned_le64(xxh64(data, length, tctx->seed), out);
  
  	return 0;
  }
  
  static struct shash_alg alg = {
  	.digestsize	= XXHASH64_DIGEST_SIZE,
  	.setkey		= xxhash64_setkey,
  	.init		= xxhash64_init,
  	.update		= xxhash64_update,
  	.final		= xxhash64_final,
  	.digest		= xxhash64_digest,
  	.descsize	= sizeof(struct xxhash64_desc_ctx),
  	.base		= {
  		.cra_name	 = "xxhash64",
  		.cra_driver_name = "xxhash64-generic",
  		.cra_priority	 = 100,
  		.cra_flags	 = CRYPTO_ALG_OPTIONAL_KEY,
  		.cra_blocksize	 = XXHASH64_BLOCK_SIZE,
  		.cra_ctxsize	 = sizeof(struct xxhash64_tfm_ctx),
  		.cra_module	 = THIS_MODULE,
  	}
  };
  
  static int __init xxhash_mod_init(void)
  {
  	return crypto_register_shash(&alg);
  }
  
  static void __exit xxhash_mod_fini(void)
  {
  	crypto_unregister_shash(&alg);
  }
  
  subsys_initcall(xxhash_mod_init);
  module_exit(xxhash_mod_fini);
  
  MODULE_AUTHOR("Nikolay Borisov <nborisov@suse.com>");
  MODULE_DESCRIPTION("xxhash calculations wrapper for lib/xxhash.c");
  MODULE_LICENSE("GPL");
  MODULE_ALIAS_CRYPTO("xxhash64");
  MODULE_ALIAS_CRYPTO("xxhash64-generic");