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