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-rw-r--r--crypto/xxhash_generic.c106
1 files changed, 106 insertions, 0 deletions
diff --git a/crypto/xxhash_generic.c b/crypto/xxhash_generic.c
new file mode 100644
index 000000000..55d1c8a76
--- /dev/null
+++ b/crypto/xxhash_generic.c
@@ -0,0 +1,106 @@
+// 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);
+
+ if (keylen != sizeof(tctx->seed))
+ return -EINVAL;
+ 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");