1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980 |
- #include <crypto/hash.h>
- #include <linux/err.h>
- #include <linux/init.h>
- #include <linux/kernel.h>
- #include <linux/module.h>
- #include <linux/crc32c.h>
- static struct crypto_shash *tfm;
- u32 crc32c(u32 crc, const void *address, unsigned int length)
- {
- SHASH_DESC_ON_STACK(shash, tfm);
- u32 ret, *ctx = (u32 *)shash_desc_ctx(shash);
- int err;
- shash->tfm = tfm;
- shash->flags = 0;
- *ctx = crc;
- err = crypto_shash_update(shash, address, length);
- BUG_ON(err);
- ret = *ctx;
- barrier_data(ctx);
- return ret;
- }
- EXPORT_SYMBOL(crc32c);
- static int __init libcrc32c_mod_init(void)
- {
- tfm = crypto_alloc_shash("crc32c", 0, 0);
- return PTR_ERR_OR_ZERO(tfm);
- }
- static void __exit libcrc32c_mod_fini(void)
- {
- crypto_free_shash(tfm);
- }
- module_init(libcrc32c_mod_init);
- module_exit(libcrc32c_mod_fini);
- MODULE_AUTHOR("Clay Haapala <chaapala@cisco.com>");
- MODULE_DESCRIPTION("CRC32c (Castagnoli) calculations");
- MODULE_LICENSE("GPL");
- MODULE_SOFTDEP("pre: crc32c");
|