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132 lines
2.8 KiB
132 lines
2.8 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright 2012 Xyratex Technology Limited |
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*/ |
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/* |
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* This is crypto api shash wrappers to crc32_le. |
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*/ |
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#include <asm/unaligned.h> |
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#include <linux/crc32.h> |
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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/string.h> |
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#include <linux/kernel.h> |
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#define CHKSUM_BLOCK_SIZE 1 |
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#define CHKSUM_DIGEST_SIZE 4 |
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/** No default init with ~0 */ |
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static int crc32_cra_init(struct crypto_tfm *tfm) |
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{ |
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u32 *key = crypto_tfm_ctx(tfm); |
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*key = 0; |
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return 0; |
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} |
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/* |
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* Setting the seed allows arbitrary accumulators and flexible XOR policy |
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* If your algorithm starts with ~0, then XOR with ~0 before you set |
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* the seed. |
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*/ |
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static int crc32_setkey(struct crypto_shash *hash, const u8 *key, |
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unsigned int keylen) |
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{ |
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u32 *mctx = crypto_shash_ctx(hash); |
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if (keylen != sizeof(u32)) |
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return -EINVAL; |
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*mctx = get_unaligned_le32(key); |
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return 0; |
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} |
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static int crc32_init(struct shash_desc *desc) |
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{ |
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u32 *mctx = crypto_shash_ctx(desc->tfm); |
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u32 *crcp = shash_desc_ctx(desc); |
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*crcp = *mctx; |
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return 0; |
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} |
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static int crc32_update(struct shash_desc *desc, const u8 *data, |
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unsigned int len) |
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{ |
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u32 *crcp = shash_desc_ctx(desc); |
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*crcp = crc32_le(*crcp, data, len); |
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return 0; |
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} |
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/* No final XOR 0xFFFFFFFF, like crc32_le */ |
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static int __crc32_finup(u32 *crcp, const u8 *data, unsigned int len, |
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u8 *out) |
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{ |
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put_unaligned_le32(crc32_le(*crcp, data, len), out); |
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return 0; |
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} |
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static int crc32_finup(struct shash_desc *desc, const u8 *data, |
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unsigned int len, u8 *out) |
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{ |
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return __crc32_finup(shash_desc_ctx(desc), data, len, out); |
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} |
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static int crc32_final(struct shash_desc *desc, u8 *out) |
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{ |
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u32 *crcp = shash_desc_ctx(desc); |
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put_unaligned_le32(*crcp, out); |
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return 0; |
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} |
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static int crc32_digest(struct shash_desc *desc, const u8 *data, |
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unsigned int len, u8 *out) |
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{ |
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return __crc32_finup(crypto_shash_ctx(desc->tfm), data, len, |
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out); |
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} |
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static struct shash_alg alg = { |
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.setkey = crc32_setkey, |
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.init = crc32_init, |
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.update = crc32_update, |
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.final = crc32_final, |
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.finup = crc32_finup, |
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.digest = crc32_digest, |
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.descsize = sizeof(u32), |
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.digestsize = CHKSUM_DIGEST_SIZE, |
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.base = { |
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.cra_name = "crc32", |
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.cra_driver_name = "crc32-generic", |
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.cra_priority = 100, |
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.cra_flags = CRYPTO_ALG_OPTIONAL_KEY, |
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.cra_blocksize = CHKSUM_BLOCK_SIZE, |
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.cra_ctxsize = sizeof(u32), |
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.cra_module = THIS_MODULE, |
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.cra_init = crc32_cra_init, |
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} |
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}; |
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static int __init crc32_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 crc32_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(crc32_mod_init); |
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module_exit(crc32_mod_fini); |
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MODULE_AUTHOR("Alexander Boyko <[email protected]>"); |
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MODULE_DESCRIPTION("CRC32 calculations wrapper for lib/crc32"); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS_CRYPTO("crc32"); |
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MODULE_ALIAS_CRYPTO("crc32-generic");
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