1 // SPDX-License-Identifier: GPL-2.0-or-later
7  *@Article{castagnoli-crc,
9  * title =        {{Optimization of Cyclic Redundancy-Check Codes with 24
19  * the iscsi-crc.c module of the linux-iscsi driver at
20  * http://linux-iscsi.sourceforge.net.
59 	struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm);  in chksum_init()
62 	ctx->crc = mctx->key;  in chksum_init()
77 	if (keylen != sizeof(mctx->key))  in chksum_setkey()
78 		return -EINVAL;  in chksum_setkey()
79 	mctx->key = get_unaligned_le32(key);  in chksum_setkey()
83 static int chksum_update(struct shash_desc *desc, const u8 *data,  in chksum_update()  argument
88 	ctx->crc = crc32c_le_base(ctx->crc, data, length);  in chksum_update()
92 static int chksum_update_arch(struct shash_desc *desc, const u8 *data,  in chksum_update_arch()  argument
97 	ctx->crc = __crc32c_le(ctx->crc, data, length);  in chksum_update_arch()
101 static int chksum_final(struct shash_desc *desc, u8 *out)  in chksum_final()  argument
105 	put_unaligned_le32(~ctx->crc, out);  in chksum_final()
109 static int __chksum_finup(u32 *crcp, const u8 *data, unsigned int len, u8 *out)  in __chksum_finup()  argument
111 	put_unaligned_le32(~crc32c_le_base(*crcp, data, len), out);  in __chksum_finup()
115 static int __chksum_finup_arch(u32 *crcp, const u8 *data, unsigned int len,  in __chksum_finup_arch()  argument
116 			       u8 *out)  in __chksum_finup_arch()  argument
118 	put_unaligned_le32(~__crc32c_le(*crcp, data, len), out);  in __chksum_finup_arch()
122 static int chksum_finup(struct shash_desc *desc, const u8 *data,  in chksum_finup()  argument
123 			unsigned int len, u8 *out)  in chksum_finup()  argument
127 	return __chksum_finup(&ctx->crc, data, len, out);  in chksum_finup()
130 static int chksum_finup_arch(struct shash_desc *desc, const u8 *data,  in chksum_finup_arch()  argument
131 			     unsigned int len, u8 *out)  in chksum_finup_arch()  argument
135 	return __chksum_finup_arch(&ctx->crc, data, len, out);  in chksum_finup_arch()
138 static int chksum_digest(struct shash_desc *desc, const u8 *data,  in chksum_digest()  argument
139 			 unsigned int length, u8 *out)  in chksum_digest()  argument
141 	struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm);  in chksum_digest()
143 	return __chksum_finup(&mctx->key, data, length, out);  in chksum_digest()
146 static int chksum_digest_arch(struct shash_desc *desc, const u8 *data,  in chksum_digest_arch()  argument
147 			      unsigned int length, u8 *out)  in chksum_digest_arch()  argument
149 	struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm);  in chksum_digest_arch()
151 	return __chksum_finup_arch(&mctx->key, data, length, out);  in chksum_digest_arch()
158 	mctx->key = ~0;  in crc32c_cra_init()
173 	.base.cra_driver_name	= "crc32c-generic",
191 	.base.cra_driver_name	= "crc32c-" __stringify(ARCH),
222 MODULE_ALIAS_CRYPTO("crc32c-generic");