/* * Cryptographic API. * * SHA1 Secure Hash Algorithm. * * Derived from cryptoapi implementation, adapted for in-place * scatterlist interface. * * Copyright (c) Alan Smithee. * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk> * Copyright (c) Jean-Francois Dive <jef@linuxbe.org> * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the Free * Software Foundation; either version 2 of the License, or (at your option) * any later version. * */#include <crypto/internal/hash.h>#include <linux/init.h>#include <linux/module.h>#include <linux/mm.h>#include <linux/cryptohash.h>#include <linux/types.h>#include <crypto/sha.h>#include <asm/byteorder.h> static int sha1_init(struct shash_desc *desc){	struct sha1_state *sctx = shash_desc_ctx(desc); 	*sctx = (struct sha1_state){		.state = { SHA1_H0, SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4 },	}; 	return 0;} int crypto_sha1_update(struct shash_desc *desc, const u8 *data,			unsigned int len){	struct sha1_state *sctx = shash_desc_ctx(desc);	unsigned int partial, done;	const u8 *src; 	partial = sctx->count % SHA1_BLOCK_SIZE;	sctx->count += len;	done = 0;	src = data; 	if ((partial + len) >= SHA1_BLOCK_SIZE) {		u32 temp[SHA_WORKSPACE_WORDS]; 		if (partial) {			done = -partial;			memcpy(sctx->buffer + partial, data,			       done + SHA1_BLOCK_SIZE);			src = sctx->buffer;		} 		do {			sha_transform(sctx->state, src, temp);			done += SHA1_BLOCK_SIZE;			src = data + done;		} while (done + SHA1_BLOCK_SIZE <= len); 		memset(temp, 0, sizeof(temp));		partial = 0;	}	memcpy(sctx->buffer + partial, src, len - done); 	return 0;}EXPORT_SYMBOL(crypto_sha1_update);  /* Add padding and return the message digest. */static int sha1_final(struct shash_desc *desc, u8 *out){	struct sha1_state *sctx = shash_desc_ctx(desc);	__be32 *dst = (__be32 *)out;	u32 i, index, padlen;	__be64 bits;	static const u8 padding[64] = { 0x80, }; 	bits = cpu_to_be64(sctx->count << 3); 	/* Pad out to 56 mod 64 */	index = sctx->count & 0x3f;	padlen = (index < 56) ? (56 - index) : ((64+56) - index);	crypto_sha1_update(desc, padding, padlen); 	/* Append length */	crypto_sha1_update(desc, (const u8 *)&bits, sizeof(bits)); 	/* Store state in digest */	for (i = 0; i < 5; i++)		dst[i] = cpu_to_be32(sctx->state[i]); 	/* Wipe context */	memset(sctx, 0, sizeof *sctx); 	return 0;} static int sha1_export(struct shash_desc *desc, void *out){	struct sha1_state *sctx = shash_desc_ctx(desc); 	memcpy(out, sctx, sizeof(*sctx));	return 0;} static int sha1_import(struct shash_desc *desc, const void *in){	struct sha1_state *sctx = shash_desc_ctx(desc); 	memcpy(sctx, in, sizeof(*sctx));	return 0;} static struct shash_alg alg = {	.digestsize	=	SHA1_DIGEST_SIZE,	.init		=	sha1_init,	.update		=	crypto_sha1_update,	.final		=	sha1_final,	.export		=	sha1_export,	.import		=	sha1_import,	.descsize	=	sizeof(struct sha1_state),	.statesize	=	sizeof(struct sha1_state),	.base		=	{		.cra_name	=	"sha1",		.cra_driver_name=	"sha1-generic",		.cra_flags	=	CRYPTO_ALG_TYPE_SHASH,		.cra_blocksize	=	SHA1_BLOCK_SIZE,		.cra_module	=	THIS_MODULE,	}}; static int __init sha1_generic_mod_init(void){	return crypto_register_shash(&alg);} static void __exit sha1_generic_mod_fini(void){	crypto_unregister_shash(&alg);} module_init(sha1_generic_mod_init);module_exit(sha1_generic_mod_fini); MODULE_LICENSE("GPL");MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm"); MODULE_ALIAS("sha1");