/* * sha1_base.h - core logic for SHA-1 implementations * * Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include <crypto/internal/hash.h>#include <crypto/sha.h>#include <linux/crypto.h>#include <linux/module.h> #include <asm/unaligned.h> typedef void (sha1_block_fn)(struct sha1_state *sst, u8 const *src, int blocks); static inline int sha1_base_init(struct shash_desc *desc){	struct sha1_state *sctx = shash_desc_ctx(desc); 	sctx->state[0] = SHA1_H0;	sctx->state[1] = SHA1_H1;	sctx->state[2] = SHA1_H2;	sctx->state[3] = SHA1_H3;	sctx->state[4] = SHA1_H4;	sctx->count = 0; 	return 0;} static inline int sha1_base_do_update(struct shash_desc *desc,				      const u8 *data,				      unsigned int len,				      sha1_block_fn *block_fn){	struct sha1_state *sctx = shash_desc_ctx(desc);	unsigned int partial = sctx->count % SHA1_BLOCK_SIZE; 	sctx->count += len; 	if (unlikely((partial + len) >= SHA1_BLOCK_SIZE)) {		int blocks; 		if (partial) {			int p = SHA1_BLOCK_SIZE - partial; 			memcpy(sctx->buffer + partial, data, p);			data += p;			len -= p; 			block_fn(sctx, sctx->buffer, 1);		} 		blocks = len / SHA1_BLOCK_SIZE;		len %= SHA1_BLOCK_SIZE; 		if (blocks) {			block_fn(sctx, data, blocks);			data += blocks * SHA1_BLOCK_SIZE;		}		partial = 0;	}	if (len)		memcpy(sctx->buffer + partial, data, len); 	return 0;} static inline int sha1_base_do_finalize(struct shash_desc *desc,					sha1_block_fn *block_fn){	const int bit_offset = SHA1_BLOCK_SIZE - sizeof(__be64);	struct sha1_state *sctx = shash_desc_ctx(desc);	__be64 *bits = (__be64 *)(sctx->buffer + bit_offset);	unsigned int partial = sctx->count % SHA1_BLOCK_SIZE; 	sctx->buffer[partial++] = 0x80;	if (partial > bit_offset) {		memset(sctx->buffer + partial, 0x0, SHA1_BLOCK_SIZE - partial);		partial = 0; 		block_fn(sctx, sctx->buffer, 1);	} 	memset(sctx->buffer + partial, 0x0, bit_offset - partial);	*bits = cpu_to_be64(sctx->count << 3);	block_fn(sctx, sctx->buffer, 1); 	return 0;} static inline int sha1_base_finish(struct shash_desc *desc, u8 *out){	struct sha1_state *sctx = shash_desc_ctx(desc);	__be32 *digest = (__be32 *)out;	int i; 	for (i = 0; i < SHA1_DIGEST_SIZE / sizeof(__be32); i++)		put_unaligned_be32(sctx->state[i], digest++); 	*sctx = (struct sha1_state){};	return 0;}