/* SPDX-License-Identifier: GPL-2.0-only *//* * sha256_base.h - core logic for SHA-256 implementations * * Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org> */ #ifndef _CRYPTO_SHA256_BASE_H#define _CRYPTO_SHA256_BASE_H #include <crypto/internal/hash.h>#include <crypto/sha.h>#include <linux/crypto.h>#include <linux/module.h> #include <asm/unaligned.h> typedef void (sha256_block_fn)(struct sha256_state *sst, u8 const *src,			       int blocks); static inline int sha224_base_init(struct shash_desc *desc){	struct sha256_state *sctx = shash_desc_ctx(desc); 	sha224_init(sctx);	return 0;} static inline int sha256_base_init(struct shash_desc *desc){	struct sha256_state *sctx = shash_desc_ctx(desc); 	sha256_init(sctx);	return 0;} static inline int sha256_base_do_update(struct shash_desc *desc,					const u8 *data,					unsigned int len,					sha256_block_fn *block_fn){	struct sha256_state *sctx = shash_desc_ctx(desc);	unsigned int partial = sctx->count % SHA256_BLOCK_SIZE; 	sctx->count += len; 	if (unlikely((partial + len) >= SHA256_BLOCK_SIZE)) {		int blocks; 		if (partial) {			int p = SHA256_BLOCK_SIZE - partial; 			memcpy(sctx->buf + partial, data, p);			data += p;			len -= p; 			block_fn(sctx, sctx->buf, 1);		} 		blocks = len / SHA256_BLOCK_SIZE;		len %= SHA256_BLOCK_SIZE; 		if (blocks) {			block_fn(sctx, data, blocks);			data += blocks * SHA256_BLOCK_SIZE;		}		partial = 0;	}	if (len)		memcpy(sctx->buf + partial, data, len); 	return 0;} static inline int sha256_base_do_finalize(struct shash_desc *desc,					  sha256_block_fn *block_fn){	const int bit_offset = SHA256_BLOCK_SIZE - sizeof(__be64);	struct sha256_state *sctx = shash_desc_ctx(desc);	__be64 *bits = (__be64 *)(sctx->buf + bit_offset);	unsigned int partial = sctx->count % SHA256_BLOCK_SIZE; 	sctx->buf[partial++] = 0x80;	if (partial > bit_offset) {		memset(sctx->buf + partial, 0x0, SHA256_BLOCK_SIZE - partial);		partial = 0; 		block_fn(sctx, sctx->buf, 1);	} 	memset(sctx->buf + partial, 0x0, bit_offset - partial);	*bits = cpu_to_be64(sctx->count << 3);	block_fn(sctx, sctx->buf, 1); 	return 0;} static inline int sha256_base_finish(struct shash_desc *desc, u8 *out){	unsigned int digest_size = crypto_shash_digestsize(desc->tfm);	struct sha256_state *sctx = shash_desc_ctx(desc);	__be32 *digest = (__be32 *)out;	int i; 	for (i = 0; digest_size > 0; i++, digest_size -= sizeof(__be32))		put_unaligned_be32(sctx->state[i], digest++); 	*sctx = (struct sha256_state){};	return 0;} #endif /* _CRYPTO_SHA256_BASE_H */