/* SPDX-License-Identifier: GPL-2.0-only *//* * sha512_base.h - core logic for SHA-512 implementations * * Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org> */ #ifndef _CRYPTO_SHA512_BASE_H#define _CRYPTO_SHA512_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 (sha512_block_fn)(struct sha512_state *sst, u8 const *src,			       int blocks); static inline int sha384_base_init(struct shash_desc *desc){	struct sha512_state *sctx = shash_desc_ctx(desc); 	sctx->state[0] = SHA384_H0;	sctx->state[1] = SHA384_H1;	sctx->state[2] = SHA384_H2;	sctx->state[3] = SHA384_H3;	sctx->state[4] = SHA384_H4;	sctx->state[5] = SHA384_H5;	sctx->state[6] = SHA384_H6;	sctx->state[7] = SHA384_H7;	sctx->count[0] = sctx->count[1] = 0; 	return 0;} static inline int sha512_base_init(struct shash_desc *desc){	struct sha512_state *sctx = shash_desc_ctx(desc); 	sctx->state[0] = SHA512_H0;	sctx->state[1] = SHA512_H1;	sctx->state[2] = SHA512_H2;	sctx->state[3] = SHA512_H3;	sctx->state[4] = SHA512_H4;	sctx->state[5] = SHA512_H5;	sctx->state[6] = SHA512_H6;	sctx->state[7] = SHA512_H7;	sctx->count[0] = sctx->count[1] = 0; 	return 0;} static inline int sha512_base_do_update(struct shash_desc *desc,					const u8 *data,					unsigned int len,					sha512_block_fn *block_fn){	struct sha512_state *sctx = shash_desc_ctx(desc);	unsigned int partial = sctx->count[0] % SHA512_BLOCK_SIZE; 	sctx->count[0] += len;	if (sctx->count[0] < len)		sctx->count[1]++; 	if (unlikely((partial + len) >= SHA512_BLOCK_SIZE)) {		int blocks; 		if (partial) {			int p = SHA512_BLOCK_SIZE - partial; 			memcpy(sctx->buf + partial, data, p);			data += p;			len -= p; 			block_fn(sctx, sctx->buf, 1);		} 		blocks = len / SHA512_BLOCK_SIZE;		len %= SHA512_BLOCK_SIZE; 		if (blocks) {			block_fn(sctx, data, blocks);			data += blocks * SHA512_BLOCK_SIZE;		}		partial = 0;	}	if (len)		memcpy(sctx->buf + partial, data, len); 	return 0;} static inline int sha512_base_do_finalize(struct shash_desc *desc,					  sha512_block_fn *block_fn){	const int bit_offset = SHA512_BLOCK_SIZE - sizeof(__be64[2]);	struct sha512_state *sctx = shash_desc_ctx(desc);	__be64 *bits = (__be64 *)(sctx->buf + bit_offset);	unsigned int partial = sctx->count[0] % SHA512_BLOCK_SIZE; 	sctx->buf[partial++] = 0x80;	if (partial > bit_offset) {		memset(sctx->buf + partial, 0x0, SHA512_BLOCK_SIZE - partial);		partial = 0; 		block_fn(sctx, sctx->buf, 1);	} 	memset(sctx->buf + partial, 0x0, bit_offset - partial);	bits[0] = cpu_to_be64(sctx->count[1] << 3 | sctx->count[0] >> 61);	bits[1] = cpu_to_be64(sctx->count[0] << 3);	block_fn(sctx, sctx->buf, 1); 	return 0;} static inline int sha512_base_finish(struct shash_desc *desc, u8 *out){	unsigned int digest_size = crypto_shash_digestsize(desc->tfm);	struct sha512_state *sctx = shash_desc_ctx(desc);	__be64 *digest = (__be64 *)out;	int i; 	for (i = 0; digest_size > 0; i++, digest_size -= sizeof(__be64))		put_unaligned_be64(sctx->state[i], digest++); 	*sctx = (struct sha512_state){};	return 0;} #endif /* _CRYPTO_SHA512_BASE_H */