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1/* SPDX-License-Identifier: GPL-2.0-only */2/*3 * sha512_base.h - core logic for SHA-512 implementations4 *5 * Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>6 */7 8#ifndef _CRYPTO_SHA512_BASE_H9#define _CRYPTO_SHA512_BASE_H10 11#include <crypto/internal/hash.h>12#include <crypto/sha2.h>13#include <linux/crypto.h>14#include <linux/module.h>15#include <linux/string.h>16 17#include <linux/unaligned.h>18 19typedef void (sha512_block_fn)(struct sha512_state *sst, u8 const *src,20 int blocks);21 22static inline int sha384_base_init(struct shash_desc *desc)23{24 struct sha512_state *sctx = shash_desc_ctx(desc);25 26 sctx->state[0] = SHA384_H0;27 sctx->state[1] = SHA384_H1;28 sctx->state[2] = SHA384_H2;29 sctx->state[3] = SHA384_H3;30 sctx->state[4] = SHA384_H4;31 sctx->state[5] = SHA384_H5;32 sctx->state[6] = SHA384_H6;33 sctx->state[7] = SHA384_H7;34 sctx->count[0] = sctx->count[1] = 0;35 36 return 0;37}38 39static inline int sha512_base_init(struct shash_desc *desc)40{41 struct sha512_state *sctx = shash_desc_ctx(desc);42 43 sctx->state[0] = SHA512_H0;44 sctx->state[1] = SHA512_H1;45 sctx->state[2] = SHA512_H2;46 sctx->state[3] = SHA512_H3;47 sctx->state[4] = SHA512_H4;48 sctx->state[5] = SHA512_H5;49 sctx->state[6] = SHA512_H6;50 sctx->state[7] = SHA512_H7;51 sctx->count[0] = sctx->count[1] = 0;52 53 return 0;54}55 56static inline int sha512_base_do_update(struct shash_desc *desc,57 const u8 *data,58 unsigned int len,59 sha512_block_fn *block_fn)60{61 struct sha512_state *sctx = shash_desc_ctx(desc);62 unsigned int partial = sctx->count[0] % SHA512_BLOCK_SIZE;63 64 sctx->count[0] += len;65 if (sctx->count[0] < len)66 sctx->count[1]++;67 68 if (unlikely((partial + len) >= SHA512_BLOCK_SIZE)) {69 int blocks;70 71 if (partial) {72 int p = SHA512_BLOCK_SIZE - partial;73 74 memcpy(sctx->buf + partial, data, p);75 data += p;76 len -= p;77 78 block_fn(sctx, sctx->buf, 1);79 }80 81 blocks = len / SHA512_BLOCK_SIZE;82 len %= SHA512_BLOCK_SIZE;83 84 if (blocks) {85 block_fn(sctx, data, blocks);86 data += blocks * SHA512_BLOCK_SIZE;87 }88 partial = 0;89 }90 if (len)91 memcpy(sctx->buf + partial, data, len);92 93 return 0;94}95 96static inline int sha512_base_do_finalize(struct shash_desc *desc,97 sha512_block_fn *block_fn)98{99 const int bit_offset = SHA512_BLOCK_SIZE - sizeof(__be64[2]);100 struct sha512_state *sctx = shash_desc_ctx(desc);101 __be64 *bits = (__be64 *)(sctx->buf + bit_offset);102 unsigned int partial = sctx->count[0] % SHA512_BLOCK_SIZE;103 104 sctx->buf[partial++] = 0x80;105 if (partial > bit_offset) {106 memset(sctx->buf + partial, 0x0, SHA512_BLOCK_SIZE - partial);107 partial = 0;108 109 block_fn(sctx, sctx->buf, 1);110 }111 112 memset(sctx->buf + partial, 0x0, bit_offset - partial);113 bits[0] = cpu_to_be64(sctx->count[1] << 3 | sctx->count[0] >> 61);114 bits[1] = cpu_to_be64(sctx->count[0] << 3);115 block_fn(sctx, sctx->buf, 1);116 117 return 0;118}119 120static inline int sha512_base_finish(struct shash_desc *desc, u8 *out)121{122 unsigned int digest_size = crypto_shash_digestsize(desc->tfm);123 struct sha512_state *sctx = shash_desc_ctx(desc);124 __be64 *digest = (__be64 *)out;125 int i;126 127 for (i = 0; digest_size > 0; i++, digest_size -= sizeof(__be64))128 put_unaligned_be64(sctx->state[i], digest++);129 130 memzero_explicit(sctx, sizeof(*sctx));131 return 0;132}133 134#endif /* _CRYPTO_SHA512_BASE_H */135