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/*
* sha512_base.h - core logic for SHA-512 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 (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;
}