107 lines
2.5 KiB
C
107 lines
2.5 KiB
C
/*
|
|
* 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;
|
|
}
|