mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-23 04:34:11 +08:00
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
140 lines
3.2 KiB
C
140 lines
3.2 KiB
C
/*
|
|
* Cryptographic API.
|
|
*
|
|
* SHA1 Secure Hash Algorithm.
|
|
*
|
|
* Derived from cryptoapi implementation, adapted for in-place
|
|
* scatterlist interface.
|
|
*
|
|
* Copyright (c) Alan Smithee.
|
|
* Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
|
|
* Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by the Free
|
|
* Software Foundation; either version 2 of the License, or (at your option)
|
|
* any later version.
|
|
*
|
|
*/
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/crypto.h>
|
|
#include <linux/cryptohash.h>
|
|
#include <asm/scatterlist.h>
|
|
#include <asm/byteorder.h>
|
|
|
|
#define SHA1_DIGEST_SIZE 20
|
|
#define SHA1_HMAC_BLOCK_SIZE 64
|
|
|
|
struct sha1_ctx {
|
|
u64 count;
|
|
u32 state[5];
|
|
u8 buffer[64];
|
|
};
|
|
|
|
static void sha1_init(void *ctx)
|
|
{
|
|
struct sha1_ctx *sctx = ctx;
|
|
static const struct sha1_ctx initstate = {
|
|
0,
|
|
{ 0x67452301, 0xEFCDAB89, 0x98BADCFE, 0x10325476, 0xC3D2E1F0 },
|
|
{ 0, }
|
|
};
|
|
|
|
*sctx = initstate;
|
|
}
|
|
|
|
static void sha1_update(void *ctx, const u8 *data, unsigned int len)
|
|
{
|
|
struct sha1_ctx *sctx = ctx;
|
|
unsigned int i, j;
|
|
u32 temp[SHA_WORKSPACE_WORDS];
|
|
|
|
j = (sctx->count >> 3) & 0x3f;
|
|
sctx->count += len << 3;
|
|
|
|
if ((j + len) > 63) {
|
|
memcpy(&sctx->buffer[j], data, (i = 64-j));
|
|
sha_transform(sctx->state, sctx->buffer, temp);
|
|
for ( ; i + 63 < len; i += 64) {
|
|
sha_transform(sctx->state, &data[i], temp);
|
|
}
|
|
j = 0;
|
|
}
|
|
else i = 0;
|
|
memset(temp, 0, sizeof(temp));
|
|
memcpy(&sctx->buffer[j], &data[i], len - i);
|
|
}
|
|
|
|
|
|
/* Add padding and return the message digest. */
|
|
static void sha1_final(void* ctx, u8 *out)
|
|
{
|
|
struct sha1_ctx *sctx = ctx;
|
|
u32 i, j, index, padlen;
|
|
u64 t;
|
|
u8 bits[8] = { 0, };
|
|
static const u8 padding[64] = { 0x80, };
|
|
|
|
t = sctx->count;
|
|
bits[7] = 0xff & t; t>>=8;
|
|
bits[6] = 0xff & t; t>>=8;
|
|
bits[5] = 0xff & t; t>>=8;
|
|
bits[4] = 0xff & t; t>>=8;
|
|
bits[3] = 0xff & t; t>>=8;
|
|
bits[2] = 0xff & t; t>>=8;
|
|
bits[1] = 0xff & t; t>>=8;
|
|
bits[0] = 0xff & t;
|
|
|
|
/* Pad out to 56 mod 64 */
|
|
index = (sctx->count >> 3) & 0x3f;
|
|
padlen = (index < 56) ? (56 - index) : ((64+56) - index);
|
|
sha1_update(sctx, padding, padlen);
|
|
|
|
/* Append length */
|
|
sha1_update(sctx, bits, sizeof bits);
|
|
|
|
/* Store state in digest */
|
|
for (i = j = 0; i < 5; i++, j += 4) {
|
|
u32 t2 = sctx->state[i];
|
|
out[j+3] = t2 & 0xff; t2>>=8;
|
|
out[j+2] = t2 & 0xff; t2>>=8;
|
|
out[j+1] = t2 & 0xff; t2>>=8;
|
|
out[j ] = t2 & 0xff;
|
|
}
|
|
|
|
/* Wipe context */
|
|
memset(sctx, 0, sizeof *sctx);
|
|
}
|
|
|
|
static struct crypto_alg alg = {
|
|
.cra_name = "sha1",
|
|
.cra_flags = CRYPTO_ALG_TYPE_DIGEST,
|
|
.cra_blocksize = SHA1_HMAC_BLOCK_SIZE,
|
|
.cra_ctxsize = sizeof(struct sha1_ctx),
|
|
.cra_module = THIS_MODULE,
|
|
.cra_list = LIST_HEAD_INIT(alg.cra_list),
|
|
.cra_u = { .digest = {
|
|
.dia_digestsize = SHA1_DIGEST_SIZE,
|
|
.dia_init = sha1_init,
|
|
.dia_update = sha1_update,
|
|
.dia_final = sha1_final } }
|
|
};
|
|
|
|
static int __init init(void)
|
|
{
|
|
return crypto_register_alg(&alg);
|
|
}
|
|
|
|
static void __exit fini(void)
|
|
{
|
|
crypto_unregister_alg(&alg);
|
|
}
|
|
|
|
module_init(init);
|
|
module_exit(fini);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm");
|