165 lines
3.8 KiB
C
165 lines
3.8 KiB
C
/*
|
|
* Glue code for MD5 implementation for PPC assembler
|
|
*
|
|
* Based on generic implementation.
|
|
*
|
|
* Copyright (c) 2015 Markus Stockhausen <stockhausen@collogia.de>
|
|
*
|
|
* 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 <crypto/internal/hash.h>
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/cryptohash.h>
|
|
#include <linux/types.h>
|
|
#include <crypto/md5.h>
|
|
#include <asm/byteorder.h>
|
|
|
|
extern void ppc_md5_transform(u32 *state, const u8 *src, u32 blocks);
|
|
|
|
static inline void ppc_md5_clear_context(struct md5_state *sctx)
|
|
{
|
|
int count = sizeof(struct md5_state) >> 2;
|
|
u32 *ptr = (u32 *)sctx;
|
|
|
|
/* make sure we can clear the fast way */
|
|
BUILD_BUG_ON(sizeof(struct md5_state) % 4);
|
|
do { *ptr++ = 0; } while (--count);
|
|
}
|
|
|
|
static int ppc_md5_init(struct shash_desc *desc)
|
|
{
|
|
struct md5_state *sctx = shash_desc_ctx(desc);
|
|
|
|
sctx->hash[0] = MD5_H0;
|
|
sctx->hash[1] = MD5_H1;
|
|
sctx->hash[2] = MD5_H2;
|
|
sctx->hash[3] = MD5_H3;
|
|
sctx->byte_count = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ppc_md5_update(struct shash_desc *desc, const u8 *data,
|
|
unsigned int len)
|
|
{
|
|
struct md5_state *sctx = shash_desc_ctx(desc);
|
|
const unsigned int offset = sctx->byte_count & 0x3f;
|
|
unsigned int avail = 64 - offset;
|
|
const u8 *src = data;
|
|
|
|
sctx->byte_count += len;
|
|
|
|
if (avail > len) {
|
|
memcpy((char *)sctx->block + offset, src, len);
|
|
return 0;
|
|
}
|
|
|
|
if (offset) {
|
|
memcpy((char *)sctx->block + offset, src, avail);
|
|
ppc_md5_transform(sctx->hash, (const u8 *)sctx->block, 1);
|
|
len -= avail;
|
|
src += avail;
|
|
}
|
|
|
|
if (len > 63) {
|
|
ppc_md5_transform(sctx->hash, src, len >> 6);
|
|
src += len & ~0x3f;
|
|
len &= 0x3f;
|
|
}
|
|
|
|
memcpy((char *)sctx->block, src, len);
|
|
return 0;
|
|
}
|
|
|
|
static int ppc_md5_final(struct shash_desc *desc, u8 *out)
|
|
{
|
|
struct md5_state *sctx = shash_desc_ctx(desc);
|
|
const unsigned int offset = sctx->byte_count & 0x3f;
|
|
const u8 *src = (const u8 *)sctx->block;
|
|
u8 *p = (u8 *)src + offset;
|
|
int padlen = 55 - offset;
|
|
__le64 *pbits = (__le64 *)((char *)sctx->block + 56);
|
|
__le32 *dst = (__le32 *)out;
|
|
|
|
*p++ = 0x80;
|
|
|
|
if (padlen < 0) {
|
|
memset(p, 0x00, padlen + sizeof (u64));
|
|
ppc_md5_transform(sctx->hash, src, 1);
|
|
p = (char *)sctx->block;
|
|
padlen = 56;
|
|
}
|
|
|
|
memset(p, 0, padlen);
|
|
*pbits = cpu_to_le64(sctx->byte_count << 3);
|
|
ppc_md5_transform(sctx->hash, src, 1);
|
|
|
|
dst[0] = cpu_to_le32(sctx->hash[0]);
|
|
dst[1] = cpu_to_le32(sctx->hash[1]);
|
|
dst[2] = cpu_to_le32(sctx->hash[2]);
|
|
dst[3] = cpu_to_le32(sctx->hash[3]);
|
|
|
|
ppc_md5_clear_context(sctx);
|
|
return 0;
|
|
}
|
|
|
|
static int ppc_md5_export(struct shash_desc *desc, void *out)
|
|
{
|
|
struct md5_state *sctx = shash_desc_ctx(desc);
|
|
|
|
memcpy(out, sctx, sizeof(*sctx));
|
|
return 0;
|
|
}
|
|
|
|
static int ppc_md5_import(struct shash_desc *desc, const void *in)
|
|
{
|
|
struct md5_state *sctx = shash_desc_ctx(desc);
|
|
|
|
memcpy(sctx, in, sizeof(*sctx));
|
|
return 0;
|
|
}
|
|
|
|
static struct shash_alg alg = {
|
|
.digestsize = MD5_DIGEST_SIZE,
|
|
.init = ppc_md5_init,
|
|
.update = ppc_md5_update,
|
|
.final = ppc_md5_final,
|
|
.export = ppc_md5_export,
|
|
.import = ppc_md5_import,
|
|
.descsize = sizeof(struct md5_state),
|
|
.statesize = sizeof(struct md5_state),
|
|
.base = {
|
|
.cra_name = "md5",
|
|
.cra_driver_name= "md5-ppc",
|
|
.cra_priority = 200,
|
|
.cra_blocksize = MD5_HMAC_BLOCK_SIZE,
|
|
.cra_module = THIS_MODULE,
|
|
}
|
|
};
|
|
|
|
static int __init ppc_md5_mod_init(void)
|
|
{
|
|
return crypto_register_shash(&alg);
|
|
}
|
|
|
|
static void __exit ppc_md5_mod_fini(void)
|
|
{
|
|
crypto_unregister_shash(&alg);
|
|
}
|
|
|
|
module_init(ppc_md5_mod_init);
|
|
module_exit(ppc_md5_mod_fini);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("MD5 Secure Hash Algorithm, PPC assembler");
|
|
|
|
MODULE_ALIAS_CRYPTO("md5");
|
|
MODULE_ALIAS_CRYPTO("md5-ppc");
|