cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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md5-glue.c (3619B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * Glue code for MD5 implementation for PPC assembler
      4 *
      5 * Based on generic implementation.
      6 *
      7 * Copyright (c) 2015 Markus Stockhausen <stockhausen@collogia.de>
      8 */
      9
     10#include <crypto/internal/hash.h>
     11#include <linux/init.h>
     12#include <linux/module.h>
     13#include <linux/mm.h>
     14#include <linux/types.h>
     15#include <crypto/md5.h>
     16#include <asm/byteorder.h>
     17
     18extern void ppc_md5_transform(u32 *state, const u8 *src, u32 blocks);
     19
     20static inline void ppc_md5_clear_context(struct md5_state *sctx)
     21{
     22	int count = sizeof(struct md5_state) >> 2;
     23	u32 *ptr = (u32 *)sctx;
     24
     25	/* make sure we can clear the fast way */
     26	BUILD_BUG_ON(sizeof(struct md5_state) % 4);
     27	do { *ptr++ = 0; } while (--count);
     28}
     29
     30static int ppc_md5_init(struct shash_desc *desc)
     31{
     32	struct md5_state *sctx = shash_desc_ctx(desc);
     33
     34	sctx->hash[0] = MD5_H0;
     35	sctx->hash[1] = MD5_H1;
     36	sctx->hash[2] = MD5_H2;
     37	sctx->hash[3] =	MD5_H3;
     38	sctx->byte_count = 0;
     39
     40	return 0;
     41}
     42
     43static int ppc_md5_update(struct shash_desc *desc, const u8 *data,
     44			unsigned int len)
     45{
     46	struct md5_state *sctx = shash_desc_ctx(desc);
     47	const unsigned int offset = sctx->byte_count & 0x3f;
     48	unsigned int avail = 64 - offset;
     49	const u8 *src = data;
     50
     51	sctx->byte_count += len;
     52
     53	if (avail > len) {
     54		memcpy((char *)sctx->block + offset, src, len);
     55		return 0;
     56	}
     57
     58	if (offset) {
     59		memcpy((char *)sctx->block + offset, src, avail);
     60		ppc_md5_transform(sctx->hash, (const u8 *)sctx->block, 1);
     61		len -= avail;
     62		src += avail;
     63	}
     64
     65	if (len > 63) {
     66		ppc_md5_transform(sctx->hash, src, len >> 6);
     67		src += len & ~0x3f;
     68		len &= 0x3f;
     69	}
     70
     71	memcpy((char *)sctx->block, src, len);
     72	return 0;
     73}
     74
     75static int ppc_md5_final(struct shash_desc *desc, u8 *out)
     76{
     77	struct md5_state *sctx = shash_desc_ctx(desc);
     78	const unsigned int offset = sctx->byte_count & 0x3f;
     79	const u8 *src = (const u8 *)sctx->block;
     80	u8 *p = (u8 *)src + offset;
     81	int padlen = 55 - offset;
     82	__le64 *pbits = (__le64 *)((char *)sctx->block + 56);
     83	__le32 *dst = (__le32 *)out;
     84
     85	*p++ = 0x80;
     86
     87	if (padlen < 0) {
     88		memset(p, 0x00, padlen + sizeof (u64));
     89		ppc_md5_transform(sctx->hash, src, 1);
     90		p = (char *)sctx->block;
     91		padlen = 56;
     92	}
     93
     94	memset(p, 0, padlen);
     95	*pbits = cpu_to_le64(sctx->byte_count << 3);
     96	ppc_md5_transform(sctx->hash, src, 1);
     97
     98	dst[0] = cpu_to_le32(sctx->hash[0]);
     99	dst[1] = cpu_to_le32(sctx->hash[1]);
    100	dst[2] = cpu_to_le32(sctx->hash[2]);
    101	dst[3] = cpu_to_le32(sctx->hash[3]);
    102
    103	ppc_md5_clear_context(sctx);
    104	return 0;
    105}
    106
    107static int ppc_md5_export(struct shash_desc *desc, void *out)
    108{
    109	struct md5_state *sctx = shash_desc_ctx(desc);
    110
    111	memcpy(out, sctx, sizeof(*sctx));
    112	return 0;
    113}
    114
    115static int ppc_md5_import(struct shash_desc *desc, const void *in)
    116{
    117	struct md5_state *sctx = shash_desc_ctx(desc);
    118
    119	memcpy(sctx, in, sizeof(*sctx));
    120	return 0;
    121}
    122
    123static struct shash_alg alg = {
    124	.digestsize	=	MD5_DIGEST_SIZE,
    125	.init		=	ppc_md5_init,
    126	.update		=	ppc_md5_update,
    127	.final		=	ppc_md5_final,
    128	.export		=	ppc_md5_export,
    129	.import		=	ppc_md5_import,
    130	.descsize	=	sizeof(struct md5_state),
    131	.statesize	=	sizeof(struct md5_state),
    132	.base		=	{
    133		.cra_name	=	"md5",
    134		.cra_driver_name=	"md5-ppc",
    135		.cra_priority	=	200,
    136		.cra_blocksize	=	MD5_HMAC_BLOCK_SIZE,
    137		.cra_module	=	THIS_MODULE,
    138	}
    139};
    140
    141static int __init ppc_md5_mod_init(void)
    142{
    143	return crypto_register_shash(&alg);
    144}
    145
    146static void __exit ppc_md5_mod_fini(void)
    147{
    148	crypto_unregister_shash(&alg);
    149}
    150
    151module_init(ppc_md5_mod_init);
    152module_exit(ppc_md5_mod_fini);
    153
    154MODULE_LICENSE("GPL");
    155MODULE_DESCRIPTION("MD5 Secure Hash Algorithm, PPC assembler");
    156
    157MODULE_ALIAS_CRYPTO("md5");
    158MODULE_ALIAS_CRYPTO("md5-ppc");