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// SPDX-License-Identifier: GPL-2.0-only
/* Glue code for MD5 hashing optimized for sparc64 crypto opcodes.
*
* This is based largely upon arch/x86/crypto/sha1_ssse3_glue.c
* and crypto/md5.c which are:
*
* Copyright (c) Alan Smithee.
* Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
* Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
* Copyright (c) Mathias Krause <minipli@googlemail.com>
* Copyright (c) Cryptoapi developers.
* Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <asm/elf.h>
#include <asm/opcodes.h>
#include <asm/pstate.h>
#include <crypto/internal/hash.h>
#include <crypto/md5.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/unaligned.h>
struct sparc_md5_state {
__le32 hash[MD5_HASH_WORDS];
u64 byte_count;
};
asmlinkage void md5_sparc64_transform(__le32 *digest, const char *data,
unsigned int rounds);
static int md5_sparc64_init(struct shash_desc *desc)
{
struct sparc_md5_state *mctx = shash_desc_ctx(desc);
mctx->hash[0] = cpu_to_le32(MD5_H0);
mctx->hash[1] = cpu_to_le32(MD5_H1);
mctx->hash[2] = cpu_to_le32(MD5_H2);
mctx->hash[3] = cpu_to_le32(MD5_H3);
mctx->byte_count = 0;
return 0;
}
static int md5_sparc64_update(struct shash_desc *desc, const u8 *data,
unsigned int len)
{
struct sparc_md5_state *sctx = shash_desc_ctx(desc);
sctx->byte_count += round_down(len, MD5_HMAC_BLOCK_SIZE);
md5_sparc64_transform(sctx->hash, data, len / MD5_HMAC_BLOCK_SIZE);
return len - round_down(len, MD5_HMAC_BLOCK_SIZE);
}
/* Add padding and return the message digest. */
static int md5_sparc64_finup(struct shash_desc *desc, const u8 *src,
unsigned int offset, u8 *out)
{
struct sparc_md5_state *sctx = shash_desc_ctx(desc);
__le64 block[MD5_BLOCK_WORDS] = {};
u8 *p = memcpy(block, src, offset);
__le32 *dst = (__le32 *)out;
__le64 *pbits;
int i;
src = p;
p += offset;
*p++ = 0x80;
sctx->byte_count += offset;
pbits = &block[(MD5_BLOCK_WORDS / (offset > 55 ? 1 : 2)) - 1];
*pbits = cpu_to_le64(sctx->byte_count << 3);
md5_sparc64_transform(sctx->hash, src, (pbits - block + 1) / 8);
memzero_explicit(block, sizeof(block));
/* Store state in digest */
for (i = 0; i < MD5_HASH_WORDS; i++)
dst[i] = sctx->hash[i];
return 0;
}
static int md5_sparc64_export(struct shash_desc *desc, void *out)
{
struct sparc_md5_state *sctx = shash_desc_ctx(desc);
union {
u8 *u8;
u32 *u32;
u64 *u64;
} p = { .u8 = out };
int i;
for (i = 0; i < MD5_HASH_WORDS; i++)
put_unaligned(le32_to_cpu(sctx->hash[i]), p.u32++);
put_unaligned(sctx->byte_count, p.u64);
return 0;
}
static int md5_sparc64_import(struct shash_desc *desc, const void *in)
{
struct sparc_md5_state *sctx = shash_desc_ctx(desc);
union {
const u8 *u8;
const u32 *u32;
const u64 *u64;
} p = { .u8 = in };
int i;
for (i = 0; i < MD5_HASH_WORDS; i++)
sctx->hash[i] = cpu_to_le32(get_unaligned(p.u32++));
sctx->byte_count = get_unaligned(p.u64);
return 0;
}
static struct shash_alg alg = {
.digestsize = MD5_DIGEST_SIZE,
.init = md5_sparc64_init,
.update = md5_sparc64_update,
.finup = md5_sparc64_finup,
.export = md5_sparc64_export,
.import = md5_sparc64_import,
.descsize = sizeof(struct sparc_md5_state),
.statesize = sizeof(struct sparc_md5_state),
.base = {
.cra_name = "md5",
.cra_driver_name= "md5-sparc64",
.cra_priority = SPARC_CR_OPCODE_PRIORITY,
.cra_flags = CRYPTO_AHASH_ALG_BLOCK_ONLY,
.cra_blocksize = MD5_HMAC_BLOCK_SIZE,
.cra_module = THIS_MODULE,
}
};
static bool __init sparc64_has_md5_opcode(void)
{
unsigned long cfr;
if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
return false;
__asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
if (!(cfr & CFR_MD5))
return false;
return true;
}
static int __init md5_sparc64_mod_init(void)
{
if (sparc64_has_md5_opcode()) {
pr_info("Using sparc64 md5 opcode optimized MD5 implementation\n");
return crypto_register_shash(&alg);
}
pr_info("sparc64 md5 opcode not available.\n");
return -ENODEV;
}
static void __exit md5_sparc64_mod_fini(void)
{
crypto_unregister_shash(&alg);
}
module_init(md5_sparc64_mod_init);
module_exit(md5_sparc64_mod_fini);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("MD5 Message Digest Algorithm, sparc64 md5 opcode accelerated");
MODULE_ALIAS_CRYPTO("md5");
#include "crop_devid.c"
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