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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Glue code for MD5 implementation for PPC assembler
*
* Based on generic implementation.
*
* Copyright (c) 2015 Markus Stockhausen <stockhausen@collogia.de>
*/
#include <crypto/internal/hash.h>
#include <crypto/md5.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/string.h>
extern void ppc_md5_transform(u32 *state, const u8 *src, u32 blocks);
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);
sctx->byte_count += round_down(len, MD5_HMAC_BLOCK_SIZE);
ppc_md5_transform(sctx->hash, data, len >> 6);
return len - round_down(len, MD5_HMAC_BLOCK_SIZE);
}
static int ppc_md5_finup(struct shash_desc *desc, const u8 *src,
unsigned int offset, u8 *out)
{
struct md5_state *sctx = shash_desc_ctx(desc);
__le64 block[MD5_BLOCK_WORDS] = {};
u8 *p = memcpy(block, src, offset);
__le32 *dst = (__le32 *)out;
__le64 *pbits;
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);
ppc_md5_transform(sctx->hash, src, (pbits - block + 1) / 8);
memzero_explicit(block, sizeof(block));
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]);
return 0;
}
static struct shash_alg alg = {
.digestsize = MD5_DIGEST_SIZE,
.init = ppc_md5_init,
.update = ppc_md5_update,
.finup = ppc_md5_finup,
.descsize = MD5_STATE_SIZE,
.base = {
.cra_name = "md5",
.cra_driver_name= "md5-ppc",
.cra_priority = 200,
.cra_flags = CRYPTO_AHASH_ALG_BLOCK_ONLY,
.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");
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