linux/arch/sparc/crypto/md5_glue.c
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   1// SPDX-License-Identifier: GPL-2.0-only
   2/* Glue code for MD5 hashing optimized for sparc64 crypto opcodes.
   3 *
   4 * This is based largely upon arch/x86/crypto/sha1_ssse3_glue.c
   5 * and crypto/md5.c which are:
   6 *
   7 * Copyright (c) Alan Smithee.
   8 * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
   9 * Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
  10 * Copyright (c) Mathias Krause <minipli@googlemail.com>
  11 * Copyright (c) Cryptoapi developers.
  12 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
  13 */
  14
  15#define pr_fmt(fmt)     KBUILD_MODNAME ": " fmt
  16
  17#include <crypto/internal/hash.h>
  18#include <linux/init.h>
  19#include <linux/module.h>
  20#include <linux/mm.h>
  21#include <linux/types.h>
  22#include <crypto/md5.h>
  23
  24#include <asm/pstate.h>
  25#include <asm/elf.h>
  26
  27#include "opcodes.h"
  28
  29asmlinkage void md5_sparc64_transform(u32 *digest, const char *data,
  30                                      unsigned int rounds);
  31
  32static int md5_sparc64_init(struct shash_desc *desc)
  33{
  34        struct md5_state *mctx = shash_desc_ctx(desc);
  35
  36        mctx->hash[0] = MD5_H0;
  37        mctx->hash[1] = MD5_H1;
  38        mctx->hash[2] = MD5_H2;
  39        mctx->hash[3] = MD5_H3;
  40        le32_to_cpu_array(mctx->hash, 4);
  41        mctx->byte_count = 0;
  42
  43        return 0;
  44}
  45
  46static void __md5_sparc64_update(struct md5_state *sctx, const u8 *data,
  47                                 unsigned int len, unsigned int partial)
  48{
  49        unsigned int done = 0;
  50
  51        sctx->byte_count += len;
  52        if (partial) {
  53                done = MD5_HMAC_BLOCK_SIZE - partial;
  54                memcpy((u8 *)sctx->block + partial, data, done);
  55                md5_sparc64_transform(sctx->hash, (u8 *)sctx->block, 1);
  56        }
  57        if (len - done >= MD5_HMAC_BLOCK_SIZE) {
  58                const unsigned int rounds = (len - done) / MD5_HMAC_BLOCK_SIZE;
  59
  60                md5_sparc64_transform(sctx->hash, data + done, rounds);
  61                done += rounds * MD5_HMAC_BLOCK_SIZE;
  62        }
  63
  64        memcpy(sctx->block, data + done, len - done);
  65}
  66
  67static int md5_sparc64_update(struct shash_desc *desc, const u8 *data,
  68                              unsigned int len)
  69{
  70        struct md5_state *sctx = shash_desc_ctx(desc);
  71        unsigned int partial = sctx->byte_count % MD5_HMAC_BLOCK_SIZE;
  72
  73        /* Handle the fast case right here */
  74        if (partial + len < MD5_HMAC_BLOCK_SIZE) {
  75                sctx->byte_count += len;
  76                memcpy((u8 *)sctx->block + partial, data, len);
  77        } else
  78                __md5_sparc64_update(sctx, data, len, partial);
  79
  80        return 0;
  81}
  82
  83/* Add padding and return the message digest. */
  84static int md5_sparc64_final(struct shash_desc *desc, u8 *out)
  85{
  86        struct md5_state *sctx = shash_desc_ctx(desc);
  87        unsigned int i, index, padlen;
  88        u32 *dst = (u32 *)out;
  89        __le64 bits;
  90        static const u8 padding[MD5_HMAC_BLOCK_SIZE] = { 0x80, };
  91
  92        bits = cpu_to_le64(sctx->byte_count << 3);
  93
  94        /* Pad out to 56 mod 64 and append length */
  95        index = sctx->byte_count % MD5_HMAC_BLOCK_SIZE;
  96        padlen = (index < 56) ? (56 - index) : ((MD5_HMAC_BLOCK_SIZE+56) - index);
  97
  98        /* We need to fill a whole block for __md5_sparc64_update() */
  99        if (padlen <= 56) {
 100                sctx->byte_count += padlen;
 101                memcpy((u8 *)sctx->block + index, padding, padlen);
 102        } else {
 103                __md5_sparc64_update(sctx, padding, padlen, index);
 104        }
 105        __md5_sparc64_update(sctx, (const u8 *)&bits, sizeof(bits), 56);
 106
 107        /* Store state in digest */
 108        for (i = 0; i < MD5_HASH_WORDS; i++)
 109                dst[i] = sctx->hash[i];
 110
 111        /* Wipe context */
 112        memset(sctx, 0, sizeof(*sctx));
 113
 114        return 0;
 115}
 116
 117static int md5_sparc64_export(struct shash_desc *desc, void *out)
 118{
 119        struct md5_state *sctx = shash_desc_ctx(desc);
 120
 121        memcpy(out, sctx, sizeof(*sctx));
 122
 123        return 0;
 124}
 125
 126static int md5_sparc64_import(struct shash_desc *desc, const void *in)
 127{
 128        struct md5_state *sctx = shash_desc_ctx(desc);
 129
 130        memcpy(sctx, in, sizeof(*sctx));
 131
 132        return 0;
 133}
 134
 135static struct shash_alg alg = {
 136        .digestsize     =       MD5_DIGEST_SIZE,
 137        .init           =       md5_sparc64_init,
 138        .update         =       md5_sparc64_update,
 139        .final          =       md5_sparc64_final,
 140        .export         =       md5_sparc64_export,
 141        .import         =       md5_sparc64_import,
 142        .descsize       =       sizeof(struct md5_state),
 143        .statesize      =       sizeof(struct md5_state),
 144        .base           =       {
 145                .cra_name       =       "md5",
 146                .cra_driver_name=       "md5-sparc64",
 147                .cra_priority   =       SPARC_CR_OPCODE_PRIORITY,
 148                .cra_blocksize  =       MD5_HMAC_BLOCK_SIZE,
 149                .cra_module     =       THIS_MODULE,
 150        }
 151};
 152
 153static bool __init sparc64_has_md5_opcode(void)
 154{
 155        unsigned long cfr;
 156
 157        if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
 158                return false;
 159
 160        __asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
 161        if (!(cfr & CFR_MD5))
 162                return false;
 163
 164        return true;
 165}
 166
 167static int __init md5_sparc64_mod_init(void)
 168{
 169        if (sparc64_has_md5_opcode()) {
 170                pr_info("Using sparc64 md5 opcode optimized MD5 implementation\n");
 171                return crypto_register_shash(&alg);
 172        }
 173        pr_info("sparc64 md5 opcode not available.\n");
 174        return -ENODEV;
 175}
 176
 177static void __exit md5_sparc64_mod_fini(void)
 178{
 179        crypto_unregister_shash(&alg);
 180}
 181
 182module_init(md5_sparc64_mod_init);
 183module_exit(md5_sparc64_mod_fini);
 184
 185MODULE_LICENSE("GPL");
 186MODULE_DESCRIPTION("MD5 Message Digest Algorithm, sparc64 md5 opcode accelerated");
 187
 188MODULE_ALIAS_CRYPTO("md5");
 189
 190#include "crop_devid.c"
 191
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