linux/arch/sparc/crypto/sha512_glue.c
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   1// SPDX-License-Identifier: GPL-2.0-only
   2/* Glue code for SHA512 hashing optimized for sparc64 crypto opcodes.
   3 *
   4 * This is based largely upon crypto/sha512_generic.c
   5 *
   6 * Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com>
   7 * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
   8 * Copyright (c) 2003 Kyle McMartin <kyle@debian.org>
   9 */
  10
  11#define pr_fmt(fmt)     KBUILD_MODNAME ": " fmt
  12
  13#include <crypto/internal/hash.h>
  14#include <linux/init.h>
  15#include <linux/module.h>
  16#include <linux/mm.h>
  17#include <linux/types.h>
  18#include <crypto/sha2.h>
  19
  20#include <asm/pstate.h>
  21#include <asm/elf.h>
  22
  23#include "opcodes.h"
  24
  25asmlinkage void sha512_sparc64_transform(u64 *digest, const char *data,
  26                                         unsigned int rounds);
  27
  28static int sha512_sparc64_init(struct shash_desc *desc)
  29{
  30        struct sha512_state *sctx = shash_desc_ctx(desc);
  31        sctx->state[0] = SHA512_H0;
  32        sctx->state[1] = SHA512_H1;
  33        sctx->state[2] = SHA512_H2;
  34        sctx->state[3] = SHA512_H3;
  35        sctx->state[4] = SHA512_H4;
  36        sctx->state[5] = SHA512_H5;
  37        sctx->state[6] = SHA512_H6;
  38        sctx->state[7] = SHA512_H7;
  39        sctx->count[0] = sctx->count[1] = 0;
  40
  41        return 0;
  42}
  43
  44static int sha384_sparc64_init(struct shash_desc *desc)
  45{
  46        struct sha512_state *sctx = shash_desc_ctx(desc);
  47        sctx->state[0] = SHA384_H0;
  48        sctx->state[1] = SHA384_H1;
  49        sctx->state[2] = SHA384_H2;
  50        sctx->state[3] = SHA384_H3;
  51        sctx->state[4] = SHA384_H4;
  52        sctx->state[5] = SHA384_H5;
  53        sctx->state[6] = SHA384_H6;
  54        sctx->state[7] = SHA384_H7;
  55        sctx->count[0] = sctx->count[1] = 0;
  56
  57        return 0;
  58}
  59
  60static void __sha512_sparc64_update(struct sha512_state *sctx, const u8 *data,
  61                                    unsigned int len, unsigned int partial)
  62{
  63        unsigned int done = 0;
  64
  65        if ((sctx->count[0] += len) < len)
  66                sctx->count[1]++;
  67        if (partial) {
  68                done = SHA512_BLOCK_SIZE - partial;
  69                memcpy(sctx->buf + partial, data, done);
  70                sha512_sparc64_transform(sctx->state, sctx->buf, 1);
  71        }
  72        if (len - done >= SHA512_BLOCK_SIZE) {
  73                const unsigned int rounds = (len - done) / SHA512_BLOCK_SIZE;
  74
  75                sha512_sparc64_transform(sctx->state, data + done, rounds);
  76                done += rounds * SHA512_BLOCK_SIZE;
  77        }
  78
  79        memcpy(sctx->buf, data + done, len - done);
  80}
  81
  82static int sha512_sparc64_update(struct shash_desc *desc, const u8 *data,
  83                                 unsigned int len)
  84{
  85        struct sha512_state *sctx = shash_desc_ctx(desc);
  86        unsigned int partial = sctx->count[0] % SHA512_BLOCK_SIZE;
  87
  88        /* Handle the fast case right here */
  89        if (partial + len < SHA512_BLOCK_SIZE) {
  90                if ((sctx->count[0] += len) < len)
  91                        sctx->count[1]++;
  92                memcpy(sctx->buf + partial, data, len);
  93        } else
  94                __sha512_sparc64_update(sctx, data, len, partial);
  95
  96        return 0;
  97}
  98
  99static int sha512_sparc64_final(struct shash_desc *desc, u8 *out)
 100{
 101        struct sha512_state *sctx = shash_desc_ctx(desc);
 102        unsigned int i, index, padlen;
 103        __be64 *dst = (__be64 *)out;
 104        __be64 bits[2];
 105        static const u8 padding[SHA512_BLOCK_SIZE] = { 0x80, };
 106
 107        /* Save number of bits */
 108        bits[1] = cpu_to_be64(sctx->count[0] << 3);
 109        bits[0] = cpu_to_be64(sctx->count[1] << 3 | sctx->count[0] >> 61);
 110
 111        /* Pad out to 112 mod 128 and append length */
 112        index = sctx->count[0] % SHA512_BLOCK_SIZE;
 113        padlen = (index < 112) ? (112 - index) : ((SHA512_BLOCK_SIZE+112) - index);
 114
 115        /* We need to fill a whole block for __sha512_sparc64_update() */
 116        if (padlen <= 112) {
 117                if ((sctx->count[0] += padlen) < padlen)
 118                        sctx->count[1]++;
 119                memcpy(sctx->buf + index, padding, padlen);
 120        } else {
 121                __sha512_sparc64_update(sctx, padding, padlen, index);
 122        }
 123        __sha512_sparc64_update(sctx, (const u8 *)&bits, sizeof(bits), 112);
 124
 125        /* Store state in digest */
 126        for (i = 0; i < 8; i++)
 127                dst[i] = cpu_to_be64(sctx->state[i]);
 128
 129        /* Wipe context */
 130        memset(sctx, 0, sizeof(*sctx));
 131
 132        return 0;
 133}
 134
 135static int sha384_sparc64_final(struct shash_desc *desc, u8 *hash)
 136{
 137        u8 D[64];
 138
 139        sha512_sparc64_final(desc, D);
 140
 141        memcpy(hash, D, 48);
 142        memzero_explicit(D, 64);
 143
 144        return 0;
 145}
 146
 147static struct shash_alg sha512 = {
 148        .digestsize     =       SHA512_DIGEST_SIZE,
 149        .init           =       sha512_sparc64_init,
 150        .update         =       sha512_sparc64_update,
 151        .final          =       sha512_sparc64_final,
 152        .descsize       =       sizeof(struct sha512_state),
 153        .base           =       {
 154                .cra_name       =       "sha512",
 155                .cra_driver_name=       "sha512-sparc64",
 156                .cra_priority   =       SPARC_CR_OPCODE_PRIORITY,
 157                .cra_blocksize  =       SHA512_BLOCK_SIZE,
 158                .cra_module     =       THIS_MODULE,
 159        }
 160};
 161
 162static struct shash_alg sha384 = {
 163        .digestsize     =       SHA384_DIGEST_SIZE,
 164        .init           =       sha384_sparc64_init,
 165        .update         =       sha512_sparc64_update,
 166        .final          =       sha384_sparc64_final,
 167        .descsize       =       sizeof(struct sha512_state),
 168        .base           =       {
 169                .cra_name       =       "sha384",
 170                .cra_driver_name=       "sha384-sparc64",
 171                .cra_priority   =       SPARC_CR_OPCODE_PRIORITY,
 172                .cra_blocksize  =       SHA384_BLOCK_SIZE,
 173                .cra_module     =       THIS_MODULE,
 174        }
 175};
 176
 177static bool __init sparc64_has_sha512_opcode(void)
 178{
 179        unsigned long cfr;
 180
 181        if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
 182                return false;
 183
 184        __asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
 185        if (!(cfr & CFR_SHA512))
 186                return false;
 187
 188        return true;
 189}
 190
 191static int __init sha512_sparc64_mod_init(void)
 192{
 193        if (sparc64_has_sha512_opcode()) {
 194                int ret = crypto_register_shash(&sha384);
 195                if (ret < 0)
 196                        return ret;
 197
 198                ret = crypto_register_shash(&sha512);
 199                if (ret < 0) {
 200                        crypto_unregister_shash(&sha384);
 201                        return ret;
 202                }
 203
 204                pr_info("Using sparc64 sha512 opcode optimized SHA-512/SHA-384 implementation\n");
 205                return 0;
 206        }
 207        pr_info("sparc64 sha512 opcode not available.\n");
 208        return -ENODEV;
 209}
 210
 211static void __exit sha512_sparc64_mod_fini(void)
 212{
 213        crypto_unregister_shash(&sha384);
 214        crypto_unregister_shash(&sha512);
 215}
 216
 217module_init(sha512_sparc64_mod_init);
 218module_exit(sha512_sparc64_mod_fini);
 219
 220MODULE_LICENSE("GPL");
 221MODULE_DESCRIPTION("SHA-384 and SHA-512 Secure Hash Algorithm, sparc64 sha512 opcode accelerated");
 222
 223MODULE_ALIAS_CRYPTO("sha384");
 224MODULE_ALIAS_CRYPTO("sha512");
 225
 226#include "crop_devid.c"
 227