arch/sparc/crypto/md5_glue.c

   1 /* Glue code for MD5 hashing optimized for sparc64 crypto opcodes.
   2  *
   3  * This is based largely upon arch/x86/crypto/sha1_ssse3_glue.c
   4  * and crypto/md5.c which are:
   5  *
   6  * Copyright (c) Alan Smithee.
   7  * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
   8  * Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
   9  * Copyright (c) Mathias Krause <minipli@googlemail.com>
  10  * Copyright (c) Cryptoapi developers.
  11  * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
  12  */
  13
  14 #define pr_fmt(fmt)     KBUILD_MODNAME ": " fmt
  15
  16 #include <crypto/internal/hash.h>
  17 #include <linux/init.h>
  18 #include <linux/module.h>
  19 #include <linux/mm.h>
  20 #include <linux/cryptohash.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
  29 asmlinkage void md5_sparc64_transform(u32 *digest, const char *data,
  30                                       unsigned int rounds);
  31
  32 static int md5_sparc64_init(struct shash_desc *desc)
  33 {
  34         struct md5_state *mctx = shash_desc_ctx(desc);
  35
  36         mctx->hash[0] = cpu_to_le32(MD5_H0);
  37         mctx->hash[1] = cpu_to_le32(MD5_H1);
  38         mctx->hash[2] = cpu_to_le32(MD5_H2);
  39         mctx->hash[3] = cpu_to_le32(MD5_H3);
  40         mctx->byte_count = 0;
  41
  42         return 0;
  43 }
  44
  45 static void __md5_sparc64_update(struct md5_state *sctx, const u8 *data,
  46                                  unsigned int len, unsigned int partial)
  47 {
  48         unsigned int done = 0;
  49
  50         sctx->byte_count += len;
  51         if (partial) {
  52                 done = MD5_HMAC_BLOCK_SIZE - partial;
  53                 memcpy((u8 *)sctx->block + partial, data, done);
  54                 md5_sparc64_transform(sctx->hash, (u8 *)sctx->block, 1);
  55         }
  56         if (len - done >= MD5_HMAC_BLOCK_SIZE) {
  57                 const unsigned int rounds = (len - done) / MD5_HMAC_BLOCK_SIZE;
  58
  59                 md5_sparc64_transform(sctx->hash, data + done, rounds);
  60                 done += rounds * MD5_HMAC_BLOCK_SIZE;
  61         }
  62
  63         memcpy(sctx->block, data + done, len - done);
  64 }
  65
  66 static int md5_sparc64_update(struct shash_desc *desc, const u8 *data,
  67                               unsigned int len)
  68 {
  69         struct md5_state *sctx = shash_desc_ctx(desc);
  70         unsigned int partial = sctx->byte_count % MD5_HMAC_BLOCK_SIZE;
  71
  72         /* Handle the fast case right here */
  73         if (partial + len < MD5_HMAC_BLOCK_SIZE) {
  74                 sctx->byte_count += len;
  75                 memcpy((u8 *)sctx->block + partial, data, len);
  76         } else
  77                 __md5_sparc64_update(sctx, data, len, partial);
  78
  79         return 0;
  80 }
  81
  82 /* Add padding and return the message digest. */
  83 static int md5_sparc64_final(struct shash_desc *desc, u8 *out)
  84 {
  85         struct md5_state *sctx = shash_desc_ctx(desc);
  86         unsigned int i, index, padlen;
  87         u32 *dst = (u32 *)out;
  88         __le64 bits;
  89         static const u8 padding[MD5_HMAC_BLOCK_SIZE] = { 0x80, };
  90
  91         bits = cpu_to_le64(sctx->byte_count << 3);
  92
  93         /* Pad out to 56 mod 64 and append length */
  94         index = sctx->byte_count % MD5_HMAC_BLOCK_SIZE;
  95         padlen = (index < 56) ? (56 - index) : ((MD5_HMAC_BLOCK_SIZE+56) - index);
  96
  97         /* We need to fill a whole block for __md5_sparc64_update() */
  98         if (padlen <= 56) {
  99                 sctx->byte_count += padlen;
 100                 memcpy((u8 *)sctx->block + index, padding, padlen);
 101         } else {
 102                 __md5_sparc64_update(sctx, padding, padlen, index);
 103         }
 104         __md5_sparc64_update(sctx, (const u8 *)&bits, sizeof(bits), 56);
 105
 106         /* Store state in digest */
 107         for (i = 0; i < MD5_HASH_WORDS; i++)
 108                 dst[i] = sctx->hash[i];
 109
 110         /* Wipe context */
 111         memset(sctx, 0, sizeof(*sctx));
 112
 113         return 0;
 114 }
 115
 116 static int md5_sparc64_export(struct shash_desc *desc, void *out)
 117 {
 118         struct md5_state *sctx = shash_desc_ctx(desc);
 119
 120         memcpy(out, sctx, sizeof(*sctx));
 121
 122         return 0;
 123 }
 124
 125 static int md5_sparc64_import(struct shash_desc *desc, const void *in)
 126 {
 127         struct md5_state *sctx = shash_desc_ctx(desc);
 128
 129         memcpy(sctx, in, sizeof(*sctx));
 130
 131         return 0;
 132 }
 133
 134 static struct shash_alg alg = {
 135         .digestsize     =       MD5_DIGEST_SIZE,
 136         .init           =       md5_sparc64_init,
 137         .update         =       md5_sparc64_update,
 138         .final          =       md5_sparc64_final,
 139         .export         =       md5_sparc64_export,
 140         .import         =       md5_sparc64_import,
 141         .descsize       =       sizeof(struct md5_state),
 142         .statesize      =       sizeof(struct md5_state),
 143         .base           =       {
 144                 .cra_name       =       "md5",
 145                 .cra_driver_name=       "md5-sparc64",
 146                 .cra_priority   =       SPARC_CR_OPCODE_PRIORITY,
 147                 .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
 148                 .cra_blocksize  =       MD5_HMAC_BLOCK_SIZE,
 149                 .cra_module     =       THIS_MODULE,
 150         }
 151 };
 152
 153 static 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
 167 static 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
 177 static void __exit md5_sparc64_mod_fini(void)
 178 {
 179         crypto_unregister_shash(&alg);
 180 }
 181
 182 module_init(md5_sparc64_mod_init);
 183 module_exit(md5_sparc64_mod_fini);
 184
 185 MODULE_LICENSE("GPL");
 186 MODULE_DESCRIPTION("MD5 Message Digest Algorithm, sparc64 md5 opcode accelerated");
 187
 188 MODULE_ALIAS_CRYPTO("md5");
 189
 190 #include "crop_devid.c"