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_blocksize = MD5_HMAC_BLOCK_SIZE, 148 .cra_module = THIS_MODULE, 149 } 150 }; 151 152 static bool __init sparc64_has_md5_opcode(void) 153 { 154 unsigned long cfr; 155 156 if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO)) 157 return false; 158 159 __asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr)); 160 if (!(cfr & CFR_MD5)) 161 return false; 162 163 return true; 164 } 165 166 static int __init md5_sparc64_mod_init(void) 167 { 168 if (sparc64_has_md5_opcode()) { 169 pr_info("Using sparc64 md5 opcode optimized MD5 implementation\n"); 170 return crypto_register_shash(&alg); 171 } 172 pr_info("sparc64 md5 opcode not available.\n"); 173 return -ENODEV; 174 } 175 176 static void __exit md5_sparc64_mod_fini(void) 177 { 178 crypto_unregister_shash(&alg); 179 } 180 181 module_init(md5_sparc64_mod_init); 182 module_exit(md5_sparc64_mod_fini); 183 184 MODULE_LICENSE("GPL"); 185 MODULE_DESCRIPTION("MD5 Message Digest Algorithm, sparc64 md5 opcode accelerated"); 186 187 MODULE_ALIAS_CRYPTO("md5"); 188 189 #include "crop_devid.c" 190