1 /* Glue code for SHA256 hashing optimized for sparc64 crypto opcodes. 2 * 3 * This is based largely upon crypto/sha256_generic.c 4 * 5 * Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com> 6 * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk> 7 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au> 8 * SHA224 Support Copyright 2007 Intel Corporation <jonathan.lynch@intel.com> 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/cryptohash.h> 18 #include <linux/types.h> 19 #include <crypto/sha.h> 20 21 #include <asm/pstate.h> 22 #include <asm/elf.h> 23 24 #include "opcodes.h" 25 26 asmlinkage void sha256_sparc64_transform(u32 *digest, const char *data, 27 unsigned int rounds); 28 29 static int sha224_sparc64_init(struct shash_desc *desc) 30 { 31 struct sha256_state *sctx = shash_desc_ctx(desc); 32 sctx->state[0] = SHA224_H0; 33 sctx->state[1] = SHA224_H1; 34 sctx->state[2] = SHA224_H2; 35 sctx->state[3] = SHA224_H3; 36 sctx->state[4] = SHA224_H4; 37 sctx->state[5] = SHA224_H5; 38 sctx->state[6] = SHA224_H6; 39 sctx->state[7] = SHA224_H7; 40 sctx->count = 0; 41 42 return 0; 43 } 44 45 static int sha256_sparc64_init(struct shash_desc *desc) 46 { 47 struct sha256_state *sctx = shash_desc_ctx(desc); 48 sctx->state[0] = SHA256_H0; 49 sctx->state[1] = SHA256_H1; 50 sctx->state[2] = SHA256_H2; 51 sctx->state[3] = SHA256_H3; 52 sctx->state[4] = SHA256_H4; 53 sctx->state[5] = SHA256_H5; 54 sctx->state[6] = SHA256_H6; 55 sctx->state[7] = SHA256_H7; 56 sctx->count = 0; 57 58 return 0; 59 } 60 61 static void __sha256_sparc64_update(struct sha256_state *sctx, const u8 *data, 62 unsigned int len, unsigned int partial) 63 { 64 unsigned int done = 0; 65 66 sctx->count += len; 67 if (partial) { 68 done = SHA256_BLOCK_SIZE - partial; 69 memcpy(sctx->buf + partial, data, done); 70 sha256_sparc64_transform(sctx->state, sctx->buf, 1); 71 } 72 if (len - done >= SHA256_BLOCK_SIZE) { 73 const unsigned int rounds = (len - done) / SHA256_BLOCK_SIZE; 74 75 sha256_sparc64_transform(sctx->state, data + done, rounds); 76 done += rounds * SHA256_BLOCK_SIZE; 77 } 78 79 memcpy(sctx->buf, data + done, len - done); 80 } 81 82 static int sha256_sparc64_update(struct shash_desc *desc, const u8 *data, 83 unsigned int len) 84 { 85 struct sha256_state *sctx = shash_desc_ctx(desc); 86 unsigned int partial = sctx->count % SHA256_BLOCK_SIZE; 87 88 /* Handle the fast case right here */ 89 if (partial + len < SHA256_BLOCK_SIZE) { 90 sctx->count += len; 91 memcpy(sctx->buf + partial, data, len); 92 } else 93 __sha256_sparc64_update(sctx, data, len, partial); 94 95 return 0; 96 } 97 98 static int sha256_sparc64_final(struct shash_desc *desc, u8 *out) 99 { 100 struct sha256_state *sctx = shash_desc_ctx(desc); 101 unsigned int i, index, padlen; 102 __be32 *dst = (__be32 *)out; 103 __be64 bits; 104 static const u8 padding[SHA256_BLOCK_SIZE] = { 0x80, }; 105 106 bits = cpu_to_be64(sctx->count << 3); 107 108 /* Pad out to 56 mod 64 and append length */ 109 index = sctx->count % SHA256_BLOCK_SIZE; 110 padlen = (index < 56) ? (56 - index) : ((SHA256_BLOCK_SIZE+56) - index); 111 112 /* We need to fill a whole block for __sha256_sparc64_update() */ 113 if (padlen <= 56) { 114 sctx->count += padlen; 115 memcpy(sctx->buf + index, padding, padlen); 116 } else { 117 __sha256_sparc64_update(sctx, padding, padlen, index); 118 } 119 __sha256_sparc64_update(sctx, (const u8 *)&bits, sizeof(bits), 56); 120 121 /* Store state in digest */ 122 for (i = 0; i < 8; i++) 123 dst[i] = cpu_to_be32(sctx->state[i]); 124 125 /* Wipe context */ 126 memset(sctx, 0, sizeof(*sctx)); 127 128 return 0; 129 } 130 131 static int sha224_sparc64_final(struct shash_desc *desc, u8 *hash) 132 { 133 u8 D[SHA256_DIGEST_SIZE]; 134 135 sha256_sparc64_final(desc, D); 136 137 memcpy(hash, D, SHA224_DIGEST_SIZE); 138 memzero_explicit(D, SHA256_DIGEST_SIZE); 139 140 return 0; 141 } 142 143 static int sha256_sparc64_export(struct shash_desc *desc, void *out) 144 { 145 struct sha256_state *sctx = shash_desc_ctx(desc); 146 147 memcpy(out, sctx, sizeof(*sctx)); 148 return 0; 149 } 150 151 static int sha256_sparc64_import(struct shash_desc *desc, const void *in) 152 { 153 struct sha256_state *sctx = shash_desc_ctx(desc); 154 155 memcpy(sctx, in, sizeof(*sctx)); 156 return 0; 157 } 158 159 static struct shash_alg sha256 = { 160 .digestsize = SHA256_DIGEST_SIZE, 161 .init = sha256_sparc64_init, 162 .update = sha256_sparc64_update, 163 .final = sha256_sparc64_final, 164 .export = sha256_sparc64_export, 165 .import = sha256_sparc64_import, 166 .descsize = sizeof(struct sha256_state), 167 .statesize = sizeof(struct sha256_state), 168 .base = { 169 .cra_name = "sha256", 170 .cra_driver_name= "sha256-sparc64", 171 .cra_priority = SPARC_CR_OPCODE_PRIORITY, 172 .cra_flags = CRYPTO_ALG_TYPE_SHASH, 173 .cra_blocksize = SHA256_BLOCK_SIZE, 174 .cra_module = THIS_MODULE, 175 } 176 }; 177 178 static struct shash_alg sha224 = { 179 .digestsize = SHA224_DIGEST_SIZE, 180 .init = sha224_sparc64_init, 181 .update = sha256_sparc64_update, 182 .final = sha224_sparc64_final, 183 .descsize = sizeof(struct sha256_state), 184 .base = { 185 .cra_name = "sha224", 186 .cra_driver_name= "sha224-sparc64", 187 .cra_priority = SPARC_CR_OPCODE_PRIORITY, 188 .cra_flags = CRYPTO_ALG_TYPE_SHASH, 189 .cra_blocksize = SHA224_BLOCK_SIZE, 190 .cra_module = THIS_MODULE, 191 } 192 }; 193 194 static bool __init sparc64_has_sha256_opcode(void) 195 { 196 unsigned long cfr; 197 198 if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO)) 199 return false; 200 201 __asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr)); 202 if (!(cfr & CFR_SHA256)) 203 return false; 204 205 return true; 206 } 207 208 static int __init sha256_sparc64_mod_init(void) 209 { 210 if (sparc64_has_sha256_opcode()) { 211 int ret = crypto_register_shash(&sha224); 212 if (ret < 0) 213 return ret; 214 215 ret = crypto_register_shash(&sha256); 216 if (ret < 0) { 217 crypto_unregister_shash(&sha224); 218 return ret; 219 } 220 221 pr_info("Using sparc64 sha256 opcode optimized SHA-256/SHA-224 implementation\n"); 222 return 0; 223 } 224 pr_info("sparc64 sha256 opcode not available.\n"); 225 return -ENODEV; 226 } 227 228 static void __exit sha256_sparc64_mod_fini(void) 229 { 230 crypto_unregister_shash(&sha224); 231 crypto_unregister_shash(&sha256); 232 } 233 234 module_init(sha256_sparc64_mod_init); 235 module_exit(sha256_sparc64_mod_fini); 236 237 MODULE_LICENSE("GPL"); 238 MODULE_DESCRIPTION("SHA-224 and SHA-256 Secure Hash Algorithm, sparc64 sha256 opcode accelerated"); 239 240 MODULE_ALIAS_CRYPTO("sha224"); 241 MODULE_ALIAS_CRYPTO("sha256"); 242 243 #include "crop_devid.c" 244