1 /* Glue code for SHA512 hashing optimized for sparc64 crypto opcodes. 2 * 3 * This is based largely upon crypto/sha512_generic.c 4 * 5 * Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com> 6 * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk> 7 * Copyright (c) 2003 Kyle McMartin <kyle@debian.org> 8 */ 9 10 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 11 12 #include <crypto/internal/hash.h> 13 #include <linux/init.h> 14 #include <linux/module.h> 15 #include <linux/mm.h> 16 #include <linux/cryptohash.h> 17 #include <linux/types.h> 18 #include <crypto/sha.h> 19 20 #include <asm/pstate.h> 21 #include <asm/elf.h> 22 23 #include "opcodes.h" 24 25 asmlinkage void sha512_sparc64_transform(u64 *digest, const char *data, 26 unsigned int rounds); 27 28 static 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 44 static 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 60 static 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 82 static 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 99 static 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 } 134 135 static 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 memset(D, 0, 64); 143 144 return 0; 145 } 146 147 static 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_flags = CRYPTO_ALG_TYPE_SHASH, 158 .cra_blocksize = SHA512_BLOCK_SIZE, 159 .cra_module = THIS_MODULE, 160 } 161 }; 162 163 static struct shash_alg sha384 = { 164 .digestsize = SHA384_DIGEST_SIZE, 165 .init = sha384_sparc64_init, 166 .update = sha512_sparc64_update, 167 .final = sha384_sparc64_final, 168 .descsize = sizeof(struct sha512_state), 169 .base = { 170 .cra_name = "sha384", 171 .cra_driver_name= "sha384-sparc64", 172 .cra_priority = SPARC_CR_OPCODE_PRIORITY, 173 .cra_flags = CRYPTO_ALG_TYPE_SHASH, 174 .cra_blocksize = SHA384_BLOCK_SIZE, 175 .cra_module = THIS_MODULE, 176 } 177 }; 178 179 static bool __init sparc64_has_sha512_opcode(void) 180 { 181 unsigned long cfr; 182 183 if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO)) 184 return false; 185 186 __asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr)); 187 if (!(cfr & CFR_SHA512)) 188 return false; 189 190 return true; 191 } 192 193 static int __init sha512_sparc64_mod_init(void) 194 { 195 if (sparc64_has_sha512_opcode()) { 196 int ret = crypto_register_shash(&sha384); 197 if (ret < 0) 198 return ret; 199 200 ret = crypto_register_shash(&sha512); 201 if (ret < 0) { 202 crypto_unregister_shash(&sha384); 203 return ret; 204 } 205 206 pr_info("Using sparc64 sha512 opcode optimized SHA-512/SHA-384 implementation\n"); 207 return 0; 208 } 209 pr_info("sparc64 sha512 opcode not available.\n"); 210 return -ENODEV; 211 } 212 213 static void __exit sha512_sparc64_mod_fini(void) 214 { 215 crypto_unregister_shash(&sha384); 216 crypto_unregister_shash(&sha512); 217 } 218 219 module_init(sha512_sparc64_mod_init); 220 module_exit(sha512_sparc64_mod_fini); 221 222 MODULE_LICENSE("GPL"); 223 MODULE_DESCRIPTION("SHA-384 and SHA-512 Secure Hash Algorithm, sparc64 sha512 opcode accelerated"); 224 225 MODULE_ALIAS("sha384"); 226 MODULE_ALIAS("sha512"); 227 228 #include "crop_devid.c" 229