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/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 sha512_sparc64_transform(u64 *digest, const char *data, 27 unsigned int rounds); 28 29 static int sha512_sparc64_init(struct shash_desc *desc) 30 { 31 struct sha512_state *sctx = shash_desc_ctx(desc); 32 sctx->state[0] = SHA512_H0; 33 sctx->state[1] = SHA512_H1; 34 sctx->state[2] = SHA512_H2; 35 sctx->state[3] = SHA512_H3; 36 sctx->state[4] = SHA512_H4; 37 sctx->state[5] = SHA512_H5; 38 sctx->state[6] = SHA512_H6; 39 sctx->state[7] = SHA512_H7; 40 sctx->count[0] = sctx->count[1] = 0; 41 42 return 0; 43 } 44 45 static int sha384_sparc64_init(struct shash_desc *desc) 46 { 47 struct sha512_state *sctx = shash_desc_ctx(desc); 48 sctx->state[0] = SHA384_H0; 49 sctx->state[1] = SHA384_H1; 50 sctx->state[2] = SHA384_H2; 51 sctx->state[3] = SHA384_H3; 52 sctx->state[4] = SHA384_H4; 53 sctx->state[5] = SHA384_H5; 54 sctx->state[6] = SHA384_H6; 55 sctx->state[7] = SHA384_H7; 56 sctx->count[0] = sctx->count[1] = 0; 57 58 return 0; 59 } 60 61 static void __sha512_sparc64_update(struct sha512_state *sctx, const u8 *data, 62 unsigned int len, unsigned int partial) 63 { 64 unsigned int done = 0; 65 66 if ((sctx->count[0] += len) < len) 67 sctx->count[1]++; 68 if (partial) { 69 done = SHA512_BLOCK_SIZE - partial; 70 memcpy(sctx->buf + partial, data, done); 71 sha512_sparc64_transform(sctx->state, sctx->buf, 1); 72 } 73 if (len - done >= SHA512_BLOCK_SIZE) { 74 const unsigned int rounds = (len - done) / SHA512_BLOCK_SIZE; 75 76 sha512_sparc64_transform(sctx->state, data + done, rounds); 77 done += rounds * SHA512_BLOCK_SIZE; 78 } 79 80 memcpy(sctx->buf, data + done, len - done); 81 } 82 83 static int sha512_sparc64_update(struct shash_desc *desc, const u8 *data, 84 unsigned int len) 85 { 86 struct sha512_state *sctx = shash_desc_ctx(desc); 87 unsigned int partial = sctx->count[0] % SHA512_BLOCK_SIZE; 88 89 /* Handle the fast case right here */ 90 if (partial + len < SHA512_BLOCK_SIZE) { 91 if ((sctx->count[0] += len) < len) 92 sctx->count[1]++; 93 memcpy(sctx->buf + partial, data, len); 94 } else 95 __sha512_sparc64_update(sctx, data, len, partial); 96 97 return 0; 98 } 99 100 static int sha512_sparc64_final(struct shash_desc *desc, u8 *out) 101 { 102 struct sha512_state *sctx = shash_desc_ctx(desc); 103 unsigned int i, index, padlen; 104 __be64 *dst = (__be64 *)out; 105 __be64 bits[2]; 106 static const u8 padding[SHA512_BLOCK_SIZE] = { 0x80, }; 107 108 /* Save number of bits */ 109 bits[1] = cpu_to_be64(sctx->count[0] << 3); 110 bits[0] = cpu_to_be64(sctx->count[1] << 3 | sctx->count[0] >> 61); 111 112 /* Pad out to 112 mod 128 and append length */ 113 index = sctx->count[0] % SHA512_BLOCK_SIZE; 114 padlen = (index < 112) ? (112 - index) : ((SHA512_BLOCK_SIZE+112) - index); 115 116 /* We need to fill a whole block for __sha512_sparc64_update() */ 117 if (padlen <= 112) { 118 if ((sctx->count[0] += padlen) < padlen) 119 sctx->count[1]++; 120 memcpy(sctx->buf + index, padding, padlen); 121 } else { 122 __sha512_sparc64_update(sctx, padding, padlen, index); 123 } 124 __sha512_sparc64_update(sctx, (const u8 *)&bits, sizeof(bits), 112); 125 126 /* Store state in digest */ 127 for (i = 0; i < 8; i++) 128 dst[i] = cpu_to_be64(sctx->state[i]); 129 130 /* Wipe context */ 131 memset(sctx, 0, sizeof(*sctx)); 132 133 return 0; 134 } 135 136 static int sha384_sparc64_final(struct shash_desc *desc, u8 *hash) 137 { 138 u8 D[64]; 139 140 sha512_sparc64_final(desc, D); 141 142 memcpy(hash, D, 48); 143 memzero_explicit(D, 64); 144 145 return 0; 146 } 147 148 static struct shash_alg sha512 = { 149 .digestsize = SHA512_DIGEST_SIZE, 150 .init = sha512_sparc64_init, 151 .update = sha512_sparc64_update, 152 .final = sha512_sparc64_final, 153 .descsize = sizeof(struct sha512_state), 154 .base = { 155 .cra_name = "sha512", 156 .cra_driver_name= "sha512-sparc64", 157 .cra_priority = SPARC_CR_OPCODE_PRIORITY, 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_blocksize = SHA384_BLOCK_SIZE, 174 .cra_module = THIS_MODULE, 175 } 176 }; 177 178 static bool __init sparc64_has_sha512_opcode(void) 179 { 180 unsigned long cfr; 181 182 if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO)) 183 return false; 184 185 __asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr)); 186 if (!(cfr & CFR_SHA512)) 187 return false; 188 189 return true; 190 } 191 192 static int __init sha512_sparc64_mod_init(void) 193 { 194 if (sparc64_has_sha512_opcode()) { 195 int ret = crypto_register_shash(&sha384); 196 if (ret < 0) 197 return ret; 198 199 ret = crypto_register_shash(&sha512); 200 if (ret < 0) { 201 crypto_unregister_shash(&sha384); 202 return ret; 203 } 204 205 pr_info("Using sparc64 sha512 opcode optimized SHA-512/SHA-384 implementation\n"); 206 return 0; 207 } 208 pr_info("sparc64 sha512 opcode not available.\n"); 209 return -ENODEV; 210 } 211 212 static void __exit sha512_sparc64_mod_fini(void) 213 { 214 crypto_unregister_shash(&sha384); 215 crypto_unregister_shash(&sha512); 216 } 217 218 module_init(sha512_sparc64_mod_init); 219 module_exit(sha512_sparc64_mod_fini); 220 221 MODULE_LICENSE("GPL"); 222 MODULE_DESCRIPTION("SHA-384 and SHA-512 Secure Hash Algorithm, sparc64 sha512 opcode accelerated"); 223 224 MODULE_ALIAS_CRYPTO("sha384"); 225 MODULE_ALIAS_CRYPTO("sha512"); 226 227 #include "crop_devid.c" 228