1 // SPDX-License-Identifier: GPL-2.0-only 2 /* Glue code for SHA256 hashing optimized for sparc64 crypto opcodes. 3 * 4 * This is based largely upon crypto/sha256_generic.c 5 * 6 * Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com> 7 * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk> 8 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au> 9 * SHA224 Support Copyright 2007 Intel Corporation <jonathan.lynch@intel.com> 10 */ 11 12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 13 14 #include <crypto/internal/hash.h> 15 #include <linux/init.h> 16 #include <linux/module.h> 17 #include <linux/mm.h> 18 #include <linux/types.h> 19 #include <crypto/sha2.h> 20 #include <crypto/sha256_base.h> 21 22 #include <asm/pstate.h> 23 #include <asm/elf.h> 24 25 #include "opcodes.h" 26 27 asmlinkage void sha256_sparc64_transform(u32 *digest, const char *data, 28 unsigned int rounds); 29 30 static void __sha256_sparc64_update(struct sha256_state *sctx, const u8 *data, 31 unsigned int len, unsigned int partial) 32 { 33 unsigned int done = 0; 34 35 sctx->count += len; 36 if (partial) { 37 done = SHA256_BLOCK_SIZE - partial; 38 memcpy(sctx->buf + partial, data, done); 39 sha256_sparc64_transform(sctx->state, sctx->buf, 1); 40 } 41 if (len - done >= SHA256_BLOCK_SIZE) { 42 const unsigned int rounds = (len - done) / SHA256_BLOCK_SIZE; 43 44 sha256_sparc64_transform(sctx->state, data + done, rounds); 45 done += rounds * SHA256_BLOCK_SIZE; 46 } 47 48 memcpy(sctx->buf, data + done, len - done); 49 } 50 51 static int sha256_sparc64_update(struct shash_desc *desc, const u8 *data, 52 unsigned int len) 53 { 54 struct sha256_state *sctx = shash_desc_ctx(desc); 55 unsigned int partial = sctx->count % SHA256_BLOCK_SIZE; 56 57 /* Handle the fast case right here */ 58 if (partial + len < SHA256_BLOCK_SIZE) { 59 sctx->count += len; 60 memcpy(sctx->buf + partial, data, len); 61 } else 62 __sha256_sparc64_update(sctx, data, len, partial); 63 64 return 0; 65 } 66 67 static int sha256_sparc64_final(struct shash_desc *desc, u8 *out) 68 { 69 struct sha256_state *sctx = shash_desc_ctx(desc); 70 unsigned int i, index, padlen; 71 __be32 *dst = (__be32 *)out; 72 __be64 bits; 73 static const u8 padding[SHA256_BLOCK_SIZE] = { 0x80, }; 74 75 bits = cpu_to_be64(sctx->count << 3); 76 77 /* Pad out to 56 mod 64 and append length */ 78 index = sctx->count % SHA256_BLOCK_SIZE; 79 padlen = (index < 56) ? (56 - index) : ((SHA256_BLOCK_SIZE+56) - index); 80 81 /* We need to fill a whole block for __sha256_sparc64_update() */ 82 if (padlen <= 56) { 83 sctx->count += padlen; 84 memcpy(sctx->buf + index, padding, padlen); 85 } else { 86 __sha256_sparc64_update(sctx, padding, padlen, index); 87 } 88 __sha256_sparc64_update(sctx, (const u8 *)&bits, sizeof(bits), 56); 89 90 /* Store state in digest */ 91 for (i = 0; i < 8; i++) 92 dst[i] = cpu_to_be32(sctx->state[i]); 93 94 /* Wipe context */ 95 memset(sctx, 0, sizeof(*sctx)); 96 97 return 0; 98 } 99 100 static int sha224_sparc64_final(struct shash_desc *desc, u8 *hash) 101 { 102 u8 D[SHA256_DIGEST_SIZE]; 103 104 sha256_sparc64_final(desc, D); 105 106 memcpy(hash, D, SHA224_DIGEST_SIZE); 107 memzero_explicit(D, SHA256_DIGEST_SIZE); 108 109 return 0; 110 } 111 112 static int sha256_sparc64_export(struct shash_desc *desc, void *out) 113 { 114 struct sha256_state *sctx = shash_desc_ctx(desc); 115 116 memcpy(out, sctx, sizeof(*sctx)); 117 return 0; 118 } 119 120 static int sha256_sparc64_import(struct shash_desc *desc, const void *in) 121 { 122 struct sha256_state *sctx = shash_desc_ctx(desc); 123 124 memcpy(sctx, in, sizeof(*sctx)); 125 return 0; 126 } 127 128 static struct shash_alg sha256_alg = { 129 .digestsize = SHA256_DIGEST_SIZE, 130 .init = sha256_base_init, 131 .update = sha256_sparc64_update, 132 .final = sha256_sparc64_final, 133 .export = sha256_sparc64_export, 134 .import = sha256_sparc64_import, 135 .descsize = sizeof(struct sha256_state), 136 .statesize = sizeof(struct sha256_state), 137 .base = { 138 .cra_name = "sha256", 139 .cra_driver_name= "sha256-sparc64", 140 .cra_priority = SPARC_CR_OPCODE_PRIORITY, 141 .cra_blocksize = SHA256_BLOCK_SIZE, 142 .cra_module = THIS_MODULE, 143 } 144 }; 145 146 static struct shash_alg sha224_alg = { 147 .digestsize = SHA224_DIGEST_SIZE, 148 .init = sha224_base_init, 149 .update = sha256_sparc64_update, 150 .final = sha224_sparc64_final, 151 .descsize = sizeof(struct sha256_state), 152 .base = { 153 .cra_name = "sha224", 154 .cra_driver_name= "sha224-sparc64", 155 .cra_priority = SPARC_CR_OPCODE_PRIORITY, 156 .cra_blocksize = SHA224_BLOCK_SIZE, 157 .cra_module = THIS_MODULE, 158 } 159 }; 160 161 static bool __init sparc64_has_sha256_opcode(void) 162 { 163 unsigned long cfr; 164 165 if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO)) 166 return false; 167 168 __asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr)); 169 if (!(cfr & CFR_SHA256)) 170 return false; 171 172 return true; 173 } 174 175 static int __init sha256_sparc64_mod_init(void) 176 { 177 if (sparc64_has_sha256_opcode()) { 178 int ret = crypto_register_shash(&sha224_alg); 179 if (ret < 0) 180 return ret; 181 182 ret = crypto_register_shash(&sha256_alg); 183 if (ret < 0) { 184 crypto_unregister_shash(&sha224_alg); 185 return ret; 186 } 187 188 pr_info("Using sparc64 sha256 opcode optimized SHA-256/SHA-224 implementation\n"); 189 return 0; 190 } 191 pr_info("sparc64 sha256 opcode not available.\n"); 192 return -ENODEV; 193 } 194 195 static void __exit sha256_sparc64_mod_fini(void) 196 { 197 crypto_unregister_shash(&sha224_alg); 198 crypto_unregister_shash(&sha256_alg); 199 } 200 201 module_init(sha256_sparc64_mod_init); 202 module_exit(sha256_sparc64_mod_fini); 203 204 MODULE_LICENSE("GPL"); 205 MODULE_DESCRIPTION("SHA-224 and SHA-256 Secure Hash Algorithm, sparc64 sha256 opcode accelerated"); 206 207 MODULE_ALIAS_CRYPTO("sha224"); 208 MODULE_ALIAS_CRYPTO("sha256"); 209 210 #include "crop_devid.c" 211