1 // SPDX-License-Identifier: GPL-2.0-only 2 /* Glue code for SHA1 hashing optimized for sparc64 crypto opcodes. 3 * 4 * This is based largely upon arch/x86/crypto/sha1_ssse3_glue.c 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 */ 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/cryptohash.h> 19 #include <linux/types.h> 20 #include <crypto/sha.h> 21 22 #include <asm/pstate.h> 23 #include <asm/elf.h> 24 25 #include "opcodes.h" 26 27 asmlinkage void sha1_sparc64_transform(u32 *digest, const char *data, 28 unsigned int rounds); 29 30 static int sha1_sparc64_init(struct shash_desc *desc) 31 { 32 struct sha1_state *sctx = shash_desc_ctx(desc); 33 34 *sctx = (struct sha1_state){ 35 .state = { SHA1_H0, SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4 }, 36 }; 37 38 return 0; 39 } 40 41 static void __sha1_sparc64_update(struct sha1_state *sctx, const u8 *data, 42 unsigned int len, unsigned int partial) 43 { 44 unsigned int done = 0; 45 46 sctx->count += len; 47 if (partial) { 48 done = SHA1_BLOCK_SIZE - partial; 49 memcpy(sctx->buffer + partial, data, done); 50 sha1_sparc64_transform(sctx->state, sctx->buffer, 1); 51 } 52 if (len - done >= SHA1_BLOCK_SIZE) { 53 const unsigned int rounds = (len - done) / SHA1_BLOCK_SIZE; 54 55 sha1_sparc64_transform(sctx->state, data + done, rounds); 56 done += rounds * SHA1_BLOCK_SIZE; 57 } 58 59 memcpy(sctx->buffer, data + done, len - done); 60 } 61 62 static int sha1_sparc64_update(struct shash_desc *desc, const u8 *data, 63 unsigned int len) 64 { 65 struct sha1_state *sctx = shash_desc_ctx(desc); 66 unsigned int partial = sctx->count % SHA1_BLOCK_SIZE; 67 68 /* Handle the fast case right here */ 69 if (partial + len < SHA1_BLOCK_SIZE) { 70 sctx->count += len; 71 memcpy(sctx->buffer + partial, data, len); 72 } else 73 __sha1_sparc64_update(sctx, data, len, partial); 74 75 return 0; 76 } 77 78 /* Add padding and return the message digest. */ 79 static int sha1_sparc64_final(struct shash_desc *desc, u8 *out) 80 { 81 struct sha1_state *sctx = shash_desc_ctx(desc); 82 unsigned int i, index, padlen; 83 __be32 *dst = (__be32 *)out; 84 __be64 bits; 85 static const u8 padding[SHA1_BLOCK_SIZE] = { 0x80, }; 86 87 bits = cpu_to_be64(sctx->count << 3); 88 89 /* Pad out to 56 mod 64 and append length */ 90 index = sctx->count % SHA1_BLOCK_SIZE; 91 padlen = (index < 56) ? (56 - index) : ((SHA1_BLOCK_SIZE+56) - index); 92 93 /* We need to fill a whole block for __sha1_sparc64_update() */ 94 if (padlen <= 56) { 95 sctx->count += padlen; 96 memcpy(sctx->buffer + index, padding, padlen); 97 } else { 98 __sha1_sparc64_update(sctx, padding, padlen, index); 99 } 100 __sha1_sparc64_update(sctx, (const u8 *)&bits, sizeof(bits), 56); 101 102 /* Store state in digest */ 103 for (i = 0; i < 5; i++) 104 dst[i] = cpu_to_be32(sctx->state[i]); 105 106 /* Wipe context */ 107 memset(sctx, 0, sizeof(*sctx)); 108 109 return 0; 110 } 111 112 static int sha1_sparc64_export(struct shash_desc *desc, void *out) 113 { 114 struct sha1_state *sctx = shash_desc_ctx(desc); 115 116 memcpy(out, sctx, sizeof(*sctx)); 117 118 return 0; 119 } 120 121 static int sha1_sparc64_import(struct shash_desc *desc, const void *in) 122 { 123 struct sha1_state *sctx = shash_desc_ctx(desc); 124 125 memcpy(sctx, in, sizeof(*sctx)); 126 127 return 0; 128 } 129 130 static struct shash_alg alg = { 131 .digestsize = SHA1_DIGEST_SIZE, 132 .init = sha1_sparc64_init, 133 .update = sha1_sparc64_update, 134 .final = sha1_sparc64_final, 135 .export = sha1_sparc64_export, 136 .import = sha1_sparc64_import, 137 .descsize = sizeof(struct sha1_state), 138 .statesize = sizeof(struct sha1_state), 139 .base = { 140 .cra_name = "sha1", 141 .cra_driver_name= "sha1-sparc64", 142 .cra_priority = SPARC_CR_OPCODE_PRIORITY, 143 .cra_blocksize = SHA1_BLOCK_SIZE, 144 .cra_module = THIS_MODULE, 145 } 146 }; 147 148 static bool __init sparc64_has_sha1_opcode(void) 149 { 150 unsigned long cfr; 151 152 if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO)) 153 return false; 154 155 __asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr)); 156 if (!(cfr & CFR_SHA1)) 157 return false; 158 159 return true; 160 } 161 162 static int __init sha1_sparc64_mod_init(void) 163 { 164 if (sparc64_has_sha1_opcode()) { 165 pr_info("Using sparc64 sha1 opcode optimized SHA-1 implementation\n"); 166 return crypto_register_shash(&alg); 167 } 168 pr_info("sparc64 sha1 opcode not available.\n"); 169 return -ENODEV; 170 } 171 172 static void __exit sha1_sparc64_mod_fini(void) 173 { 174 crypto_unregister_shash(&alg); 175 } 176 177 module_init(sha1_sparc64_mod_init); 178 module_exit(sha1_sparc64_mod_fini); 179 180 MODULE_LICENSE("GPL"); 181 MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm, sparc64 sha1 opcode accelerated"); 182 183 MODULE_ALIAS_CRYPTO("sha1"); 184 185 #include "crop_devid.c" 186