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