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/types.h> 18 #include <crypto/sha2.h> 19 #include <crypto/sha512_base.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 void __sha512_sparc64_update(struct sha512_state *sctx, const u8 *data, 30 unsigned int len, unsigned int partial) 31 { 32 unsigned int done = 0; 33 34 if ((sctx->count[0] += len) < len) 35 sctx->count[1]++; 36 if (partial) { 37 done = SHA512_BLOCK_SIZE - partial; 38 memcpy(sctx->buf + partial, data, done); 39 sha512_sparc64_transform(sctx->state, sctx->buf, 1); 40 } 41 if (len - done >= SHA512_BLOCK_SIZE) { 42 const unsigned int rounds = (len - done) / SHA512_BLOCK_SIZE; 43 44 sha512_sparc64_transform(sctx->state, data + done, rounds); 45 done += rounds * SHA512_BLOCK_SIZE; 46 } 47 48 memcpy(sctx->buf, data + done, len - done); 49 } 50 51 static int sha512_sparc64_update(struct shash_desc *desc, const u8 *data, 52 unsigned int len) 53 { 54 struct sha512_state *sctx = shash_desc_ctx(desc); 55 unsigned int partial = sctx->count[0] % SHA512_BLOCK_SIZE; 56 57 /* Handle the fast case right here */ 58 if (partial + len < SHA512_BLOCK_SIZE) { 59 if ((sctx->count[0] += len) < len) 60 sctx->count[1]++; 61 memcpy(sctx->buf + partial, data, len); 62 } else 63 __sha512_sparc64_update(sctx, data, len, partial); 64 65 return 0; 66 } 67 68 static int sha512_sparc64_final(struct shash_desc *desc, u8 *out) 69 { 70 struct sha512_state *sctx = shash_desc_ctx(desc); 71 unsigned int i, index, padlen; 72 __be64 *dst = (__be64 *)out; 73 __be64 bits[2]; 74 static const u8 padding[SHA512_BLOCK_SIZE] = { 0x80, }; 75 76 /* Save number of bits */ 77 bits[1] = cpu_to_be64(sctx->count[0] << 3); 78 bits[0] = cpu_to_be64(sctx->count[1] << 3 | sctx->count[0] >> 61); 79 80 /* Pad out to 112 mod 128 and append length */ 81 index = sctx->count[0] % SHA512_BLOCK_SIZE; 82 padlen = (index < 112) ? (112 - index) : ((SHA512_BLOCK_SIZE+112) - index); 83 84 /* We need to fill a whole block for __sha512_sparc64_update() */ 85 if (padlen <= 112) { 86 if ((sctx->count[0] += padlen) < padlen) 87 sctx->count[1]++; 88 memcpy(sctx->buf + index, padding, padlen); 89 } else { 90 __sha512_sparc64_update(sctx, padding, padlen, index); 91 } 92 __sha512_sparc64_update(sctx, (const u8 *)&bits, sizeof(bits), 112); 93 94 /* Store state in digest */ 95 for (i = 0; i < 8; i++) 96 dst[i] = cpu_to_be64(sctx->state[i]); 97 98 /* Wipe context */ 99 memset(sctx, 0, sizeof(*sctx)); 100 101 return 0; 102 } 103 104 static int sha384_sparc64_final(struct shash_desc *desc, u8 *hash) 105 { 106 u8 D[64]; 107 108 sha512_sparc64_final(desc, D); 109 110 memcpy(hash, D, 48); 111 memzero_explicit(D, 64); 112 113 return 0; 114 } 115 116 static struct shash_alg sha512 = { 117 .digestsize = SHA512_DIGEST_SIZE, 118 .init = sha512_base_init, 119 .update = sha512_sparc64_update, 120 .final = sha512_sparc64_final, 121 .descsize = sizeof(struct sha512_state), 122 .base = { 123 .cra_name = "sha512", 124 .cra_driver_name= "sha512-sparc64", 125 .cra_priority = SPARC_CR_OPCODE_PRIORITY, 126 .cra_blocksize = SHA512_BLOCK_SIZE, 127 .cra_module = THIS_MODULE, 128 } 129 }; 130 131 static struct shash_alg sha384 = { 132 .digestsize = SHA384_DIGEST_SIZE, 133 .init = sha384_base_init, 134 .update = sha512_sparc64_update, 135 .final = sha384_sparc64_final, 136 .descsize = sizeof(struct sha512_state), 137 .base = { 138 .cra_name = "sha384", 139 .cra_driver_name= "sha384-sparc64", 140 .cra_priority = SPARC_CR_OPCODE_PRIORITY, 141 .cra_blocksize = SHA384_BLOCK_SIZE, 142 .cra_module = THIS_MODULE, 143 } 144 }; 145 146 static bool __init sparc64_has_sha512_opcode(void) 147 { 148 unsigned long cfr; 149 150 if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO)) 151 return false; 152 153 __asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr)); 154 if (!(cfr & CFR_SHA512)) 155 return false; 156 157 return true; 158 } 159 160 static int __init sha512_sparc64_mod_init(void) 161 { 162 if (sparc64_has_sha512_opcode()) { 163 int ret = crypto_register_shash(&sha384); 164 if (ret < 0) 165 return ret; 166 167 ret = crypto_register_shash(&sha512); 168 if (ret < 0) { 169 crypto_unregister_shash(&sha384); 170 return ret; 171 } 172 173 pr_info("Using sparc64 sha512 opcode optimized SHA-512/SHA-384 implementation\n"); 174 return 0; 175 } 176 pr_info("sparc64 sha512 opcode not available.\n"); 177 return -ENODEV; 178 } 179 180 static void __exit sha512_sparc64_mod_fini(void) 181 { 182 crypto_unregister_shash(&sha384); 183 crypto_unregister_shash(&sha512); 184 } 185 186 module_init(sha512_sparc64_mod_init); 187 module_exit(sha512_sparc64_mod_fini); 188 189 MODULE_LICENSE("GPL"); 190 MODULE_DESCRIPTION("SHA-384 and SHA-512 Secure Hash Algorithm, sparc64 sha512 opcode accelerated"); 191 192 MODULE_ALIAS_CRYPTO("sha384"); 193 MODULE_ALIAS_CRYPTO("sha512"); 194 195 #include "crop_devid.c" 196