1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * sha3-ce-glue.c - core SHA-3 transform using v8.2 Crypto Extensions 4 * 5 * Copyright (C) 2018 Linaro Ltd <ard.biesheuvel@linaro.org> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 */ 11 12 #include <asm/hwcap.h> 13 #include <asm/neon.h> 14 #include <asm/simd.h> 15 #include <asm/unaligned.h> 16 #include <crypto/internal/hash.h> 17 #include <crypto/sha3.h> 18 #include <linux/cpufeature.h> 19 #include <linux/crypto.h> 20 #include <linux/module.h> 21 22 MODULE_DESCRIPTION("SHA3 secure hash using ARMv8 Crypto Extensions"); 23 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>"); 24 MODULE_LICENSE("GPL v2"); 25 26 asmlinkage void sha3_ce_transform(u64 *st, const u8 *data, int blocks, 27 int md_len); 28 29 static int sha3_update(struct shash_desc *desc, const u8 *data, 30 unsigned int len) 31 { 32 struct sha3_state *sctx = shash_desc_ctx(desc); 33 unsigned int digest_size = crypto_shash_digestsize(desc->tfm); 34 35 if (!may_use_simd()) 36 return crypto_sha3_update(desc, data, len); 37 38 if ((sctx->partial + len) >= sctx->rsiz) { 39 int blocks; 40 41 if (sctx->partial) { 42 int p = sctx->rsiz - sctx->partial; 43 44 memcpy(sctx->buf + sctx->partial, data, p); 45 kernel_neon_begin(); 46 sha3_ce_transform(sctx->st, sctx->buf, 1, digest_size); 47 kernel_neon_end(); 48 49 data += p; 50 len -= p; 51 sctx->partial = 0; 52 } 53 54 blocks = len / sctx->rsiz; 55 len %= sctx->rsiz; 56 57 if (blocks) { 58 kernel_neon_begin(); 59 sha3_ce_transform(sctx->st, data, blocks, digest_size); 60 kernel_neon_end(); 61 data += blocks * sctx->rsiz; 62 } 63 } 64 65 if (len) { 66 memcpy(sctx->buf + sctx->partial, data, len); 67 sctx->partial += len; 68 } 69 return 0; 70 } 71 72 static int sha3_final(struct shash_desc *desc, u8 *out) 73 { 74 struct sha3_state *sctx = shash_desc_ctx(desc); 75 unsigned int digest_size = crypto_shash_digestsize(desc->tfm); 76 __le64 *digest = (__le64 *)out; 77 int i; 78 79 if (!may_use_simd()) 80 return crypto_sha3_final(desc, out); 81 82 sctx->buf[sctx->partial++] = 0x06; 83 memset(sctx->buf + sctx->partial, 0, sctx->rsiz - sctx->partial); 84 sctx->buf[sctx->rsiz - 1] |= 0x80; 85 86 kernel_neon_begin(); 87 sha3_ce_transform(sctx->st, sctx->buf, 1, digest_size); 88 kernel_neon_end(); 89 90 for (i = 0; i < digest_size / 8; i++) 91 put_unaligned_le64(sctx->st[i], digest++); 92 93 if (digest_size & 4) 94 put_unaligned_le32(sctx->st[i], (__le32 *)digest); 95 96 *sctx = (struct sha3_state){}; 97 return 0; 98 } 99 100 static struct shash_alg algs[] = { { 101 .digestsize = SHA3_224_DIGEST_SIZE, 102 .init = crypto_sha3_init, 103 .update = sha3_update, 104 .final = sha3_final, 105 .descsize = sizeof(struct sha3_state), 106 .base.cra_name = "sha3-224", 107 .base.cra_driver_name = "sha3-224-ce", 108 .base.cra_blocksize = SHA3_224_BLOCK_SIZE, 109 .base.cra_module = THIS_MODULE, 110 .base.cra_priority = 200, 111 }, { 112 .digestsize = SHA3_256_DIGEST_SIZE, 113 .init = crypto_sha3_init, 114 .update = sha3_update, 115 .final = sha3_final, 116 .descsize = sizeof(struct sha3_state), 117 .base.cra_name = "sha3-256", 118 .base.cra_driver_name = "sha3-256-ce", 119 .base.cra_blocksize = SHA3_256_BLOCK_SIZE, 120 .base.cra_module = THIS_MODULE, 121 .base.cra_priority = 200, 122 }, { 123 .digestsize = SHA3_384_DIGEST_SIZE, 124 .init = crypto_sha3_init, 125 .update = sha3_update, 126 .final = sha3_final, 127 .descsize = sizeof(struct sha3_state), 128 .base.cra_name = "sha3-384", 129 .base.cra_driver_name = "sha3-384-ce", 130 .base.cra_blocksize = SHA3_384_BLOCK_SIZE, 131 .base.cra_module = THIS_MODULE, 132 .base.cra_priority = 200, 133 }, { 134 .digestsize = SHA3_512_DIGEST_SIZE, 135 .init = crypto_sha3_init, 136 .update = sha3_update, 137 .final = sha3_final, 138 .descsize = sizeof(struct sha3_state), 139 .base.cra_name = "sha3-512", 140 .base.cra_driver_name = "sha3-512-ce", 141 .base.cra_blocksize = SHA3_512_BLOCK_SIZE, 142 .base.cra_module = THIS_MODULE, 143 .base.cra_priority = 200, 144 } }; 145 146 static int __init sha3_neon_mod_init(void) 147 { 148 return crypto_register_shashes(algs, ARRAY_SIZE(algs)); 149 } 150 151 static void __exit sha3_neon_mod_fini(void) 152 { 153 crypto_unregister_shashes(algs, ARRAY_SIZE(algs)); 154 } 155 156 module_cpu_feature_match(SHA3, sha3_neon_mod_init); 157 module_exit(sha3_neon_mod_fini); 158