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/internal/simd.h> 18 #include <crypto/sha3.h> 19 #include <linux/cpufeature.h> 20 #include <linux/crypto.h> 21 #include <linux/module.h> 22 23 MODULE_DESCRIPTION("SHA3 secure hash using ARMv8 Crypto Extensions"); 24 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>"); 25 MODULE_LICENSE("GPL v2"); 26 27 asmlinkage void sha3_ce_transform(u64 *st, const u8 *data, int blocks, 28 int md_len); 29 30 static int sha3_update(struct shash_desc *desc, const u8 *data, 31 unsigned int len) 32 { 33 struct sha3_state *sctx = shash_desc_ctx(desc); 34 unsigned int digest_size = crypto_shash_digestsize(desc->tfm); 35 36 if (!crypto_simd_usable()) 37 return crypto_sha3_update(desc, data, len); 38 39 if ((sctx->partial + len) >= sctx->rsiz) { 40 int blocks; 41 42 if (sctx->partial) { 43 int p = sctx->rsiz - sctx->partial; 44 45 memcpy(sctx->buf + sctx->partial, data, p); 46 kernel_neon_begin(); 47 sha3_ce_transform(sctx->st, sctx->buf, 1, digest_size); 48 kernel_neon_end(); 49 50 data += p; 51 len -= p; 52 sctx->partial = 0; 53 } 54 55 blocks = len / sctx->rsiz; 56 len %= sctx->rsiz; 57 58 if (blocks) { 59 kernel_neon_begin(); 60 sha3_ce_transform(sctx->st, data, blocks, digest_size); 61 kernel_neon_end(); 62 data += blocks * sctx->rsiz; 63 } 64 } 65 66 if (len) { 67 memcpy(sctx->buf + sctx->partial, data, len); 68 sctx->partial += len; 69 } 70 return 0; 71 } 72 73 static int sha3_final(struct shash_desc *desc, u8 *out) 74 { 75 struct sha3_state *sctx = shash_desc_ctx(desc); 76 unsigned int digest_size = crypto_shash_digestsize(desc->tfm); 77 __le64 *digest = (__le64 *)out; 78 int i; 79 80 if (!crypto_simd_usable()) 81 return crypto_sha3_final(desc, out); 82 83 sctx->buf[sctx->partial++] = 0x06; 84 memset(sctx->buf + sctx->partial, 0, sctx->rsiz - sctx->partial); 85 sctx->buf[sctx->rsiz - 1] |= 0x80; 86 87 kernel_neon_begin(); 88 sha3_ce_transform(sctx->st, sctx->buf, 1, digest_size); 89 kernel_neon_end(); 90 91 for (i = 0; i < digest_size / 8; i++) 92 put_unaligned_le64(sctx->st[i], digest++); 93 94 if (digest_size & 4) 95 put_unaligned_le32(sctx->st[i], (__le32 *)digest); 96 97 *sctx = (struct sha3_state){}; 98 return 0; 99 } 100 101 static struct shash_alg algs[] = { { 102 .digestsize = SHA3_224_DIGEST_SIZE, 103 .init = crypto_sha3_init, 104 .update = sha3_update, 105 .final = sha3_final, 106 .descsize = sizeof(struct sha3_state), 107 .base.cra_name = "sha3-224", 108 .base.cra_driver_name = "sha3-224-ce", 109 .base.cra_blocksize = SHA3_224_BLOCK_SIZE, 110 .base.cra_module = THIS_MODULE, 111 .base.cra_priority = 200, 112 }, { 113 .digestsize = SHA3_256_DIGEST_SIZE, 114 .init = crypto_sha3_init, 115 .update = sha3_update, 116 .final = sha3_final, 117 .descsize = sizeof(struct sha3_state), 118 .base.cra_name = "sha3-256", 119 .base.cra_driver_name = "sha3-256-ce", 120 .base.cra_blocksize = SHA3_256_BLOCK_SIZE, 121 .base.cra_module = THIS_MODULE, 122 .base.cra_priority = 200, 123 }, { 124 .digestsize = SHA3_384_DIGEST_SIZE, 125 .init = crypto_sha3_init, 126 .update = sha3_update, 127 .final = sha3_final, 128 .descsize = sizeof(struct sha3_state), 129 .base.cra_name = "sha3-384", 130 .base.cra_driver_name = "sha3-384-ce", 131 .base.cra_blocksize = SHA3_384_BLOCK_SIZE, 132 .base.cra_module = THIS_MODULE, 133 .base.cra_priority = 200, 134 }, { 135 .digestsize = SHA3_512_DIGEST_SIZE, 136 .init = crypto_sha3_init, 137 .update = sha3_update, 138 .final = sha3_final, 139 .descsize = sizeof(struct sha3_state), 140 .base.cra_name = "sha3-512", 141 .base.cra_driver_name = "sha3-512-ce", 142 .base.cra_blocksize = SHA3_512_BLOCK_SIZE, 143 .base.cra_module = THIS_MODULE, 144 .base.cra_priority = 200, 145 } }; 146 147 static int __init sha3_neon_mod_init(void) 148 { 149 return crypto_register_shashes(algs, ARRAY_SIZE(algs)); 150 } 151 152 static void __exit sha3_neon_mod_fini(void) 153 { 154 crypto_unregister_shashes(algs, ARRAY_SIZE(algs)); 155 } 156 157 module_cpu_feature_match(SHA3, sha3_neon_mod_init); 158 module_exit(sha3_neon_mod_fini); 159