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Linux/arch/arm64/crypto/aes-ce-glue.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  * aes-ce-cipher.c - core AES cipher using ARMv8 Crypto Extensions
  4  *
  5  * Copyright (C) 2013 - 2017 Linaro Ltd <ard.biesheuvel@linaro.org>
  6  */
  7 
  8 #include <asm/neon.h>
  9 #include <asm/simd.h>
 10 #include <asm/unaligned.h>
 11 #include <crypto/aes.h>
 12 #include <crypto/internal/simd.h>
 13 #include <linux/cpufeature.h>
 14 #include <linux/crypto.h>
 15 #include <linux/module.h>
 16 
 17 #include "aes-ce-setkey.h"
 18 
 19 MODULE_DESCRIPTION("Synchronous AES cipher using ARMv8 Crypto Extensions");
 20 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
 21 MODULE_LICENSE("GPL v2");
 22 
 23 struct aes_block {
 24         u8 b[AES_BLOCK_SIZE];
 25 };
 26 
 27 asmlinkage void __aes_ce_encrypt(u32 *rk, u8 *out, const u8 *in, int rounds);
 28 asmlinkage void __aes_ce_decrypt(u32 *rk, u8 *out, const u8 *in, int rounds);
 29 
 30 asmlinkage u32 __aes_ce_sub(u32 l);
 31 asmlinkage void __aes_ce_invert(struct aes_block *out,
 32                                 const struct aes_block *in);
 33 
 34 static int num_rounds(struct crypto_aes_ctx *ctx)
 35 {
 36         /*
 37          * # of rounds specified by AES:
 38          * 128 bit key          10 rounds
 39          * 192 bit key          12 rounds
 40          * 256 bit key          14 rounds
 41          * => n byte key        => 6 + (n/4) rounds
 42          */
 43         return 6 + ctx->key_length / 4;
 44 }
 45 
 46 static void aes_cipher_encrypt(struct crypto_tfm *tfm, u8 dst[], u8 const src[])
 47 {
 48         struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);
 49 
 50         if (!crypto_simd_usable()) {
 51                 aes_encrypt(ctx, dst, src);
 52                 return;
 53         }
 54 
 55         kernel_neon_begin();
 56         __aes_ce_encrypt(ctx->key_enc, dst, src, num_rounds(ctx));
 57         kernel_neon_end();
 58 }
 59 
 60 static void aes_cipher_decrypt(struct crypto_tfm *tfm, u8 dst[], u8 const src[])
 61 {
 62         struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);
 63 
 64         if (!crypto_simd_usable()) {
 65                 aes_decrypt(ctx, dst, src);
 66                 return;
 67         }
 68 
 69         kernel_neon_begin();
 70         __aes_ce_decrypt(ctx->key_dec, dst, src, num_rounds(ctx));
 71         kernel_neon_end();
 72 }
 73 
 74 int ce_aes_expandkey(struct crypto_aes_ctx *ctx, const u8 *in_key,
 75                      unsigned int key_len)
 76 {
 77         /*
 78          * The AES key schedule round constants
 79          */
 80         static u8 const rcon[] = {
 81                 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36,
 82         };
 83 
 84         u32 kwords = key_len / sizeof(u32);
 85         struct aes_block *key_enc, *key_dec;
 86         int i, j;
 87 
 88         if (key_len != AES_KEYSIZE_128 &&
 89             key_len != AES_KEYSIZE_192 &&
 90             key_len != AES_KEYSIZE_256)
 91                 return -EINVAL;
 92 
 93         ctx->key_length = key_len;
 94         for (i = 0; i < kwords; i++)
 95                 ctx->key_enc[i] = get_unaligned_le32(in_key + i * sizeof(u32));
 96 
 97         kernel_neon_begin();
 98         for (i = 0; i < sizeof(rcon); i++) {
 99                 u32 *rki = ctx->key_enc + (i * kwords);
100                 u32 *rko = rki + kwords;
101 
102                 rko[0] = ror32(__aes_ce_sub(rki[kwords - 1]), 8) ^ rcon[i] ^ rki[0];
103                 rko[1] = rko[0] ^ rki[1];
104                 rko[2] = rko[1] ^ rki[2];
105                 rko[3] = rko[2] ^ rki[3];
106 
107                 if (key_len == AES_KEYSIZE_192) {
108                         if (i >= 7)
109                                 break;
110                         rko[4] = rko[3] ^ rki[4];
111                         rko[5] = rko[4] ^ rki[5];
112                 } else if (key_len == AES_KEYSIZE_256) {
113                         if (i >= 6)
114                                 break;
115                         rko[4] = __aes_ce_sub(rko[3]) ^ rki[4];
116                         rko[5] = rko[4] ^ rki[5];
117                         rko[6] = rko[5] ^ rki[6];
118                         rko[7] = rko[6] ^ rki[7];
119                 }
120         }
121 
122         /*
123          * Generate the decryption keys for the Equivalent Inverse Cipher.
124          * This involves reversing the order of the round keys, and applying
125          * the Inverse Mix Columns transformation on all but the first and
126          * the last one.
127          */
128         key_enc = (struct aes_block *)ctx->key_enc;
129         key_dec = (struct aes_block *)ctx->key_dec;
130         j = num_rounds(ctx);
131 
132         key_dec[0] = key_enc[j];
133         for (i = 1, j--; j > 0; i++, j--)
134                 __aes_ce_invert(key_dec + i, key_enc + j);
135         key_dec[i] = key_enc[0];
136 
137         kernel_neon_end();
138         return 0;
139 }
140 EXPORT_SYMBOL(ce_aes_expandkey);
141 
142 int ce_aes_setkey(struct crypto_tfm *tfm, const u8 *in_key,
143                   unsigned int key_len)
144 {
145         struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);
146 
147         return ce_aes_expandkey(ctx, in_key, key_len);
148 }
149 EXPORT_SYMBOL(ce_aes_setkey);
150 
151 static struct crypto_alg aes_alg = {
152         .cra_name               = "aes",
153         .cra_driver_name        = "aes-ce",
154         .cra_priority           = 250,
155         .cra_flags              = CRYPTO_ALG_TYPE_CIPHER,
156         .cra_blocksize          = AES_BLOCK_SIZE,
157         .cra_ctxsize            = sizeof(struct crypto_aes_ctx),
158         .cra_module             = THIS_MODULE,
159         .cra_cipher = {
160                 .cia_min_keysize        = AES_MIN_KEY_SIZE,
161                 .cia_max_keysize        = AES_MAX_KEY_SIZE,
162                 .cia_setkey             = ce_aes_setkey,
163                 .cia_encrypt            = aes_cipher_encrypt,
164                 .cia_decrypt            = aes_cipher_decrypt
165         }
166 };
167 
168 static int __init aes_mod_init(void)
169 {
170         return crypto_register_alg(&aes_alg);
171 }
172 
173 static void __exit aes_mod_exit(void)
174 {
175         crypto_unregister_alg(&aes_alg);
176 }
177 
178 module_cpu_feature_match(AES, aes_mod_init);
179 module_exit(aes_mod_exit);
180 

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