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1 | /* |
2 | * Copyright 2019 The OpenSSL Project Authors. All Rights Reserved. | |
3 | * | |
4 | * Licensed under the Apache License 2.0 (the "License"). You may not use | |
5 | * this file except in compliance with the License. You can obtain a copy | |
6 | * in the file LICENSE in the source distribution or at | |
7 | * https://www.openssl.org/source/license.html | |
8 | */ | |
9 | ||
10 | /* | |
11 | * Crypto extention support for AES GCM. | |
12 | * This file is included by cipher_aes_gcm_hw.c | |
13 | */ | |
14 | ||
15 | size_t armv8_aes_gcm_encrypt(const unsigned char *in, unsigned char *out, size_t len, | |
16 | const void *key, unsigned char ivec[16], u64 *Xi) | |
17 | { | |
18 | size_t align_bytes = 0; | |
19 | align_bytes = len - len % 16; | |
20 | ||
21 | AES_KEY *aes_key = (AES_KEY *)key; | |
22 | ||
23 | switch(aes_key->rounds) { | |
24 | case 10: | |
25 | aes_gcm_enc_128_kernel(in, align_bytes * 8, out, (uint64_t *)Xi, ivec, key); | |
26 | break; | |
27 | case 12: | |
28 | aes_gcm_enc_192_kernel(in, align_bytes * 8, out, (uint64_t *)Xi, ivec, key); | |
29 | break; | |
30 | case 14: | |
31 | aes_gcm_enc_256_kernel(in, align_bytes * 8, out, (uint64_t *)Xi, ivec, key); | |
32 | break; | |
33 | } | |
34 | return align_bytes; | |
35 | } | |
36 | ||
37 | size_t armv8_aes_gcm_decrypt(const unsigned char *in, unsigned char *out, size_t len, | |
38 | const void *key, unsigned char ivec[16], u64 *Xi) | |
39 | { | |
40 | size_t align_bytes = 0; | |
41 | align_bytes = len - len % 16; | |
42 | ||
43 | AES_KEY *aes_key = (AES_KEY *)key; | |
44 | ||
45 | switch(aes_key->rounds) { | |
46 | case 10: | |
47 | aes_gcm_dec_128_kernel(in, align_bytes * 8, out, (uint64_t *)Xi, ivec, key); | |
48 | break; | |
49 | case 12: | |
50 | aes_gcm_dec_192_kernel(in, align_bytes * 8, out, (uint64_t *)Xi, ivec, key); | |
51 | break; | |
52 | case 14: | |
53 | aes_gcm_dec_256_kernel(in, align_bytes * 8, out, (uint64_t *)Xi, ivec, key); | |
54 | break; | |
55 | } | |
56 | return align_bytes; | |
57 | } | |
58 | ||
59 | static int armv8_aes_gcm_initkey(PROV_GCM_CTX *ctx, const unsigned char *key, | |
60 | size_t keylen) | |
61 | { | |
62 | PROV_AES_GCM_CTX *actx = (PROV_AES_GCM_CTX *)ctx; | |
63 | AES_KEY *ks = &actx->ks.ks; | |
64 | ||
65 | GCM_HW_SET_KEY_CTR_FN(ks, aes_v8_set_encrypt_key, aes_v8_encrypt, | |
66 | aes_v8_ctr32_encrypt_blocks); | |
67 | return 1; | |
68 | } | |
69 | ||
70 | ||
71 | static const PROV_GCM_HW armv8_aes_gcm = { | |
72 | armv8_aes_gcm_initkey, | |
73 | gcm_setiv, | |
74 | gcm_aad_update, | |
75 | gcm_cipher_update, | |
76 | gcm_cipher_final, | |
77 | gcm_one_shot | |
78 | }; | |
79 | ||
80 | const PROV_GCM_HW *PROV_AES_HW_gcm(size_t keybits) | |
81 | { | |
82 | return AES_PMULL_CAPABLE ? &armv8_aes_gcm : &aes_gcm; | |
83 | } |