1/*
2 * Copyright 2019-2021 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
15size_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
37size_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
59static 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
71static const PROV_GCM_HW armv8_aes_gcm = {
72    armv8_aes_gcm_initkey,
73    ossl_gcm_setiv,
74    ossl_gcm_aad_update,
75    generic_aes_gcm_cipher_update,
76    ossl_gcm_cipher_final,
77    ossl_gcm_one_shot
78};
79
80const PROV_GCM_HW *ossl_prov_aes_hw_gcm(size_t keybits)
81{
82    return AES_PMULL_CAPABLE ? &armv8_aes_gcm : &aes_gcm;
83}
84