providers/implementations/ciphers/cipher_aes_gcm_hw_armv8.inc

   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 extension 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             if (IS_CPU_SUPPORT_UNROLL8_EOR3()) {
  26                 unroll8_eor3_aes_gcm_enc_128_kernel(in, align_bytes * 8, out, (uint64_t *)Xi, ivec, key);
  27             } else {
  28                 aes_gcm_enc_128_kernel(in, align_bytes * 8, out, (uint64_t *)Xi, ivec, key);
  29             }
  30             break;
  31         case 12:
  32             if (IS_CPU_SUPPORT_UNROLL8_EOR3()) {
  33                 unroll8_eor3_aes_gcm_enc_192_kernel(in, align_bytes * 8, out, (uint64_t *)Xi, ivec, key);
  34             } else {
  35                 aes_gcm_enc_192_kernel(in, align_bytes * 8, out, (uint64_t *)Xi, ivec, key);
  36             }
  37             break;
  38         case 14:
  39             if (IS_CPU_SUPPORT_UNROLL8_EOR3()) {
  40                 unroll8_eor3_aes_gcm_enc_256_kernel(in, align_bytes * 8, out, (uint64_t *)Xi, ivec, key);
  41             } else {
  42                 aes_gcm_enc_256_kernel(in, align_bytes * 8, out, (uint64_t *)Xi, ivec, key);
  43             }
  44             break;
  45     }
  46     return align_bytes;
  47 }
  48
  49 size_t armv8_aes_gcm_decrypt(const unsigned char *in, unsigned char *out, size_t len,
  50                              const void *key, unsigned char ivec[16], u64 *Xi)
  51 {
  52     size_t align_bytes = 0;
  53     align_bytes = len - len % 16;
  54
  55     AES_KEY *aes_key = (AES_KEY *)key;
  56
  57     switch(aes_key->rounds) {
  58         case 10:
  59             if (IS_CPU_SUPPORT_UNROLL8_EOR3()) {
  60                 unroll8_eor3_aes_gcm_dec_128_kernel(in, align_bytes * 8, out, (uint64_t *)Xi, ivec, key);
  61             } else {
  62                 aes_gcm_dec_128_kernel(in, align_bytes * 8, out, (uint64_t *)Xi, ivec, key);
  63             }
  64             break;
  65         case 12:
  66             if (IS_CPU_SUPPORT_UNROLL8_EOR3()) {
  67                 unroll8_eor3_aes_gcm_dec_192_kernel(in, align_bytes * 8, out, (uint64_t *)Xi, ivec, key);
  68             } else {
  69                 aes_gcm_dec_192_kernel(in, align_bytes * 8, out, (uint64_t *)Xi, ivec, key);
  70             }
  71             break;
  72         case 14:
  73             if (IS_CPU_SUPPORT_UNROLL8_EOR3()) {
  74                 unroll8_eor3_aes_gcm_dec_256_kernel(in, align_bytes * 8, out, (uint64_t *)Xi, ivec, key);
  75             } else {
  76                 aes_gcm_dec_256_kernel(in, align_bytes * 8, out, (uint64_t *)Xi, ivec, key);
  77             }
  78             break;
  79     }
  80     return align_bytes;
  81 }
  82
  83 static int armv8_aes_gcm_initkey(PROV_GCM_CTX *ctx, const unsigned char *key,
  84                                  size_t keylen)
  85 {
  86     PROV_AES_GCM_CTX *actx = (PROV_AES_GCM_CTX *)ctx;
  87     AES_KEY *ks = &actx->ks.ks;
  88
  89     GCM_HW_SET_KEY_CTR_FN(ks, aes_v8_set_encrypt_key, aes_v8_encrypt,
  90                           aes_v8_ctr32_encrypt_blocks);
  91     return 1;
  92 }
  93
  94
  95 static const PROV_GCM_HW armv8_aes_gcm = {
  96     armv8_aes_gcm_initkey,
  97     ossl_gcm_setiv,
  98     ossl_gcm_aad_update,
  99     generic_aes_gcm_cipher_update,
 100     ossl_gcm_cipher_final,
 101     ossl_gcm_one_shot
 102 };
 103
 104 const PROV_GCM_HW *ossl_prov_aes_hw_gcm(size_t keybits)
 105 {
 106     return AES_PMULL_CAPABLE ? &armv8_aes_gcm : &aes_gcm;
 107 }