providers/implementations/ciphers/cipher_aes_gcm_hw_armv8.inc

   1 /*
   2  * Copyright 2019-2020 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     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
  80 const PROV_GCM_HW *ossl_prov_aes_hw_gcm(size_t keybits)
  81 {
  82     return AES_PMULL_CAPABLE ? &armv8_aes_gcm : &aes_gcm;
  83 }