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/*
* Copyright 2019-2020 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
/*
* Crypto extention support for AES GCM.
* This file is included by cipher_aes_gcm_hw.c
*/
size_t armv8_aes_gcm_encrypt(const unsigned char *in, unsigned char *out, size_t len,
const void *key, unsigned char ivec[16], u64 *Xi)
{
size_t align_bytes = 0;
align_bytes = len - len % 16;
AES_KEY *aes_key = (AES_KEY *)key;
switch(aes_key->rounds) {
case 10:
aes_gcm_enc_128_kernel(in, align_bytes * 8, out, (uint64_t *)Xi, ivec, key);
break;
case 12:
aes_gcm_enc_192_kernel(in, align_bytes * 8, out, (uint64_t *)Xi, ivec, key);
break;
case 14:
aes_gcm_enc_256_kernel(in, align_bytes * 8, out, (uint64_t *)Xi, ivec, key);
break;
}
return align_bytes;
}
size_t armv8_aes_gcm_decrypt(const unsigned char *in, unsigned char *out, size_t len,
const void *key, unsigned char ivec[16], u64 *Xi)
{
size_t align_bytes = 0;
align_bytes = len - len % 16;
AES_KEY *aes_key = (AES_KEY *)key;
switch(aes_key->rounds) {
case 10:
aes_gcm_dec_128_kernel(in, align_bytes * 8, out, (uint64_t *)Xi, ivec, key);
break;
case 12:
aes_gcm_dec_192_kernel(in, align_bytes * 8, out, (uint64_t *)Xi, ivec, key);
break;
case 14:
aes_gcm_dec_256_kernel(in, align_bytes * 8, out, (uint64_t *)Xi, ivec, key);
break;
}
return align_bytes;
}
static int armv8_aes_gcm_initkey(PROV_GCM_CTX *ctx, const unsigned char *key,
size_t keylen)
{
PROV_AES_GCM_CTX *actx = (PROV_AES_GCM_CTX *)ctx;
AES_KEY *ks = &actx->ks.ks;
GCM_HW_SET_KEY_CTR_FN(ks, aes_v8_set_encrypt_key, aes_v8_encrypt,
aes_v8_ctr32_encrypt_blocks);
return 1;
}
static const PROV_GCM_HW armv8_aes_gcm = {
armv8_aes_gcm_initkey,
gcm_setiv,
gcm_aad_update,
generic_aes_gcm_cipher_update,
gcm_cipher_final,
gcm_one_shot
};
const PROV_GCM_HW *ossl_prov_aes_hw_gcm(size_t keybits)
{
return AES_PMULL_CAPABLE ? &armv8_aes_gcm : &aes_gcm;
}
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