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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* AES accelerated using the sparc64 aes opcodes
*
* Copyright (C) 2008, Intel Corp.
* Copyright (c) 2010, Intel Corporation.
* Copyright 2026 Google LLC
*/
#include <asm/fpumacro.h>
#include <asm/opcodes.h>
#include <asm/pstate.h>
#include <asm/elf.h>
static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_aes_opcodes);
EXPORT_SYMBOL_GPL(aes_sparc64_key_expand);
EXPORT_SYMBOL_GPL(aes_sparc64_load_encrypt_keys_128);
EXPORT_SYMBOL_GPL(aes_sparc64_load_encrypt_keys_192);
EXPORT_SYMBOL_GPL(aes_sparc64_load_encrypt_keys_256);
EXPORT_SYMBOL_GPL(aes_sparc64_load_decrypt_keys_128);
EXPORT_SYMBOL_GPL(aes_sparc64_load_decrypt_keys_192);
EXPORT_SYMBOL_GPL(aes_sparc64_load_decrypt_keys_256);
EXPORT_SYMBOL_GPL(aes_sparc64_ecb_encrypt_128);
EXPORT_SYMBOL_GPL(aes_sparc64_ecb_encrypt_192);
EXPORT_SYMBOL_GPL(aes_sparc64_ecb_encrypt_256);
EXPORT_SYMBOL_GPL(aes_sparc64_ecb_decrypt_128);
EXPORT_SYMBOL_GPL(aes_sparc64_ecb_decrypt_192);
EXPORT_SYMBOL_GPL(aes_sparc64_ecb_decrypt_256);
EXPORT_SYMBOL_GPL(aes_sparc64_cbc_encrypt_128);
EXPORT_SYMBOL_GPL(aes_sparc64_cbc_encrypt_192);
EXPORT_SYMBOL_GPL(aes_sparc64_cbc_encrypt_256);
EXPORT_SYMBOL_GPL(aes_sparc64_cbc_decrypt_128);
EXPORT_SYMBOL_GPL(aes_sparc64_cbc_decrypt_192);
EXPORT_SYMBOL_GPL(aes_sparc64_cbc_decrypt_256);
EXPORT_SYMBOL_GPL(aes_sparc64_ctr_crypt_128);
EXPORT_SYMBOL_GPL(aes_sparc64_ctr_crypt_192);
EXPORT_SYMBOL_GPL(aes_sparc64_ctr_crypt_256);
void aes_sparc64_encrypt_128(const u64 *key, const u32 *input, u32 *output);
void aes_sparc64_encrypt_192(const u64 *key, const u32 *input, u32 *output);
void aes_sparc64_encrypt_256(const u64 *key, const u32 *input, u32 *output);
void aes_sparc64_decrypt_128(const u64 *key, const u32 *input, u32 *output);
void aes_sparc64_decrypt_192(const u64 *key, const u32 *input, u32 *output);
void aes_sparc64_decrypt_256(const u64 *key, const u32 *input, u32 *output);
static void aes_preparekey_arch(union aes_enckey_arch *k,
union aes_invkey_arch *inv_k,
const u8 *in_key, int key_len, int nrounds)
{
if (static_branch_likely(&have_aes_opcodes)) {
u32 aligned_key[AES_MAX_KEY_SIZE / 4];
if (IS_ALIGNED((uintptr_t)in_key, 4)) {
aes_sparc64_key_expand((const u32 *)in_key,
k->sparc_rndkeys, key_len);
} else {
memcpy(aligned_key, in_key, key_len);
aes_sparc64_key_expand(aligned_key,
k->sparc_rndkeys, key_len);
memzero_explicit(aligned_key, key_len);
}
/*
* Note that nothing needs to be written to inv_k (if it's
* non-NULL) here, since the SPARC64 assembly code uses
* k->sparc_rndkeys for both encryption and decryption.
*/
} else {
aes_expandkey_generic(k->rndkeys,
inv_k ? inv_k->inv_rndkeys : NULL,
in_key, key_len);
}
}
static void aes_sparc64_encrypt(const struct aes_enckey *key,
const u32 *input, u32 *output)
{
if (key->len == AES_KEYSIZE_128)
aes_sparc64_encrypt_128(key->k.sparc_rndkeys, input, output);
else if (key->len == AES_KEYSIZE_192)
aes_sparc64_encrypt_192(key->k.sparc_rndkeys, input, output);
else
aes_sparc64_encrypt_256(key->k.sparc_rndkeys, input, output);
}
static void aes_encrypt_arch(const struct aes_enckey *key,
u8 out[AES_BLOCK_SIZE],
const u8 in[AES_BLOCK_SIZE])
{
u32 bounce_buf[AES_BLOCK_SIZE / 4];
if (static_branch_likely(&have_aes_opcodes)) {
if (IS_ALIGNED((uintptr_t)in | (uintptr_t)out, 4)) {
aes_sparc64_encrypt(key, (const u32 *)in, (u32 *)out);
} else {
memcpy(bounce_buf, in, AES_BLOCK_SIZE);
aes_sparc64_encrypt(key, bounce_buf, bounce_buf);
memcpy(out, bounce_buf, AES_BLOCK_SIZE);
}
} else {
aes_encrypt_generic(key->k.rndkeys, key->nrounds, out, in);
}
}
static void aes_sparc64_decrypt(const struct aes_key *key,
const u32 *input, u32 *output)
{
if (key->len == AES_KEYSIZE_128)
aes_sparc64_decrypt_128(key->k.sparc_rndkeys, input, output);
else if (key->len == AES_KEYSIZE_192)
aes_sparc64_decrypt_192(key->k.sparc_rndkeys, input, output);
else
aes_sparc64_decrypt_256(key->k.sparc_rndkeys, input, output);
}
static void aes_decrypt_arch(const struct aes_key *key,
u8 out[AES_BLOCK_SIZE],
const u8 in[AES_BLOCK_SIZE])
{
u32 bounce_buf[AES_BLOCK_SIZE / 4];
if (static_branch_likely(&have_aes_opcodes)) {
if (IS_ALIGNED((uintptr_t)in | (uintptr_t)out, 4)) {
aes_sparc64_decrypt(key, (const u32 *)in, (u32 *)out);
} else {
memcpy(bounce_buf, in, AES_BLOCK_SIZE);
aes_sparc64_decrypt(key, bounce_buf, bounce_buf);
memcpy(out, bounce_buf, AES_BLOCK_SIZE);
}
} else {
aes_decrypt_generic(key->inv_k.inv_rndkeys, key->nrounds,
out, in);
}
}
#if IS_ENABLED(CONFIG_CRYPTO_LIB_AES_XTS)
void aes_sparc64_xts_encrypt_128(const u64 *key, const u64 *input, u64 *output,
size_t len, u64 tweak[2]);
void aes_sparc64_xts_encrypt_256(const u64 *key, const u64 *input, u64 *output,
size_t len, u64 tweak[2]);
void aes_sparc64_xts_decrypt_128(const u64 *key_end, const u64 *input,
u64 *output, size_t len, u64 tweak[2]);
void aes_sparc64_xts_decrypt_256(const u64 *key_end, const u64 *input,
u64 *output, size_t len, u64 tweak[2]);
/* len is always a positive multiple of AES_BLOCK_SIZE here. */
static __always_inline bool
aes_xts_crypt_sparc64(u8 *dst, const u8 *src, size_t len,
u8 tweak[AES_BLOCK_SIZE],
const struct aes_xts_key *key, bool cont, bool enc)
{
const struct aes_key *k = &key->main_key;
const u64 *rk = k->k.sparc_rndkeys;
const u64 *rk_end = rk + 2 * (k->nrounds + 1);
const u64 *in = (const u64 *)src;
u64 *out = (u64 *)dst;
u64 t[2];
/* The assembly code has no AES-192 and needs 8-byte aligned data. */
if (!static_branch_likely(&have_aes_opcodes) ||
k->len == AES_KEYSIZE_192 ||
!IS_ALIGNED((uintptr_t)dst | (uintptr_t)src, 8))
return false;
if (cont)
memcpy(t, tweak, sizeof(t));
else
aes_encrypt_arch(&key->tweak_key, (u8 *)t, tweak);
if (k->len == AES_KEYSIZE_128) {
if (enc) {
aes_sparc64_load_encrypt_keys_128(rk);
aes_sparc64_xts_encrypt_128(rk, in, out, len, t);
} else {
aes_sparc64_load_decrypt_keys_128(rk);
aes_sparc64_xts_decrypt_128(rk_end, in, out, len, t);
}
} else {
if (enc) {
aes_sparc64_load_encrypt_keys_256(rk);
aes_sparc64_xts_encrypt_256(rk, in, out, len, t);
} else {
aes_sparc64_load_decrypt_keys_256(rk);
aes_sparc64_xts_decrypt_256(rk_end, in, out, len, t);
}
}
fprs_write(0);
memcpy(tweak, t, sizeof(t));
memzero_explicit(t, sizeof(t));
return true;
}
#define aes_xts_encrypt_arch aes_xts_encrypt_arch
static bool aes_xts_encrypt_arch(u8 *dst, const u8 *src, size_t len,
u8 tweak[AES_BLOCK_SIZE],
const struct aes_xts_key *key, bool cont)
{
return aes_xts_crypt_sparc64(dst, src, len, tweak, key, cont, true);
}
#define aes_xts_decrypt_arch aes_xts_decrypt_arch
static bool aes_xts_decrypt_arch(u8 *dst, const u8 *src, size_t len,
u8 tweak[AES_BLOCK_SIZE],
const struct aes_xts_key *key, bool cont)
{
return aes_xts_crypt_sparc64(dst, src, len, tweak, key, cont, false);
}
#endif /* CONFIG_CRYPTO_LIB_AES_XTS */
#define aes_mod_init_arch aes_mod_init_arch
static void aes_mod_init_arch(void)
{
unsigned long cfr;
if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
return;
__asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
if (!(cfr & CFR_AES))
return;
static_branch_enable(&have_aes_opcodes);
}
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