// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package aes

import (
	"crypto/cipher"
	"crypto/internal/subtle"
)

// defined in asm_ppc64le.s

//go:noescape
func expandKeyAsm(nr int, key *byte, enc *uint32, dec *uint32)

//go:noescape
func encryptBlockAsm(nr int, xk *uint32, dst, src *byte)

//go:noescape
func decryptBlockAsm(nr int, xk *uint32, dst, src *byte)

type aesCipherAsm struct {
	aesCipher
}

func newCipher(key []byte) (cipher.Block, error) {
	n := len(key) + 28
	c := aesCipherAsm{aesCipher{make([]uint32, n), make([]uint32, n)}}
	k := len(key)

	var rounds int
	switch len(key) {
	case 128 / 8:
		rounds = 10
	case 192 / 8:
		rounds = 12
	case 256 / 8:
		rounds = 14
	default:
		return nil, KeySizeError(k)
	}

	expandKeyAsm(rounds, &key[0], &c.enc[0], &c.dec[0])
	return &c, nil
}

func (c *aesCipherAsm) BlockSize() int { return BlockSize }

func (c *aesCipherAsm) Encrypt(dst, src []byte) {
	if len(src) < BlockSize {
		panic("crypto/aes: input not full block")
	}
	if len(dst) < BlockSize {
		panic("crypto/aes: output not full block")
	}
	if subtle.InexactOverlap(dst[:BlockSize], src[:BlockSize]) {
		panic("crypto/aes: invalid buffer overlap")
	}
	encryptBlockAsm(len(c.enc)/4-1, &c.enc[0], &dst[0], &src[0])
}

func (c *aesCipherAsm) Decrypt(dst, src []byte) {
	if len(src) < BlockSize {
		panic("crypto/aes: input not full block")
	}
	if len(dst) < BlockSize {
		panic("crypto/aes: output not full block")
	}
	if subtle.InexactOverlap(dst[:BlockSize], src[:BlockSize]) {
		panic("crypto/aes: invalid buffer overlap")
	}
	decryptBlockAsm(len(c.dec)/4-1, &c.dec[0], &dst[0], &src[0])
}

// expandKey is used by BenchmarkExpand to ensure that the asm implementation
// of key expansion is used for the benchmark when it is available.
func expandKey(key []byte, enc, dec []uint32) {
	rounds := 10 // rounds needed for AES128
	switch len(key) {
	case 192 / 8:
		rounds = 12
	case 256 / 8:
		rounds = 14
	}
	expandKeyAsm(rounds, &key[0], &enc[0], &dec[0])
}