mtg/mtglib/internal/obfuscated2/utils.go

package obfuscated2

import (
	"crypto/aes"
	"crypto/cipher"
)

func makeAesCtr(key, iv []byte) cipher.Stream {
	block, err := aes.NewCipher(key)
	if err != nil {
		panic(err)
	}

	return cipher.NewCTR(block, iv)
}

func invertByteSlices(dst, src []byte) {
	lenDst := len(dst) - 1

	for i, v := range src {
		dst[lenDst-i] = v
	}
}