Xray-core/common/crypto/aes.go

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2020-11-25 11:01:53 +00:00
package crypto
import (
"crypto/aes"
"crypto/cipher"
"github.com/xtls/xray-core/v1/common"
)
// NewAesDecryptionStream creates a new AES encryption stream based on given key and IV.
// Caller must ensure the length of key and IV is either 16, 24 or 32 bytes.
func NewAesDecryptionStream(key []byte, iv []byte) cipher.Stream {
return NewAesStreamMethod(key, iv, cipher.NewCFBDecrypter)
}
// NewAesEncryptionStream creates a new AES description stream based on given key and IV.
// Caller must ensure the length of key and IV is either 16, 24 or 32 bytes.
func NewAesEncryptionStream(key []byte, iv []byte) cipher.Stream {
return NewAesStreamMethod(key, iv, cipher.NewCFBEncrypter)
}
func NewAesStreamMethod(key []byte, iv []byte, f func(cipher.Block, []byte) cipher.Stream) cipher.Stream {
aesBlock, err := aes.NewCipher(key)
common.Must(err)
return f(aesBlock, iv)
}
// NewAesCTRStream creates a stream cipher based on AES-CTR.
func NewAesCTRStream(key []byte, iv []byte) cipher.Stream {
return NewAesStreamMethod(key, iv, cipher.NewCTR)
}
// NewAesGcm creates a AEAD cipher based on AES-GCM.
func NewAesGcm(key []byte) cipher.AEAD {
block, err := aes.NewCipher(key)
common.Must(err)
aead, err := cipher.NewGCM(block)
common.Must(err)
return aead
}