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85 lines
1.7 KiB
85 lines
1.7 KiB
package shadowsocks
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import (
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"crypto/cipher"
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"crypto/md5"
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"github.com/v2ray/v2ray-core/common/crypto"
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"github.com/v2ray/v2ray-core/common/protocol"
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)
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type Cipher interface {
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KeySize() int
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IVSize() int
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NewEncodingStream(key []byte, iv []byte) (cipher.Stream, error)
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NewDecodingStream(key []byte, iv []byte) (cipher.Stream, error)
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}
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type AesCfb struct {
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KeyBytes int
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}
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func (this *AesCfb) KeySize() int {
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return this.KeyBytes
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}
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func (this *AesCfb) IVSize() int {
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return 16
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}
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func (this *AesCfb) NewEncodingStream(key []byte, iv []byte) (cipher.Stream, error) {
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stream := crypto.NewAesEncryptionStream(key, iv)
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return stream, nil
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}
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func (this *AesCfb) NewDecodingStream(key []byte, iv []byte) (cipher.Stream, error) {
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stream := crypto.NewAesDecryptionStream(key, iv)
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return stream, nil
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}
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type ChaCha20 struct {
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IVBytes int
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}
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func (this *ChaCha20) KeySize() int {
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return 32
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}
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func (this *ChaCha20) IVSize() int {
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return this.IVBytes
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}
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func (this *ChaCha20) NewEncodingStream(key []byte, iv []byte) (cipher.Stream, error) {
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return crypto.NewChaCha20Stream(key, iv), nil
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}
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func (this *ChaCha20) NewDecodingStream(key []byte, iv []byte) (cipher.Stream, error) {
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return crypto.NewChaCha20Stream(key, iv), nil
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}
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type Config struct {
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Cipher Cipher
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Key []byte
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UDP bool
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Level protocol.UserLevel
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Email string
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}
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func PasswordToCipherKey(password string, keySize int) []byte {
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pwdBytes := []byte(password)
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key := make([]byte, 0, keySize)
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md5Sum := md5.Sum(pwdBytes)
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key = append(key, md5Sum[:]...)
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for len(key) < keySize {
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md5Hash := md5.New()
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md5Hash.Write(md5Sum[:])
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md5Hash.Write(pwdBytes)
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md5Hash.Sum(md5Sum[:0])
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key = append(key, md5Sum[:]...)
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}
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return key
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}
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