71 lines
1.4 KiB
Go
71 lines
1.4 KiB
Go
package crypto
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import (
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"crypto/aes"
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"crypto/cipher"
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"crypto/rand"
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"encoding/base64"
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"io"
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"git.tcp.direct/tcp.direct/IR5EC/connection"
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)
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func GenerateRandomKey(c *connection.Session) {
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c.EncryptionKey()
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}
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func (c *connection) encryptionKeyBase64() string {
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return base64.StdEncoding.EncodeToString(c.encryptionKey)
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}
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func (c *connection) aesEncryptString(str string) string {
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in := []byte(str)
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block, err := aes.NewCipher(c.encryptionKey)
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if err != nil {
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panic(err)
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}
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ciphertext := make([]byte, aes.BlockSize+len(in))
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iv := ciphertext[:aes.BlockSize]
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if _, err := io.ReadFull(rand.Reader, iv); err != nil {
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panic(err)
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}
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stream := cipher.NewCFBEncrypter(block, iv)
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stream.XORKeyStream(ciphertext[aes.BlockSize:], in)
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msg := base64.StdEncoding.EncodeToString(ciphertext)
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return msg
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}
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func (p *peer) aesDecryptString(str string) string {
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ciphertext, err := base64.StdEncoding.DecodeString(str)
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if err != nil {
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return str
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}
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block, err := aes.NewCipher(p.decryptionKey)
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if err != nil {
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return str
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}
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if len(ciphertext) < aes.BlockSize {
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return str
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}
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iv := ciphertext[:aes.BlockSize]
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ciphertext = ciphertext[aes.BlockSize:]
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stream := cipher.NewCFBDecrypter(block, iv)
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stream.XORKeyStream(ciphertext, ciphertext)
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return string(ciphertext)
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}
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func (p *peer) sendEncryptionKey() {
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p.sendControlCommandRSA("SETKEY", p.conn.encryptionKeyBase64())
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}
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