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90 lines
2.0 KiB
Go
90 lines
2.0 KiB
Go
package util
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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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"io"
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"time"
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log "github.com/sirupsen/logrus"
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)
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func AESGCMEncrypt(nonce []byte, key []byte, plaintext []byte) ([]byte, error) {
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block, err := aes.NewCipher(key)
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if err != nil {
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return nil, err
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}
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aesgcm, err := cipher.NewGCM(block)
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if err != nil {
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return nil, err
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}
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return aesgcm.Seal(nil, nonce, plaintext, nil), nil
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}
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func AESGCMDecrypt(nonce []byte, key []byte, ciphertext []byte) ([]byte, error) {
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block, err := aes.NewCipher(key)
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if err != nil {
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return nil, err
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}
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aesgcm, err := cipher.NewGCM(block)
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if err != nil {
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return nil, err
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}
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plain, err := aesgcm.Open(nil, nonce, ciphertext, nil)
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if err != nil {
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return nil, err
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}
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return plain, nil
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}
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func CryptoRandRead(buf []byte) {
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RandRead(rand.Reader, buf)
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}
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func RandRead(randSource io.Reader, buf []byte) {
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_, err := randSource.Read(buf)
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if err == nil {
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return
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}
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waitDur := [10]time.Duration{5 * time.Millisecond, 10 * time.Millisecond, 30 * time.Millisecond, 50 * time.Millisecond,
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100 * time.Millisecond, 300 * time.Millisecond, 500 * time.Millisecond, 1 * time.Second,
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3 * time.Second, 5 * time.Second}
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for i := 0; i < 10; i++ {
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log.Errorf("Failed to get cryptographic random bytes: %v. Retrying...", err)
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_, err = rand.Read(buf)
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if err == nil {
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return
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}
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time.Sleep(time.Millisecond * waitDur[i])
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}
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log.Fatal("Cannot get cryptographic random bytes after 10 retries")
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}
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/*
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func Pipe(dst net.Conn, src net.Conn, srcReadTimeout time.Duration) {
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// The maximum size of TLS message will be 16380+14+16. 14 because of the stream header and 16
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// because of the salt/mac
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// 16408 is the max TLS message size on Firefox
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buf := make([]byte, 16378)
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for {
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if srcReadTimeout != 0 {
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src.SetReadDeadline(time.Now().Add(srcReadTimeout))
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}
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i, err := io.ReadAtLeast(src, buf, 1)
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if err != nil {
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dst.Close()
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src.Close()
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return
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}
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_, err = dst.Write(buf[:i])
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if err != nil {
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dst.Close()
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src.Close()
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return
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}
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}
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}
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*/
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