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98 lines
2.0 KiB
Go
98 lines
2.0 KiB
Go
package common
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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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"errors"
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"io"
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"math/big"
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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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if len(nonce) != aesgcm.NonceSize() {
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// check here so it doesn't panic
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return nil, errors.New("incorrect nonce size")
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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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if len(nonce) != aesgcm.NonceSize() {
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// check here so it doesn't panic
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return nil, errors.New("incorrect nonce size")
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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 backoff(f func() error) {
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err := f()
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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 random: %v. Retrying...", err)
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err = f()
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if err == nil {
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return
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}
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time.Sleep(waitDur[i])
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}
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log.Fatal("Cannot get random after 10 retries")
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}
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func RandRead(randSource io.Reader, buf []byte) {
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backoff(func() error {
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_, err := randSource.Read(buf)
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return err
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})
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}
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func RandItem[T any](list []T) T {
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return list[RandInt(len(list))]
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}
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func RandInt(n int) int {
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s := new(int)
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backoff(func() error {
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size, err := rand.Int(rand.Reader, big.NewInt(int64(n)))
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if err != nil {
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return err
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}
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*s = int(size.Int64())
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return nil
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})
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return *s
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}
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