mirror of
https://github.com/grafana/grafana.git
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67 lines
1.5 KiB
Go
67 lines
1.5 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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"github.com/grafana/grafana/pkg/log"
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)
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func Decrypt(payload []byte, secret string) []byte {
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key := encryptionKeyToBytes(secret)
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block, err := aes.NewCipher(key)
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if err != nil {
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log.Fatal(4, err.Error())
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}
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// The IV needs to be unique, but not secure. Therefore it's common to
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// include it at the beginning of the ciphertext.
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if len(payload) < aes.BlockSize {
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log.Fatal(4, "payload too short")
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}
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iv := payload[:aes.BlockSize]
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payload = payload[aes.BlockSize:]
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stream := cipher.NewCFBDecrypter(block, iv)
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// XORKeyStream can work in-place if the two arguments are the same.
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stream.XORKeyStream(payload, payload)
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return payload
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}
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func Encrypt(payload []byte, secret string) []byte {
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key := encryptionKeyToBytes(secret)
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block, err := aes.NewCipher(key)
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if err != nil {
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log.Fatal(4, err.Error())
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}
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// The IV needs to be unique, but not secure. Therefore it's common to
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// include it at the beginning of the ciphertext.
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ciphertext := make([]byte, aes.BlockSize+len(payload))
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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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log.Fatal(4, err.Error())
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}
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stream := cipher.NewCFBEncrypter(block, iv)
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stream.XORKeyStream(ciphertext[aes.BlockSize:], payload)
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return ciphertext
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}
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// Key needs to be 32bytes
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func encryptionKeyToBytes(secret string) []byte {
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key := make([]byte, 32, 32)
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keyBytes := []byte(secret)
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secretLength := len(keyBytes)
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for i := 0; i < 32; i++ {
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key[i] = keyBytes[i%secretLength]
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}
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return key
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}
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