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add some extra padding to decoy super small messages.

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fiatjaf 2022-12-14 16:17:37 -03:00
parent 8a8fd7c2b0
commit ad71e083d8
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GPG Key ID: BAD43C4BE5C1A3A1
1 changed files with 15 additions and 2 deletions
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17
nip04/nip04.go
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@ -8,6 +8,7 @@ import (
"encoding/base64"
"encoding/hex"
"fmt"
mrand "math/rand"
"strings"
"github.com/btcsuite/btcd/btcec/v2"
@ -54,8 +55,20 @@ func Encrypt(message string, key []byte) (string, error) {
plaintext := []byte(message)
// add padding
padding := block.BlockSize() - len(plaintext)%block.BlockSize() // will be a number between 1 and 16 (inc), never 0
padtext := bytes.Repeat([]byte{byte(padding)}, padding) // encode the padding in all the padding bytes
base := len(plaintext)
extra := 0
var padding int
if base < 100 {
// add some random padding to this message since it is too small
extra = mrand.Intn(230) // the total padding will be padding + extra, which can't be more than 256
}
// this will be a number between 1 and 16 (including), never 0
padding = block.BlockSize() - (base+extra)%block.BlockSize()
// encode the padding in all the padding bytes themselves
padtext := bytes.Repeat([]byte{byte(padding + extra)}, padding+extra)
paddedMsgBytes := append(plaintext, padtext...)
ciphertext := make([]byte, len(paddedMsgBytes))