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Padding size was incorrect -- didn't pad to multiples of 256

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Gilbert Chen
2018-11-03 11:42:03 -04:00
parent 244b797a1c
commit 21b3d9e57f
2 changed files with 9 additions and 4 deletions
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5
src/duplicacy_chunk.go
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@@ -250,10 +250,7 @@ func (chunk *Chunk) Encrypt(encryptionKey []byte, derivationKey string) (err err
// PKCS7 is used. Compressed chunk sizes leaks information about the original chunks so we want the padding sizes
// to be the maximum allowed by PKCS7
dataLength := encryptedBuffer.Len() - offset
paddingLength := dataLength % 256
if paddingLength == 0 {
paddingLength = 256
}
paddingLength := 256 - dataLength % 256
encryptedBuffer.Write(bytes.Repeat([]byte{byte(paddingLength)}, paddingLength))
encryptedBuffer.Write(bytes.Repeat([]byte{0}, gcm.Overhead()))