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fix: Replace "math/rand" with "crypto/rand" in padding generation(#2032) (#1337) 

Co-authored-by: NaLan ZeYu <nalanzeyu@gmail.com>
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degfw 2022-11-14 14:24:24 +00:00 committed by GitHub
parent aa846b8420
commit d3efd2d24f
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1 changed files with 3 additions and 2 deletions
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5
common/crypto/auth.go
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@ -2,8 +2,8 @@ package crypto
import ( import (
"crypto/cipher" "crypto/cipher"
"crypto/rand"
"io" "io"
"math/rand"
"github.com/xtls/xray-core/common" "github.com/xtls/xray-core/common"
"github.com/xtls/xray-core/common/buf" "github.com/xtls/xray-core/common/buf"
@ -265,7 +265,8 @@ func (w *AuthenticationWriter) seal(b []byte) (*buf.Buffer, error) {
return nil, err return nil, err
} }
if paddingSize > 0 { if paddingSize > 0 {
// With size of the chunk and padding length encrypted, the content of padding doesn't matter much. // These paddings will send in clear text.
// To avoid leakage of PRNG internal state, a cryptographically secure PRNG should be used.
paddingBytes := eb.Extend(paddingSize) paddingBytes := eb.Extend(paddingSize)
common.Must2(rand.Read(paddingBytes)) common.Must2(rand.Read(paddingBytes))
} }