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Base64url decoding support nopadding #6

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Base64url decoding support nopadding #6

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ce36c58
testing base64url unpadded decode
steve-embling Apr 13, 2026
94936ab
fix
steve-embling Apr 13, 2026
3255fc2
fix
steve-embling Apr 13, 2026
f842d58
more fixes, sigh
steve-embling Apr 13, 2026
86eeb22
Padding check decision
steve-embling Apr 22, 2026
ecb0815
fix
steve-embling Apr 22, 2026
751bd73
another fix
steve-embling Apr 22, 2026
256db08
another
steve-embling Apr 22, 2026
8a54fbe
again
steve-embling Apr 22, 2026
008c444
again
steve-embling Apr 22, 2026
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20 changes: 15 additions & 5 deletions C2_Profiles/httpx/httpx/c2_code/webserver/transforms.go
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Original file line number Diff line number Diff line change
Expand Up @@ -22,13 +22,23 @@ func transformBase64URL(prev []byte, value string) ([]byte, error) {
return []byte(base64.URLEncoding.EncodeToString(prev)), nil
}
func transformBase64URLReverse(prev []byte, value string) ([]byte, error) {
decodedLength := base64.URLEncoding.DecodedLen(len(prev))
decoded := make([]byte, decodedLength)
actualDecoded, err := base64.URLEncoding.Decode(decoded, prev)
if err != nil {
if len(prev) > 0 && prev[len(prev)-1] == '=' {
decodedLength := base64.URLEncoding.DecodedLen(len(prev))
decoded := make([]byte, decodedLength)
actualDecoded, err := base64.URLEncoding.Decode(decoded, prev)
if err == nil {
return decoded[:actualDecoded], nil
}
return nil, err
} else {
decodedLength := base64.RawURLEncoding.DecodedLen(len(prev))
decoded := make([]byte, decodedLength)
actualDecoded, err := base64.RawURLEncoding.Decode(decoded, prev)
if err == nil {
return decoded[:actualDecoded], nil
}
return nil, err
}
return decoded[:actualDecoded], nil
}

func transformPrepend(prev []byte, value string) ([]byte, error) {
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21 changes: 16 additions & 5 deletions C2_Profiles/httpx/httpx/c2functions/transforms.go
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Original file line number Diff line number Diff line change
Expand Up @@ -24,15 +24,26 @@ func transformBase64URL(prev []byte, value string) ([]byte, error) {
return []byte(base64.URLEncoding.EncodeToString(prev)), nil
}
func transformBase64URLReverse(prev []byte, value string) ([]byte, error) {
decodedLength := base64.URLEncoding.DecodedLen(len(prev))
decoded := make([]byte, decodedLength)
actualDecoded, err := base64.URLEncoding.Decode(decoded, prev)
if err != nil {
if len(prev) > 0 && prev[len(prev)-1] == '=' {
decodedLength := base64.URLEncoding.DecodedLen(len(prev))
decoded := make([]byte, decodedLength)
actualDecoded, err := base64.URLEncoding.Decode(decoded, prev)
if err == nil {
return decoded[:actualDecoded], nil
}
return nil, err
} else {
decodedLength := base64.RawURLEncoding.DecodedLen(len(prev))
decoded := make([]byte, decodedLength)
actualDecoded, err := base64.RawURLEncoding.Decode(decoded, prev)
if err == nil {
return decoded[:actualDecoded], nil
}
return nil, err
}
return decoded[:actualDecoded], nil
}


func transformPrepend(prev []byte, value string) ([]byte, error) {
return append([]byte(value), prev...), nil
}
Expand Down