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Fix padding bug (#83)

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Max Goedjen 2020-04-02 00:43:45 -07:00 committed by GitHub
parent f1e8e43f62
commit ccbf92785d
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1 changed files with 11 additions and 2 deletions
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13
SecretAgentKit/Agent.swift
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@ -113,8 +113,17 @@ extension Agent {
let rawLength = rawRepresentation.count/2
let r = rawRepresentation[0..<rawLength]
let s = rawRepresentation[rawLength...]
// Check if we need to pad with 0x00 to prevent certain
// ssh servers from thinking r or s is negative
let paddingRange: ClosedRange<UInt8> = 0x80...0xFF
var r = Data(rawRepresentation[0..<rawLength])
if paddingRange ~= r.first! {
r.insert(0x00, at: 0)
}
var s = Data(rawRepresentation[rawLength...])
if paddingRange ~= s.first! {
s.insert(0x00, at: 0)
}
var signatureChunk = Data()
signatureChunk.append(writer.lengthAndData(of: r))