26 lines
927 B
Swift
26 lines
927 B
Swift
import CryptoKit
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import Foundation
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/// RFC 4251 fields shared by public keys, signatures, and agent replies.
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nonisolated enum SSHWireEncoding {
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static func uint32(_ value: UInt32) -> Data {
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var value = value.bigEndian
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return withUnsafeBytes(of: &value) { Data($0) }
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}
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static func field(_ data: Data) -> Data { uint32(UInt32(data.count)) + data }
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/// Encodes a nonnegative integer, including its SSH field length.
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static func mpint<S: DataProtocol>(_ bytes: S) -> Data {
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var value = Data(Data(bytes).drop(while: { $0 == 0 }))
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if value.first.map({ $0 & 0x80 != 0 }) == true { value.insert(0, at: value.startIndex) }
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return field(value)
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}
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static func fingerprint(of blob: Data) -> String {
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let digest = Data(SHA256.hash(data: blob)).base64EncodedString()
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.replacingOccurrences(of: "=", with: "")
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return "SHA256:\(digest)"
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}
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}
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