2026-08-21 08:45:25 +08:00
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package simcu::otp
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2026-08-21 08:43:24 +08:00
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import stdx.crypto.digest.SHA1
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/**
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* HMAC-SHA1 实现（RFC 2104 / RFC 4226 第 5 节）。
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* 仓颉标准库 std.crypto.digest 的 HMAC 目前仅支持 SHA512（HashType.SHA512），
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* 而 HOTP/TOTP 标准基于 HMAC-SHA1，故在此基于 stdx 的 SHA1 自实现（blockSize=64）。
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*/
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public class HmacSha1 {
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private let ipad: Array<Byte>
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private let opad: Array<Byte>
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public init(key: Array<Byte>) {
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let blockSize: Int64 = 64
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var tempKey = key
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if (key.size > blockSize) {
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let sha = SHA1()
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sha.write(key)
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tempKey = sha.finish()
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}
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ipad = Array<Byte>(blockSize, repeat: 0)
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opad = Array<Byte>(blockSize, repeat: 0)
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tempKey.copyTo(ipad, 0, 0, tempKey.size)
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tempKey.copyTo(opad, 0, 0, tempKey.size)
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for (i in 0..blockSize) {
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ipad[i] ^= 0x36
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opad[i] ^= 0x5c
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}
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}
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/// 计算 HMAC-SHA1(key, data)
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public func compute(data: Array<Byte>): Array<Byte> {
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let inner = SHA1()
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inner.write(ipad)
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inner.write(data)
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let innerHash = inner.finish()
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let outer = SHA1()
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outer.write(opad)
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outer.write(innerHash)
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outer.finish()
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}
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}
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