HmacSha1Signature签名方法 https://gist.github.com/ishikawa/88599/3195bdeecabeb38aa62872ab61877aefa6aef89e#gistcomment-2184166

HmacSha1Signature.kt

import java.security.InvalidKeyException
import java.security.NoSuchAlgorithmException
import java.security.SignatureException
import java.util.*
import javax.crypto.Mac
import javax.crypto.spec.SecretKeySpec

object HmacSha1Signature {
  private val HMAC_SHA1_ALGORITHM = "HmacSHA1"

  private fun toHexString(bytes: ByteArray): String {
    val formatter = Formatter()

    for (b in bytes) {
      formatter.format("%02x", b)
    }

    return formatter.toString()
  }

  @Throws(SignatureException::class, NoSuchAlgorithmException::class, InvalidKeyException::class)
  fun calculateRFC2104HMAC(data: String, key: String): String {
    val signingKey = SecretKeySpec(key.toByteArray(), HMAC_SHA1_ALGORITHM)
    val mac = Mac.getInstance(HMAC_SHA1_ALGORITHM)
    mac.init(signingKey)
    return toHexString(mac.doFinal(data.toByteArray()))
  }
}