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/*
* Copyright © Ricki Hirner (bitfire web engineering).
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the GNU Public License v3.0
* which accompanies this distribution, and is available at
* http://www.gnu.org/licenses/gpl.html
*/
package at.bitfire.cert4android
import java.security.GeneralSecurityException
import java.security.KeyStore
import java.security.MessageDigest
import java.security.cert.X509Certificate
import java.util.*
import java.util.logging.Level
import javax.net.ssl.TrustManagerFactory
import javax.net.ssl.X509TrustManager
object CertUtils {
fun fingerprint(cert: X509Certificate, algorithm: String): String {
val md = MessageDigest.getInstance(algorithm)
return hexString(md.digest(cert.encoded))
}
fun getTrustManager(keyStore: KeyStore?): X509TrustManager? {
try {
val tmf = TrustManagerFactory.getInstance("X509")
tmf.init(keyStore)
tmf.trustManagers
.filterIsInstance<X509TrustManager>()
.forEach { return it }
} catch(e: GeneralSecurityException) {
Constants.log.log(Level.SEVERE, "Couldn't initialize trust manager", e)
}
return null
}
fun getTag(cert: X509Certificate): String {
val str = StringBuilder()
for (b in cert.signature)
str.append(String.format(Locale.ROOT, "%02x", b))
return str.toString()
}
fun hexString(data: ByteArray): String {
val str = StringBuilder()
for ((idx, b) in data.withIndex()) {
if (idx != 0)
str.append(':')
str.append(String.format("%02x", b).toUpperCase())
}
return str.toString()
}
}
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