com.nimbusds.jose.jwk.ThumbprintUtils Maven / Gradle / Ivy
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package com.nimbusds.jose.jwk;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.LinkedHashMap;
import com.nimbusds.jose.JOSEException;
import com.nimbusds.jose.util.Base64URL;
import com.nimbusds.jose.util.StandardCharset;
import net.minidev.json.JSONObject;
/**
* Thumbprint utilities.
*
* See RFC 7638.
*
* @author Vladimir Dzhuvinov
* @version 2016-07-26
*/
public final class ThumbprintUtils {
/**
* Computes the SHA-256 thumbprint for the specified JWK.
*
* @param jwk The JWK. Must not be {@code null}.
*
* @return The JWK thumbprint.
*
* @throws JOSEException If the SHA-256 hash algorithm is not
* supported.
*/
public static Base64URL compute(final JWK jwk)
throws JOSEException {
return compute("SHA-256", jwk);
}
/**
* Computes the thumbprint for the specified JWK.
*
* @param hashAlg The hash algorithm. Must not be {@code null}.
* @param jwk The JWK. Must not be {@code null}.
*
* @return The JWK thumbprint.
*
* @throws JOSEException If the hash algorithm is not supported.
*/
public static Base64URL compute(final String hashAlg, final JWK jwk)
throws JOSEException {
final LinkedHashMap orderedParams = jwk.getRequiredParams();
return compute(hashAlg, orderedParams);
}
/**
* Computes the thumbprint for the specified required JWK parameters.
*
* @param hashAlg The hash algorithm. Must not be {@code null}.
* @param params The required JWK parameters, alphanumerically sorted
* by parameter name and ready for JSON object
* serialisation. Must not be {@code null}.
*
* @return The JWK thumbprint.
*
* @throws JOSEException If the hash algorithm is not supported.
*/
public static Base64URL compute(final String hashAlg, final LinkedHashMap params)
throws JOSEException {
final String json = JSONObject.toJSONString(params);
final MessageDigest md;
try {
md = MessageDigest.getInstance(hashAlg);
} catch (NoSuchAlgorithmException e) {
throw new JOSEException("Couldn't compute JWK thumbprint: Unsupported hash algorithm: " + e.getMessage(), e);
}
md.update(json.getBytes(StandardCharset.UTF_8));
return Base64URL.encode(md.digest());
}
}