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Build public key once on Jwk #195

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Build public key once on Jwk #195

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17 changes: 11 additions & 6 deletions src/main/java/com/auth0/jwk/Jwk.java
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Original file line number Diff line number Diff line change
Expand Up @@ -39,6 +39,8 @@ public class Jwk {
private final String certificateThumbprint;
private final Map<String, Object> additionalAttributes;

private PublicKey publicKey;

/**
* Creates a new Jwk
*
Expand Down Expand Up @@ -174,15 +176,20 @@ public Map<String, Object> getAdditionalAttributes() {
*/
@SuppressWarnings("WeakerAccess")
public PublicKey getPublicKey() throws InvalidPublicKeyException {
PublicKey publicKey = null;
if (publicKey == null) {
buildPublicKey();
}
return publicKey;
}

private void buildPublicKey() throws InvalidPublicKeyException {
switch (type) {
case ALGORITHM_RSA:
try {
KeyFactory kf = KeyFactory.getInstance(ALGORITHM_RSA);
KeyFactory keyFactory = KeyFactory.getInstance(ALGORITHM_RSA);
BigInteger modulus = new BigInteger(1, Base64.getUrlDecoder().decode(stringValue("n")));
BigInteger exponent = new BigInteger(1, Base64.getUrlDecoder().decode(stringValue("e")));
publicKey = kf.generatePublic(new RSAPublicKeySpec(modulus, exponent));
publicKey = keyFactory.generatePublic(new RSAPublicKeySpec(modulus, exponent));
} catch (InvalidKeySpecException e) {
throw new InvalidPublicKeyException("Invalid public key", e);
} catch (NoSuchAlgorithmException e) {
Expand All @@ -194,7 +201,7 @@ public PublicKey getPublicKey() throws InvalidPublicKeyException {
try {
KeyFactory keyFactory = KeyFactory.getInstance(ALGORITHM_ELLIPTIC_CURVE);
ECPoint ecPoint = new ECPoint(new BigInteger(1, Base64.getUrlDecoder().decode(stringValue("x"))),
new BigInteger(1, Base64.getUrlDecoder().decode(stringValue("y"))));
new BigInteger(1, Base64.getUrlDecoder().decode(stringValue("y"))));
AlgorithmParameters algorithmParameters = AlgorithmParameters.getInstance(ALGORITHM_ELLIPTIC_CURVE);

String curve = stringValue("crv");
Expand Down Expand Up @@ -224,8 +231,6 @@ public PublicKey getPublicKey() throws InvalidPublicKeyException {
default:
throw new InvalidPublicKeyException("The key type of " + type + " is not supported");
}

return publicKey;
}

private String stringValue(String key) {
Expand Down