1 files changed, 37 insertions, 0 deletions
diff --git a/security-utils/src/main/java/com/yahoo/security/SignatureUtils.java b/security-utils/src/main/java/com/yahoo/security/SignatureUtils.java
new file mode 100644
index 00000000000..7560fbbd40d
--- /dev/null
+++ b/security-utils/src/main/java/com/yahoo/security/SignatureUtils.java
@@ -0,0 +1,37 @@
+// Copyright 2019 Oath Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.security;
+
+import java.security.GeneralSecurityException;
+import java.security.PrivateKey;
+import java.security.PublicKey;
+import java.security.Signature;
+
+/**
+ * Misc signature utils
+ *
+ * @author bjorncs
+ */
+public class SignatureUtils {
+
+    /** Returns a signature instance which computes a hash of its content, before signing with the given private key. */
+    public static Signature createSigner(PrivateKey key, SignatureAlgorithm algorithm) {
+        try {
+            Signature signer = Signature.getInstance(algorithm.getAlgorithmName(), BouncyCastleProviderHolder.getInstance());
+            signer.initSign(key);
+            return signer;
+        } catch (GeneralSecurityException e) {
+            throw new IllegalStateException(e);
+        }
+    }
+
+    /** Returns a signature instance which computes a hash of its content, before verifying with the given public key. */
+    public static Signature createVerifier(PublicKey key, SignatureAlgorithm algorithm) {
+        try {
+            Signature signer = Signature.getInstance(algorithm.getAlgorithmName(), BouncyCastleProviderHolder.getInstance());
+            signer.initVerify(key);
+            return signer;
+        } catch (GeneralSecurityException e) {
+            throw new IllegalStateException(e);
+        }
+    }
+}