src/share/classes/java/security/Signature.java

*** 246,255 ****
--- 246,256 ----
  
      private static Signature getInstance(Instance instance, String algorithm) {
          Signature sig;
          if (instance.impl instanceof Signature) {
              sig = (Signature)instance.impl;
+             sig.algorithm = algorithm;
          } else {
              SignatureSpi spi = (SignatureSpi)instance.impl;
              sig = new Delegate(spi, algorithm);
          }
          sig.provider = instance.provider;