Remove SingleKeyJWSKeySelector

Closes gh-9348

Author: jzheaux

oauth2/oauth2-jose/src/main/java/org/springframework/security/oauth2/jwt/NimbusJwtDecoder.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2020 the original author or authors.
+ * Copyright 2002-2021 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -42,6 +42,7 @@
 import com.nimbusds.jose.proc.JWSKeySelector;
 import com.nimbusds.jose.proc.JWSVerificationKeySelector;
 import com.nimbusds.jose.proc.SecurityContext;
+import com.nimbusds.jose.proc.SingleKeyJWSKeySelector;
 import com.nimbusds.jose.util.Resource;
 import com.nimbusds.jose.util.ResourceRetriever;
 import com.nimbusds.jwt.JWT;

oauth2/oauth2-jose/src/main/java/org/springframework/security/oauth2/jwt/NimbusReactiveJwtDecoder.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2020 the original author or authors.
+ * Copyright 2002-2021 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -42,6 +42,7 @@
 import com.nimbusds.jose.proc.JWSKeySelector;
 import com.nimbusds.jose.proc.JWSVerificationKeySelector;
 import com.nimbusds.jose.proc.SecurityContext;
+import com.nimbusds.jose.proc.SingleKeyJWSKeySelector;
 import com.nimbusds.jwt.JWT;
 import com.nimbusds.jwt.JWTClaimsSet;
 import com.nimbusds.jwt.JWTParser;

oauth2/oauth2-jose/src/main/java/org/springframework/security/oauth2/jwt/SingleKeyJWSKeySelector.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2020 the original author or authors.
+ * Copyright 2002-2021 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -503,8 +503,7 @@ public void decodeWhenUsingSecretKeyAndIncorrectAlgorithmThenThrowsJwtException(
 				.macAlgorithm(MacAlgorithm.HS512)
 				.build();
 		assertThatExceptionOfType(BadJwtException.class)
-				.isThrownBy(() -> decoder.decode(signedJWT.serialize()))
-				.withMessageContaining("Unsupported algorithm of HS256");
+				.isThrownBy(() -> decoder.decode(signedJWT.serialize()));
 		// @formatter:on
 	}