http://github.com/google/tink: Tink is a small cryptographic library that provides a safe, simple, agile and fast way to accomplish some common cryptographic tasks. 
public interface com.google.crypto.tink.PrivateKeyManager<P> extends com.google.crypto.tink.KeyManager<P>
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: com.google.crypto.tink.PrivateKeyManager
  super_class: java.lang.Object
{
  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=3, locals=0, args_size=0
         0: .line 19
            new java.lang.Error
            dup
            ldc "Unresolved compilation problems: \n\tThe import com.google.crypto.tink.proto cannot be resolved\n\tKeyData cannot be resolved to a type\n"
            invokespecial java.lang.Error.<init>:(Ljava/lang/String;)V
            athrow
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public abstract KeyData getPublicKeyData(com.google.protobuf.ByteString);
    descriptor: (Lcom/google/protobuf/ByteString;)LKeyData;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Exceptions:
      throws java.security.GeneralSecurityException
    MethodParameters:
               Name  Flags
      serializedKey  
}
Signature: <P:Ljava/lang/Object;>Ljava/lang/Object;Lcom/google/crypto/tink/KeyManager<TP;>;
SourceFile: "PrivateKeyManager.java"