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 class com.google.crypto.tink.subtle.EngineWrapper$TSignature implements com.google.crypto.tink.subtle.EngineWrapper<java.security.Signature>
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: com.google.crypto.tink.subtle.EngineWrapper$TSignature
  super_class: java.lang.Object
{
  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.google.crypto.tink.subtle.EngineWrapper$TSignature this
         0: .line 94
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // com.google.crypto.tink.subtle.EngineWrapper$TSignature this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/crypto/tink/subtle/EngineWrapper$TSignature;

  public java.security.Signature getInstance(java.lang.String, java.security.Provider);
    descriptor: (Ljava/lang/String;Ljava/security/Provider;)Ljava/security/Signature;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=3, args_size=3
        start local 0 // com.google.crypto.tink.subtle.EngineWrapper$TSignature this
        start local 1 // java.lang.String algorithm
        start local 2 // java.security.Provider provider
         0: .line 99
            aload 2 /* provider */
            ifnonnull 2
         1: .line 100
            aload 1 /* algorithm */
            invokestatic java.security.Signature.getInstance:(Ljava/lang/String;)Ljava/security/Signature;
            areturn
         2: .line 102
      StackMap locals:
      StackMap stack:
            aload 1 /* algorithm */
            aload 2 /* provider */
            invokestatic java.security.Signature.getInstance:(Ljava/lang/String;Ljava/security/Provider;)Ljava/security/Signature;
            areturn
        end local 2 // java.security.Provider provider
        end local 1 // java.lang.String algorithm
        end local 0 // com.google.crypto.tink.subtle.EngineWrapper$TSignature this
      LocalVariableTable:
        Start  End  Slot       Name  Signature
            0    3     0       this  Lcom/google/crypto/tink/subtle/EngineWrapper$TSignature;
            0    3     1  algorithm  Ljava/lang/String;
            0    3     2   provider  Ljava/security/Provider;
    Exceptions:
      throws java.security.GeneralSecurityException
    MethodParameters:
           Name  Flags
      algorithm  
      provider   

  public java.lang.Object getInstance(java.lang.String, java.security.Provider);
    descriptor: (Ljava/lang/String;Ljava/security/Provider;)Ljava/lang/Object;
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=3, locals=3, args_size=3
         0: .line 1
            aload 0
            aload 1
            aload 2
            invokevirtual com.google.crypto.tink.subtle.EngineWrapper$TSignature.getInstance:(Ljava/lang/String;Ljava/security/Provider;)Ljava/security/Signature;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
    Exceptions:
      throws java.security.GeneralSecurityException
}
Signature: Ljava/lang/Object;Lcom/google/crypto/tink/subtle/EngineWrapper<Ljava/security/Signature;>;
SourceFile: "EngineWrapper.java"
NestHost: com.google.crypto.tink.subtle.EngineWrapper
InnerClasses:
  public TSignature = com.google.crypto.tink.subtle.EngineWrapper$TSignature of com.google.crypto.tink.subtle.EngineWrapper