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 abstract class com.google.crypto.tink.KeyTypeManager<KeyProtoT extends com.google.protobuf.MessageLite>
  minor version: 0
  major version: 59
  flags: flags: (0x0421) ACC_PUBLIC, ACC_SUPER, ACC_ABSTRACT
  this_class: com.google.crypto.tink.KeyTypeManager
  super_class: java.lang.Object
{
  private final java.lang.Class<KeyProtoT> clazz;
    descriptor: Ljava/lang/Class;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL
    Signature: Ljava/lang/Class<TKeyProtoT;>;

  private final java.util.Map<java.lang.Class<?>, com.google.crypto.tink.KeyTypeManager$PrimitiveFactory<?, KeyProtoT>> factories;
    descriptor: Ljava/util/Map;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL
    Signature: Ljava/util/Map<Ljava/lang/Class<*>;Lcom/google/crypto/tink/KeyTypeManager$PrimitiveFactory<*TKeyProtoT;>;>;

  private final java.lang.Class<?> firstPrimitiveClass;
    descriptor: Ljava/lang/Class;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL
    Signature: Ljava/lang/Class<*>;

  protected void <init>(java.lang.Class<KeyProtoT>, com.google.crypto.tink.KeyTypeManager$PrimitiveFactory<?, KeyProtoT>[]);
    descriptor: (Ljava/lang/Class;[Lcom/google/crypto/tink/KeyTypeManager$PrimitiveFactory;)V
    flags: (0x0084) ACC_PROTECTED, ACC_VARARGS
    Code:
      stack=5, locals=8, args_size=3
        start local 0 // com.google.crypto.tink.KeyTypeManager this
        start local 1 // java.lang.Class clazz
        start local 2 // com.google.crypto.tink.KeyTypeManager$PrimitiveFactory[] factories
         0: .line 88
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 89
            aload 0 /* this */
            aload 1 /* clazz */
            putfield com.google.crypto.tink.KeyTypeManager.clazz:Ljava/lang/Class;
         2: .line 90
            new java.util.HashMap
            dup
            invokespecial java.util.HashMap.<init>:()V
            astore 3 /* factoriesMap */
        start local 3 // java.util.Map factoriesMap
         3: .line 91
            aload 2 /* factories */
            dup
            astore 7
            arraylength
            istore 6
            iconst_0
            istore 5
            goto 13
      StackMap locals: com.google.crypto.tink.KeyTypeManager java.lang.Class com.google.crypto.tink.KeyTypeManager$PrimitiveFactory[] java.util.Map top int int com.google.crypto.tink.KeyTypeManager$PrimitiveFactory[]
      StackMap stack:
         4: aload 7
            iload 5
            aaload
            astore 4 /* factory */
        start local 4 // com.google.crypto.tink.KeyTypeManager$PrimitiveFactory factory
         5: .line 92
            aload 3 /* factoriesMap */
            aload 4 /* factory */
            invokevirtual com.google.crypto.tink.KeyTypeManager$PrimitiveFactory.getPrimitiveClass:()Ljava/lang/Class;
            invokeinterface java.util.Map.containsKey:(Ljava/lang/Object;)Z
            ifeq 11
         6: .line 93
            new java.lang.IllegalArgumentException
            dup
         7: .line 94
            new java.lang.StringBuilder
            dup
            ldc "KeyTypeManager constructed with duplicate factories for primitive "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
         8: .line 95
            aload 4 /* factory */
            invokevirtual com.google.crypto.tink.KeyTypeManager$PrimitiveFactory.getPrimitiveClass:()Ljava/lang/Class;
            invokevirtual java.lang.Class.getCanonicalName:()Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
         9: .line 94
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
        10: .line 93
            invokespecial java.lang.IllegalArgumentException.<init>:(Ljava/lang/String;)V
            athrow
        11: .line 97
      StackMap locals: com.google.crypto.tink.KeyTypeManager java.lang.Class com.google.crypto.tink.KeyTypeManager$PrimitiveFactory[] java.util.Map com.google.crypto.tink.KeyTypeManager$PrimitiveFactory int int com.google.crypto.tink.KeyTypeManager$PrimitiveFactory[]
      StackMap stack:
            aload 3 /* factoriesMap */
            aload 4 /* factory */
            invokevirtual com.google.crypto.tink.KeyTypeManager$PrimitiveFactory.getPrimitiveClass:()Ljava/lang/Class;
            aload 4 /* factory */
            invokeinterface java.util.Map.put:(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
            pop
        end local 4 // com.google.crypto.tink.KeyTypeManager$PrimitiveFactory factory
        12: .line 91
            iinc 5 1
      StackMap locals: com.google.crypto.tink.KeyTypeManager java.lang.Class com.google.crypto.tink.KeyTypeManager$PrimitiveFactory[] java.util.Map top int int com.google.crypto.tink.KeyTypeManager$PrimitiveFactory[]
      StackMap stack:
        13: iload 5
            iload 6
            if_icmplt 4
        14: .line 99
            aload 2 /* factories */
            arraylength
            ifle 17
        15: .line 100
            aload 0 /* this */
            aload 2 /* factories */
            iconst_0
            aaload
            invokevirtual com.google.crypto.tink.KeyTypeManager$PrimitiveFactory.getPrimitiveClass:()Ljava/lang/Class;
            putfield com.google.crypto.tink.KeyTypeManager.firstPrimitiveClass:Ljava/lang/Class;
        16: .line 101
            goto 18
        17: .line 102
      StackMap locals: com.google.crypto.tink.KeyTypeManager java.lang.Class com.google.crypto.tink.KeyTypeManager$PrimitiveFactory[] java.util.Map
      StackMap stack:
            aload 0 /* this */
            ldc Ljava/lang/Void;
            putfield com.google.crypto.tink.KeyTypeManager.firstPrimitiveClass:Ljava/lang/Class;
        18: .line 104
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            aload 3 /* factoriesMap */
            invokestatic java.util.Collections.unmodifiableMap:(Ljava/util/Map;)Ljava/util/Map;
            putfield com.google.crypto.tink.KeyTypeManager.factories:Ljava/util/Map;
        19: .line 105
            return
        end local 3 // java.util.Map factoriesMap
        end local 2 // com.google.crypto.tink.KeyTypeManager$PrimitiveFactory[] factories
        end local 1 // java.lang.Class clazz
        end local 0 // com.google.crypto.tink.KeyTypeManager this
      LocalVariableTable:
        Start  End  Slot          Name  Signature
            0   20     0          this  Lcom/google/crypto/tink/KeyTypeManager<TKeyProtoT;>;
            0   20     1         clazz  Ljava/lang/Class<TKeyProtoT;>;
            0   20     2     factories  [Lcom/google/crypto/tink/KeyTypeManager$PrimitiveFactory;
            3   20     3  factoriesMap  Ljava/util/Map<Ljava/lang/Class<*>;Lcom/google/crypto/tink/KeyTypeManager$PrimitiveFactory<*TKeyProtoT;>;>;
            5   12     4       factory  Lcom/google/crypto/tink/KeyTypeManager$PrimitiveFactory<*TKeyProtoT;>;
    Signature: (Ljava/lang/Class<TKeyProtoT;>;[Lcom/google/crypto/tink/KeyTypeManager$PrimitiveFactory<*TKeyProtoT;>;)V
    RuntimeVisibleAnnotations: 
      java.lang.SafeVarargs()
    MethodParameters:
           Name  Flags
      clazz      
      factories  

  public final java.lang.Class<KeyProtoT> getKeyClass();
    descriptor: ()Ljava/lang/Class;
    flags: (0x0011) ACC_PUBLIC, ACC_FINAL
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.google.crypto.tink.KeyTypeManager this
         0: .line 109
            aload 0 /* this */
            getfield com.google.crypto.tink.KeyTypeManager.clazz:Ljava/lang/Class;
            areturn
        end local 0 // com.google.crypto.tink.KeyTypeManager this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/crypto/tink/KeyTypeManager<TKeyProtoT;>;
    Signature: ()Ljava/lang/Class<TKeyProtoT;>;

  public abstract java.lang.String getKeyType();
    descriptor: ()Ljava/lang/String;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT

  public abstract int getVersion();
    descriptor: ()I
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT

  public KeyMaterialType keyMaterialType();
    descriptor: ()LKeyMaterialType;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // com.google.crypto.tink.KeyTypeManager this
         0: .line 119
            new java.lang.Error
            dup
            ldc "Unresolved compilation problem: \n\tKeyMaterialType cannot be resolved to a type\n"
            invokespecial java.lang.Error.<init>:(Ljava/lang/String;)V
            athrow
        end local 0 // com.google.crypto.tink.KeyTypeManager this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/crypto/tink/KeyTypeManager<TKeyProtoT;>;

  public abstract KeyProtoT parseKey(com.google.protobuf.ByteString);
    descriptor: (Lcom/google/protobuf/ByteString;)Lcom/google/protobuf/MessageLite;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Exceptions:
      throws com.google.protobuf.InvalidProtocolBufferException
    Signature: (Lcom/google/protobuf/ByteString;)TKeyProtoT;
    MethodParameters:
            Name  Flags
      byteString  

  public abstract void validateKey();
    descriptor: (Lcom/google/protobuf/MessageLite;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Exceptions:
      throws java.security.GeneralSecurityException
    Signature: (TKeyProtoT;)V
    MethodParameters:
          Name  Flags
      keyProto  

  public final <P> P getPrimitive(KeyProtoT, java.lang.Class<P>);
    descriptor: (Lcom/google/protobuf/MessageLite;Ljava/lang/Class;)Ljava/lang/Object;
    flags: (0x0011) ACC_PUBLIC, ACC_FINAL
    Code:
      stack=5, locals=4, args_size=3
        start local 0 // com.google.crypto.tink.KeyTypeManager this
        start local 1 // com.google.protobuf.MessageLite key
        start local 2 // java.lang.Class primitiveClass
         0: .line 147
            aload 0 /* this */
            getfield com.google.crypto.tink.KeyTypeManager.factories:Ljava/util/Map;
            aload 2 /* primitiveClass */
            invokeinterface java.util.Map.get:(Ljava/lang/Object;)Ljava/lang/Object;
            checkcast com.google.crypto.tink.KeyTypeManager$PrimitiveFactory
         1: .line 146
            astore 3 /* factory */
        start local 3 // com.google.crypto.tink.KeyTypeManager$PrimitiveFactory factory
         2: .line 148
            aload 3 /* factory */
            ifnonnull 6
         3: .line 149
            new java.lang.IllegalArgumentException
            dup
         4: .line 150
            new java.lang.StringBuilder
            dup
            ldc "Requested primitive class "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            aload 2 /* primitiveClass */
            invokevirtual java.lang.Class.getCanonicalName:()Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            ldc " not supported."
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
         5: .line 149
            invokespecial java.lang.IllegalArgumentException.<init>:(Ljava/lang/String;)V
            athrow
         6: .line 152
      StackMap locals: com.google.crypto.tink.KeyTypeManager$PrimitiveFactory
      StackMap stack:
            aload 3 /* factory */
            aload 1 /* key */
            invokevirtual com.google.crypto.tink.KeyTypeManager$PrimitiveFactory.getPrimitive:(Ljava/lang/Object;)Ljava/lang/Object;
            areturn
        end local 3 // com.google.crypto.tink.KeyTypeManager$PrimitiveFactory factory
        end local 2 // java.lang.Class primitiveClass
        end local 1 // com.google.protobuf.MessageLite key
        end local 0 // com.google.crypto.tink.KeyTypeManager this
      LocalVariableTable:
        Start  End  Slot            Name  Signature
            0    7     0            this  Lcom/google/crypto/tink/KeyTypeManager<TKeyProtoT;>;
            0    7     1             key  TKeyProtoT;
            0    7     2  primitiveClass  Ljava/lang/Class<TP;>;
            2    7     3         factory  Lcom/google/crypto/tink/KeyTypeManager$PrimitiveFactory<TP;TKeyProtoT;>;
    Exceptions:
      throws java.security.GeneralSecurityException
    Signature: <P:Ljava/lang/Object;>(TKeyProtoT;Ljava/lang/Class<TP;>;)TP;
    MethodParameters:
                Name  Flags
      key             
      primitiveClass  

  public final java.util.Set<java.lang.Class<?>> supportedPrimitives();
    descriptor: ()Ljava/util/Set;
    flags: (0x0011) ACC_PUBLIC, ACC_FINAL
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.google.crypto.tink.KeyTypeManager this
         0: .line 159
            aload 0 /* this */
            getfield com.google.crypto.tink.KeyTypeManager.factories:Ljava/util/Map;
            invokeinterface java.util.Map.keySet:()Ljava/util/Set;
            areturn
        end local 0 // com.google.crypto.tink.KeyTypeManager this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/crypto/tink/KeyTypeManager<TKeyProtoT;>;
    Signature: ()Ljava/util/Set<Ljava/lang/Class<*>;>;

  final java.lang.Class<?> firstSupportedPrimitiveClass();
    descriptor: ()Ljava/lang/Class;
    flags: (0x0010) ACC_FINAL
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.google.crypto.tink.KeyTypeManager this
         0: .line 167
            aload 0 /* this */
            getfield com.google.crypto.tink.KeyTypeManager.firstPrimitiveClass:Ljava/lang/Class;
            areturn
        end local 0 // com.google.crypto.tink.KeyTypeManager this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/crypto/tink/KeyTypeManager<TKeyProtoT;>;
    Signature: ()Ljava/lang/Class<*>;

  public com.google.crypto.tink.KeyTypeManager$KeyFactory<?, KeyProtoT> keyFactory();
    descriptor: ()Lcom/google/crypto/tink/KeyTypeManager$KeyFactory;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // com.google.crypto.tink.KeyTypeManager this
         0: .line 240
            new java.lang.UnsupportedOperationException
            dup
            ldc "Creating keys is not supported."
            invokespecial java.lang.UnsupportedOperationException.<init>:(Ljava/lang/String;)V
            athrow
        end local 0 // com.google.crypto.tink.KeyTypeManager this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/crypto/tink/KeyTypeManager<TKeyProtoT;>;
    Signature: ()Lcom/google/crypto/tink/KeyTypeManager$KeyFactory<*TKeyProtoT;>;
}
Signature: <KeyProtoT::Lcom/google/protobuf/MessageLite;>Ljava/lang/Object;
SourceFile: "KeyTypeManager.java"
NestMembers:
  com.google.crypto.tink.KeyTypeManager$KeyFactory  com.google.crypto.tink.KeyTypeManager$PrimitiveFactory
InnerClasses:
  public abstract KeyFactory = com.google.crypto.tink.KeyTypeManager$KeyFactory of com.google.crypto.tink.KeyTypeManager
  protected abstract PrimitiveFactory = com.google.crypto.tink.KeyTypeManager$PrimitiveFactory of com.google.crypto.tink.KeyTypeManager
    RuntimeInvisibleAnnotations: 
      com.google.crypto.tink.annotations.Alpha()