Deprecate KeyTemplate#getValue().

PiperOrigin-RevId: 545642524
Change-Id: Ibb49310088a195b913bac689dbc544a69c2de488
diff --git a/src/main/java/com/google/crypto/tink/KeyTemplate.java b/src/main/java/com/google/crypto/tink/KeyTemplate.java
index 8a5112c..56b3852 100644
--- a/src/main/java/com/google/crypto/tink/KeyTemplate.java
+++ b/src/main/java/com/google/crypto/tink/KeyTemplate.java
@@ -99,6 +99,13 @@
     return kt.getTypeUrl();
   }
 
+  /**
+   * @deprecated Instead, operate on the {@link Parameters} object obtained with {@link
+   *     #toParameters}. If you really need this array, you need to first use
+   *     TinkProtoParametersFormat to serialize this parameters object, then parse the result with
+   *     the Tink-internal proto class "KeyTemplate".
+   */
+  @Deprecated
   public byte[] getValue() {
     return kt.getValue().toByteArray();
   }