public java.lang.String getCryptoKeyName() {
      java.lang.Object ref = cryptoKeyName_;
      if (!(ref instanceof java.lang.String)) {
        com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
        java.lang.String s = bs.toStringUtf8();
        cryptoKeyName_ = s;
        return s;
      } else {
        return (java.lang.String) ref;
      }
    }
<pre>
Optional. The resource name of a KMS crypto key used to encrypt or decrypt
the data associated with the workflow.

Format:
projects/{project}/locations/{location}/keyRings/{keyRing}/cryptoKeys/{cryptoKey}

Using `-` as a wildcard for the `{project}` or not providing one at all
will infer the project from the account.

If not provided, data associated with the workflow will not be
CMEK-encrypted.
</pre>

<code>
string crypto_key_name = 11 [(.google.api.field_behavior) = OPTIONAL, (.google.api.resource_reference) = { ... }
</code>

@return The cryptoKeyName.
java-workflows/proto-google-cloud-workflows-v1/src/main/java/com/google/cloud/workflows/v1/Workflow.java