diff --git a/asn1_decoder.h b/asn1_decoder.h
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--- /dev/null
+++ b/asn1_decoder.h
@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+
+#ifndef ASN1_DECODER_H_
+#define ASN1_DECODER_H_
+
+#include <stdint.h>
+
+typedef struct asn1_context asn1_context_t;
+
+asn1_context_t* asn1_context_new(uint8_t* buffer, size_t length);
+void asn1_context_free(asn1_context_t* ctx);
+asn1_context_t* asn1_constructed_get(asn1_context_t* ctx);
+bool asn1_constructed_skip_all(asn1_context_t* ctx);
+int asn1_constructed_type(asn1_context_t* ctx);
+asn1_context_t* asn1_sequence_get(asn1_context_t* ctx);
+asn1_context_t* asn1_set_get(asn1_context_t* ctx);
+bool asn1_sequence_next(asn1_context_t* seq);
+bool asn1_oid_get(asn1_context_t* ctx, uint8_t** oid, size_t* length);
+bool asn1_octet_string_get(asn1_context_t* ctx, uint8_t** octet_string, size_t* length);
+
+#endif /* ASN1_DECODER_H_ */