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diff --git a/src/tests/asn1_test.c b/src/tests/asn1_test.c
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+/*
+ * Copyright (C) 2016 Michael Brown <mbrown@fensystems.co.uk>.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+/** @file
+ *
+ * ASN.1 self-tests
+ *
+ */
+
+/* Forcibly enable assertions */
+#undef NDEBUG
+
+#include <stdlib.h>
+#include <assert.h>
+#include <ipxe/image.h>
+#include <ipxe/asn1.h>
+#include <ipxe/test.h>
+#include "asn1_test.h"
+
+/**
+ * Report ASN.1 test result
+ *
+ * @v test		ASN.1 test
+ * @v file		Test code file
+ * @v line		Test code line
+ */
+void asn1_okx ( struct asn1_test *test, const char *file, unsigned int line ) {
+	struct digest_algorithm *digest = &asn1_test_digest_algorithm;
+	struct asn1_cursor *cursor;
+	uint8_t ctx[digest->ctxsize];
+	uint8_t out[ASN1_TEST_DIGEST_SIZE];
+	unsigned int i;
+	size_t offset;
+	int next;
+
+	/* Sanity check */
+	assert ( sizeof ( out ) == digest->digestsize );
+
+	/* Correct image data pointer */
+	test->image->data = virt_to_user ( ( void * ) test->image->data );
+
+	/* Check that image is detected as correct type */
+	okx ( register_image ( test->image ) == 0, file, line );
+	okx ( test->image->type == test->type, file, line );
+
+	/* Check that all ASN.1 objects can be extracted */
+	for ( offset = 0, i = 0 ; i < test->count ; offset = next, i++ ) {
+
+		/* Extract ASN.1 object */
+		next = image_asn1 ( test->image, offset, &cursor );
+		okx ( next >= 0, file, line );
+		okx ( ( ( size_t ) next ) > offset, file, line );
+		if ( next > 0 ) {
+
+			/* Calculate digest of ASN.1 object */
+			digest_init ( digest, ctx );
+			digest_update ( digest, ctx, cursor->data,
+					cursor->len );
+			digest_final ( digest, ctx, out );
+
+			/* Compare against expected digest */
+			okx ( memcmp ( out, test->expected[i].digest,
+				       sizeof ( out ) ) == 0, file, line );
+
+			/* Free ASN.1 object */
+			free ( cursor );
+		}
+	}
+
+	/* Check that we have reached the end of the image */
+	okx ( offset == test->image->len, file, line );
+
+	/* Unregister image */
+	unregister_image ( test->image );
+}