[crypto] Add DER image format

Add DER-encoded ASN.1 as an image format.  There is no fixed signature
for DER files.  We treat an image as DER if it comprises a single
valid SEQUENCE object covering the entire length of the image.

Signed-off-by: Michael Brown <mcb30@ipxe.org>

1 files changed, 73 insertions, 0 deletions

diff --git a/src/tests/asn1_test.h b/src/tests/asn1_test.h
new file mode 100644
index 00000000..c8167ed3
--- /dev/null
+++ b/src/tests/asn1_test.h
@@ -0,0 +1,73 @@
+#ifndef _ASN1_TEST_H
+#define _ASN1_TEST_H
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+#include <stdint.h>
+#include <ipxe/image.h>
+#include <ipxe/sha1.h>
+#include <ipxe/test.h>
+
+/** Digest algorithm used for ASN.1 tests */
+#define asn1_test_digest_algorithm sha1_algorithm
+
+/** Digest size used for ASN.1 tests */
+#define ASN1_TEST_DIGEST_SIZE SHA1_DIGEST_SIZE
+
+/** An ASN.1 test digest */
+struct asn1_test_digest {
+	/** Digest value */
+	uint8_t digest[ASN1_TEST_DIGEST_SIZE];
+};
+
+/** An ASN.1 test */
+struct asn1_test {
+	/** Image type */
+	struct image_type *type;
+	/** Source image */
+	struct image *image;
+	/** Expected digests of ASN.1 objects */
+	struct asn1_test_digest *expected;
+	/** Number of ASN.1 objects */
+	unsigned int count;
+};
+
+/**
+ * Define an ASN.1 test
+ *
+ * @v _name		Test name
+ * @v _type		Test image file type
+ * @v _file		Test image file data
+ * @v ...		Expected ASN.1 object digests
+ * @ret test		ASN.1 test
+ */
+#define ASN1( _name, _type, _file, ... )				\
+	static const char _name ## __file[] = _file;			\
+	static struct image _name ## __image = {			\
+		.refcnt = REF_INIT ( ref_no_free ),			\
+		.name = #_name,						\
+		.data = ( userptr_t ) ( _name ## __file ),		\
+		.len = sizeof ( _name ## __file ),			\
+	};								\
+	static struct asn1_test_digest _name ## _expected[] = {		\
+		__VA_ARGS__						\
+	};								\
+	static struct asn1_test _name = {				\
+		.type = _type,						\
+		.image = & _name ## __image,				\
+		.expected = _name ## _expected,				\
+		.count = ( sizeof ( _name ## _expected ) /		\
+			   sizeof ( _name ## _expected[0] ) ),		\
+	};
+
+extern void asn1_okx ( struct asn1_test *test, const char *file,
+		       unsigned int line );
+
+/**
+ * Report ASN.1 test result
+ *
+ * @v test		ASN.1 test
+ */
+#define asn1_ok( test ) asn1_okx ( test, __FILE__, __LINE__ )
+
+#endif /* _ASN1_TEST_H */