[crypto] Add PEM image format

Add PEM-encoded ASN.1 as an image format.  We accept as PEM any image
containing a line starting with a "-----BEGIN" boundary marker.

We allow for PEM files containing multiple ASN.1 objects, such as a
certificate chain produced by concatenating individual certificate
files.

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

src/tests/pem_test.c

@@ -0,0 +1,107 @@
+/*
+ * 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
+ *
+ * PEM self-tests
+ *
+ */
+
+/* Forcibly enable assertions */
+#undef NDEBUG
+
+#include <string.h>
+#include <assert.h>
+#include <ipxe/test.h>
+#include <ipxe/pem.h>
+#include "asn1_test.h"
+
+/** Define inline expected digest */
+#define DIGEST(...) { { __VA_ARGS__ } }
+
+/** Single RSA private key */
+ASN1 ( single, &pem_image_type,
+       "-----BEGIN RSA PRIVATE KEY-----\n"
+       "MCwCAQACBQC6loItAgMBAAECBCqhYIkCAwDyVwIDAMUbAgMAr9kCAmr9AgIaWQ==\n"
+       "-----END RSA PRIVATE KEY-----\n",
+       DIGEST ( 0xb9, 0x38, 0x83, 0xcd, 0xf4, 0x58, 0xa9, 0xa2, 0x84, 0x11,
+		0xfa, 0x0b, 0x6f, 0xdc, 0x3e, 0xa3, 0x7c, 0x90, 0x7c, 0x2d ) );
+
+/** Three concatenated RSA private keys */
+ASN1 ( multiple, &pem_image_type,
+       "-----BEGIN RSA PRIVATE KEY-----\n"
+       "MCwCAQACBQDtbjyVAgMBAAECBQCEOtJxAgMA+xsCAwDyDwICLGsCAgqTAgIxVQ==\n"
+       "-----END RSA PRIVATE KEY-----\n"
+       "-----BEGIN RSA PRIVATE KEY-----\n"
+       "MCwCAQACBQC3VlyxAgMBAAECBGakxDUCAwDanwIDANavAgIBWQICTuECAwCmWg==\n"
+       "-----END RSA PRIVATE KEY-----\n"
+       "-----BEGIN RSA PRIVATE KEY-----\n"
+       "MCwCAQACBQC89dS1AgMBAAECBQCxjnLBAgMA3qcCAwDZQwICP3cCAgpRAgI57A==\n"
+       "-----END RSA PRIVATE KEY-----\n",
+       DIGEST ( 0x9c, 0xb2, 0xc1, 0xa0, 0x9c, 0xcb, 0x11, 0xbf, 0x80, 0xd0,
+		0x8c, 0xe5, 0xda, 0xf2, 0x3b, 0x2c, 0xca, 0x64, 0x25, 0x8a ),
+       DIGEST ( 0x82, 0x66, 0x24, 0xd9, 0xc3, 0x98, 0x1e, 0x5e, 0x56, 0xed,
+		0xd0, 0xd0, 0x2a, 0x5e, 0x9c, 0x3a, 0x58, 0xdf, 0x76, 0x0d ),
+       DIGEST ( 0x01, 0xd2, 0x8a, 0x74, 0x42, 0x08, 0x0f, 0xb0, 0x03, 0x82,
+		0xcd, 0xa3, 0xdc, 0x78, 0xfe, 0xd7, 0xa3, 0x28, 0xfc, 0x29 ) );
+
+/** Two RSA private keys with various bits of noise added */
+ASN1 ( noisy, &pem_image_type,
+       "Hello world!  This is uninteresting stuff before the actual data.\n"
+       "-----BEGIN RSA PRIVATE KEY-----\n"
+       "MCwCAQACBQC3VlyxAgMBAAECBGakxDUCAwDanwIDANavAgIBWQICTuECAwCmWg==\n"
+       "-----END RSA PRIVATE KEY-----\n"
+       "Here is some more uninteresting stuff.\n"
+       "Followed by what is actually another RSA private key, but with "
+       "extra whitespace added, and the description change to pretend "
+       "it's a certificate\n"
+       "-----BEGIN CERTIFICATE-----\n"
+       "   MCwCAQACBQC6loItAgMBAAECBCqhYIkCAwD\r\n"
+       "   yVwIDAMUbAgMAr9kCAmr9AgIaWQ==  \r\n"
+       "-----END CERTIFICATE-----\n"
+       "and some trailing garbage as well\n"
+       "and more garbage with no final newline",
+       DIGEST ( 0x82, 0x66, 0x24, 0xd9, 0xc3, 0x98, 0x1e, 0x5e, 0x56, 0xed,
+		0xd0, 0xd0, 0x2a, 0x5e, 0x9c, 0x3a, 0x58, 0xdf, 0x76, 0x0d ),
+       DIGEST ( 0xb9, 0x38, 0x83, 0xcd, 0xf4, 0x58, 0xa9, 0xa2, 0x84, 0x11,
+		0xfa, 0x0b, 0x6f, 0xdc, 0x3e, 0xa3, 0x7c, 0x90, 0x7c, 0x2d ) );
+
+/**
+ * Perform PEM self-test
+ *
+ */
+static void pem_test_exec ( void ) {
+
+	/* Perform tests */
+	asn1_ok ( &single );
+	asn1_ok ( &multiple );
+	asn1_ok ( &noisy );
+}
+
+/** PEM self-test */
+struct self_test pem_test __self_test = {
+	.name = "pem",
+	.exec = pem_test_exec,
+};

src/tests/tests.c

@@ -70,3 +70,4 @@ REQUIRE_OBJECT ( linebuf_test );
 REQUIRE_OBJECT ( iobuf_test );
 REQUIRE_OBJECT ( bitops_test );
 REQUIRE_OBJECT ( der_test );
+REQUIRE_OBJECT ( pem_test );