From eabc5796904a8a1a726f9d502d8adb2716b6cec0 Mon Sep 17 00:00:00 2001
From: tb <tb@openbsd.org>
Date: Mon, 16 May 2022 20:53:20 +0000
Subject: [PATCH] Add a simple test that exercises ASN1_STRING_to_UTF8() a
 little.

---
 regress/lib/libcrypto/asn1/Makefile           |   3 +-
 .../lib/libcrypto/asn1/asn1_string_to_utf8.c  | 128 ++++++++++++++++++
 2 files changed, 130 insertions(+), 1 deletion(-)
 create mode 100644 regress/lib/libcrypto/asn1/asn1_string_to_utf8.c

diff --git a/regress/lib/libcrypto/asn1/Makefile b/regress/lib/libcrypto/asn1/Makefile
index 0cb0c58d957..d7d8de8b6dd 100644
--- a/regress/lib/libcrypto/asn1/Makefile
+++ b/regress/lib/libcrypto/asn1/Makefile
@@ -1,4 +1,4 @@
-#	$OpenBSD: Makefile,v 1.16 2022/02/26 16:45:31 jsing Exp $
+#	$OpenBSD: Makefile,v 1.17 2022/05/16 20:53:20 tb Exp $
 
 PROGS = \
 	asn1api \
@@ -7,6 +7,7 @@ PROGS = \
 	asn1evp \
 	asn1object \
 	asn1string_copy \
+	asn1_string_to_utf8 \
 	asn1time \
 	asn1x509 \
 	rfc5280time \
diff --git a/regress/lib/libcrypto/asn1/asn1_string_to_utf8.c b/regress/lib/libcrypto/asn1/asn1_string_to_utf8.c
new file mode 100644
index 00000000000..2ead7b46c3b
--- /dev/null
+++ b/regress/lib/libcrypto/asn1/asn1_string_to_utf8.c
@@ -0,0 +1,128 @@
+/*	$OpenBSD: asn1_string_to_utf8.c,v 1.1 2022/05/16 20:53:20 tb Exp $ */
+/*
+ * Copyright (c) 2022 Theo Buehler <tb@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <err.h>
+#include <string.h>
+
+#include <openssl/asn1.h>
+
+struct asn1_string_to_utf8_test_case {
+	const char *description;
+	const ASN1_ITEM *item;
+	const uint8_t der[32];
+	size_t der_len;
+	const uint8_t want[32];
+	int want_len;
+};
+
+static const struct asn1_string_to_utf8_test_case tests[] = {
+	{
+		.description = "hello",
+		.item = &ASN1_PRINTABLESTRING_it,
+		.der = {
+			0x13, 0x05, 0x68, 0x65, 0x6c, 0x6c, 0x6f,
+		},
+		.der_len = 7,
+		.want = {
+			0x68, 0x65, 0x6c, 0x6c, 0x6f,
+		},
+		.want_len = 5,
+	},
+	{
+		.description = "face with tears of joy",
+		.item = &ASN1_UTF8STRING_it,
+		.der = {
+			0x0c, 0x04, 0xF0, 0x9F, 0x98, 0x82,
+		},
+		.der_len = 6,
+		.want = {
+			0xF0, 0x9F, 0x98, 0x82,
+		},
+		.want_len = 4,
+	},
+	{
+		.description = "hi",
+		.item = &ASN1_IA5STRING_it,
+		.der = {
+			0x16, 0x02, 0x68, 0x69,
+		},
+		.der_len = 4,
+		.want = {
+			0x68, 0x69,
+		},
+		.want_len = 2,
+	},
+};
+
+const size_t N_TESTS = sizeof(tests) / sizeof(tests[0]);
+
+static int
+asn1_string_to_utf8_test(const struct asn1_string_to_utf8_test_case *test)
+{
+	ASN1_STRING *str = NULL;
+	const unsigned char *der;
+	unsigned char *out = NULL;
+	int ret;
+	int failed = 1;
+
+	der = test->der;
+	if ((str = (ASN1_STRING *)ASN1_item_d2i(NULL, &der, test->der_len,
+	    test->item)) == NULL) {
+		warnx("ASN1_item_d2i failed");
+		goto err;
+	}
+
+	if ((ret = ASN1_STRING_to_UTF8(&out, str)) != test->want_len) {
+		warnx("ASN1_STRING_to_UTF8 failed: got %d, want %d", ret,
+		    test->want_len);
+		goto err;
+	}
+
+	if (memcmp(out, test->want, test->want_len) != 0) {
+		warnx("memcmp failed");
+		goto err;
+	}
+
+	failed = 0;
+ err:
+	ASN1_STRING_free(str);
+	free(out);
+
+	return failed;
+}
+
+static int
+asn1_string_to_utf8_tests(void)
+{
+	size_t i;
+	int failed = 0;
+
+	for (i = 0; i < N_TESTS; i++)
+		failed |= asn1_string_to_utf8_test(&tests[i]);
+
+	return failed;
+}
+
+int
+main(void)
+{
+	int failed = 0;
+
+	failed |= asn1_string_to_utf8_tests();
+
+	return failed;
+}
-- 
2.20.1