From adfa3aaf604d1e70ed3a636eb3eb9a318994c9a0 Mon Sep 17 00:00:00 2001
From: Zhi Guan <guanzhi1980@gmail.com>
Date: Wed, 11 Jan 2023 14:19:37 +0800
Subject: [PATCH] Add functions for SEQUENCE OF

SEQUENCE SIZE (1..n) OF <type>
Always check that SEQUENCE OF is not empty.
---
 include/gmssl/asn1.h |  2 ++
 src/asn1.c           | 13 +++++++++++++
 2 files changed, 15 insertions(+)

diff --git a/include/gmssl/asn1.h b/include/gmssl/asn1.h
index 212ec334..1cbec66d 100644
--- a/include/gmssl/asn1.h
+++ b/include/gmssl/asn1.h
@@ -250,6 +250,8 @@ int asn1_types_get_count(const uint8_t *d, size_t dlen, int tag, size_t *cnt);
 int asn1_types_get_item_by_index(const uint8_t *d, size_t *dlen, int tag,
 	int index, const uint8_t **item_d, size_t *item_dlen);
 
+int asn1_sequence_of_from_der(const uint8_t **d, size_t *dlen, const uint8_t **in, size_t *inlen);
+
 int asn1_sequence_of_int_to_der(const int *nums, size_t nums_cnt, uint8_t **out, size_t *outlen);
 int asn1_sequence_of_int_from_der(int *nums, size_t *nums_cnt, const uint8_t **in, size_t *inlen);
 int asn1_sequence_of_int_print(FILE *fp, int fmt, int ind, const char *label, const uint8_t *d, size_t dlen);
diff --git a/src/asn1.c b/src/asn1.c
index 2069a9a8..c35ed2ee 100644
--- a/src/asn1.c
+++ b/src/asn1.c
@@ -1437,6 +1437,19 @@ int asn1_object_identifier_equ(const uint32_t *a, size_t a_cnt, const uint32_t *
 	return 0;
 }
 
+int asn1_sequence_of_from_der(const uint8_t **d, size_t *dlen, const uint8_t **in, size_t *inlen)
+{
+	int ret;
+	if ((ret = asn1_sequence_from_der(d, dlen, in, inlen)) != 1) {
+		if (ret < 0) error_print();
+		return ret;
+	}
+	if (!(*d) || !(*dlen)) {
+		error_print();
+		return -1;
+	}
+	return 1;
+}
 
 int asn1_sequence_of_int_to_der(const int *nums, size_t nums_cnt, uint8_t **out, size_t *outlen)
 {