Add CBS functions for working with BIT STRINGs.
Querying a bit in a BIT STRING is a little finicky. Add some functions
to help with this.
Change-Id: I813b9b6f2d952d61d8717b47bca1344f0ad4b7d1
Reviewed-on: https://boringssl-review.googlesource.com/12800
Reviewed-by: Adam Langley <agl@google.com>
Commit-Queue: Adam Langley <agl@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
diff --git a/include/openssl/bytestring.h b/include/openssl/bytestring.h
index a873956..bab268b 100644
--- a/include/openssl/bytestring.h
+++ b/include/openssl/bytestring.h
@@ -257,6 +257,15 @@
OPENSSL_EXPORT int CBS_get_optional_asn1_bool(CBS *cbs, int *out, unsigned tag,
int default_value);
+/* CBS_is_valid_asn1_bitstring returns one if |cbs| is a valid ASN.1 BIT STRING
+ * and zero otherwise. */
+OPENSSL_EXPORT int CBS_is_valid_asn1_bitstring(const CBS *cbs);
+
+/* CBS_asn1_bitstring_has_bit returns one if |cbs| is a valid ASN.1 BIT STRING
+ * and the specified bit is present and set. Otherwise, it returns zero. |bit|
+ * is indexed starting from zero. */
+OPENSSL_EXPORT int CBS_asn1_bitstring_has_bit(const CBS *cbs, unsigned bit);
+
/* CRYPTO ByteBuilder.
*
