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+#ifndef HEADER_CURL_X509ASN1_H
+#define HEADER_CURL_X509ASN1_H
+
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2021, Daniel Stenberg, <[email protected]>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at https://curl.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ***************************************************************************/
+
+#include "curl_setup.h"
+
+#if defined(USE_GSKIT) || defined(USE_NSS) || defined(USE_GNUTLS) || \
+    defined(USE_WOLFSSL) || defined(USE_SCHANNEL)
+
+#include "urldata.h"
+
+/*
+ * Constants.
+ */
+
+/* Largest supported ASN.1 structure. */
+#define CURL_ASN1_MAX                   ((size_t) 0x40000)      /* 256K */
+
+/* ASN.1 classes. */
+#define CURL_ASN1_UNIVERSAL             0
+#define CURL_ASN1_APPLICATION           1
+#define CURL_ASN1_CONTEXT_SPECIFIC      2
+#define CURL_ASN1_PRIVATE               3
+
+/* ASN.1 types. */
+#define CURL_ASN1_BOOLEAN               1
+#define CURL_ASN1_INTEGER               2
+#define CURL_ASN1_BIT_STRING            3
+#define CURL_ASN1_OCTET_STRING          4
+#define CURL_ASN1_NULL                  5
+#define CURL_ASN1_OBJECT_IDENTIFIER     6
+#define CURL_ASN1_OBJECT_DESCRIPTOR     7
+#define CURL_ASN1_INSTANCE_OF           8
+#define CURL_ASN1_REAL                  9
+#define CURL_ASN1_ENUMERATED            10
+#define CURL_ASN1_EMBEDDED              11
+#define CURL_ASN1_UTF8_STRING           12
+#define CURL_ASN1_RELATIVE_OID          13
+#define CURL_ASN1_SEQUENCE              16
+#define CURL_ASN1_SET                   17
+#define CURL_ASN1_NUMERIC_STRING        18
+#define CURL_ASN1_PRINTABLE_STRING      19
+#define CURL_ASN1_TELETEX_STRING        20
+#define CURL_ASN1_VIDEOTEX_STRING       21
+#define CURL_ASN1_IA5_STRING            22
+#define CURL_ASN1_UTC_TIME              23
+#define CURL_ASN1_GENERALIZED_TIME      24
+#define CURL_ASN1_GRAPHIC_STRING        25
+#define CURL_ASN1_VISIBLE_STRING        26
+#define CURL_ASN1_GENERAL_STRING        27
+#define CURL_ASN1_UNIVERSAL_STRING      28
+#define CURL_ASN1_CHARACTER_STRING      29
+#define CURL_ASN1_BMP_STRING            30
+
+
+/*
+ * Types.
+ */
+
+/* ASN.1 parsed element. */
+struct Curl_asn1Element {
+  const char *header;         /* Pointer to header byte. */
+  const char *beg;            /* Pointer to element data. */
+  const char *end;            /* Pointer to 1st byte after element. */
+  unsigned char class;        /* ASN.1 element class. */
+  unsigned char tag;          /* ASN.1 element tag. */
+  bool          constructed;  /* Element is constructed. */
+};
+
+
+/* ASN.1 OID table entry. */
+struct Curl_OID {
+  const char *numoid;  /* Dotted-numeric OID. */
+  const char *textoid; /* OID name. */
+};
+
+
+/* X509 certificate: RFC 5280. */
+struct Curl_X509certificate {
+  struct Curl_asn1Element certificate;
+  struct Curl_asn1Element version;
+  struct Curl_asn1Element serialNumber;
+  struct Curl_asn1Element signatureAlgorithm;
+  struct Curl_asn1Element signature;
+  struct Curl_asn1Element issuer;
+  struct Curl_asn1Element notBefore;
+  struct Curl_asn1Element notAfter;
+  struct Curl_asn1Element subject;
+  struct Curl_asn1Element subjectPublicKeyInfo;
+  struct Curl_asn1Element subjectPublicKeyAlgorithm;
+  struct Curl_asn1Element subjectPublicKey;
+  struct Curl_asn1Element issuerUniqueID;
+  struct Curl_asn1Element subjectUniqueID;
+  struct Curl_asn1Element extensions;
+};
+
+/*
+ * Prototypes.
+ */
+
+const char *Curl_getASN1Element(struct Curl_asn1Element *elem,
+                                const char *beg, const char *end);
+const char *Curl_ASN1tostr(struct Curl_asn1Element *elem, int type);
+const char *Curl_DNtostr(struct Curl_asn1Element *dn);
+int Curl_parseX509(struct Curl_X509certificate *cert,
+                   const char *beg, const char *end);
+CURLcode Curl_extract_certinfo(struct Curl_easy *data, int certnum,
+                               const char *beg, const char *end);
+CURLcode Curl_verifyhost(struct Curl_easy *data, struct connectdata *conn,
+                         const char *beg, const char *end);
+#endif /* USE_GSKIT or USE_NSS or USE_GNUTLS or USE_WOLFSSL or USE_SCHANNEL */
+#endif /* HEADER_CURL_X509ASN1_H */