Add ASN1_TIME_diff from OpenSSL.

The symbol is not yet exposed and will show up with tb@'s forthcoming bump

ok tb@ jsing@

2 files changed, 21 insertions, 2 deletions

diff --git a/src/lib/libcrypto/asn1/a_time.c b/src/lib/libcrypto/asn1/a_time.c
index 7a3742fd70..9cb41cf885 100644
--- a/src/lib/libcrypto/asn1/a_time.c
+++ b/src/lib/libcrypto/asn1/a_time.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: a_time.c,v 1.27 2015/10/19 16:32:37 beck Exp $ */
+/* $OpenBSD: a_time.c,v 1.28 2021/10/27 09:50:57 beck Exp $ */
 /* ====================================================================
  * Copyright (c) 1999 The OpenSSL Project.  All rights reserved.
  *
@@ -105,3 +105,17 @@ ASN1_TIME_free(ASN1_TIME *a)
 {
         ASN1_item_free((ASN1_VALUE *)a, &ASN1_TIME_it);
 }
+
+int
+ASN1_TIME_diff(int *pday, int *psec, const ASN1_TIME *from,
+    const ASN1_TIME *to)
+{
+    struct tm tm_from, tm_to;
+
+    if (ASN1_time_parse(from->data, from->length, &tm_from, 0) == -1)
+            return 0;
+    if (ASN1_time_parse(from->data, from->length, &tm_to, 0) == -1)
+            return 0;
+
+    return OPENSSL_gmtime_diff(pday, psec, &tm_from, &tm_to);
+}
diff --git a/src/lib/libcrypto/asn1/asn1.h b/src/lib/libcrypto/asn1/asn1.h
index 76c294ada8..43b038adaa 100644
--- a/src/lib/libcrypto/asn1/asn1.h
+++ b/src/lib/libcrypto/asn1/asn1.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: asn1.h,v 1.54 2020/12/08 15:06:42 tb Exp $ */
+/* $OpenBSD: asn1.h,v 1.55 2021/10/27 09:50:57 beck Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -773,6 +773,11 @@ ASN1_TIME *d2i_ASN1_TIME(ASN1_TIME **a, const unsigned char **in, long len);
 int i2d_ASN1_TIME(ASN1_TIME *a, unsigned char **out);
 extern const ASN1_ITEM ASN1_TIME_it;
 
+#if defined(LIBRESSL_NEW_API)
+int ASN1_TIME_diff(int *pday, int *psec, const ASN1_TIME *from,
+    const ASN1_TIME *to);
+#endif
+
 extern const ASN1_ITEM ASN1_OCTET_STRING_NDEF_it;
 
 ASN1_TIME *ASN1_TIME_set(ASN1_TIME *s, time_t t);