Provide CBB_add_u64()

Prompted by and ok tb@

2 files changed, 21 insertions, 2 deletions

diff --git a/src/lib/libssl/bs_cbb.c b/src/lib/libssl/bs_cbb.c
index e17c57edd6..95e53861f0 100644
--- a/src/lib/libssl/bs_cbb.c
+++ b/src/lib/libssl/bs_cbb.c
@@ -1,4 +1,4 @@
-/*      $OpenBSD: bs_cbb.c,v 1.26 2021/05/16 10:58:27 jsing Exp $       */
+/*      $OpenBSD: bs_cbb.c,v 1.27 2022/01/06 14:30:30 jsing Exp $       */
 /*
  * Copyright (c) 2014, Google Inc.
  *
@@ -414,6 +414,19 @@ CBB_add_u32(CBB *cbb, size_t value)
 }
 
 int
+CBB_add_u64(CBB *cbb, uint64_t value)
+{
+        uint32_t a, b;
+
+        a = value >> 32;
+        b = value & 0xffffffff;
+
+        if (!CBB_add_u32(cbb, a))
+                return 0;
+        return CBB_add_u32(cbb, b);
+}
+
+int
 CBB_add_asn1_uint64(CBB *cbb, uint64_t value)
 {
         CBB child;
diff --git a/src/lib/libssl/bytestring.h b/src/lib/libssl/bytestring.h
index ce933f3f7b..022bc683a3 100644
--- a/src/lib/libssl/bytestring.h
+++ b/src/lib/libssl/bytestring.h
@@ -1,4 +1,4 @@
-/*      $OpenBSD: bytestring.h,v 1.22 2021/12/15 17:36:49 jsing Exp $   */
+/*      $OpenBSD: bytestring.h,v 1.23 2022/01/06 14:30:30 jsing Exp $   */
 /*
  * Copyright (c) 2014, Google Inc.
  *
@@ -509,6 +509,12 @@ int CBB_add_u24(CBB *cbb, size_t value);
 int CBB_add_u32(CBB *cbb, size_t value);
 
 /*
+ * CBB_add_u64 appends a 64-bit, big-endian number from |value| to |cbb|. It
+ * returns one on success and zero otherwise.
+ */
+int CBB_add_u64(CBB *cbb, uint64_t value);
+
+/*
  * CBB_add_asn1_uint64 writes an ASN.1 INTEGER into |cbb| using |CBB_add_asn1|
  * and writes |value| in its contents. It returns one on success and zero on
  * error.