Fix CA date formatting for legacy OpenSSL

Author: Dexus

dist/index.js

@@ -344,7 +344,7 @@ function normalizeDate(value) {
   }
 
   if (typeof value === 'string') {
-    if (/^\d{14}Z$/.test(value)) {
+    if (/^\d{12}Z$/.test(value) || /^\d{14}Z$/.test(value)) {
       return parseAsn1Date(value)
     }
     const date = new Date(value)
@@ -358,30 +358,51 @@ function normalizeDate(value) {
 }
 
 function formatAsn1Date(date) {
-  const pad = (num, size) => {
+  const pad = (num) => {
     let s = String(num)
-    while (s.length < size) {
+    while (s.length < 2) {
       s = '0' + s
     }
     return s
   }
 
-  return date.getUTCFullYear().toString() +
-    pad(date.getUTCMonth() + 1, 2) +
-    pad(date.getUTCDate(), 2) +
-    pad(date.getUTCHours(), 2) +
-    pad(date.getUTCMinutes(), 2) +
-    pad(date.getUTCSeconds(), 2) +
-    'Z'
+  const timePortion = pad(date.getUTCMonth() + 1) +
+    pad(date.getUTCDate()) +
+    pad(date.getUTCHours()) +
+    pad(date.getUTCMinutes()) +
+    pad(date.getUTCSeconds())
+
+  const year = date.getUTCFullYear()
+  if (year >= 1950 && year <= 2049) {
+    return pad(year % 100) + timePortion + 'Z'
+  }
+
+  return year.toString() + timePortion + 'Z'
 }
 
 function parseAsn1Date(value) {
-  const year = Number(value.slice(0, 4))
-  const month = Number(value.slice(4, 6)) - 1
-  const day = Number(value.slice(6, 8))
-  const hour = Number(value.slice(8, 10))
-  const minute = Number(value.slice(10, 12))
-  const second = Number(value.slice(12, 14))
+  const normalized = value.replace(/\s+/g, '')
+  if (!/^\d{12}Z$/.test(normalized) && !/^\d{14}Z$/.test(normalized)) {
+    throw new Error('Invalid ASN.1 date value')
+  }
+
+  let offset
+  let year
+
+  if (normalized.length === 13) { // YYMMDDHHMMSSZ
+    const twoDigit = Number(normalized.slice(0, 2))
+    year = twoDigit >= 50 ? 1900 + twoDigit : 2000 + twoDigit
+    offset = 2
+  } else { // YYYYMMDDHHMMSSZ
+    year = Number(normalized.slice(0, 4))
+    offset = 4
+  }
+
+  const month = Number(normalized.slice(offset, offset + 2)) - 1
+  const day = Number(normalized.slice(offset + 2, offset + 4))
+  const hour = Number(normalized.slice(offset + 4, offset + 6))
+  const minute = Number(normalized.slice(offset + 6, offset + 8))
+  const second = Number(normalized.slice(offset + 8, offset + 10))
   const date = new Date(Date.UTC(year, month, day, hour, minute, second))
   if (Number.isNaN(date.getTime())) {
     throw new Error('Invalid ASN.1 date value')