<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">RFC 2743 shows this structure:<div class=""><pre class="newpage"> MechType ::= OBJECT IDENTIFIER
-- data structure definitions
-- callers must be able to distinguish among
-- InitialContextToken, SubsequentContextToken,
-- PerMsgToken, and SealedMessage data elements
-- based on the usage in which they occur
InitialContextToken ::=
-- option indication (delegation, etc.) indicated within
-- mechanism-specific token
[APPLICATION 0] IMPLICIT SEQUENCE {
thisMech MechType,
innerContextToken ANY DEFINED BY thisMech
-- contents mechanism-specific
-- ASN.1 structure not required
}</pre><div class="">The encoded data that you provided dies begin with the [APPLICATION 0] tag, then it if followed by by the { 1 3 6 1 5 5 2 } object identifier.</div><div class=""><br class=""></div><div class="">Russ</div><div><br class=""><blockquote type="cite" class=""><div class="">On Nov 4, 2021, at 9:58 AM, Max Larsson <<a href="mailto:max.larsson@facilityboss.biz" class="">max.larsson@facilityboss.biz</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="WordSection1" style="page: WordSection1; caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="DE" class="">Hi everyone,<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="DE" class=""><o:p class=""> </o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" class="">I’m trying to decode and encode Der structure. In my case that are DER encoded GSSAPI structure.<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" class=""><o:p class=""> </o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" class="">My DER encoded data looks like this (stripped the pending bytes):<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" class=""><o:p class=""> </o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif; line-height: 13.5pt; background-color: white;" class=""><span lang="DE" style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class="">0</span><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class="">x60</span><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class=""><span class="Apple-converted-space"> </span><span lang="DE" class="">0</span></span><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class="">x7e</span><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class=""><span class="Apple-converted-space"> </span><span lang="DE" class="">0</span></span><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class="">x06</span><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class=""><span class="Apple-converted-space"> </span><span lang="DE" class="">0</span></span><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class="">x06</span><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class=""><span class="Apple-converted-space"> </span><span lang="DE" class="">0</span></span><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class="">x</span><span lang="DE" style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class="">2</span><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class="">b</span><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class=""><span class="Apple-converted-space"> </span><span lang="DE" class="">0</span></span><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class="">x06</span><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class=""><span class="Apple-converted-space"> </span><span lang="DE" class="">0</span></span><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class="">x01</span><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class=""><span class="Apple-converted-space"> </span><span lang="DE" class="">0</span></span><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class="">x05</span><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class=""><span class="Apple-converted-space"> </span><span lang="DE" class="">0</span></span><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class="">x05</span><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class=""><span class="Apple-converted-space"> </span><span lang="DE" class="">0</span></span><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class="">x02</span><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class=""><span class="Apple-converted-space"> </span><span lang="DE" class="">0</span></span><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class="">xa0</span><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class=""><span class="Apple-converted-space"> </span><span lang="DE" class="">0</span></span><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class="">x74</span><span style="font-size: 9pt; font-family: Menlo;" class=""><o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" class="">My ANS1 definition in my source look like this:<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" class=""><o:p class=""> </o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif; line-height: 13.5pt; background-color: white;" class=""><span style="font-size: 9pt; font-family: Menlo; color: blue;" class="">typedef</span><span style="font-size: 9pt; font-family: Menlo;" class=""><span class="Apple-converted-space"> </span></span><span style="font-size: 9pt; font-family: Menlo; color: blue;" class="">struct</span><span style="font-size: 9pt; font-family: Menlo;" class=""><span class="Apple-converted-space"> </span>ContextToken_st {<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif; line-height: 13.5pt; background-color: white;" class=""><span style="font-size: 9pt; font-family: Menlo;" class=""> ASN1_OBJECT *mech;<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif; line-height: 13.5pt; background-color: white;" class=""><span style="font-size: 9pt; font-family: Menlo;" class=""> ASN1_OCTET_STRING *innerContextToken;<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif; line-height: 13.5pt; background-color: white;" class=""><span style="font-size: 9pt; font-family: Menlo;" class="">} GSSAPI_CONTEXTTOKEN;<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif; line-height: 13.5pt; background-color: white;" class=""><span style="font-size: 9pt; font-family: Menlo;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif; line-height: 13.5pt; background-color: white;" class=""><span style="font-size: 9pt; font-family: Menlo;" class="">DECLARE_ASN1_FUNCTIONS( GSSAPI_CONTEXTTOKEN )<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif; line-height: 13.5pt; background-color: white;" class=""><span style="font-size: 9pt; font-family: Menlo;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif; line-height: 13.5pt; background-color: white;" class=""><span style="font-size: 9pt; font-family: Menlo;" class="">ASN1_SEQUENCE( GSSAPI_CONTEXTTOKEN ) = {<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif; line-height: 13.5pt; background-color: white;" class=""><span style="font-size: 9pt; font-family: Menlo;" class=""> ASN1_SIMPLE( GSSAPI_CONTEXTTOKEN, mech, ASN1_OBJECT ),<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif; line-height: 13.5pt; background-color: white;" class=""><span style="font-size: 9pt; font-family: Menlo;" class=""> ASN1_SIMPLE( GSSAPI_CONTEXTTOKEN, innerContextToken, ASN1_OCTET_STRING )<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif; line-height: 13.5pt; background-color: white;" class=""><span style="font-size: 9pt; font-family: Menlo;" class="">} ASN1_SEQUENCE_END( GSSAPI_CONTEXTTOKEN ) <o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif; line-height: 13.5pt; background-color: white;" class=""><span style="font-size: 9pt; font-family: Menlo;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif; line-height: 13.5pt; background-color: white;" class=""><span style="font-size: 9pt; font-family: Menlo;" class="">IMPLEMENT_ASN1_FUNCTIONS( GSSAPI_CONTEXTTOKEN )<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" class="">Parsing the above DER data fails, so I decided to encode a own Der structure, to see where the difference is with my setup:<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" class=""><o:p class=""> </o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif; line-height: 13.5pt; background-color: white;" class=""><span lang="EN-US" style="font-size: 9pt; font-family: Menlo;" class=""> <span class="Apple-converted-space"> </span></span><span lang="DE" style="font-size: 9pt; font-family: Menlo;" class="">. . .<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif; line-height: 13.5pt; background-color: white;" class=""><span lang="EN-US" style="font-size: 9pt; font-family: Menlo;" class=""> </span><span style="font-size: 9pt; font-family: Menlo;" class="">negToken = GSSAPI_CONTEXTTOKEN_new();<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif; line-height: 13.5pt; background-color: white;" class=""><span style="font-size: 9pt; font-family: Menlo;" class=""> <span class="Apple-converted-space"> </span></span><span style="font-size: 9pt; font-family: Menlo; color: blue;" class="">if</span><span style="font-size: 9pt; font-family: Menlo;" class="">( negToken !=<span class="Apple-converted-space"> </span></span><span style="font-size: 9pt; font-family: Menlo; color: blue;" class="">NULL</span><span style="font-size: 9pt; font-family: Menlo;" class=""><span class="Apple-converted-space"> </span>) {<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif; line-height: 13.5pt; background-color: white;" class=""><span style="font-size: 9pt; font-family: Menlo;" class=""> negToken->mech = OBJ_txt2obj(<span class="Apple-converted-space"> </span></span><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class="">"1.3.6.1.5.5.2"</span><span style="font-size: 9pt; font-family: Menlo;" class="">,</span><span style="font-size: 9pt; font-family: Menlo; color: rgb(9, 134, 88);" class="">0</span><span style="font-size: 9pt; font-family: Menlo;" class=""><span class="Apple-converted-space"> </span>);<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif; line-height: 13.5pt; background-color: white;" class=""><span style="font-size: 9pt; font-family: Menlo;" class=""> negToken->innerContextToken = ASN1_OCTET_STRING_new();<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif; line-height: 13.5pt; background-color: white;" class=""><span style="font-size: 9pt; font-family: Menlo;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif; line-height: 13.5pt; background-color: white;" class=""><span style="font-size: 9pt; font-family: Menlo;" class=""> <span class="Apple-converted-space"> </span></span><span style="font-size: 9pt; font-family: Menlo; color: blue;" class="">const</span><span style="font-size: 9pt; font-family: Menlo;" class=""><span class="Apple-converted-space"> </span></span><span style="font-size: 9pt; font-family: Menlo; color: blue;" class="">unsigned</span><span style="font-size: 9pt; font-family: Menlo;" class=""><span class="Apple-converted-space"> </span></span><span style="font-size: 9pt; font-family: Menlo; color: blue;" class="">char</span><span style="font-size: 9pt; font-family: Menlo;" class=""><span class="Apple-converted-space"> </span>mechToken</span><span style="font-size: 9pt; font-family: Menlo; color: blue;" class="">[]</span><span style="font-size: 9pt; font-family: Menlo;" class=""><span class="Apple-converted-space"> </span>=<span class="Apple-converted-space"> </span></span><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class="">"\xa0\x74\x30</span><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class=""><span class="Apple-converted-space"> </span><span lang="EN-US" class="">// … stripped for readability<o:p class=""></o:p></span></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif; line-height: 13.5pt; background-color: white;" class=""><span lang="EN-US" style="font-size: 9pt; font-family: Menlo;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif; line-height: 13.5pt; background-color: white;" class=""><span style="font-size: 9pt; font-family: Menlo;" class=""> <span class="Apple-converted-space"> </span></span><span style="font-size: 9pt; font-family: Menlo; color: blue;" class="">const</span><span style="font-size: 9pt; font-family: Menlo;" class=""><span class="Apple-converted-space"> </span></span><span style="font-size: 9pt; font-family: Menlo; color: blue;" class="">size_t</span><span style="font-size: 9pt; font-family: Menlo;" class=""><span class="Apple-converted-space"> </span>mechTokenSize =<span class="Apple-converted-space"> </span></span><span style="font-size: 9pt; font-family: Menlo; color: blue;" class="">sizeof</span><span style="font-size: 9pt; font-family: Menlo;" class="">( mechToken ) -<span class="Apple-converted-space"> </span></span><span style="font-size: 9pt; font-family: Menlo; color: rgb(9, 134, 88);" class="">1</span><span style="font-size: 9pt; font-family: Menlo;" class="">;<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif; line-height: 13.5pt; background-color: white;" class=""><span style="font-size: 9pt; font-family: Menlo;" class=""> printf(<span class="Apple-converted-space"> </span></span><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class="">"Size of inner token: %zu\n"</span><span style="font-size: 9pt; font-family: Menlo;" class="">,mechTokenSize );<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif; line-height: 13.5pt; background-color: white;" class=""><span style="font-size: 9pt; font-family: Menlo;" class=""> ASN1_OCTET_STRING_set( negToken->innerContextToken,mechToken,mechTokenSize );<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif; line-height: 13.5pt; background-color: white;" class=""><span style="font-size: 9pt; font-family: Menlo;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif; line-height: 13.5pt; background-color: white;" class=""><span style="font-size: 9pt; font-family: Menlo;" class=""> buffer =<span class="Apple-converted-space"> </span></span><span style="font-size: 9pt; font-family: Menlo; color: blue;" class="">NULL</span><span style="font-size: 9pt; font-family: Menlo;" class="">;<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif; line-height: 13.5pt; background-color: white;" class=""><span style="font-size: 9pt; font-family: Menlo;" class=""> <span class="Apple-converted-space"> </span></span><span style="font-size: 9pt; font-family: Menlo; color: blue;" class="">size_t</span><span style="font-size: 9pt; font-family: Menlo;" class=""><span class="Apple-converted-space"> </span>bufferSize = i2d_GSSAPI_CONTEXTTOKEN( negToken,</span><span style="font-size: 9pt; font-family: Menlo; color: blue;" class="">NULL</span><span style="font-size: 9pt; font-family: Menlo;" class=""><span class="Apple-converted-space"> </span>);<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif; line-height: 13.5pt; background-color: white;" class=""><span style="font-size: 9pt; font-family: Menlo;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif; line-height: 13.5pt; background-color: white;" class=""><span style="font-size: 9pt; font-family: Menlo;" class=""> printf(<span class="Apple-converted-space"> </span></span><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class="">"Required buffer size for DER encoding of ASN1 structure: %zu\n"</span><span style="font-size: 9pt; font-family: Menlo;" class="">,bufferSize );<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif; line-height: 13.5pt; background-color: white;" class=""><span style="font-size: 9pt; font-family: Menlo;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif; line-height: 13.5pt; background-color: white;" class=""><span style="font-size: 9pt; font-family: Menlo;" class=""> <span class="Apple-converted-space"> </span></span><span style="font-size: 9pt; font-family: Menlo; color: blue;" class="">unsigned</span><span style="font-size: 9pt; font-family: Menlo;" class=""><span class="Apple-converted-space"> </span></span><span style="font-size: 9pt; font-family: Menlo; color: blue;" class="">char</span><span style="font-size: 9pt; font-family: Menlo;" class=""><span class="Apple-converted-space"> </span>*buffer = malloc( bufferSize );<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif; line-height: 13.5pt; background-color: white;" class=""><span style="font-size: 9pt; font-family: Menlo;" class=""> <span class="Apple-converted-space"> </span></span><span style="font-size: 9pt; font-family: Menlo; color: blue;" class="">unsigned</span><span style="font-size: 9pt; font-family: Menlo;" class=""><span class="Apple-converted-space"> </span></span><span style="font-size: 9pt; font-family: Menlo; color: blue;" class="">char</span><span style="font-size: 9pt; font-family: Menlo;" class=""><span class="Apple-converted-space"> </span>*p = buffer;<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif; line-height: 13.5pt; background-color: white;" class=""><span style="font-size: 9pt; font-family: Menlo;" class=""> i2d_GSSAPI_CONTEXTTOKEN( negToken,&p );<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif; line-height: 13.5pt; background-color: white;" class=""><span style="font-size: 9pt; font-family: Menlo;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif; line-height: 13.5pt; background-color: white;" class=""><span style="font-size: 9pt; font-family: Menlo;" class=""> <span class="Apple-converted-space"> </span></span><span style="font-size: 9pt; font-family: Menlo;" class=""> </span><span style="font-size: 9pt; font-family: Menlo;" class=""> </span><span style="font-size: 9pt; font-family: Menlo; color: blue;" class="">for</span><span style="font-size: 9pt; font-family: Menlo;" class="">(<span class="Apple-converted-space"> </span></span><span style="font-size: 9pt; font-family: Menlo; color: blue;" class="">int</span><span style="font-size: 9pt; font-family: Menlo;" class=""><span class="Apple-converted-space"> </span>len =<span class="Apple-converted-space"> </span></span><span style="font-size: 9pt; font-family: Menlo; color: rgb(9, 134, 88);" class="">0</span><span style="font-size: 9pt; font-family: Menlo;" class="">;len < bufferSize;len++ ) {<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif; line-height: 13.5pt; background-color: white;" class=""><span style="font-size: 9pt; font-family: Menlo;" class=""> <span class="Apple-converted-space"> </span></span><span style="font-size: 9pt; font-family: Menlo; color: blue;" class="">if</span><span style="font-size: 9pt; font-family: Menlo;" class="">( ( len %<span class="Apple-converted-space"> </span></span><span style="font-size: 9pt; font-family: Menlo; color: rgb(9, 134, 88);" class="">8</span><span style="font-size: 9pt; font-family: Menlo;" class=""><span class="Apple-converted-space"> </span>) ==<span class="Apple-converted-space"> </span></span><span style="font-size: 9pt; font-family: Menlo; color: rgb(9, 134, 88);" class="">0</span><span style="font-size: 9pt; font-family: Menlo;" class=""><span class="Apple-converted-space"> </span>)<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif; line-height: 13.5pt; background-color: white;" class=""><span style="font-size: 9pt; font-family: Menlo;" class=""> printf(<span class="Apple-converted-space"> </span></span><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class="">" "</span><span style="font-size: 9pt; font-family: Menlo;" class=""><span class="Apple-converted-space"> </span>);<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif; line-height: 13.5pt; background-color: white;" class=""><span style="font-size: 9pt; font-family: Menlo;" class=""> <span class="Apple-converted-space"> </span></span><span style="font-size: 9pt; font-family: Menlo; color: blue;" class="">if</span><span style="font-size: 9pt; font-family: Menlo;" class="">( ( len %<span class="Apple-converted-space"> </span></span><span style="font-size: 9pt; font-family: Menlo; color: rgb(9, 134, 88);" class="">16</span><span style="font-size: 9pt; font-family: Menlo;" class=""><span class="Apple-converted-space"> </span>) ==<span class="Apple-converted-space"> </span></span><span style="font-size: 9pt; font-family: Menlo; color: rgb(9, 134, 88);" class="">0</span><span style="font-size: 9pt; font-family: Menlo;" class=""><span class="Apple-converted-space"> </span>)<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif; line-height: 13.5pt; background-color: white;" class=""><span style="font-size: 9pt; font-family: Menlo;" class=""> printf(<span class="Apple-converted-space"> </span></span><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class="">"\n\t\t"</span><span style="font-size: 9pt; font-family: Menlo;" class=""><span class="Apple-converted-space"> </span>);<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif; line-height: 13.5pt; background-color: white;" class=""><span style="font-size: 9pt; font-family: Menlo;" class=""> printf(<span class="Apple-converted-space"> </span></span><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class="">" 0x%02x"</span><span style="font-size: 9pt; font-family: Menlo;" class="">,(</span><span style="font-size: 9pt; font-family: Menlo; color: blue;" class="">short</span><span style="font-size: 9pt; font-family: Menlo;" class="">)buffer[ len ] );<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif; line-height: 13.5pt; background-color: white;" class=""><span style="font-size: 9pt; font-family: Menlo;" class=""> }<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif; line-height: 13.5pt; background-color: white;" class=""><span style="font-size: 9pt; font-family: Menlo;" class=""> printf(<span class="Apple-converted-space"> </span></span><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class="">"\n"</span><span style="font-size: 9pt; font-family: Menlo;" class=""><span class="Apple-converted-space"> </span>);<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif; line-height: 13.5pt; background-color: white;" class=""><span lang="EN-US" style="font-size: 9pt; font-family: Menlo;" class=""> . . .<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif; line-height: 13.5pt; background-color: white;" class=""><span style="font-size: 9pt; font-family: Menlo;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" class="">The code above output the following DER encoded structure (the difference marled in bold):<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" class=""><o:p class=""> </o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif; line-height: 13.5pt; background-color: white;" class=""><b class=""><span lang="EN-US" style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class="">0</span></b><b class=""><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class="">x</span></b><b class=""><span lang="EN-US" style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class="">3</span></b><b class=""><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class="">0</span></b><b class=""><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class=""><span class="Apple-converted-space"> </span><span lang="EN-US" class="">0</span></span></b><b class=""><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class="">x</span></b><b class=""><span lang="EN-US" style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class="">81 0x80</span></b><span lang="EN-US" style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class=""><span class="Apple-converted-space"> </span>0</span><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class="">x06</span><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class=""><span class="Apple-converted-space"> </span><span lang="EN-US" class="">0</span></span><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class="">x06</span><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class=""><span class="Apple-converted-space"> </span><span lang="EN-US" class="">0</span></span><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class="">x</span><span lang="EN-US" style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class="">2</span><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class="">b</span><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class=""><span class="Apple-converted-space"> </span><span lang="EN-US" class="">0</span></span><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class="">x06</span><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class=""><span class="Apple-converted-space"> </span><span lang="EN-US" class="">0</span></span><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class="">x01</span><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class=""><span class="Apple-converted-space"> </span><span lang="EN-US" class="">0</span></span><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class="">x05</span><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class=""><span class="Apple-converted-space"> </span><span lang="EN-US" class="">0</span></span><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class="">x05</span><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class=""><span class="Apple-converted-space"> </span><span lang="EN-US" class="">0</span></span><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class="">x02</span><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class=""><span class="Apple-converted-space"> </span><b class=""><span lang="EN-US" class="">0x04 0x76</span></b><span lang="EN-US" class=""><span class="Apple-converted-space"> </span>0</span></span><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class="">xa0</span><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class=""><span class="Apple-converted-space"> </span><span lang="EN-US" class="">0</span></span><span style="font-size: 9pt; font-family: Menlo; color: rgb(163, 21, 21);" class="">x74</span><span style="font-size: 9pt; font-family: Menlo;" class=""><o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" class="">The google result, which I found seems to point into the direction to use application tags to encode.<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" class=""><o:p class=""> </o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" class="">But I haven’t found any example or how to how to achieve this with openssl, can anyone give me sone hints?<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" class=""><o:p class=""> </o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" class=""><o:p class=""> </o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" class="">Best regards<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" class=""><o:p class=""> </o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" class="">Max Larsson</span><span lang="EN-US" class=""><o:p class=""></o:p></span></div></div><p style="caret-color: rgb(0, 0, 0); font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Calibri, sans-serif; font-size: 11px;" class="">Mit freundlichen Grüßen<br class="">Best regards</p><p style="caret-color: rgb(0, 0, 0); font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Calibri, sans-serif; font-size: 11px;" class="">Dipl.-Inform. 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