diff -r e39de9b8b3a1 -r d9cc2d356cdb src/lib/BasicASN1Reader.h
--- a/src/lib/BasicASN1Reader.h	Sun Jul 04 11:37:27 2021 +0200
+++ b/src/lib/BasicASN1Reader.h	Sun Jul 04 11:51:13 2021 +0200
@@ -139,39 +139,39 @@
 			level.push_back({typeHeader.definiteLength, typeHeader.length, getBytesRead()}); // TODO: transaction
 			handlers.writeCollectionStart(typeHeader);
 		} else if (typeHeader.tag == UniversalType::Null && typeHeader.length == 0) {
-			handlers.writeNull();
+			handlers.writeNull(typeHeader);
 		} else if (typeHeader.tag == UniversalType::Boolean && typeHeader.definiteLength && typeHeader.length == 1) {
 			bool value;
 			read((uint8_t*) & value, 1);
-			handlers.writeBoolean(value);
+			handlers.writeBoolean(typeHeader, value);
 		} else if (typeHeader.tag == UniversalType::Integer && typeHeader.tagClass == TagClass::Universal && typeHeader.definiteLength) {
 			// TODO: check available bytes before allocating buffer
 			std::vector<uint8_t> value(typeHeader.length, 0x00);
 			read(value.data(), typeHeader.length);
-			handlers.writeInteger(ASN1ContentHandler::Integer(value));
+			handlers.writeInteger(typeHeader, ASN1ContentHandler::Integer(value));
 		} else if (typeHeader.tag == UniversalType::ObjectIdentifier && typeHeader.tagClass == TagClass::Universal && typeHeader.definiteLength) {
 			std::vector<uint8_t> value(typeHeader.length, 0x00);
 			read(value.data(), typeHeader.length);
-			handlers.writeOID({value});
+			handlers.writeOID(typeHeader,{value});
 		} else if (typeHeader.tag == UniversalType::UTF8String && typeHeader.tagClass == TagClass::Universal && typeHeader.definiteLength) {
 			// TODO: check available bytes before allocating buffer
 			std::string s;
 			s.resize(typeHeader.length);
 			read((uint8_t*) s.data(), typeHeader.length);
-			handlers.writeTextString(ASN1ContentHandler::StringType::UTF8String, s);
+			handlers.writeTextString(typeHeader, s);
 		} else if (typeHeader.tag == UniversalType::PrintableString && typeHeader.tagClass == TagClass::Universal && typeHeader.definiteLength) {
 			// TODO: check encoding
 			// TODO: check available bytes before allocating buffer
 			std::string s;
 			s.resize(typeHeader.length);
 			read((uint8_t*) s.data(), typeHeader.length);
-			handlers.writeTextString(ASN1ContentHandler::StringType::PrintableString, s);
+			handlers.writeTextString(typeHeader, s);
 		} else if (typeHeader.tag == UniversalType::OctetString && typeHeader.tagClass == TagClass::Universal && typeHeader.definiteLength) {
 			// TODO: check available bytes before allocating buffer
 			std::string s;
 			s.resize(typeHeader.length);
 			read((uint8_t*) s.data(), typeHeader.length);
-			handlers.writeOctetString(s);
+			handlers.writeOctetString(typeHeader, s);
 		} else if (typeHeader.tag == UniversalType::BitString && typeHeader.tagClass == TagClass::Universal && typeHeader.definiteLength) {
 			// TODO: check available bytes before allocating buffer
 			std::string s;
@@ -184,7 +184,7 @@
 				for (uint8_t j = padding; j < 8; j++) bits.push_back(s.back() & 1 << j);
 				for (size_t i = s.size() - 2; i > 0; i--) for (uint8_t j = 0; j < 8; j++) bits.push_back(s[i] & 1 << j);
 			}
-			handlers.writeBitString(bits);
+			handlers.writeBitString(typeHeader, bits);
 		} else if (typeHeader.tag == UniversalType::UTCTime && typeHeader.tagClass == TagClass::Universal && typeHeader.definiteLength) {
 			// TODO: check available bytes before allocating buffer
 			// TODO: check encoding
@@ -216,7 +216,7 @@
 					dateTime.timezoneHour = std::stoi(match[i++]);
 					dateTime.timezoneMinute = std::stoi(match[i++]);
 				}
-				handlers.writeDateTime(ASN1ContentHandler::DateTimeType::UTCTime, dateTime);
+				handlers.writeDateTime(typeHeader, dateTime);
 			} else {
 				throw std::invalid_argument("Unsupported UTCTime format: " + s); // TODO: better exception
 			}
@@ -247,7 +247,7 @@
 					dateTime.timezoneHour = std::stoi(match[i++]);
 					dateTime.timezoneMinute = std::stoi(match[i++]);
 				}
-				handlers.writeDateTime(ASN1ContentHandler::DateTimeType::GeneralizedTime, dateTime);
+				handlers.writeDateTime(typeHeader, dateTime);
 			} else {
 				throw std::invalid_argument("Unsupported GeneralizedTime format: " + s); // TODO: better exception
 			}
@@ -266,7 +266,7 @@
 					<< " length = " << typeHeader.length
 					<< " definite = " << (typeHeader.definiteLength ? "true" : "false");
 
-			handlers.writeTextString(ASN1ContentHandler::StringType::UTF8String, description.str());
+			handlers.writeTextString(typeHeader, description.str());
 		}
 
 		commit();