pp-certificate
Version:
A very simple script for encoding and decoding pkcs7/pkcs6/x509 certification in Javascript with node.js and web browser support
931 lines (816 loc) • 31.6 kB
JavaScript
if (typeof require === "function") {var bigInt = require("big-integer");var ByteArray = require('pp-bytearray');var moment = require('moment');}
var asn1 = {};
var der = asn1.der = {};
// class类型
der.CLASS_UNIVERSAL = 0;
der.CLASS_APPLICATION = 1;
der.CLASS_CONTEXT_SPECIFIC = 2;
der.CLASS_PRIVATE = 3;
// type
der.TYPE_PRIMITIVE = 0;
der.TYPE_CONSTRUCTED = 1;
// Universal tag value
der.TAG_VALUE_BOOLEAN = 1;
der.TAG_VALUE_INTEGER = 2;
der.TAG_VALUE_BIT_STRING = 3;
der.TAG_VALUE_OCTET_STRING = 4;
der.TAG_VALUE_NULL = 5;
der.TAG_VALUE_OBJECT_IDENTIFIER = 6;
der.TAG_VALUE_OBJECT_DESCRIPTION = 7;
der.TAG_VALUE_EXTERNAL = 8;
der.TAG_VALUE_REAL = 9;
der.TAG_VALUE_ENUMERATED = 10;
der.TAG_VALUE_EMBEDDED_PDV = 11;
der.TAG_VALUE_UTF8_STRING = 12;
der.TAG_VALUE_SEQUENCE = 16;
der.TAG_VALUE_SET = 17;
der.TAG_VALUE_NUMERIC_STRING = 18;
der.TAG_VALUE_PRINTABLE_STRING = 19;
der.TAG_VALUE_TELETEX_STRING = 20;
der.TAG_VALUE_VIDEO_TEX_STRING = 21;
der.TAG_VALUE_IA5_STRING = 22;
der.TAG_VALUE_UTC_TIME = 23;
der.TAG_VALUE_GENERALIZED_TIME = 24;
der.TAG_VALUE_GRAPHIC_STRING = 25;
der.TAG_VALUE_VISIBLE_STRING = 26;
der.TAG_VALUE_GENERAL_STRING = 27;
der.TAG_VALUE_UNIVERSAL_STRING = 28;
der.TAG_VALUE_CHARACTER_STRING = 29;
der.TAG_VALUE_BMP_STRING = 30;
// Tag type
der.TAG_TYPE_NORMAL = 0;
der.TAG_TYPE_IMPLICIT = 1;
der.TAG_TYPE_EXPLICIT = 2;
der.oid = {};
der.oid.toBytes = function(oid) {
if (typeof oid !== 'string') {
throw "OID toBytes error, the oid is not a string";
}
var av = oid.split('.');
var v = [];
if (av.length < 2) {
throw "OID toBytes error, the oid is not a valid oid:" + oid;
}
v.push(parseInt(av[0]) * 40 + parseInt(av[1]));
for (var i = 2; i < av.length; i++) {
var bi = bigInt(av[i]);
if (bi.gt(127)) {
var ba = bi.toArray(0x80).value;
for (var j = 0; j < ba.length; j++) {
if (j === ba.length - 1) {
v.push(ba[j]);
} else {
v.push(0x80 | ba[j]);
}
}
} else {
v.push(bi.value);
}
}
return v;
};
der.oid.fromBytes = function(bytes) {
if (bytes.length <= 0) return '';
var v = [];
if (bytes[0] <= 39) {
v.push(0);
v.push(bytes[0]);
} else if (bytes[0] <= 79) {
v.push(1);
v.push(bytes[0] - 40);
} else {
v.push(2);
v.push(bytes[0] - 80);
}
var b = [];
for (var i = 1; i < bytes.length; i++) {
b.push(bytes[i] & 0x7f);
if ((bytes[i] & 0x80) === 0) {
v.push(bigInt.fromArray(b, 0x80).toString());
b = [];
}
}
return v.join('.');
};
der.toHex = function(v) {
var h = (v instanceof Array) ? bigInt.fromArray(v, 256).toString(16) : bigInt(v).toString(16);
return h.length%2 === 0 ? h : '0' + h;
}
der.updateUtcTime = function(primitive) {
if (primitive instanceof der.Primitive && (primitive.tag.value == der.TAG_VALUE_UTC_TIME || primitive.tag.value == der.TAG_VALUE_GENERALIZED_TIME)) {
var year = moment(primitive.value, 'YYYY-MM-DD HH:mm:ss').utc().year();
primitive.tag.value = year >= 1950 && year <= 2049 ? der.TAG_VALUE_UTC_TIME : der.TAG_VALUE_GENERALIZED_TIME;
}
}
der.Tag = (function() {
"use strict";
function Tag(opt) {
var o = typeof opt === 'undefined' ? {} : opt;
var o = typeof o === 'object' ? o : {value:o};
this.class = o.class || der.CLASS_UNIVERSAL;
this.type = o.type || der.TYPE_PRIMITIVE;
this.value = o.value || 0;
this.tagType = o.tagType || der.TAG_TYPE_NORMAL;
this.tagValue = typeof o.tagValue === 'undefined' ? this.value : o.tagValue; // 当类型为implicit和explict时tag的value
}
Tag.prototype.encode = function(baBuf) {
var t = [];
while (true) {
var v = bigInt(this.tagType === der.TAG_TYPE_IMPLICIT ? this.tagValue : this.value).shiftRight((8*t.length)).and(0xff).value;
if (v === 0) {if(t.length === 0){t.push(v);}break;}
t.push(v);
}
t.reverse();
baBuf.appendUint8((this.class << 6) | (this.type << 5) | t[0]);
baBuf.appendBytes(t, 1);
};
Tag.prototype.decode = function(baBuf, start, end) {
end = typeof end === 'undefined' ? baBuf.length : end;
if (end < start) {
throw "Tag decode error, the message buffer is too short";
}
var v = baBuf.getUint8(start);
this.class = (v >> 6) & 3;
this.type = (v >> 5) & 1;
this.tagValue = v & 0x1f;
if (this.tagValue === 0x1f) {
// 多个八位组
var b = bigInt(this.tagValue);
for (var i = start + 1; i < end; i++) {
var tv = baBuf.getUint8(i);
b.or(bigInt(tv).shiftLeft(8*(i-start)));
if ((tv & 0x80) === 0) break;
}
this.tagValue = b.toString();
if (this.tagType != der.TAG_TYPE_IMPLICIT) this.value = this.tagValue;
return Math.ceil(b.bitLength().value/8);
}
if (this.tagType != der.TAG_TYPE_IMPLICIT) this.value = this.tagValue;
return Uint8Array.BYTES_PER_ELEMENT;
};
Tag.prototype.fromJson = function(tag) {
var o = tag || {};
this.class = o.class || der.CLASS_UNIVERSAL;
this.type = o.type || der.TYPE_PRIMITIVE;
this.value = o.value || 0;
};
Tag.prototype.toJson = function() {
return {class: this.class, type: this.type, value: this.value};
};
return Tag;
})();
der.Length = (function() {
"use strict";
function Length(len) {
this.len = len || 0;
}
Length.prototype.encode = function(baBuf) {
var b = bigInt(this.len);
// 不定长度
if (b.lt(0)) {
baBuf.appendUint8(0x80);
} else if (b.leq(127)) {
baBuf.appendUint8(this.len);
} else {
var v = bigInt(this.len).toArray(256).value;
baBuf.appendUint8(0x80 | v.length);
baBuf.appendBytes(v);
}
};
Length.prototype.decode = function(baBuf, start, end) {
end = typeof end === 'undefined' ? baBuf.length : end;
if (end < start) {
throw "Length decode error, the message buffer is too short";
}
var v = baBuf.getUint8(start);
if (v === 0x80) {
// TODO:
this.len = -1;
} else if ((v & 0x80) === 0) {
this.len = v & 0x7f;
} else {
var l = v & 0x7f;
if (end < start + 1 + l) {
throw "Length decode error, the message buffer is too short";
}
var b = baBuf.getBytes(start + 1, l);
this.len = bigInt.fromArray(b, 256).value;
return l + Uint8Array.BYTES_PER_ELEMENT;
}
return Uint8Array.BYTES_PER_ELEMENT;
};
return Length;
})();
der.Primitive = (function() {
"use strict";
function Primitive(opt) {
var o = opt || {};
this.tag = new der.Tag(o.tag);
this.value = typeof o.value === 'undefined' ? 0 : o.value;
this.padding = typeof o.padding === 'undefined' ? 0 : o.padding;
this.optional = typeof o.optional === 'undefined' ? false : o.optional;
this.present = typeof o.present === 'undefined' ? true : o.present;
this.bits = o.bits || 0;
this.explicitTag = o.explicitTag;
}
Primitive.prototype.encode = function(baBuf) {
if (!this.present) return;
var baMsg = this.tag.tagType === der.TAG_TYPE_EXPLICIT ? new ByteArray() : baBuf;
// tag编码
this.tag.encode(baMsg);
switch (this.tag.value) {
case der.TAG_VALUE_NULL: // 如果是NULL，则只编码长度
baMsg.appendUint8(0);
break;
case der.TAG_VALUE_BOOLEAN:
baMsg.appendUint8(1);
baMsg.appendUint8(this.value ? 0xff : 0);
break;
case der.TAG_VALUE_REAL:
throw "Primitive encode error, un-suport tag value 'real'";
//break;
case der.TAG_VALUE_BIT_STRING: {
if (this.value == 0) {
baMsg.appendUint8(1);
baMsg.appendUint8(0);
} else {
var b = bigInt(this.value);
var bs = b.toString(2);
var pl = 8 - bs.length%8; // padding length
pl = this.padding === -1 || this.padding > pl ? pl : this.padding;
var v = b.shiftLeft(pl).toArray(256).value;
// bits长度
var bn = this.bits > v.length ? this.bits - v.length : 0;
// 长度编码
new der.Length(v.length + 1 + bn).encode(baMsg);
// padding编码
baMsg.appendUint8(pl);
// 值编码
for (var i = 0; i < bn; i++) baMsg.appendUint8(0);
baMsg.appendBytes(v);
}
break;
}
case der.TAG_VALUE_OBJECT_IDENTIFIER: {
var v = der.oid.toBytes(this.value);
// 长度编码
new der.Length(v.length).encode(baMsg);
// 值编码
baMsg.appendBytes(v);
break;
}
case der.TAG_VALUE_IA5_STRING: // ascii字符（IA5String类型的编码对象是ASCII集合中的大多数．包括NULL,BEL,TAB,NL,LF,CR以及32~126）
case der.TAG_VALUE_PRINTABLE_STRING: { // 可打印字符串对象是ASCII集合的一个有限子集，这个子集包括32,39,40~41,43~58,61,63以及65~122.
if (typeof this.value !== 'string') {
throw "Primitive encode error, the value is not a string";
}
var v = this.value.split('').map(function(c) {return c.charCodeAt();});
// 长度编码
new der.Length(v.length).encode(baMsg);
// 值编码
baMsg.appendBytes(v);
break;
}
case der.TAG_VALUE_INTEGER:
case der.TAG_VALUE_ENUMERATED: {
var b = bigInt(this.value);
if (b.lt(0)) {
throw "Primitive-integer encode error, un-suport negative value";
} else {
var v = b.toArray(256).value;
if ((v[0] & 0x80) === 0x80) {
// 长度
new der.Length(v.length + 1).encode(baMsg);
// 补0
baMsg.appendUint8(0);
} else {
new der.Length(v.length).encode(baMsg);
}
// 值编码
baMsg.appendBytes(v);
}
break;
}
case der.TAG_VALUE_UTF8_STRING: {
var v = ByteArray.toUTF8(this.value);
// 长度编码
new der.Length(v.length).encode(baMsg);
// 值编码
baMsg.appendBytes(v);
break;
}
case der.TAG_VALUE_UTC_TIME: {// 注意1950-2049年的时间用UTCTime，1950年前和2049年后的时间用GeneralizedTime
var v = moment(this.value, 'YYYY-MM-DD HH:mm:ss').utc().format('YYMMDDHHmmss\\Z');
v = v.split('').map(function(c) {return c.charCodeAt();});
// 长度编码
new der.Length(v.length).encode(baMsg);
// 值编码
baMsg.appendBytes(v);
break;
}
case der.TAG_VALUE_GENERALIZED_TIME: {// 注意1950-2049年的时间用UTCTime，1950年前和2049年后的时间用GeneralizedTime
var v = moment(this.value, 'YYYY-MM-DD HH:mm:ss').utc().format('YYYYMMDDHHmmss\\Z');
v = v.split('').map(function(c) {return c.charCodeAt();});
// 长度编码
new der.Length(v.length).encode(baMsg);
// 值编码
baMsg.appendBytes(v);
break;
}
case der.TAG_VALUE_OCTET_STRING: // 可以理解为字节数组
case der.TAG_VALUE_BMP_STRING: // 可以理解为字节数组
default: {
// 长度编码
new der.Length(this.value.length).encode(baMsg);
// 值编码
baMsg.appendBytes(this.value);
break;
}
}
if (this.tag.tagType === der.TAG_TYPE_EXPLICIT) {
var v = baMsg.getBytes();
// explicit tag
this.explicitTag.encode(baBuf);
// Length
new der.Length(v.length).encode(baBuf);
// Value
baBuf.appendBytes(v);
}
};
Primitive.prototype.decode = function(baBuf, start, end) {
end = typeof end === 'undefined' ? baBuf.length : end;
start = start || 0;
var etaglen = 0;
if (this.tag.tagType === der.TAG_TYPE_EXPLICIT) {
var istart = start;
start += this.explicitTag.decode(baBuf, start, end);
start += new der.Length().decode(baBuf, start, end);
etaglen = start - istart;
}
// tag解码
var tl = this.tag.decode(baBuf, start, end);
// length解码
var len = new der.Length();
var ll = len.decode(baBuf, start + tl, end);
var mlen = tl + ll + len.len;
if (end < start + mlen) {
throw "Primitive decode error, the message buffer is too short";
}
// value解码
var b = baBuf.getBytes(start + tl + ll, len.len);
switch (this.tag.value) {
case der.TAG_VALUE_NULL:
this.value = 0;
break;
case der.TAG_VALUE_BOOLEAN:
this.value = bigInt.fromArray(b, 256).toString() === '0' ? false : true;
break;
case der.TAG_VALUE_REAL:
throw "Primitive decode error, un-suport tag value 'real'";
case der.TAG_VALUE_BIT_STRING: {
if (b.length <= 0 || (b.length === 1 && b[0] === 0)) {
this.value = 0;
} else {
var pl = b[0];
this.value = bigInt.fromArray(b.slice(1), 256).shiftRight(pl).toString();
this.bits = b.length - 1;
}
break;
}
case der.TAG_VALUE_OBJECT_IDENTIFIER: {
this.value = der.oid.fromBytes(b);
break;
}
case der.TAG_VALUE_IA5_STRING: // ascii字符（IA5String类型的编码对象是ASCII集合中的大多数．包括NULL,BEL,TAB,NL,LF,CR以及32~126）
case der.TAG_VALUE_PRINTABLE_STRING: { // 可打印字符串对象是ASCII集合的一个有限子集，这个子集包括32,39,40~41,43~58,61,63以及65~122.
this.value = b.map(function(c) {return String.fromCharCode(c);}).join('');
break;
}
case der.TAG_VALUE_INTEGER:
case der.TAG_VALUE_ENUMERATED: {
if (b.length <= 0) {
this.value = 0;
break;
}
if ((b[0] & 0x80) !== 0) {
throw "Primitive-integer decode error, un-suport negative value";
}
this.value = bigInt.fromArray(b, 256).toString();
break;
}
case der.TAG_VALUE_UTF8_STRING: {
this.value = ByteArray.fromUTF8(b);
break;
}
case der.TAG_VALUE_UTC_TIME: {
var v = b.map(function(c) {return String.fromCharCode(c);}).join('');
v = v >= '50' ? '19' + v : '20' + v;
this.value = moment.utc(v, 'YYYYMMDDHHmmss\\Z').local().format('YYYY-MM-DD HH:mm:ss');
break;
}
case der.TAG_VALUE_GENERALIZED_TIME: {
var v = b.map(function(c) {return String.fromCharCode(c);}).join('');
this.value = moment.utc(v, 'YYYYMMDDHHmmss\\Z').local().format('YYYY-MM-DD HH:mm:ss');
break;
}
case der.TAG_VALUE_OCTET_STRING: // 可以理解为字节数组
case der.TAG_VALUE_BMP_STRING: // 可以理解为字节数组
default:
this.value = b;
break;
}
return mlen + etaglen;
};
Primitive.prototype.fromJson = function(bi) {
var o = bi || {};
this.tag.fromJson(o.tag);
this.value = typeof o.value === 'undefined' ? 0 : o.value;
};
Primitive.prototype.toJson = function() {
return {tag: this.tag.toJson(), value: this.value, /*hex: bigInt(this.value).toString(16)*/};
};
Primitive.prototype.toBytes = function() {
var ba = new ByteArray();
this.encode(ba);
return ba.getBytes();
};
Primitive.prototype.toString = function(encoding='base64') {
return new Buffer(this.toBytes()).toString(encoding);
};
return Primitive;
})();
der.Sequence = (function() {
"use strict";
function Sequence(opt) {
var o = opt || {};
this.tag = new der.Tag(o.tag || {
class: asn1.der.CLASS_UNIVERSAL,
type: asn1.der.TYPE_CONSTRUCTED,
value: asn1.der.TAG_VALUE_SEQUENCE
});
this.optional = typeof o.optional === 'undefined' ? false : o.optional;
this.present = typeof o.present === 'undefined' ? true : o.present;
this.elements = o.elements || [];
this.explicitTag = o.explicitTag;
}
Sequence.prototype.encode = function(baBuf) {
if (!this.present) return;
var baMsg = this.tag.tagType === der.TAG_TYPE_EXPLICIT ? new ByteArray() : baBuf;
// 子元素编码
var baElm = new ByteArray();
this.elements.forEach(function(element) {
element.encode(baElm);
});
var v = baElm.length > 0 ? baElm.getBytes() : [];
// tag编码
this.tag.encode(baMsg);
// 长度编码
new der.Length(v.length).encode(baMsg);
// 值编码
baMsg.appendBytes(v);
if (this.tag.tagType === der.TAG_TYPE_EXPLICIT) {
var v = baMsg.getBytes();
// explicit tag
this.explicitTag.encode(baBuf);
// Length
new der.Length(v.length).encode(baBuf);
// Value
baBuf.appendBytes(v);
}
};
Sequence.prototype.decode = function(baBuf, start, end) {
end = typeof end === 'undefined' ? baBuf.length : end;
start = start || 0;
var etaglen = 0;
if (this.tag.tagType === der.TAG_TYPE_EXPLICIT) {
var istart = start;
start += this.explicitTag.decode(baBuf, start, end);
start += new der.Length().decode(baBuf, start, end);
etaglen = start - istart;
}
// tag解码
var tl = this.tag.decode(baBuf, start, end);
// length解码
var len = new der.Length();
var ll = len.decode(baBuf, start + tl, end);
var mlen = tl + ll + len.len;
var elmEnd = start + mlen;
if (end < elmEnd) {
throw "Sequence decode error, the message buffer is too short";
}
// elements解码
this.elements = [];
if (len.len <= 0) return mlen + etaglen;
start += tl + ll;
var readLen = 0;
var elmTag = new der.Tag();
while (readLen < len.len) {
// 读子元素tag
elmTag.decode(baBuf, start, elmEnd);
var curElm = elmTag.type === der.TYPE_PRIMITIVE ? new der.Primitive() : new Sequence();
var elmLen = curElm.decode(baBuf, start, elmEnd);
this.elements.push(curElm);
readLen += elmLen;
start += elmLen;
}
return mlen + etaglen;
};
Sequence.prototype.fromJson = function(se) {
var o = se || {};
this.tag.fromJson(se.tag || this.tag);
this.elements = o.elements || [];
};
Sequence.prototype.toJson = function() {
var sequence = [];
this.elements.forEach(function(element) {
sequence.push(element.toJson());
});
return {tag: this.tag.toJson(), sequence};
};
Sequence.prototype.toBytes = function() {
var ba = new ByteArray();
this.encode(ba);
return ba.getBytes();
};
Sequence.prototype.toString = function(encoding='base64') {
return new Buffer(this.toBytes()).toString(encoding);
};
return Sequence;
})();
der.Constructive = (function() {
"use strict";
function Constructive(opt) {
var o = opt || {};
this.tag = new asn1.der.Tag(o.tag || {
class: asn1.der.CLASS_UNIVERSAL,
type: asn1.der.TYPE_CONSTRUCTED,
value: asn1.der.TAG_VALUE_SEQUENCE
});
this.optional = typeof o.optional === 'undefined' ? false : o.optional;
this.present = typeof o.present === 'undefined' ? true : o.present;
this.elements = o.elements || [];
this.explicitTag = o.explicitTag;
}
Constructive.prototype.encodeSubField = function(baBuf) {
this.elements.forEach(function(element) {
element.encode(baBuf);
});
};
Constructive.prototype.encode = function(baBuf) {
if (!this.present) return;
var baMsg = this.tag.tagType === der.TAG_TYPE_EXPLICIT ? new ByteArray() : baBuf;
// 子元素编码
var baElm = new ByteArray();
this.encodeSubField(baElm);
var v = baElm.length > 0 ? baElm.getBytes() : [];
// tag编码
this.tag.encode(baMsg);
// 长度编码
new der.Length(v.length).encode(baMsg);
// 值编码
baMsg.appendBytes(v);
if (this.tag.tagType === der.TAG_TYPE_EXPLICIT) {
var vv = baMsg.getBytes();
// explicit tag
this.explicitTag.encode(baBuf);
// Length
new der.Length(vv.length).encode(baBuf);
// Value
baBuf.appendBytes(vv);
}
};
Constructive.prototype.decodeSubField = function(baBuf, start, end) {
var tag = new der.Tag();
this.elements.forEach(function(element) {
if (element.optional) {
if (start >= end) {
element.present = false;
return;
}
var elmTag = element.tag.tagType === der.TAG_TYPE_EXPLICIT ? element.explicitTag.value : element.tag.tagValue;
tag.decode(baBuf, start, end);
if (tag.value != elmTag) {
element.present = false;
return;
}
}
element.present = true;
start += element.decode(baBuf, start, end);
});
};
Constructive.prototype.decode = function(baBuf, start, end) {
end = typeof end === 'undefined' ? baBuf.length : end;
start = start || 0;
var etaglen = 0;
if (this.tag.tagType === der.TAG_TYPE_EXPLICIT) {
var istart = start;
start += this.explicitTag.decode(baBuf, start, end);
start += new der.Length().decode(baBuf, start, end);
etaglen = start - istart;
}
// tag解码
var tl = this.tag.decode(baBuf, start, end);
// length解码
var len = new der.Length();
var ll = len.decode(baBuf, start + tl, end);
var mlen = tl + ll + len.len;
var elmEnd = start + mlen;
if (end < elmEnd) {
throw "Constructive decode error, the message buffer is too short";
}
// elements解码
start += tl + ll;
// 子元素解码
if (len.len > 0) this.decodeSubField(baBuf, start, elmEnd);
return mlen + etaglen;
};
Constructive.prototype.toBytes = function() {
var ba = new ByteArray();
this.encode(ba);
return ba.getBytes();
};
Constructive.prototype.toString = function(encoding='base64') {
return new Buffer(this.toBytes()).toString(encoding);
};
return Constructive;
})();
der.Set = (function() {
"use strict";
function Set(opt) {
var o = opt || {};
this.sequence = o.sequence || false;
this.tag = new asn1.der.Tag(o.tag || {
class: asn1.der.CLASS_UNIVERSAL,
type: asn1.der.TYPE_CONSTRUCTED,
value: this.sequence ? asn1.der.TAG_VALUE_SEQUENCE : asn1.der.TAG_VALUE_SET
});
this.optional = typeof o.optional === 'undefined' ? false : o.optional;
this.present = typeof o.present === 'undefined' ? true : o.present;
this.elements = o.elements || [];
this.elementCreator = o.elementCreator || function() {return new der.Primitive();}
this.explicitTag = o.explicitTag;
}
Set.prototype.encode = function(baBuf) {
if (!this.present) return;
var baMsg = this.tag.tagType === der.TAG_TYPE_EXPLICIT ? new ByteArray() : baBuf;
if (this.sequence) {
// 子元素编码
this.elements.forEach(function(element) {
element.encode(baMsg);
});
} else {
if (this.tag.tagType === der.TAG_TYPE_IMPLICIT) {
// 子元素编码
var baElm = new ByteArray();
this.elements.forEach(function(element) {
element.encode(baElm);
});
if (baElm.length > 0) {
var v = baElm.getBytes();
// tag编码
this.tag.encode(baMsg);
// 长度编码
new der.Length(v.length).encode(baMsg);
// 值编码
baMsg.appendBytes(v);
}
} else {
// 子元素编码
var baElm = new ByteArray();
var tag = this.tag;
this.elements.forEach(function(element) {
element.encode(baElm);
if (baElm.length > 0) {
var v = baElm.getBytes();
// tag编码
tag.encode(baMsg);
// 长度编码
new der.Length(v.length).encode(baMsg);
// 值编码
baMsg.appendBytes(v);
// 重置
baElm.clear();
}
});
// 没有元素的情况
if ((!this.optional || this.present) && this.elements.length === 0) {
this.tag.encode(baMsg);
new der.Length(0).encode(baMsg);
}
}
}
if (this.tag.tagType === der.TAG_TYPE_EXPLICIT) {
var v = baMsg.getBytes();
// explicit tag
this.explicitTag.encode(baBuf);
// Length
new der.Length(v.length).encode(baBuf);
// Value
baBuf.appendBytes(v);
}
};
Set.prototype.decode = function(baBuf, start, end) {
end = typeof end === 'undefined' ? baBuf.length : end;
start = start || 0;
var etaglen = 0;
if (this.tag.tagType === der.TAG_TYPE_EXPLICIT) {
var istart = start;
start += this.explicitTag.decode(baBuf, start, end);
start += new der.Length().decode(baBuf, start, end);
etaglen = start - istart;
}
this.elements = [];
var mlen = 0;
var tag = new der.Tag();
var len = new der.Length();
if (this.sequence) {
while (start < end) {
// tag解码
var tl = tag.decode(baBuf, start, end);
if (tag.value !== this.tag.tagValue) {
break;
}
var elm = this.elementCreator();
var elen = elm.decode(baBuf, start, end);
this.elements.push(elm);
mlen += elen;
start += elen;
}
} else {
if (this.tag.tagType === der.TAG_TYPE_IMPLICIT) {
// tag解码
var tl = this.tag.decode(baBuf, start, end);
// length解码
var ll = len.decode(baBuf, start + tl, end);
var elen = tl + ll + len.len;
if (end < start + elen) {
throw "Set decode error, the message buffer is too short";
}
// elements解码
start += tl + ll;
mlen += tl + ll;
if (len.len > 0) {
var elmEnd = start + len.len;
while (start < elmEnd) {
var elm = this.elementCreator();
elen = elm.decode(baBuf, start, elmEnd);
this.elements.push(elm);
start += elen;
mlen += elen;
}
}
} else {
while (start < end) {
// tag解码
var tl = tag.decode(baBuf, start, end);
if (tag.value !== this.tag.tagValue) {
break;
}
// length解码
var ll = len.decode(baBuf, start + tl, end);
if (len.len <= 0) {
mlen += tl + ll;
break;
}
var elen = tl + ll + len.len;
if (end < start + elen) {
throw "Set decode error, the message buffer is too short";
}
// elements解码
start += tl + ll;
var elm = this.elementCreator();
start += elm.decode(baBuf, start, end);
this.elements.push(elm);
mlen += elen;
}
}
}
return mlen + etaglen;
};
Set.prototype.toJson = function() {
var o = [];
this.elements.forEach(function(element) {
o.push(element.toJson());
});
return o;
};
Set.prototype.toBytes = function() {
var ba = new ByteArray();
this.encode(ba);
return ba.getBytes();
};
Set.prototype.toString = function(encoding='base64') {
return new Buffer(this.toBytes()).toString(encoding);
};
return Set;
})();
// Node.js check
if (typeof module !== "undefined" && module.hasOwnProperty("exports")) {
module.exports = asn1;
}
// amd check
if (typeof define === "function" && define.amd) {
define("asn-der", [], function() {
return asn1;
});
}