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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 | 1x 1x 1x 1x 6x 6x 6x 6x 6x 1x 6x 6x 6x 6x 6x 1x 6x 6x 1x 6x 1x 6x 6x 1x 6x 1x 1x 5x 1x 4x 2x 2x 2x 5x | import {ASN1Message} from '../../../interfaces/ASN1Message';
import {TagClass} from '../../../interfaces/TagClass';
import {TagUniversal} from '../../../interfaces/TagUniversal';
import {padHexString} from '../../../misc';
export function DEREncode(asn1Message: ASN1Message): string {
const identifierOctetsHexStr = getIdentifierOctet(asn1Message);
const contentOctetHexStr = getContentOctet(asn1Message);
const lengthOctetHexStr = getLengthOctet(contentOctetHexStr.length / 2);
const result =
identifierOctetsHexStr + lengthOctetHexStr + contentOctetHexStr;
return result;
}
export function getIdentifierOctet(m: ASN1Message) {
const tagClassBits = getTagClassBits(m.tagClass);
const isConstructedBit = getConstructedBit(m.isConstructed);
const tagCode = m.tagCode;
const result = padHexString(
(tagClassBits + isConstructedBit + tagCode).toString(16)
);
return result;
}
export function getTagClassBits(tagClass: TagClass) {
switch (tagClass) {
case TagClass.UNIVERSAL:
return 0b0000_0000;
case TagClass.APPLICATION:
return 0b0100_0000;
case TagClass.CONTEXT_SPECIFIC:
return 0b1000_0000;
case TagClass.PRIVATE:
return 0b1100_0000;
}
}
export function getConstructedBit(isConstructed: boolean) {
return isConstructed ? 0b0010_0000 : 0;
}
export function getLengthOctet(contentLength: number) {
Eif (contentLength < 127) {
return padHexString(contentLength.toString(16));
}
const end = padHexString(contentLength.toString(16));
return padHexString((end.length / 2).toString(16)) + end;
}
export function getContentOctet(m: ASN1Message): string {
if (m.tagCode === TagUniversal.BOOLEAN.code) {
Eif (m.value === true) {
return 'ff';
} else if (m.value === false) {
return '00';
}
}
if (m.tagCode === TagUniversal.INTEGER.code) {
return padHexString((m.value as number).toString(16));
}
if (
m.tagCode === TagUniversal.GENERAL_STRING.code ||
m.tagCode === TagUniversal.IA5STRING.code
) {
return Buffer.from(m.value as string, 'utf8').toString('hex');
}
Eif (m.tagCode === TagUniversal.SEQUENCE.code) {
const array = m.value as ASN1Message[];
return array.map(msg => DEREncode(msg)).join('');
}
return '';
}
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