parse static method
Implementation
static ASN1Integer parse(final MutableIterable bytes) {
if (bytes.length < 3) {
throw Exception('Invalid data!');
}
int tag = bytes.first;
if (tag != ASN1Type.integerTag) {
throw Exception('Invalid tag!');
}
bytes.mutate = bytes.skip(1);
final lengthBigInt = ASN1Object.decodeLength(bytes);
int length = lengthBigInt.toInt();
if (length == 0) {
throw Exception('Invalid data');
}
if (bytes.length < length) {
throw Exception('Invalid data');
}
final contentBytes = bytes.take(length);
bytes.mutate = bytes.skip(length);
BigInt value = bytesToBigInt(contentBytes);
if ((contentBytes.first & 0x80) != 0) {
value = value.toSigned(value.bitLength);
}
return ASN1Integer(value);
}