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bndlib: A Swiss Army Knife for OSGi
package aQute.libg.asn1;
import java.io.DataInputStream;
import java.io.EOFException;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintStream;
import java.io.UnsupportedEncodingException;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
public class BER implements Types {
final static DateFormat df = new SimpleDateFormat("yyyyMMddHHmmss\\Z");
final DataInputStream xin;
long position;
public BER(InputStream in) {
this.xin = new DataInputStream(in);
}
public void dump(PrintStream out) throws Exception {
int type = readByte();
long length = readLength();
if (type == -1 || length == -1)
throw new EOFException("Empty file");
dump(out, type, length, "");
}
void dump(PrintStream out, int type, long length, String indent) throws Exception {
int clss = type >> 6;
int nmbr = type & 0x1F;
boolean cnst = (type & 0x20) != 0;
String tag = "[" + nmbr + "]";
if (clss == 0)
tag = TAGS[nmbr];
if (cnst) {
System.err.printf("%5d %s %s %s%n", length, indent, CLASSES[clss], tag);
while (length > 1) {
long atStart = getPosition();
int t2 = read();
long l2 = readLength();
dump(out, t2, l2, indent + " ");
length -= getPosition() - atStart;
}
} else {
assert length < Integer.MAX_VALUE;
assert length >= 0;
byte[] data = new byte[(int) length];
readFully(data);
String summary;
switch (nmbr) {
case BOOLEAN :
assert length == 1;
summary = data[0] != 0 ? "true" : "false";
break;
case INTEGER :
long n = toLong(data);
summary = n + "";
break;
case UTF8_STRING :
case IA5STRING :
case VISIBLE_STRING :
case UNIVERSAL_STRING :
case PRINTABLE_STRING :
case UTCTIME :
summary = new String(data, "UTF-8");
break;
case OBJECT_IDENTIFIER :
summary = readOID(data);
break;
case GENERALIZED_TIME :
case GRAPHIC_STRING :
case GENERAL_STRING :
case CHARACTER_STRING :
case REAL :
case EOC :
case BIT_STRING :
case OCTET_STRING :
case NULL :
case OBJECT_DESCRIPTOR :
case EXTERNAL :
case ENUMERATED :
case EMBEDDED_PDV :
case RELATIVE_OID :
case NUMERIC_STRING :
case T61_STRING :
case VIDEOTEX_STRING :
case BMP_STRING :
default :
StringBuilder sb = new StringBuilder();
for (int i = 0; i < 10 && i < data.length; i++) {
sb.append(Integer.toHexString(data[i]));
}
if (data.length > 10) {
sb.append("...");
}
summary = sb.toString();
break;
}
out.printf("%5d %s %s %s %s\n", length, indent, CLASSES[clss], tag, summary);
}
}
long toLong(byte[] data) {
if (data[0] < 0) {
for (int i = 0; i < data.length; i++)
data[i] = (byte) (0xFF ^ data[i]);
return -(toLong(data) + 1);
}
long n = 0;
for (int i = 0; i < data.length; i++) {
n = n * 256 + data[i];
}
return n;
}
/**
* 8.1.3.3 For the definite form, the length octets shall consist of one or
* more octets, and shall represent the number of octets in the contents
* octets using either the short form (see 8.1.3.4) or the long form (see
* 8.1.3.5) as a sender's option. NOTE – The short form can only be used if
* the number of octets in the contents octets is less than or equal to 127.
* 8.1.3.4 In the short form, the length octets shall consist of a single
* octet in which bit 8 is zero and bits 7 to 1 encode the number of octets
* in the contents octets (which may be zero), as an unsigned binary integer
* with bit 7 as the most significant bit. EXAMPLE L = 38 can be encoded as
* 001001102 8.1.3.5 In the long form, the length octets shall consist of an
* initial octet and one or more subsequent octets. The initial octet shall
* be encoded as follows: a) bit 8 shall be one; b) bits 7 to 1 shall encode
* the number of subsequent octets in the length octets, as an unsigned
* binary integer with bit 7 as the most significant bit; c) the value
* 111111112 shall not be used. ISO/IEC 8825-1:2003 (E) NOTE 1 – This
* restriction is introduced for possible future extension. Bits 8 to 1 of
* the first subsequent octet, followed by bits 8 to 1 of the second
* subsequent octet, followed in turn by bits 8 to 1 of each further octet
* up to and including the last subsequent octet, shall be the encoding of
* an unsigned binary integer equal to the number of octets in the contents
* octets, with bit 8 of the first subsequent octet as the most significant
* bit. EXAMPLE L = 201 can be encoded as: 100000012 110010012 NOTE 2 – In
* the long form, it is a sender's option whether to use more length octets
* than the minimum necessary. 8.1.3.6 For the indefinite form, the length
* octets indicate that the contents octets are terminated by
* end-of-contents octets (see 8.1.5), and shall consist of a single octet.
* 8.1.3.6.1 The single octet shall have bit 8 set to one, and bits 7 to 1
* set to zero. 8.1.3.6.2 If this form of length is used, then
* end-of-contents octets (see 8.1.5) shall be present in the encoding
* following the contents octets. 8.1.4 Contents octets The contents octets
* shall consist of zero, one or more octets, and shall encode the data
* value as specified in subsequent clauses. NOTE – The contents octets
* depend on the type of the data value; subsequent clauses follow the same
* sequence as the definition of types in ASN.1. 8.1.5 End-of-contents
* octets The end-of-contents octets shall be present if the length is
* encoded as specified in 8.1.3.6, otherwise they shall not be present. The
* end-of-contents octets shall consist of two zero octets. NOTE – The
* end-of-contents octets can be considered as the encoding of a value whose
* tag is universal class, whose form is primitive, whose number of the tag
* is zero, and whose contents are absent, thus: End-of-contents Length
* Contents 0016 0016 Absent
*/
private long readLength() throws IOException {
long n = readByte();
if (n > 0) {
// short form
return n;
}
// long form
int count = (int) (n & 0x7F);
if (count == 0) {
// indefinite form
return 0;
}
n = 0;
while (count-- > 0) {
n = n * 256 + read();
}
return n;
}
private int readByte() throws IOException {
position++;
return xin.readByte();
}
private void readFully(byte[] data) throws IOException {
position += data.length;
xin.readFully(data);
}
private long getPosition() {
return position;
}
private int read() throws IOException {
position++;
return xin.read();
}
String readOID(byte[] data) {
StringBuilder sb = new StringBuilder();
sb.append((0xFF & data[0]) / 40);
sb.append(".");
sb.append((0xFF & data[0]) % 40);
int i = 0;
while (++i < data.length) {
int n = 0;
while (data[i] < 0) {
n = n * 128 + (0x7F & data[i]);
i++;
}
n = n * 128 + data[i];
sb.append(".");
sb.append(n);
}
return sb.toString();
}
int getPayloadLength(PDU pdu) throws Exception {
switch (pdu.getTag() & 0x1F) {
case EOC :
return 1;
case BOOLEAN :
return 1;
case INTEGER :
return size(pdu.getInt());
case UTF8_STRING :
String s = pdu.getString();
byte[] encoded = s.getBytes("UTF-8");
return encoded.length;
case IA5STRING :
case VISIBLE_STRING :
case UNIVERSAL_STRING :
case PRINTABLE_STRING :
case GENERALIZED_TIME :
case GRAPHIC_STRING :
case GENERAL_STRING :
case CHARACTER_STRING :
case UTCTIME :
case NUMERIC_STRING : {
String str = pdu.getString();
encoded = str.getBytes("ASCII");
return encoded.length;
}
case OBJECT_IDENTIFIER :
case REAL :
case BIT_STRING :
return pdu.getBytes().length;
case OCTET_STRING :
case NULL :
case OBJECT_DESCRIPTOR :
case EXTERNAL :
case ENUMERATED :
case EMBEDDED_PDV :
case RELATIVE_OID :
case T61_STRING :
case VIDEOTEX_STRING :
case BMP_STRING :
return pdu.getBytes().length;
default :
throw new IllegalArgumentException("Invalid type: " + pdu);
}
}
int size(long value) {
if (value < 128)
return 1;
if (value <= 0xFF)
return 2;
if (value <= 0xFFFF)
return 3;
if (value <= 0xFFFFFF)
return 4;
if (value <= 0xFFFFFFFF)
return 5;
if (value <= 0xFFFFFFFFFFL)
return 6;
if (value <= 0xFFFFFFFFFFFFL)
return 7;
if (value <= 0xFFFFFFFFFFFFFFL)
return 8;
if (value <= 0xFFFFFFFFFFFFFFFFL)
return 9;
throw new IllegalArgumentException("length too long");
}
public void write(OutputStream out, PDU pdu) throws Exception {
byte id = 0;
switch (pdu.getClss()) {
case UNIVERSAL :
id |= 0;
break;
case APPLICATION :
id |= 0x40;
break;
case CONTEXT :
id |= 0x80;
break;
case PRIVATE :
id |= 0xC0;
break;
}
if (pdu.isConstructed())
id |= 0x20;
int tag = pdu.getTag();
if (tag >= 0 && tag < 31) {
id |= tag;
} else {
throw new UnsupportedOperationException("Cant do tags > 30");
}
out.write(id);
int length = getPayloadLength(pdu);
int size = size(length);
if (size == 1) {
out.write(length);
} else {
out.write(size);
while (--size >= 0) {
byte data = (byte) ((length >> (size * 8)) & 0xFF);
out.write(data);
}
}
writePayload(out, pdu);
}
void writePayload(OutputStream out, PDU pdu) throws Exception {
switch (pdu.getTag()) {
case EOC :
out.write(0);
break;
case BOOLEAN :
if (pdu.getBoolean())
out.write(-1);
else
out.write(0);
break;
case ENUMERATED :
case INTEGER : {
long value = pdu.getInt();
int size = size(value);
for (int i = size; i >= 0; i--) {
byte b = (byte) ((value >> (i * 8)) & 0xFF);
out.write(b);
}
}
case BIT_STRING : {
byte bytes[] = pdu.getBytes();
int unused = bytes[0];
assert unused <= 7;
int[] mask = {
0xFF, 0x7F, 0x3F, 0x1F, 0xF, 0x7, 0x3, 0x1
};
bytes[bytes.length - 1] &= (byte) mask[unused];
out.write(bytes);
break;
}
case RELATIVE_OID :
case OBJECT_IDENTIFIER : {
int[] oid = pdu.getOID();
assert oid.length > 2;
assert oid[0] < 4;
assert oid[1] < 40;
byte top = (byte) (oid[0] * 40 + oid[1]);
out.write(top);
for (int i = 2; i < oid.length; i++) {
putOid(out, oid[i]);
}
break;
}
case OCTET_STRING : {
byte bytes[] = pdu.getBytes();
out.write(bytes);
break;
}
case NULL :
break;
case BMP_STRING :
case GRAPHIC_STRING :
case VISIBLE_STRING :
case GENERAL_STRING :
case UNIVERSAL_STRING :
case CHARACTER_STRING :
case NUMERIC_STRING :
case PRINTABLE_STRING :
case VIDEOTEX_STRING :
case T61_STRING :
case REAL :
case EMBEDDED_PDV :
case EXTERNAL :
throw new UnsupportedEncodingException("dont know real, embedded PDV or external");
case UTF8_STRING : {
String s = pdu.getString();
byte[] data = s.getBytes("UTF-8");
out.write(data);
break;
}
case OBJECT_DESCRIPTOR :
case IA5STRING :
String s = pdu.getString();
byte[] data = s.getBytes("ASCII");
out.write(data);
break;
case SEQUENCE :
case SET : {
PDU pdus[] = pdu.getChildren();
for (PDU p : pdus) {
write(out, p);
}
}
case UTCTIME :
case GENERALIZED_TIME :
Date date = pdu.getDate();
synchronized (df) {
String ss = df.format(date);
byte d[] = ss.getBytes("ASCII");
out.write(d);
}
break;
}
}
private void putOid(OutputStream out, int i) throws IOException {
if (i > 127) {
putOid(out, i >> 7);
out.write(0x80 + (i & 0x7F));
} else
out.write(i & 0x7F);
}
}