org.bouncycastle.oer.OEROutputStream Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of bcutil-fips Show documentation
Show all versions of bcutil-fips Show documentation
The Bouncy Castle Java APIs for ASN.1 extension and utility APIs used to support bcpkix and bctls with the BC FIPS provider. The APIs may also be used with other providers although if being used in a FIPS context it is the responsibility of the user to ensure that any other providers used are FIPS certified and used appropriately.
The newest version!
package org.bouncycastle.oer;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.math.BigInteger;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.List;
import org.bouncycastle.asn1.ASN1ApplicationSpecific;
import org.bouncycastle.asn1.DERBitString;
import org.bouncycastle.asn1.ASN1Boolean;
import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1Enumerated;
import org.bouncycastle.asn1.DERIA5String;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1Set;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.DERUTF8String;
import org.bouncycastle.asn1.BERTags;
import org.bouncycastle.util.BigIntegers;
import org.bouncycastle.util.Pack;
import org.bouncycastle.util.Strings;
import org.bouncycastle.util.encoders.Hex;
public class OEROutputStream
extends OutputStream
{
static final int APPLICATION = 0x40; // decimal 64
static final int TAGGED = 0x80; // decimal 128 - maybe should deprecate this.
static final int CONTEXT_SPECIFIC = 0x80; // decimal 128
private static final int[] bits = new int[]{1, 2, 4, 8, 16, 32, 64, 128};
private final OutputStream out;
protected PrintWriter debugOutput = null;
public OEROutputStream(OutputStream out)
{
this.out = out;
}
public static int byteLength(long value)
{
long m = 0xFF00000000000000L;
int j = 8;
for (; j > 0 && (value & m) == 0; j--)
{
value <<= 8;
}
return j;
}
public void write(ASN1Encodable encodable, Element oerElement)
throws IOException
{
if (encodable == OEROptional.ABSENT)
{
return;
}
else if (encodable instanceof OEROptional)
{
write(((OEROptional)encodable).get(), oerElement);
return;
}
//oerElement = Element.expandDeferredDefinition(oerElement, );
encodable = encodable.toASN1Primitive();
switch (oerElement.getBaseType())
{
case Supplier:
write(encodable, oerElement.getElementSupplier().build());
break;
case SEQ:
{
ASN1Sequence seq = ASN1Sequence.getInstance(encodable);
// build mask.
int j = 7;
int mask = 0;
//
// Does the extension bit in the preamble need to exist and does it need to be set?
//
boolean extensionDefined = false;
if (oerElement.isExtensionsInDefinition())
{
for (int t = 0; t < oerElement.getChildren().size(); t++)
{
Element e = oerElement.getChildren().get(t);
if (e.getBaseType() == OERDefinition.BaseType.EXTENSION)
{
break; // Can support extensions but doesn't have any defined.
}
if ((e.getBlock() > 0 && t < seq.size()))
{
if (!OEROptional.ABSENT.equals(seq.getObjectAt(t)))
{
// Can support extensions and one or more have been defined.
extensionDefined = true;
break;
}
}
}
if (extensionDefined)
{
mask |= bits[j];
}
j--;
}
//
// Write optional bit mask for block 0.
//
for (int t = 0; t < oerElement.getChildren().size(); t++)
{
Element childOERDescription = oerElement.getChildren().get(t);
if (childOERDescription.getBaseType() == OERDefinition.BaseType.EXTENSION)
{
// We don't encode these, they are marker when the possibility of an extension is indicated but no actual extensions
// are defined as yet.
continue;
}
if (childOERDescription.getBlock() > 0)
{
// We are heading into extensions now so stop here and write out the values
// for block 0.
break;
}
childOERDescription = Element.expandDeferredDefinition(childOERDescription, oerElement);
if (oerElement.getaSwitch() != null)
{
childOERDescription = oerElement.getaSwitch().result(new SwitchIndexer.Asn1SequenceIndexer(seq));
childOERDescription = Element.expandDeferredDefinition(childOERDescription, oerElement);
}
if (j < 0)
{
out.write(mask);
j = 7;
mask = 0;
}
ASN1Encodable asn1EncodableChild = seq.getObjectAt(t);
if (childOERDescription.isExplicit() && asn1EncodableChild instanceof OEROptional)
{
// TODO call stack like definition error.
throw new IllegalStateException("absent sequence element that is required by oer definition");
}
if (!childOERDescription.isExplicit())
{
ASN1Encodable obj = seq.getObjectAt(t);
if (childOERDescription.getDefaultValue() != null)
{
if (obj instanceof OEROptional)
{
if (((OEROptional)obj).isDefined())
{
if (!((OEROptional)obj).get().equals(childOERDescription.getDefaultValue()))
{
mask |= bits[j];
}
}
}
else
{
if (!childOERDescription.getDefaultValue().equals(obj))
{
mask |= bits[j];
}
}
}
else
{
if (asn1EncodableChild != OEROptional.ABSENT)
{
mask |= bits[j];
}
}
j--;
}
}
if (j != 7)
{
out.write(mask);
}
List childElements = oerElement.getChildren();
//
// Write the values for block 0.
//
int t;
for (t = 0; t < childElements.size(); t++)
{
Element childOERElement = oerElement.getChildren().get(t);
if (childOERElement.getBaseType() == OERDefinition.BaseType.EXTENSION)
{
continue;
}
if (childOERElement.getBlock() > 0)
{
break;
}
ASN1Encodable child = seq.getObjectAt(t);
if (childOERElement.getaSwitch() != null)
{
childOERElement = childOERElement.getaSwitch().result(new SwitchIndexer.Asn1SequenceIndexer(seq));
}
if (childOERElement.getDefaultValue() != null)
{
if (childOERElement.getDefaultValue().equals(child))
{
continue;
}
}
write(child, childOERElement);
}
//
// Extensions.
//
if (extensionDefined)
{
// Form presence bitmap 16.4.3
int start = t;
ByteArrayOutputStream presensceList = new ByteArrayOutputStream();
j = 7;
mask = 0;
for (int i = start; i < childElements.size(); i++)
{
if (j < 0)
{
presensceList.write(mask);
j = 7;
mask = 0;
}
if (i < seq.size() && !OEROptional.ABSENT.equals(seq.getObjectAt(i)))
{
mask |= bits[j];
}
j--;
}
if (j != 7)
{
// Write the final set of bits.
presensceList.write(mask);
}
encodeLength(presensceList.size() + 1); // +1 = initial octet
if (j == 7)
{
write(0);
}
else
{
write(j + 1);
}// Initial octet 16.4.2
write(presensceList.toByteArray());
// Open encode the actual values.
for (; t < childElements.size(); t++)
{
// 16.5.2 Extension Addition Groups are not supported.
if (t < seq.size() && !OEROptional.ABSENT.equals(seq.getObjectAt(t)))
{
writePlainType(seq.getObjectAt(t), childElements.get(t));
}
}
}
out.flush();
debugPrint(oerElement.appendLabel(""));
}
break;
case SEQ_OF:
//
// Assume this comes in as a sequence.
//
Enumeration e;
if (encodable instanceof ASN1Set)
{
e = ((ASN1Set)encodable).getObjects();
encodeQuantity(((ASN1Set)encodable).size());
}
else if (encodable instanceof ASN1Sequence)
{
e = ((ASN1Sequence)encodable).getObjects();
encodeQuantity(((ASN1Sequence)encodable).size());
}
else
{
throw new IllegalStateException("encodable at for SEQ_OF is not a container");
}
Element encodingElement = Element.expandDeferredDefinition(oerElement.getFirstChid(), oerElement);
while (e.hasMoreElements())
{
Object o = e.nextElement();
write((ASN1Encodable)o, encodingElement);
}
out.flush();
debugPrint(oerElement.appendLabel(""));
break;
case CHOICE:
{
ASN1Primitive item = encodable.toASN1Primitive();
BitBuilder bb = new BitBuilder();
int tag;
ASN1Primitive valueToWrite = null;
if (item instanceof ASN1TaggedObject)
{
ASN1TaggedObject taggedObject = (ASN1TaggedObject)item;
//
// Tag prefix.
//
bb.writeBit(1).writeBit(0);
// int tagClass = taggedObject.getTagClass();
// bb.writeBit(tagClass & CONTEXT_SPECIFIC)
// .writeBit(tagClass & BERTags.APPLICATION);
tag = taggedObject.getTagNo();
valueToWrite = taggedObject.getObject().toASN1Primitive();
}
else
{
throw new IllegalStateException("only support tagged objects");
}
//
// Encode tag value.
//
// Small tag value encode in remaining bits
if (tag <= 63)
{
bb.writeBits(tag, 6);
}
else
{
// Large tag value variant.
bb.writeBits(0xFF, 6);
// Encode as 7bit bytes where MSB indicated continuing byte.
bb.write7BitBytes(tag);
}
if (debugOutput != null)
{
if (item instanceof ASN1TaggedObject)
{
ASN1TaggedObject taggedObject = (ASN1TaggedObject)item;
if (taggedObject.getObject() instanceof ASN1ApplicationSpecific)
{
debugPrint(oerElement.appendLabel("AS"));
}
else
{
debugPrint(oerElement.appendLabel("CS"));
}
}
}
// Save the header.
bb.writeAndClear(out);
Element val = oerElement.getChildren().get(tag);
val = Element.expandDeferredDefinition(val, oerElement);
if (val.getBlock() > 0)
{
writePlainType(valueToWrite, val);
}
else
{
write(valueToWrite, val);
}
out.flush();
break;
}
case ENUM:
{
BigInteger ordinal;
if (encodable instanceof ASN1Integer)
{
ordinal = ASN1Integer.getInstance(encodable).getValue();
}
else
{
ordinal = ASN1Enumerated.getInstance(encodable).getValue();
}
for (Iterator it = oerElement.getChildren().iterator(); it.hasNext(); )
{
Element child = (Element)it.next();
child = Element.expandDeferredDefinition(child, oerElement);
//
// This by default is canonical OER, see NOTE 1 and NOTE 2, 11.14
// Section 11.4 of T-REC-X.696-201508-I!!PDF-E.pdf
//
if (child.getEnumValue().equals(ordinal))
{
if (ordinal.compareTo(BigInteger.valueOf(127)) > 0)
{
// Note 2 Section 11.4 of T-REC-X.696-201508-I!!PDF-E.pdf
byte[] val = ordinal.toByteArray();
int l = 0x80 | (val.length & 0xFF);
out.write(l);
out.write(val);
}
else
{
out.write(ordinal.intValue() & 0x7F);
}
out.flush();
debugPrint(oerElement.appendLabel(oerElement.rangeExpression()));
return;
}
}
// -DM Hex.toHexString
throw new IllegalArgumentException("enum value " + ordinal + " " + Hex.toHexString(ordinal.toByteArray()) + " no in defined child list");
}
case INT:
{
ASN1Integer integer = ASN1Integer.getInstance(encodable);
// >0 = positive and <0 = negative
int intBytesForRange = oerElement.intBytesForRange();
if (intBytesForRange > 0)
{
//
// For unsigned fixed length 1,2,4,8 byte integers.
//
byte[] encoded = BigIntegers.asUnsignedByteArray(intBytesForRange, integer.getValue());
switch (intBytesForRange)
{
case 1:
case 2:
case 4:
case 8:
out.write(encoded);
break;
default:
throw new IllegalStateException("unknown uint length " + intBytesForRange);
}
}
else if (intBytesForRange < 0)
{
//
// For twos compliment numbers of 1,2,4,8 bytes in encoded length.
//
byte[] encoded;
BigInteger number = integer.getValue();
switch (intBytesForRange)
{
case -1:
encoded = new byte[]{number.byteValueExact()};
break;
case -2:
encoded = Pack.shortToBigEndian(number.shortValueExact());
break;
case -4:
encoded = Pack.intToBigEndian(number.intValueExact());
break;
case -8:
encoded = Pack.longToBigEndian(number.longValueExact());
break;
default:
throw new IllegalStateException("unknown twos compliment length");
}
out.write(encoded);
}
else
{
// Unbounded at one or both ends and needs length encoding.
byte[] encoded;
if (oerElement.isLowerRangeZero())
{
// Since we have already captured the fixed with unsigned ints.
// Everything is assumed unbounded we need to encode a length and write the value.
encoded = BigIntegers.asUnsignedByteArray(integer.getValue());
}
else
{
// Twos complement
encoded = integer.getValue().toByteArray();
}
encodeLength(encoded.length); // Deals with long and short forms.
out.write(encoded);
}
debugPrint(oerElement.appendLabel(oerElement.rangeExpression()));
out.flush();
}
break;
case OCTET_STRING:
{
ASN1OctetString octets = ASN1OctetString.getInstance(encodable);
byte[] bytes = octets.getOctets();
if (oerElement.isFixedLength())
{
out.write(bytes);
}
else
{
encodeLength(bytes.length);
out.write(bytes);
}
debugPrint(oerElement.appendLabel(oerElement.rangeExpression()));
out.flush();
break;
}
case IA5String:
{
DERIA5String iaf = DERIA5String.getInstance(encodable);
byte[] encoded = iaf.getOctets();
//
// IA5Strings can be fixed length because they have a fixed multiplier.
//
if (oerElement.isFixedLength() && oerElement.getUpperBound().intValue() != encoded.length)
{
throw new IOException("IA5String string length does not equal declared fixed length "
+ encoded.length + " " + oerElement.getUpperBound());
}
if (oerElement.isFixedLength())
{
out.write(encoded);
}
else
{
encodeLength(encoded.length);
out.write(encoded);
}
debugPrint(oerElement.appendLabel(""));
out.flush();
break;
}
case UTF8_STRING:
{
DERUTF8String utf8 = DERUTF8String.getInstance(encodable);
byte[] encoded = Strings.toUTF8ByteArray(utf8.getString());
encodeLength(encoded.length);
out.write(encoded);
debugPrint(oerElement.appendLabel(""));
out.flush();
break;
}
case BIT_STRING:
{
DERBitString bitString = DERBitString.getInstance(encodable);
byte[] bytes = bitString.getBytes();
if (oerElement.isFixedLength())
{
out.write(bytes);
debugPrint(oerElement.appendLabel(oerElement.rangeExpression()));
}
else
{
int padBits = bitString.getPadBits();
encodeLength(bytes.length + 1); // 13.3.1
out.write(padBits); // 13.3.2
out.write(bytes); // 13.3.3
debugPrint(oerElement.appendLabel(oerElement.rangeExpression()));
}
out.flush();
}
break;
case NULL:
// Does not encode in OER.
break;
case EXTENSION:
{
ASN1OctetString octets = ASN1OctetString.getInstance(encodable);
byte[] bytes = octets.getOctets();
if (oerElement.isFixedLength())
{
out.write(bytes);
}
else
{
encodeLength(bytes.length);
out.write(bytes);
}
debugPrint(oerElement.appendLabel(oerElement.rangeExpression()));
out.flush();
break;
}
case ENUM_ITEM:
// Used to define options does not encode.
break;
case BOOLEAN:
debugPrint(oerElement.getLabel());
ASN1Boolean asn1Boolean = ASN1Boolean.getInstance(encodable);
if (asn1Boolean.isTrue())
{
out.write(255);
}
else
{
out.write(0);
}
out.flush();
}
}
protected void debugPrint(String what)
{
if (debugOutput != null)
{
StackTraceElement[] callStack = Thread.currentThread().getStackTrace();
int level = -1;
for (int i = 0; i != callStack.length; i++)
{
StackTraceElement ste = callStack[i];
if (ste.getMethodName().equals("debugPrint"))
{
level = 0;
continue;
}
if (ste.getClassName().contains("OERInput"))
{
level++;
}
}
for (; level > 0; level--)
{
debugOutput.append(" ");
}
debugOutput.append(what).append("\n");
debugOutput.flush();
}
}
private void encodeLength(long len)
throws IOException
{
if (len <= 127) // complies with 31.2
{
out.write((int)len); // short form 8.6.3
}
else
{
// Long form,
byte[] value = BigIntegers.asUnsignedByteArray(BigInteger.valueOf(len));
out.write((value.length | 0x80));
out.write(value);
}
}
private void encodeQuantity(long quantity)
throws IOException
{
byte[] quantityEncoded = BigIntegers.asUnsignedByteArray(BigInteger.valueOf(quantity));
out.write(quantityEncoded.length);
out.write(quantityEncoded);
}
public void write(int b)
throws IOException
{
out.write(b);
}
public void writePlainType(ASN1Encodable value, Element e)
throws IOException
{
ByteArrayOutputStream bos = new ByteArrayOutputStream();
OEROutputStream oerOutputStream = new OEROutputStream(bos);
oerOutputStream.write(value, e);
oerOutputStream.flush();
oerOutputStream.close();
encodeLength(bos.size());
write(bos.toByteArray());
}
}