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-
+
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DEREncodedContents: (OFData *)DEREncodedContents
{
void *pool = objc_autoreleasePoolPush();
OFData *bitStringValue;
size_t bitStringLength;
@try {
unsigned char lastByteBits;
unsigned char unusedBits;
size_t count = DEREncodedContents.count;
if (tagClass != OF_ASN1_TAG_CLASS_UNIVERSAL ||
tagNumber != OF_ASN1_TAG_NUMBER_BIT_STRING || constructed)
@throw [OFInvalidArgumentException exception];
if (DEREncodedContents.itemSize != 1 || count == 0)
@throw [OFInvalidFormatException exception];
lastByteBits =
unusedBits =
*(unsigned char *)[DEREncodedContents itemAtIndex: 0];
if (lastByteBits > 7)
if (unusedBits > 7)
@throw [OFInvalidFormatException exception];
/*
* Can't have any bits of the last byte used if we have no byte.
* Can't have any bits of the last byte unused if we have no
* byte.
*/
if (count == 1 && lastByteBits != 0)
if (count == 1 && unusedBits != 0)
@throw [OFInvalidFormatException exception];
if (SIZE_MAX / 8 < count - 1 ||
if (SIZE_MAX / 8 < count - 1)
SIZE_MAX - (count - 1) * 8 < lastByteBits)
if (lastByteBits != 0)
bitStringLength -= (8 - lastByteBits);
if (unusedBits != 0)
bitStringLength -= unusedBits;
} @catch (id e) {
[self release];
@throw e;
}
self = [self initWithBitStringValue: bitStringValue
bitStringLength: bitStringLength];
|
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[super dealloc];
}
- (OFData *)ASN1DERRepresentation
{
size_t bitStringValueCount = [_bitStringValue count];
size_t roundedUpLength = OF_ROUND_UP_POW2(8, _bitStringLength);
unsigned char lastByteBits = _bitStringLength % 8;
unsigned char unusedBits = roundedUpLength - _bitStringLength;
unsigned char header[] = {
OF_ASN1_TAG_NUMBER_BIT_STRING,
bitStringValueCount + 1,
lastByteBits
unusedBits
};
OFMutableData *data;
if (bitStringValueCount + 1 > UINT8_MAX ||
bitStringValueCount != OF_ROUND_UP_POW2(8, _bitStringLength) / 8)
bitStringValueCount != roundedUpLength / 8)
@throw [OFInvalidFormatException exception];
data = [OFMutableData dataWithCapacity: 3 + bitStringValueCount];
data = [OFMutableData
dataWithCapacity: sizeof(header) + bitStringValueCount];
[data addItems: header
count: sizeof(header)];
[data addItems: [_bitStringValue items]
count: bitStringValueCount];
[data makeImmutable];
|