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//
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// MYDEREncoder.m
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// MYCrypto
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//
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// Created by Jens Alfke on 5/29/09.
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// Copyright 2009 Jens Alfke. All rights reserved.
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//
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#import "MYDEREncoder.h"
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#import "MYASN1Object.h"
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#import "MYBERParser.h"
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#import "MYOID.h"
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#import "MYErrorUtils.h"
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#define MYDEREncoderException @"MYDEREncoderException"
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@interface MYDEREncoder ()
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- (void) _encode: (id)object;
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@property (retain) NSError *error;
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@end
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@implementation MYDEREncoder
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- (id) initWithRootObject: (id)rootObject
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{
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self = [super init];
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if (self != nil) {
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_rootObject = [rootObject retain];
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}
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return self;
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}
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+ (NSData*) encodeRootObject: (id)rootObject error: (NSError**)outError {
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MYDEREncoder *encoder = [[self alloc] initWithRootObject: rootObject];
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NSData *output = [encoder.output copy];
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if (outError) *outError = [[encoder.error retain] autorelease];
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[encoder release];
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return [output autorelease];
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}
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- (void) dealloc
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{
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[_rootObject release];
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[_output release];
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[super dealloc];
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}
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static unsigned sizeOfUnsignedInt (UInt64 n) {
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unsigned bytes = 0;
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for (; n; n >>= 8)
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bytes++;
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return bytes;
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}
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static unsigned encodeUnsignedInt (UInt64 n, UInt8 buf[], BOOL padHighBit) {
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unsigned size = MAX(1U, sizeOfUnsignedInt(n));
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UInt64 bigEndian = NSSwapHostLongLongToBig(n);
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const UInt8* src = (UInt8*)&bigEndian + (8-size);
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UInt8 *dst = &buf[0];
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if (padHighBit && (*src & 0x80)) {
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*dst++ = 0;
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size++;
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}
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memcpy(dst, src, size);
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return size;
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}
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static unsigned encodeSignedInt (SInt64 n, UInt8 buf[]) {
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if (n >= 0)
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return encodeUnsignedInt(n, buf, YES);
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else {
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unsigned size = MAX(1U, sizeOfUnsignedInt(~n));
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UInt64 bigEndian = NSSwapHostLongLongToBig(n);
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const UInt8* src = (UInt8*)&bigEndian + (8-size);
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UInt8 *dst = &buf[0];
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if (!(*src & 0x80)) {
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*dst++ = 0xFF;
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size++;
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}
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memcpy(dst, src, size);
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return size;
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}
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}
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- (void) _writeTag: (unsigned)tag
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class: (unsigned)tagClass
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constructed: (BOOL) constructed
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length: (size_t)length
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{
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struct {
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unsigned tag :5;
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unsigned isConstructed :1;
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unsigned tagClass :2;
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unsigned length :7;
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unsigned isLengthLong :1;
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UInt8 extraLength[9];
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} header;
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size_t headerSize = 2;
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header.tag = tag;
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header.isConstructed = constructed;
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header.tagClass = tagClass;
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if (length < 128) {
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header.isLengthLong = NO;
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header.length = length;
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} else {
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header.isLengthLong = YES;
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header.length = encodeUnsignedInt(length, header.extraLength, NO);
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headerSize += header.length;
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}
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[_output appendBytes: &header length: headerSize];
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}
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- (void) _writeTag: (unsigned)tag
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class: (unsigned)tagClass
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constructed: (BOOL) constructed
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bytes: (const void*)bytes
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length: (size_t)length
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{
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[self _writeTag: tag class: tagClass constructed: constructed length: length];
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[_output appendBytes: bytes length: length];
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}
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- (void) _writeTag: (unsigned)tag
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class: (unsigned)tagClass
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constructed: (BOOL) constructed
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data: (NSData*)data
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{
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Assert(data);
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[self _writeTag: tag class: tagClass constructed: constructed bytes: data.bytes length: data.length];
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}
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- (void) _encodeNumber: (NSNumber*)number {
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// Special-case detection of booleans by pointer equality, because otherwise they appear
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// identical to 0 and 1:
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if (number==$true || number==$false) {
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UInt8 value = number==$true ?0xFF :0x00;
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[self _writeTag: 1 class: 0 constructed: NO bytes: &value length: 1];
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return;
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}
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const char *type = number.objCType;
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if (strlen(type) == 1) {
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switch(type[0]) {
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case 'c':
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case 'i':
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case 's':
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case 'l':
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case 'q':
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{ // Signed integers:
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UInt8 buf[9];
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size_t size = encodeSignedInt(number.longLongValue, buf);
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[self _writeTag: 2 class: 0 constructed: NO bytes: buf length: size];
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return;
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}
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case 'C':
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case 'I':
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case 'S':
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case 'L':
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case 'Q':
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{ // Unsigned integers:
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UInt8 buf[9];
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size_t size = encodeUnsignedInt(number.unsignedLongLongValue, buf, YES);
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[self _writeTag: 2 class: 0 constructed: NO bytes: buf length: size];
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return;
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}
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case 'B':
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{ // bool
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UInt8 value = number.boolValue ?0xFF :0x00;
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[self _writeTag: 1 class: 0 constructed: NO bytes: &value length: 1];
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return;
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}
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}
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}
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[NSException raise: MYDEREncoderException format: @"Can't DER-encode value %@ (typecode=%s)", number,type];
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}
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- (void) _encodeString: (NSString*)string {
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NSData *data = [string dataUsingEncoding: NSASCIIStringEncoding];
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if (data)
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[self _writeTag: 19 class: 0 constructed: NO data: data];
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else
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[self _writeTag: 12 class: 0 constructed: NO data: [string dataUsingEncoding: NSUTF8StringEncoding]];
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}
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- (void) _encodeBitString: (MYBitString*)bitString {
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NSUInteger bitCount = bitString.bitCount;
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[self _writeTag: 3 class: 0 constructed: NO length: 1 + (bitCount/8)];
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UInt8 unused = (8 - (bitCount % 8)) % 8;
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[_output appendBytes: &unused length: 1];
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[_output appendBytes: bitString.bits.bytes length: bitCount/8];
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}
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- (void) _encodeDate: (NSDate*)date {
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NSString *dateStr = [MYBERGeneralizedTimeFormatter() stringFromDate: date];
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Log(@"Encoded %@ as '%@'",date,dateStr);//TEMP
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[self _writeTag: 24 class: 0 constructed: NO data: [dateStr dataUsingEncoding: NSASCIIStringEncoding]];
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}
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- (void) _encodeCollection: (id)collection tag: (unsigned)tag class: (unsigned)tagClass {
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MYDEREncoder *subEncoder = [[[self class] alloc] init];
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for (id object in collection)
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[subEncoder _encode: object];
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[self _writeTag: tag class: tagClass constructed: YES data: subEncoder.output];
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[subEncoder release];
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}
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- (void) _encode: (id)object {
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if (!_output)
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_output = [[NSMutableData alloc] initWithCapacity: 1024];
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if ([object isKindOfClass: [NSNumber class]]) {
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[self _encodeNumber: object];
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} else if ([object isKindOfClass: [NSData class]]) {
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[self _writeTag: 4 class: 0 constructed: NO data: object];
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} else if ([object isKindOfClass: [MYBitString class]]) {
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[self _encodeBitString: object];
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} else if ([object isKindOfClass: [NSString class]]) {
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[self _encodeString: object];
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} else if ([object isKindOfClass: [NSDate class]]) {
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[self _encodeDate: object];
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jens@16
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} else if ([object isKindOfClass: [NSNull class]]) {
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jens@16
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[self _writeTag: 5 class: 0 constructed: NO bytes: NULL length: 0];
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jens@16
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} else if ([object isKindOfClass: [NSArray class]]) {
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jens@16
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[self _encodeCollection: object tag: 16 class: 0];
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jens@16
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} else if ([object isKindOfClass: [NSSet class]]) {
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jens@16
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[self _encodeCollection: object tag: 17 class: 0];
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jens@16
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} else if ([object isKindOfClass: [MYOID class]]) {
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jens@16
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[self _writeTag: 6 class: 0 constructed: NO data: [object DEREncoding]];
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jens@16
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} else if ([object isKindOfClass: [MYASN1Object class]]) {
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jens@16
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MYASN1Object *asn = object;
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jens@16
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if (asn.components)
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jens@16
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[self _encodeCollection: asn.components tag: asn.tag class: asn.tagClass];
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jens@16
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else
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jens@16
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[self _writeTag: asn.tag
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class: asn.tagClass
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jens@16
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constructed: asn.constructed
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jens@16
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data: asn.value];
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jens@16
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} else {
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jens@16
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251 |
[NSException raise: MYDEREncoderException format: @"Can't DER-encode a %@", [object class]];
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jens@16
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252 |
}
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jens@16
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253 |
}
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jens@16
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254 |
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jens@16
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255 |
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jens@16
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256 |
- (NSData*) output {
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jens@16
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257 |
if (!_output && !_error) {
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jens@16
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258 |
@try{
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jens@16
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259 |
[self _encode: _rootObject];
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jens@16
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260 |
}@catch (NSException *x) {
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jens@16
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261 |
if ($equal(x.name, MYDEREncoderException)) {
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jens@16
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self.error = MYError(2,MYASN1ErrorDomain, @"%@", x.reason);
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jens@16
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263 |
return nil;
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jens@16
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264 |
} else
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jens@16
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265 |
@throw(x);
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jens@16
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266 |
}
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jens@16
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267 |
}
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jens@16
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268 |
return _output;
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jens@16
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269 |
}
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jens@16
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270 |
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jens@16
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271 |
@synthesize error=_error;
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jens@16
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272 |
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jens@16
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273 |
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jens@16
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274 |
@end
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jens@16
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275 |
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jens@16
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276 |
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jens@16
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277 |
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jens@16
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278 |
#define $data(BYTES...) ({const uint8_t bytes[] = {BYTES}; [NSData dataWithBytes: bytes length: sizeof(bytes)];})
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jens@16
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279 |
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jens@16
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280 |
TestCase(DEREncoder) {
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jens@16
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281 |
CAssertEqual([MYDEREncoder encodeRootObject: [NSNull null] error: nil],
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jens@16
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282 |
$data(0x05, 0x00));
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jens@16
|
283 |
CAssertEqual([MYDEREncoder encodeRootObject: $true error: nil],
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jens@16
|
284 |
$data(0x01, 0x01, 0xFF));
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jens@16
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285 |
CAssertEqual([MYDEREncoder encodeRootObject: $false error: nil],
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jens@16
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286 |
$data(0x01, 0x01, 0x00));
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jens@16
|
287 |
|
|
jens@16
|
288 |
// Integers:
|
|
jens@16
|
289 |
CAssertEqual([MYDEREncoder encodeRootObject: $object(0) error: nil],
|
|
jens@16
|
290 |
$data(0x02, 0x01, 0x00));
|
|
jens@16
|
291 |
CAssertEqual([MYDEREncoder encodeRootObject: $object(1) error: nil],
|
|
jens@16
|
292 |
$data(0x02, 0x01, 0x01));
|
|
jens@16
|
293 |
CAssertEqual([MYDEREncoder encodeRootObject: $object(-1) error: nil],
|
|
jens@16
|
294 |
$data(0x02, 0x01, 0xFF));
|
|
jens@16
|
295 |
CAssertEqual([MYDEREncoder encodeRootObject: $object(72) error: nil],
|
|
jens@16
|
296 |
$data(0x02, 0x01, 0x48));
|
|
jens@16
|
297 |
CAssertEqual([MYDEREncoder encodeRootObject: $object(-128) error: nil],
|
|
jens@16
|
298 |
$data(0x02, 0x01, 0x80));
|
|
jens@16
|
299 |
CAssertEqual([MYDEREncoder encodeRootObject: $object(128) error: nil],
|
|
jens@16
|
300 |
$data(0x02, 0x02, 0x00, 0x80));
|
|
jens@16
|
301 |
CAssertEqual([MYDEREncoder encodeRootObject: $object(255) error: nil],
|
|
jens@16
|
302 |
$data(0x02, 0x02, 0x00, 0xFF));
|
|
jens@16
|
303 |
CAssertEqual([MYDEREncoder encodeRootObject: $object(-256) error: nil],
|
|
jens@16
|
304 |
$data(0x02, 0x02, 0xFF, 0x00));
|
|
jens@16
|
305 |
CAssertEqual([MYDEREncoder encodeRootObject: $object(12345) error: nil],
|
|
jens@16
|
306 |
$data(0x02, 0x02, 0x30,0x39));
|
|
jens@16
|
307 |
CAssertEqual([MYDEREncoder encodeRootObject: $object(-12345) error: nil],
|
|
jens@16
|
308 |
$data(0x02, 0x02, 0xCF, 0xC7));
|
|
jens@16
|
309 |
CAssertEqual([MYDEREncoder encodeRootObject: $object(123456789) error: nil],
|
|
jens@16
|
310 |
$data(0x02, 0x04, 0x07, 0x5B, 0xCD, 0x15));
|
|
jens@16
|
311 |
CAssertEqual([MYDEREncoder encodeRootObject: $object(-123456789) error: nil],
|
|
jens@16
|
312 |
$data(0x02, 0x04, 0xF8, 0xA4, 0x32, 0xEB));
|
|
jens@16
|
313 |
CAssertEqual([MYDEREncoder encodeRootObject: $object(-123456789) error: nil],
|
|
jens@16
|
314 |
$data(0x02, 0x04, 0xF8, 0xA4, 0x32, 0xEB));
|
|
jens@16
|
315 |
|
|
jens@16
|
316 |
// Strings:
|
|
jens@16
|
317 |
CAssertEqual([MYDEREncoder encodeRootObject: @"hello" error: nil],
|
|
jens@16
|
318 |
$data(0x13, 0x05, 'h', 'e', 'l', 'l', 'o'));
|
|
jens@16
|
319 |
CAssertEqual([MYDEREncoder encodeRootObject: @"thérè" error: nil],
|
|
jens@16
|
320 |
$data(0x0C, 0x07, 't', 'h', 0xC3, 0xA9, 'r', 0xC3, 0xA8));
|
|
jens@16
|
321 |
|
|
jens@16
|
322 |
// Dates:
|
|
jens@16
|
323 |
CAssertEqual([MYDEREncoder encodeRootObject: [NSDate dateWithTimeIntervalSinceReferenceDate: 265336576]
|
|
jens@16
|
324 |
error: nil],
|
|
jens@16
|
325 |
$data(0x18, 0x0F, '2', '0', '0', '9', '0', '5', '3', '0', '0', '0', '3', '6', '1', '6', 'Z'));
|
|
jens@16
|
326 |
|
|
jens@16
|
327 |
// Sequences:
|
|
jens@16
|
328 |
CAssertEqual([MYDEREncoder encodeRootObject: $array($object(72), $true) error: nil],
|
|
jens@16
|
329 |
$data(0x30, 0x06, 0x02, 0x01, 0x48, 0x01, 0x01, 0xFF));
|
|
jens@16
|
330 |
CAssertEqual([MYDEREncoder encodeRootObject: $array( $array($object(72), $true),
|
|
jens@16
|
331 |
$array($object(72), $true))
|
|
jens@16
|
332 |
error: nil],
|
|
jens@16
|
333 |
$data(0x30, 0x10,
|
|
jens@16
|
334 |
0x30, 0x06, 0x02, 0x01, 0x48, 0x01, 0x01, 0xFF,
|
|
jens@16
|
335 |
0x30, 0x06, 0x02, 0x01, 0x48, 0x01, 0x01, 0xFF));
|
|
jens@16
|
336 |
}
|
|
jens@16
|
337 |
|
|
jens@16
|
338 |
|
|
jens@16
|
339 |
TestCase(EncodeCert) {
|
|
jens@16
|
340 |
NSError *error = nil;
|
|
jens@17
|
341 |
NSData *cert = [NSData dataWithContentsOfFile: @"../../Tests/iphonedev.cer"]; //TEMP
|
|
jens@16
|
342 |
id certObjects = MYBERParse(cert,&error);
|
|
jens@16
|
343 |
CAssertNil(error);
|
|
jens@16
|
344 |
Log(@"Decoded as:\n%@", [MYASN1Object dump: certObjects]);
|
|
jens@16
|
345 |
NSData *encoded = [MYDEREncoder encodeRootObject: certObjects error: &error];
|
|
jens@16
|
346 |
CAssertNil(error);
|
|
jens@16
|
347 |
id reDecoded = MYBERParse(encoded, &error);
|
|
jens@16
|
348 |
CAssertNil(error);
|
|
jens@16
|
349 |
Log(@"Re-decoded as:\n%@", [MYASN1Object dump: reDecoded]);
|
|
jens@17
|
350 |
[encoded writeToFile: @"../../Tests/iphonedev_reencoded.cer" atomically: YES];
|
|
jens@16
|
351 |
CAssertEqual(encoded,cert);
|
|
jens@16
|
352 |
}
|