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/*
* You need to have the OpenSSL header files (as well as the location of their
* include directory given to Project Builder) for this to compile. For it
* to link, add /usr/lib/libcrypto.dylib and /usr/lib/libssl.dylib to the linked
* frameworks.
*/

/*
* Compresses/decompresses data using zlib (see RFC 1950 and /usr/include/zlib.h)
*
* Be sure to add /usr/lib/libz.dylib to the linked frameworks, or add "-lz" to
* 'Other Linker Flags' in the 'Linker Settings' section of the target's
* 'Build Settings'
*
*/

/* NSData_transformations.m */

#import "NSData_transformations.h"
#include "pbkdf2.h"
#include "hmacsha1.h"
#include "broken_md5.h"

#include <unistd.h>
#include <zlib.h>
#include <openssl/bio.h>

#import <WebKit/WebKit.h>

@implementation NSData (NVUtilities)

/*
* Compress the data, default level of compression
*/
- (NSMutableData *)compressedData {
return [self compressedDataAtLevel:Z_DEFAULT_COMPRESSION];
}


/*
* Compress the data at the given compression level; stores the original data
* size at the end of the compressed data
*/
- (NSMutableData *)compressedDataAtLevel:(int)level {

NSMutableData *newData;
unsigned long bufferLength;
int zlibError;

/*
* zlib says to make sure the destination has 0.1% more + 12 bytes; last
* additional bytes to store the original size (needed for uncompress)
*/
bufferLength = ceil( (float) [self length] * 1.001 ) + 12 + sizeof( unsigned );
newData = [NSMutableData dataWithLength:bufferLength];
if( newData != nil ) {
zlibError = compress2([newData mutableBytes], &bufferLength,
[self bytes], [self length], level);
if (zlibError == Z_OK) {
// Add original size to the end of the buffer, written big-endian
*( (unsigned *) ([newData mutableBytes] + bufferLength) ) =
            NSSwapHostIntToBig( [self length] );
[newData setLength:bufferLength + sizeof(unsigned)];
} else {
NSLog(@"error compressing: %s", zError(zlibError));
newData = nil;
}
} else
NSLog(@"error compressing: couldn't allocate memory");

return newData;
}


/*
* Decompress data
*/
- (NSMutableData *) uncompressedData {

NSMutableData *newData;
unsigned originalSize;
unsigned long outSize;
int zlibError;

newData = nil;
if ( [self isCompressedFormat] ) {
originalSize = NSSwapBigIntToHost(*((unsigned *) ([self bytes] + [self length] - sizeof(unsigned))));

//catch the NSInvalidArgumentException that's thrown if originalSize is too large
NS_DURING
newData = [ NSMutableData dataWithLength:originalSize ];
NS_HANDLER
if ([[localException name] isEqualToString:NSInvalidArgumentException] ) {
NSLog(@"error decompressing--bad size: %@", [localException reason]);
NS_VALUERETURN( nil, NSMutableData * );
} else
[localException raise]; // This should NEVER happen...
NS_ENDHANDLER

if( newData != nil ) {
outSize = originalSize;
zlibError = uncompress([newData mutableBytes], &outSize, [self bytes], [self length] - sizeof(unsigned));
if( zlibError != Z_OK ) {
NSLog(@"decompression failed: %s", zError(zlibError));
newData = nil;
} else if (originalSize != outSize)
NSLog(@"error decompressing: extracted size %u does not match original of %u", outSize, originalSize);
} else
NSLog(@"error allocating memory while decompressing");
} else
NSLog(@"error decompressing: data does not seem to be compressed with zlib");

return newData;
}


/*
* Quick check of the data to avoid obviously-not-compressed data (see RFC)
*/
- (BOOL)isCompressedFormat {
const unsigned char *bytes;

bytes = [self bytes];
/*
* The checks are:
* ( *bytes & 0x0F ) == 8 : method is deflate (this is called CM compression method, in the RFC)
* ( *bytes & 0x80 ) == 0 : info must be at most seven, this makes sure the MSB is not set, otherwise it
* is at least 8 (this is called CINFO, compression info, in the RFC)
* *( (short *) bytes ) ) % 31 == 0 : the two first bytes as a whole (big endian format) must be a multiple of 31
* (this is discussed in the FCHECK in FLG, flags, section)
*/
if( ( *bytes & 0x0F ) == 8 && ( *bytes & 0x80 ) == 0 &&
NSSwapBigShortToHost( *( (short *) bytes ) ) % 31 == 0 )
return YES;

return NO;
}

+ (NSMutableData *)randomDataOfLength:(int)len {
NSMutableData *randomData = nil;
ssize_t amtRead = 0, oneRead;
NSFileHandle *devRandom = [ NSFileHandle fileHandleForReadingAtPath:@"/dev/random" ];

if(devRandom != nil) {
randomData = [NSMutableData dataWithLength:len];
while (amtRead < len) {

//read mutable data
oneRead = read( [ devRandom fileDescriptor ], [ randomData mutableBytes ],
len - amtRead );
if (oneRead <= 0 && ( errno != EINTR && errno != EAGAIN ) ) {

NSLog(@"random data read error: %s", strerror(errno));
randomData = nil;
break;
}
amtRead += oneRead;
}
[devRandom closeFile];
} else
NSLog(@"error opening /dev/random");

return randomData;
}

- (NSMutableData*)derivedKeyOfLength:(int)len salt:(NSData*)salt iterations:(int)count {

NSMutableData *derivedKey = [NSMutableData dataWithLength:len];

//NSDate *date = [NSDate date];
//when compiled with -Os or greater, this is always faster than OpenSSL version
#if 1
if (!pbkdf2_sha1([self bytes], [self length], [salt bytes], [salt length], (unsigned int)count, [derivedKey mutableBytes], (size_t)len))
return nil;
//NSLog(@"dk_time(%d): %g", count, (float)[[NSDate date] timeIntervalSinceDate:date]);
#else
if (!PKCS5_PBKDF2_HMAC_SHA1([self bytes], [self length], (unsigned char*)[salt bytes], [salt length], count, len, [derivedKey mutableBytes]))
return nil;
#endif

return derivedKey;
}

- (unsigned long)CRC32 {
uLong crc = crc32(0L, Z_NULL, 0);
    return crc32(crc, [self bytes], [self length]);
}

- (NSData*)SHA1Digest {
sha1_ctx_nv keyhash;

NSMutableData *mutableData = [NSMutableData dataWithLength:20];

sha1_init_ctx(&keyhash);
sha1_process_bytes([self bytes], [self length], &keyhash);
sha1_finish_ctx(&keyhash, [mutableData mutableBytes]);

return mutableData;
}

- (NSData*)BrokenMD5Digest {
BrokenMD5_CTX context;
NSMutableData *digest = [NSMutableData dataWithLength:16];
    
    BrokenMD5Init(&context);
    BrokenMD5Update(&context, [self bytes], [self length]);
    BrokenMD5Final([digest mutableBytes], &context);

return digest;
}

- (NSData*)MD5Digest {
EVP_MD_CTX mdctx;
unsigned char md_value[EVP_MAX_MD_SIZE];
unsigned int md_len;
EVP_DigestInit(&mdctx, EVP_md5());
EVP_DigestUpdate(&mdctx, [self bytes], [self length]);
EVP_DigestFinal(&mdctx, md_value, &md_len);
return [NSData dataWithBytes: md_value length: md_len];
}


- (NSString*)pathURLFromWebArchive {

WebResource *resource = [[[[WebArchive alloc] initWithData:self] autorelease] mainResource];
NSURL *url = [resource URL];

//it's not any kind of URL we want to keep
//this is probably text from another app's internal WebKit view
if ([[url scheme] isEqualToString:@"applewebdata"] || [[url scheme] isEqualToString:@"x-msg"])
return nil;

return [url absoluteString];
}

- (BOOL)fsRefAsAlias:(FSRef*)fsRef {
    AliasHandle aliasHandle;
    Boolean changedThrownAway;
    
    if (self && PtrToHand([self bytes], (Handle*)&aliasHandle, [self length]) == noErr) {

if (FSResolveAliasWithMountFlags(NULL, aliasHandle, fsRef, &changedThrownAway, kResolveAliasFileNoUI) == noErr)
return YES;
    }

    return NO;
}

+ (NSData*)uncachedDataFromFile:(NSString*)filename {

return [NSData dataWithContentsOfFile:filename options:NSUncachedRead error:NULL];
}

+ (NSData*)aliasDataForFSRef:(FSRef*)fsRef {
    
    FSRef userHomeFoundRef, *relativeRef = &userHomeFoundRef;
    
    OSErr err = FSFindFolder(kUserDomain, kCurrentUserFolderType, kCreateFolder, &userHomeFoundRef);
    if (err != noErr) {
relativeRef = NULL;
NSLog(@"FSFindFolder error: %d", err);
    }
    
    AliasHandle aliasHandle;
    NSData *theData = nil;
    
    //fill handle from fsref, storing path relative to user directory
    if (FSNewAlias(relativeRef, fsRef, &aliasHandle) == noErr && aliasHandle != NULL) {
HLock((Handle)aliasHandle);
theData = [NSData dataWithBytes:*aliasHandle length:GetHandleSize((Handle) aliasHandle)];
HUnlock((Handle)aliasHandle);
    }
    
    return theData;
}

//yes, to do the same encoding detection we could use something like initWithContentsOfFile: or
//initWithContentsOfFile:(NSString *)path usedEncoding:(NSStringEncoding *)enc error:(NSError **)error
//but those 1) require file paths and 2) the non-deprecated version is available only on 10.4

- (NSMutableString*)newStringUsingBOMReturningEncoding:(NSStringEncoding*)encoding {
unsigned len = [self length];
NSMutableString *string = nil;

if (len % 2 != 0 || !len) {
return nil;
}
const unichar byteOrderMark = 0xFEFF;
const unichar byteOrderMarkSwapped = 0xFFFE;

BOOL foundBOM = NO;
BOOL swapped = NO;
unsigned char *b = (unsigned char*)[self bytes];
unichar *uptr = (unichar*)b;

if (*uptr == byteOrderMark) {
b = (unsigned char*)++uptr;
len -= sizeof(unichar);
foundBOM = YES;
} else if (*uptr == byteOrderMarkSwapped) {
b = (unsigned char*)++uptr;
len -= sizeof(unichar);
swapped = YES;
foundBOM = YES;
} else if (len > 2 && b[0] == 0xEF && b[1] == 0xBB && b[2] == 0xBF) {
len -= 3;
b += 3;

//false because we just fixed the BOM right up there
//string = (NSString*)CFStringCreateWithBytes(kCFAllocatorDefault, b, len, kCFStringEncodingUTF8, false);
string = [[NSMutableString alloc] initWithBytes:b length:len encoding:NSUTF8StringEncoding];
if (string)
*encoding = NSUTF8StringEncoding;

return string;
}

if (foundBOM) {
unsigned char *u = (unsigned char*)malloc(len);
if (swapped) {
unsigned i;

for (i = 0; i < len; i += 2) {
u[i] = b[i + 1];
u[i + 1] = b[i];
}
} else {
memcpy(u, b, len);
}


string = (NSMutableString*)CFStringCreateMutableWithExternalCharactersNoCopy(NULL, (UniChar *)u, (CFIndex)len/2, (CFIndex)len/2, kCFAllocatorDefault);
if (string)
*encoding = NSUnicodeStringEncoding;
return string;
}

return nil;
}


- (NSString *)encodeBase64 {
    return [self encodeBase64WithNewlines:YES];
}

- (NSString *)encodeBase64WithNewlines:(BOOL)encodeWithNewlines {

    // Create a memory buffer which will contain the Base64 encoded string
    BIO * mem = BIO_new(BIO_s_mem());
    
    // Push on a Base64 filter so that writing to the buffer encodes the data
    BIO * b64 = BIO_new(BIO_f_base64());
    if (!encodeWithNewlines)
        BIO_set_flags(b64, BIO_FLAGS_BASE64_NO_NL);
    mem = BIO_push(b64, mem);
    
    // Encode all the data
    BIO_write(mem, [self bytes], [self length]);
    (void)BIO_flush(mem);
    
    // Create a new string from the data in the memory buffer
    char * base64Pointer;
    long base64Length = BIO_get_mem_data(mem, &base64Pointer);
    NSString * base64String = [[NSString alloc] initWithBytes:base64Pointer length:base64Length encoding:NSASCIIStringEncoding];
    
    // Clean up and go home
    BIO_free_all(mem);
    return [base64String autorelease];
}




@end

@implementation NSMutableData (NVCryptoRelated)

- (void)reverseBytes {
int head, tail;
unsigned char temp, *str = [self mutableBytes];
if (!str) return;
tail = [self length] - 1;

for (head = 0; head < tail; ++head, --tail) {
temp = str[tail];
str[tail] = str[head];
str[head] = temp;
}
}

//extends nsmutabledata if necessary
- (void)alignForBlockSize:(int)alignedBlockSize {
int dataBlockSize = [self length];
int paddedDataBlockSize = 0;

if (dataBlockSize <= alignedBlockSize)
paddedDataBlockSize = alignedBlockSize;
else
paddedDataBlockSize = alignedBlockSize * ((dataBlockSize + (alignedBlockSize-1)) / alignedBlockSize);

//if malloc was used on conventional architectures, nsdata should be smart enough not to have to allocate a new block
int difference = paddedDataBlockSize - dataBlockSize;
if (difference > 0)
[self increaseLengthBy:difference];
}

- (BOOL)encryptAESDataWithKey:(NSData*)key iv:(NSData*)iv {
return [self encryptDataWithCipher:EVP_aes_256_cbc() key:key iv:iv];
}

- (BOOL)decryptAESDataWithKey:(NSData*)key iv:(NSData*)iv {
return [self decryptDataWithCipher:EVP_aes_256_cbc() key:key iv:iv];
}


//these two methods will change the size of the data, but at large sizes that should be well within the malloc'ed block padding, anyway
- (BOOL)encryptDataWithCipher:(const EVP_CIPHER*)cipher key:(NSData*)key iv:(NSData*)iv {
int originalDataLength = [self length];

EVP_CIPHER_CTX cipherContext;
if (!EVP_EncryptInit(&cipherContext, cipher /*EVP_aes_256_cbc()*/, NULL, NULL)) {
NSLog(@"Couldn't initialization encryption?");
return NO;
}
//check IV and key lengths
if ((int)[iv length] != EVP_CIPHER_CTX_iv_length(&cipherContext)) {
NSLog(@"initialization vector length was wrong size: %u", [iv length]);
return NO;
}
if ((int)[key length] != EVP_CIPHER_CTX_key_length(&cipherContext)) {
NSLog(@"encryption key length was wrong size: %u", [key length]);
return NO;
}

//actually init the IV and key
if (!EVP_EncryptInit( &cipherContext, NULL, [key bytes], [iv bytes])) {
NSLog(@"Couldn't init cipher context with IV and key");
return NO;
}

//[self alignForBlockSize:EVP_CIPHER_CTX_block_size(&cipherContext)];
[self increaseLengthBy:EVP_CIPHER_CTX_block_size(&cipherContext)];
int encLen, finalLen = 0;

encLen = [self length];
if (!EVP_EncryptUpdate(&cipherContext, [self mutableBytes], &encLen,
(unsigned char *)[self bytes], originalDataLength)) {
NSLog(@"Couldn't encrypt data--buffer is wrong size?");
return NO;
}

finalLen = encLen;
encLen = [self length] - finalLen;
if (!EVP_EncryptFinal(&cipherContext, (unsigned char *)[self mutableBytes] + finalLen, &encLen)) {
NSLog(@"Couldn't encrypt final buffer--buffer is wrong size?");
return NO;
}
finalLen += encLen;

[self setLength:finalLen];

EVP_CIPHER_CTX_cleanup(&cipherContext);

return YES;
}

- (BOOL)decryptDataWithCipher:(const EVP_CIPHER*)cipher key:(NSData*)key iv:(NSData*)iv {
int originalDataLength = [self length];

EVP_CIPHER_CTX cipherContext;
if (!EVP_DecryptInit(&cipherContext, cipher /*EVP_aes_256_cbc()*/, NULL, NULL)) {
NSLog(@"Couldn't initialize decryption?");
return NO;
}
//check IV and key lengths
if ((int)[iv length] != EVP_CIPHER_CTX_iv_length(&cipherContext)) {
NSLog(@"initialization vector length was wrong size: %u", [iv length]);
return NO;
}
if ((int)[key length] != EVP_CIPHER_CTX_key_length(&cipherContext)) {
NSLog(@"decryption key length was wrong size: %u", [key length]);
return NO;
}

//actually init the IV and key
if (!EVP_DecryptInit( &cipherContext, NULL, [key bytes], [iv bytes])) {
NSLog(@"Couldn't init cipher context with IV and key");
return NO;
}

//[self alignForBlockSize:EVP_CIPHER_CTX_block_size(&cipherContext)];
[self increaseLengthBy:EVP_CIPHER_CTX_block_size(&cipherContext)];
int decLen, finalLen = 0;

decLen = [self length];
if (!EVP_DecryptUpdate(&cipherContext, [self mutableBytes], &decLen,
(unsigned char *)[self bytes], originalDataLength)) {
NSLog(@"Couldn't decrypt data--buffer is wrong size?");
return NO;
}

finalLen = decLen;
decLen = [self length] - finalLen;
if (!EVP_DecryptFinal(&cipherContext, (unsigned char *)[self mutableBytes] + finalLen, &decLen)) {
char buf[256];
ERR_error_string(ERR_get_error(), buf, sizeof(buf));
NSLog(@"Couldn't decrypt final buffer: %s", buf);
return NO;
}
finalLen += decLen;

[self setLength:finalLen];

EVP_CIPHER_CTX_cleanup(&cipherContext);


return YES;
}

@end
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