Objective-C Encryption Algorithm

#import <CommonCrypto/CommonDigest.h>#import <CommonCrypto/CommonCryptor.h>//MD5- (NSString*)md5Hash {    unsigned char result[CC_MD5_DIGEST_LENGTH];    CC_MD5([self bytes], [self length], result);        return [NSString stringWithFormat:            @"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",            result[0], result[1], result[2], result[3], result[4], result[5], result[6], result[7],            result[8], result[9], result[10], result[11], result[12], result[13], result[14], result[15]            ];}//SHA1- (NSString*)sha1Hash {    unsigned char result[CC_SHA1_DIGEST_LENGTH];    CC_SHA1([self bytes], [self length], result);        return [NSString stringWithFormat:            @"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",            result[0], result[1], result[2], result[3], result[4], result[5], result[6], result[7],            result[8], result[9], result[10], result[11], result[12], result[13], result[14], result[15],            result[16], result[17], result[18], result[19]            ];}

///////////////////////////////////////////////////////////////////////////////////////////////////// base64 code found on http://www.cocoadev.com/index.pl?BaseSixtyFour// where the poster released it to public domain// style not exactly congruous with normal three20 style, but kept mostly intact with the originalstatic const char encodingTable[] ="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";///////////////////////////////////////////////////////////////////////////////////////////////////+ (NSData*)dataWithBase64EncodedString:(NSString *)string {    if ([string length] == 0)        return [NSData data];        static char *decodingTable = NULL;    if (decodingTable == NULL)    {        decodingTable = malloc(256);        if (decodingTable == NULL)            return nil;        memset(decodingTable, CHAR_MAX, 256);        NSUInteger i;        for (i = 0; i < 64; i++)            decodingTable[(short)encodingTable[i]] = i;    }        const char *characters = [string cStringUsingEncoding:NSASCIIStringEncoding];    if (characters == NULL)     //  Not an ASCII string!        return nil;    char *bytes = malloc((([string length] + 3) / 4) * 3);    if (bytes == NULL)        return nil;    NSUInteger length = 0;        NSUInteger i = 0;    while (YES)    {        char buffer[4];        short bufferLength;        for (bufferLength = 0; bufferLength < 4; i++)        {            if (characters[i] == '\0')                break;            if (isspace(characters[i]) || characters[i] == '=')                continue;            buffer[bufferLength] = decodingTable[(short)characters[i]];            if (buffer[bufferLength++] == CHAR_MAX)      //  Illegal character!            {                free(bytes);                return nil;            }        }                if (bufferLength == 0)            break;        if (bufferLength == 1)      //  At least two characters are needed to produce one byte!        {            free(bytes);            return nil;        }                //  Decode the characters in the buffer to bytes.        bytes[length++] = (buffer[0] << 2) | (buffer[1] >> 4);        if (bufferLength > 2)            bytes[length++] = (buffer[1] << 4) | (buffer[2] >> 2);        if (bufferLength > 3)            bytes[length++] = (buffer[2] << 6) | buffer[3];    }        realloc(bytes, length);    return [NSData dataWithBytesNoCopy:bytes length:length];}///////////////////////////////////////////////////////////////////////////////////////////////////- (NSString *)base64Encoding {    if ([self length] == 0)        return @"";        char *characters = malloc((([self length] + 2) / 3) * 4);    if (characters == NULL)        return nil;    NSUInteger length = 0;        NSUInteger i = 0;    while (i < [self length])    {        char buffer[3] = {0,0,0};        short bufferLength = 0;        while (bufferLength < 3 && i < [self length])            buffer[bufferLength++] = ((char *)[self bytes])[i++];                // Encode the bytes in the buffer to four characters,        // including padding "=" characters if necessary.        characters[length++] = encodingTable[(buffer[0] & 0xFC) >> 2];        characters[length++] = encodingTable[((buffer[0] & 0x03) << 4) | ((buffer[1] & 0xF0) >> 4)];        if (bufferLength > 1)            characters[length++] = encodingTable[((buffer[1] & 0x0F) << 2) | ((buffer[2] & 0xC0) >> 6)];        else characters[length++] = '=';        if (bufferLength > 2)            characters[length++] = encodingTable[buffer[2] & 0x3F];        else characters[length++] = '=';    }        return [[[NSString alloc] initWithBytesNoCopy:characters length:length                                         encoding:NSASCIIStringEncoding freeWhenDone:YES]            autorelease];}// end recycled base64 code///////////////////////////////////////////////////////////////////////////////////////////////////

# Import <commoncrypto/commondigest. h> # import <commoncrypto/commoncryptor. h> // AES encryption-(nsdata *) aes256encryptwithkey :( nsstring *) Key {char keyptr [k1_eysizeaes256 + 1]; bzero (keyptr, sizeof (keyptr); [Key getcstring: keyptr maxlength: sizeof (keyptr) encoding: nsutf8stringencoding]; nsuinteger datalength = [self length]; size_t buffersize = datalength + buffers; void * buffer = malloc (buffersize ); size_t encrypt = 0; cccryptorstatus cryptstatus = cccrypt (kccencrypt, encrypt, decrypt | decrypt, keyptr, decrypt, null, [self bytes], datalength, buffer, buffersize, & numbytesencrypted ); if (cryptstatus = kccsuccess) {return [nsdata datawithbytesnocopy: Buffer length: numbytesencrypted];} Free (buffer); Return nil;} // AES decryption-(nsdata *) aes256decryptwithkey :( nsstring *) Key {char keyptr [kcckeysizeaes256 + 1]; bzero (keyptr, sizeof (keyptr); [Key getcstring: keyptr maxlength: sizeof (keyptr) Encoding: required]; nsuinteger datalength = [self length]; size_t buffersize = datalength + buffers; void * buffer = malloc (buffersize); size_t buffers = 0; cccryptorstatus cryptstatus = cccrypt (encrypted, encrypt, decrypt | kccoptionecbmode, keyptr, delimiter, null, [self bytes], datalength, buffer, buffersize, & bytes); If (cryptstatus = kccsuccess) {return [nsdata datawithbytesnocopy: buffer length: numbytesdecrypted];} Free (buffer); Return nil ;}

Author: Tracy E

Source: http://www.cnblogs.com/tracy-e

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