| #import "DDData.h" |
| #import <CommonCrypto/CommonDigest.h> |
| |
| |
| @implementation NSData (DDData) |
| |
| static char encodingTable[64] = { |
| 'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P', |
| 'Q','R','S','T','U','V','W','X','Y','Z','a','b','c','d','e','f', |
| 'g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v', |
| 'w','x','y','z','0','1','2','3','4','5','6','7','8','9','+','/' }; |
| |
| - (NSData *)md5Digest |
| { |
| unsigned char result[CC_MD5_DIGEST_LENGTH]; |
| |
| CC_MD5([self bytes], (CC_LONG)[self length], result); |
| return [NSData dataWithBytes:result length:CC_MD5_DIGEST_LENGTH]; |
| } |
| |
| - (NSData *)sha1Digest |
| { |
| unsigned char result[CC_SHA1_DIGEST_LENGTH]; |
| |
| CC_SHA1([self bytes], (CC_LONG)[self length], result); |
| return [NSData dataWithBytes:result length:CC_SHA1_DIGEST_LENGTH]; |
| } |
| |
| - (NSString *)hexStringValue |
| { |
| NSMutableString *stringBuffer = [NSMutableString stringWithCapacity:([self length] * 2)]; |
| |
| const unsigned char *dataBuffer = [self bytes]; |
| int i; |
| |
| for (i = 0; i < [self length]; ++i) |
| { |
| [stringBuffer appendFormat:@"%02x", (unsigned int)dataBuffer[i]]; |
| } |
| |
| return [stringBuffer copy]; |
| } |
| |
| - (NSString *)base64Encoded |
| { |
| const unsigned char *bytes = [self bytes]; |
| NSMutableString *result = [NSMutableString stringWithCapacity:[self length]]; |
| unsigned long ixtext = 0; |
| unsigned long lentext = [self length]; |
| long ctremaining = 0; |
| unsigned char inbuf[3], outbuf[4]; |
| unsigned short i = 0; |
| unsigned short charsonline = 0, ctcopy = 0; |
| unsigned long ix = 0; |
| |
| while( YES ) |
| { |
| ctremaining = lentext - ixtext; |
| if( ctremaining <= 0 ) break; |
| |
| for( i = 0; i < 3; i++ ) { |
| ix = ixtext + i; |
| if( ix < lentext ) inbuf[i] = bytes[ix]; |
| else inbuf [i] = 0; |
| } |
| |
| outbuf [0] = (inbuf [0] & 0xFC) >> 2; |
| outbuf [1] = ((inbuf [0] & 0x03) << 4) | ((inbuf [1] & 0xF0) >> 4); |
| outbuf [2] = ((inbuf [1] & 0x0F) << 2) | ((inbuf [2] & 0xC0) >> 6); |
| outbuf [3] = inbuf [2] & 0x3F; |
| ctcopy = 4; |
| |
| switch( ctremaining ) |
| { |
| case 1: |
| ctcopy = 2; |
| break; |
| case 2: |
| ctcopy = 3; |
| break; |
| } |
| |
| for( i = 0; i < ctcopy; i++ ) |
| [result appendFormat:@"%c", encodingTable[outbuf[i]]]; |
| |
| for( i = ctcopy; i < 4; i++ ) |
| [result appendString:@"="]; |
| |
| ixtext += 3; |
| charsonline += 4; |
| } |
| |
| return [NSString stringWithString:result]; |
| } |
| |
| - (NSData *)base64Decoded |
| { |
| const unsigned char *bytes = [self bytes]; |
| NSMutableData *result = [NSMutableData dataWithCapacity:[self length]]; |
| |
| unsigned long ixtext = 0; |
| unsigned long lentext = [self length]; |
| unsigned char ch = 0; |
| unsigned char inbuf[4] = {0, 0, 0, 0}; |
| unsigned char outbuf[3] = {0, 0, 0}; |
| short i = 0, ixinbuf = 0; |
| BOOL flignore = NO; |
| BOOL flendtext = NO; |
| |
| while( YES ) |
| { |
| if( ixtext >= lentext ) break; |
| ch = bytes[ixtext++]; |
| flignore = NO; |
| |
| if( ( ch >= 'A' ) && ( ch <= 'Z' ) ) ch = ch - 'A'; |
| else if( ( ch >= 'a' ) && ( ch <= 'z' ) ) ch = ch - 'a' + 26; |
| else if( ( ch >= '0' ) && ( ch <= '9' ) ) ch = ch - '0' + 52; |
| else if( ch == '+' ) ch = 62; |
| else if( ch == '=' ) flendtext = YES; |
| else if( ch == '/' ) ch = 63; |
| else flignore = YES; |
| |
| if( ! flignore ) |
| { |
| short ctcharsinbuf = 3; |
| BOOL flbreak = NO; |
| |
| if( flendtext ) |
| { |
| if( ! ixinbuf ) break; |
| if( ( ixinbuf == 1 ) || ( ixinbuf == 2 ) ) ctcharsinbuf = 1; |
| else ctcharsinbuf = 2; |
| ixinbuf = 3; |
| flbreak = YES; |
| } |
| |
| inbuf [ixinbuf++] = ch; |
| |
| if( ixinbuf == 4 ) |
| { |
| ixinbuf = 0; |
| outbuf [0] = ( inbuf[0] << 2 ) | ( ( inbuf[1] & 0x30) >> 4 ); |
| outbuf [1] = ( ( inbuf[1] & 0x0F ) << 4 ) | ( ( inbuf[2] & 0x3C ) >> 2 ); |
| outbuf [2] = ( ( inbuf[2] & 0x03 ) << 6 ) | ( inbuf[3] & 0x3F ); |
| |
| for( i = 0; i < ctcharsinbuf; i++ ) |
| [result appendBytes:&outbuf[i] length:1]; |
| } |
| |
| if( flbreak ) break; |
| } |
| } |
| |
| return [NSData dataWithData:result]; |
| } |
| |
| @end |