How to convert text to MD5 64 bytes format in iPhone - iphone

Question

Im using the following method to convert text to MD5 format.
- (NSString*)MD5
{
const char *ptr = [txt_Password.text UTF8String];
unsigned char md5Buffer[CC_MD5_DIGEST_LENGTH];
CC_MD5(ptr, strlen(ptr), md5Buffer);
NSMutableString *output = [NSMutableString stringWithCapacity:CC_MD5_DIGEST_LENGTH * 2];
for(int i = 0; i < CC_MD5_DIGEST_LENGTH; i++)
[output appendFormat:#"%02x",md5Buffer[i]];
return output;
}
However, it returns me the MD5 string in 16 bytes. And i need it in 64 bytes. Any help is appreciated. Thank you!!!

Answer 1

For md5: (Add this on a cathegory over NSString as well)
+ (NSString *)hashForString:(NSString *)aString {
NSData *data = [aString dataUsingEncoding:NSUTF8StringEncoding];
unsigned char digest[CC_MD5_DIGEST_LENGTH];
CC_MD5([data bytes], [data length], digest);
NSString *md5String = [[NSString alloc] initWithBytes:digest length:CC_MD5_DIGEST_LENGTH encoding:NSUTF8StringEncoding];
return [md5String autorelease];
}
For encoding your hashed psw to 64bit format:
- (NSString*)base64MD5HashForString:(NSString *)string {
NSString *md5Hash = [[[NSString hashForString:string] dataUsingEncoding:NSUTF8StringEncoding] encodeBase64];
return md5Hash;
}
Method below is a cathegory over NSData;
static const char kBase64Alphabet[64] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz"
"0123456789+/";
- (NSString*)encodeBase64 {
NSMutableString *encodedData = [NSMutableString string];
int i = 0, j = 0;
unsigned char char_array_3[3];
unsigned char char_array_4[5];
memset(char_array_3, 0, 3*sizeof(char));
memset(char_array_4, 0, 5*sizeof(char));
int length = [self length];
char *bytes = (char*)[self bytes];
while(length--) {
char_array_3[i++] = *(bytes++);
if (i == 3) {
char_array_4[0] = kBase64Alphabet[(char_array_3[0] & 0xfc)>>2];
char_array_4[1] = kBase64Alphabet[((char_array_3[0] & 0x03) <<4) + ((char_array_3[1] & 0xf0) >>4)];
char_array_4[2] = kBase64Alphabet[((char_array_3[1] & 0x0f) <<2) + ((char_array_3[2] & 0xc0) >>6)];
char_array_4[3] = kBase64Alphabet[char_array_3[2]&0x3f];
[encodedData appendString:[NSString stringWithUTF8String:(const char*)char_array_4]];
i = 0;
}
}
if (i) {
for(j=i; j<3; j++)
char_array_3[j] = '\0';
char_array_4[0] = kBase64Alphabet[(char_array_3[0] & 0xfc)>>2];
char_array_4[1] = kBase64Alphabet[((char_array_3[0] & 0x03) <<4) + ((char_array_3[1] & 0xf0) >>4)];
char_array_4[2] = kBase64Alphabet[((char_array_3[1] & 0x0f) <<2) + ((char_array_3[2] & 0xc0) >>6)];
char_array_4[3] = kBase64Alphabet[char_array_3[2]&0x3f];
char_array_4[i+1] = 0;
[encodedData appendString:[NSString stringWithUTF8String:(const char*)char_array_4]];
while((i++<3))
[encodedData appendString:[NSString stringWithUTF8String:"="]];
}
return encodedData;
}