iOS开发 字符串MD5加密

/*** MD5 ***/

#define CC_MD5_DIGEST_LENGTH    16          /* digest length in bytes */

#define CC_MD5_BLOCK_BYTES      64          /* block size in bytes */

#define CC_MD5_BLOCK_LONG       (CC_MD5_BLOCK_BYTES / sizeof(CC_LONG))

- (NSString *)MD5Digest

{

    const char* input = [self UTF8String];

    unsigned char result[CC_MD5_DIGEST_LENGTH];

    CC_MD5(input, (CC_LONG)strlen(input), result);

    

    NSMutableString *digest = [NSMutableString stringWithCapacity:CC_MD5_DIGEST_LENGTH * 2];

    for (NSInteger i = 0; i < CC_MD5_DIGEST_LENGTH; i++) {

        [digest appendFormat:@"%02x", result[i]];

    }

    

    return digest;

}