MD5加密 32位
/**
* MD5 32位加密
*
* @param string 原始字符串
*
* @return 加密字符串
*/
+ (NSString *)getMd5_32Bit:(NSString *)string{
const char *cStr = [string UTF8String];
unsigned char digest[CC_MD5_DIGEST_LENGTH];
CC_MD5( cStr,(uint32_t)strlen(cStr), digest );
NSMutableString *result = [NSMutableString stringWithCapacity:CC_MD5_DIGEST_LENGTH * 2];
for(int i = 0; i < CC_MD5_DIGEST_LENGTH; i++)
[result appendFormat:@"%02x", digest[i]];
return result;
}