#import <CommonCrypto/CommonDigest.h>
#pragma MD5加密
-(NSString *)md5:(NSString *)str{
const char *cStr = [str UTF8String];
unsigned char result[16];
CC_MD5(cStr, strlen(cStr), 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]];
}