#pragma mark - 32位 小写
```
+(NSString *)MD5ForLower32Bate:(NSString *)tel {
//要进行UTF8的转码
const char* input = [tel 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;
}
```
