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echo 1 > /proc/sys/vm/overcommit_memory
echo never > /sys/kernel/mm/transparent_hugepage/enabled

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//java
static int tableSizeFor(int cap) {
        int n = cap - 1;
        n |= n >>> 1;
        n |= n >>> 2;
        n |= n >>> 4;
        n |= n >>> 8;
        n |= n >>> 16;
        return (n < 0) ? 1 :  n + 1;
}

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static char * string_trim (char *s) {
    char   *p;

    /* skip leading white spaces */
    while (*s && isspace (*s))
        ++s;

    /* trim trailing white spaces */
    p = s + strlen (s) - 1;
    while (isspace (*p))

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NSString *string = @"我123";
const char *inStr = [string UTF8String];
unsigned char result[MD5_DIGEST_LENGTH];
NSMutableString *outStr = [NSMutableString string];
MD5((unsigned char *)inStr, strlen(inStr), result);
unsigned int i;
for (i = 0; i < MD5_DIGEST_LENGTH; i++){
    [outStr appendFormat:@"%02x", result[i]];
}
NSLog(@"input string:%@" ,string);

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#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <openssl/aes.h>
  
int main(int argc, char** argv) {
    AES_KEY aes;
    unsigned char key[AES_BLOCK_SIZE];        // AES_BLOCK_SIZE = 16
    unsigned char iv[AES_BLOCK_SIZE];        // init vector
    unsigned char* input_string;

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yum install libuuid-devel

/**
 *  gcc -o uuid uuid.c -luuid
 */

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//
//gcc -std=c99 crypto.m -framework Foundation
//
//

#import <Foundation/Foundation.h>
#import <CommonCrypto/CommonCryptor.h>

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NSData+Zlib.h

#import 

@interface NSData (Zlib)
- (id)deflate:(int)compressionLevel;
- (id)inflate;
@end

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#import <CommonCrypto/CommonDigest.h>

NSString *md5_str = @"1234567890";
const char *cStr = [md5_str UTF8String];
unsigned char digest[CC_MD5_DIGEST_LENGTH];
CC_MD5(cStr, (CC_LONG)strlen(cStr), digest);

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

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#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <unistd.h>
 
int main(int argc, char **argv) {