linux下使用openssl对socket通信加密
2016-09-07 22:05
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Openssl AES加密(字符串加密)
aes_options.c
最后很重要的一点
如果客户端用到加密函数,编译的格式:gcc client.c aes_options.c -o client.c -lpthread -lcrypto
-lcryto 是openssl加密必须要加上的动态库
原文链接
1.首先安装openssl和相关库(Ubuntu) apt-get install openssl libssl-dev 2.编写相关加密解密代码 aes_options.h
ifndef _ASE_H_ #define _ASE_H_ int encrypt(char *input_string, char **encrypt_string); void decrypt(char *encrypt_string, char **decrypt_string, int len); endif
aes_options.c
#include <stdio.h> #include <openssl/aes.h> #include <stdlib.h> #include <string.h> //这个函数将输入字符串加密 int encrypt(char *input_string, char **encrypt_string) { AES_KEY aes; unsigned char key[AES_BLOCK_SIZE]; // AES_BLOCK_SIZE = 16 unsigned char iv[AES_BLOCK_SIZE]; // init vector unsigned int len; // encrypt length (in multiple of AES_BLOCK_SIZE) unsigned int i; // set the encryption length len = 0; if ((strlen(input_string) + 1) % AES_BLOCK_SIZE == 0) { len = strlen(input_string) + 1; } else { len = ((strlen(input_string) + 1) / AES_BLOCK_SIZE + 1) * AES_BLOCK_SIZE; } // Generate AES 128-bit key for (i=0; i<16; ++i) { key[i] = 32 + i; } // Set encryption key for (i=0; i<AES_BLOCK_SIZE; ++i) { iv[i] = 0; } if (AES_set_encrypt_key(key, 128, &aes) < 0) { fprintf(stderr, "Unable to set encryption key in AES\n"); exit(0); } // alloc encrypt_string *encrypt_string = (unsigned char*)calloc(len, sizeof(unsigned char)); if (*encrypt_string == NULL) { fprintf(stderr, "Unable to allocate memory for encrypt_string\n"); exit(-1); } // encrypt (iv will change) AES_cbc_encrypt(input_string, *encrypt_string, len, &aes, iv, AES_ENCRYPT); return len; } //这个函数将字符串解密 void decrypt(char *encrypt_string, char **decrypt_string,int len) { unsigned char key[AES_BLOCK_SIZE]; // AES_BLOCK_SIZE = 16 unsigned char iv[AES_BLOCK_SIZE]; // init vector AES_KEY aes; int i; // Generate AES 128-bit key for (i=0; i<16; ++i) { key[i] = 32 + i; } // alloc decrypt_string *decrypt_string = (unsigned char*)calloc(len, sizeof(unsigned char)); if (*decrypt_string == NULL) { fprintf(stderr, "Unable to allocate memory for decrypt_string\n"); exit(-1); } // Set decryption key for (i=0; i<AES_BLOCK_SIZE; ++i) { iv[i] = 0; } if (AES_set_decrypt_key(key, 128, &aes) < 0) { fprintf(stderr, "Unable to set decryption key in AES\n"); exit(-1); } // decrypt AES_cbc_encrypt(encrypt_string, *decrypt_string, len, &aes, iv, AES_DECRYPT); }
最后很重要的一点
如果客户端用到加密函数,编译的格式:gcc client.c aes_options.c -o client.c -lpthread -lcrypto
-lcryto 是openssl加密必须要加上的动态库
原文链接
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