stringencrypt.zip_StringEncrypt

#include <stdio.h> #include <windows.h> #include <string.h> #include <openssl/evp.h> #include <openssl/x509.h> void tEVP_Encrypt() { unsigned char key[EVP_MAX_KEY_LENGTH]; unsigned char iv[EVP_MAX_KEY_LENGTH]; EVP_CIPHER_CTX ctx; unsigned char out[1024]; int outl; int outltmp; char *msg="Hello OpenSSL"; int rv; int i; for(i=0;i<24;i++) key[i]=i; for(i=0;i<8;i++) iv[i]=i; memset(out,0,1024); EVP_CIPHER_CTX_init(&ctx); rv=EVP_EncryptInit_ex(&ctx,EVP_des_ede3_cbc(),NULL,key,iv); if(rv !=1) { printf("error\n"); return ; } rv=EVP_EncryptUpdate(&ctx,out,&outl,(unsigned char *)msg,strlen(msg)); if(rv !=1) { printf("error\n"); return ; } rv=EVP_EncryptFinal_ex(&ctx,out+outl,&outltmp); if(rv != 1) { printf("error\n"); return ; } outl+=outltmp; printf("former message:%s\n",msg); printf("cipher length:%d\n cipher message:\n",outl); for(i=0;i<outl;i++) printf("0x%02x ",out[i]); printf("\n"); } int main() { OpenSSL_add_all_algorithms(); tEVP_Encrypt(); return 0; }