Here is my code:
int main(int argc, char *argv[])
{
EVP_CIPHER_CTX ctx;
char key[EVP_MAX_KEY_LENGTH];
char iv[EVP_MAX_IV_LENGTH];
char intext[] = "The problem will be solved until12345"; //32 unsigned char outbuf[1024];
unsigned char recover_msg[1024];
unsigned char final[1024];
int size_recover_msg, size_final;
int outlen, tmplen;
int i;
printf("\n START!!! \n");
RAND_screen();
RAND_bytes(key, EVP_MAX_KEY_LENGTH);
RAND_bytes (iv, EVP_MAX_IV_LENGTH); //initialization
for (i=0; i<1024; i++){
outbuf[i]='\0';
recover_msg[i]='\0';
final[i]='\0';
} //encryption
EVP_CIPHER_CTX_init(&ctx);
EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc( ), NULL, key, iv);printf("\n EVP_CIPHER_CTX_key_length(&ctx): %d ", EVP_CIPHER_CTX_key_length(&ctx));
printf("\n Size of plaintext: %d \n", strlen(intext));
if(!EVP_EncryptUpdate(&ctx, outbuf, &outlen, intext, strlen(intext))) printf("\n ERROR! \n");
// Buffer passed to EVP_EncryptFinal() must be after data just
// encrypted to avoid overwriting it.
if(!EVP_EncryptFinal_ex(&ctx, outbuf + outlen, &tmplen)) printf("\n ERROR!! \n");
outlen += tmplen;
//print the ciphertext
printf("\n ciphertext: \n");
for (i=0;i<outlen;i++) printf("%02x",outbuf[i]);
printf("\n");EVP_CIPHER_CTX_cleanup(&ctx);
//Decryption
if (!EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc( ), NULL, key, iv))
printf("\n ERROR!! \n");if (!EVP_DecryptUpdate(&ctx, recover_msg, &size_recover_msg, outbuf, outlen))
printf("\n ERROR!! \n");
if (!EVP_DecryptFinal_ex(&ctx, final, &size_final))
printf("\n ERROR!! \n"); //print the recovered plaintext as a string
printf("\n recovered_plaintext1: \n %s \n", recover_msg); //print the recovered plaintext as an array
printf("\n recovered_plaintext2: \n ");
for (i=0;i<=size_recover_msg;i++) printf("%c",recover_msg[i]); //print the resultt of finalization phase
printf("\n\n final: %s \n", final);
printf("\n size_final = %d \n", size_final);EVP_CIPHER_CTX_cleanup(&ctx);
}//end main
Another thing I coundn't understand is why "recovered_plaintext1" sometimes ataches trash when printed in the screen, and sometimes doesn't.
Thanks for any help!
Rafael
-- Rafael Cividanes Instituto Tecnológico de Aeronáutica - ITA Divisão de Ciência da Computação - IEC Pça. Mal.Eduardo Gomes, 50 Vila das Acácias CTA-ITA-IEP 12.228-900 São José dos Campos,SP Prédio da Guerra Eletrônica - Sala 235 Tel 12-39476891 E-mail: [EMAIL PROTECTED]
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