I'm using the CodeBlocks IDE for testing the following know example of OpenSLL.
#include <openssl/conf.h>
#include <openssl/evp.h>
#include <openssl/err.h>
#include <string.h>
int main(int arc, char *argv[])
{
/* Set up the key and iv. Do I need to say to not hard code these in a
* real application? :-)
*/
/* A 256 bit key */
unsigned char *key = "01234567890123456789012345678901";
/* A 128 bit IV */
unsigned char *iv = "01234567890123456";
/* Message to be encrypted */
unsigned char *plaintext =
"The quick brown fox jumps over the lazy dog";
/* Buffer for ciphertext. Ensure the buffer is long enough for the
* ciphertext which may be longer than the plaintext, dependant on the
* algorithm and mode
*/
unsigned char ciphertext[128];
/* Buffer for the decrypted text */
unsigned char decryptedtext[128];
int decryptedtext_len, ciphertext_len;
/* Initialise the library */
ERR_load_crypto_strings();
OpenSSL_add_all_algorithms();
OPENSSL_config(NULL);
/* Encrypt the plaintext */
ciphertext_len = encrypt(plaintext, strlen(plaintext), key, iv,ciphertext);
/* Do something useful with the ciphertext here */
printf("Ciphertext is:\n");
BIO_dump_fp(stdout, ciphertext, ciphertext_len);
/* Decrypt the ciphertext */
decryptedtext_len = decrypt(ciphertext, ciphertext_len, key, iv,decryptedtext);
/* Add a NULL terminator. We are expecting printable text */
decryptedtext[decryptedtext_len] = '\0';
/* Show the decrypted text */
printf("Decrypted text is:\n");
printf("%s\n", decryptedtext);
/* Clean up */
EVP_cleanup();
ERR_free_strings();
return 0;
}
I have already compile and installed the latest Openssl libraries and linked to my project.
/usr/local/ssl/lib/libcrypto.a
/usr/local/ssl/lib/libssl.a
/lib/x86_64-linux-gnu/libdl-2.19.so
However, when I compile my project I always receive the following errors:
||=== Build: Release in CryptoProject (compiler: GNU GCC Compiler) ===|
obj/Release/main.o||In function `main':|
main.c:(.text.startup+0x46)||undefined reference to `encrypt'|
main.c:(.text.startup+0x81)||undefined reference to `decrypt'|
||=== Build failed: 2 error(s), 0 warning(s) (0 minute(s), 0 second(s)) ===|
Am I missing some libraries to my project? Please Help!
