#include <openssl/conf.h>
#include <openssl/evp.h>
#include <openssl/bio.h>
#include <openssl/err.h>

int handleErrors() 
{
	ERR_print_errors_fp(stderr);
	abort();
}

int do_crypt(FILE *in, FILE *out, int do_encrypt)
{
	unsigned char inbuf[1024], outbuf[1024 + EVP_MAX_BLOCK_LENGTH];
	int inlen, outlen;
	EVP_CIPHER_CTX *ctx;

	unsigned char key[] = "YELLOW SUBMARINE";

	ctx = EVP_CIPHER_CTX_new();

	EVP_CipherInit_ex(ctx, EVP_aes_128_ecb(), NULL, NULL, NULL, do_encrypt);

	EVP_CipherInit_ex(ctx, NULL, NULL, key, NULL, do_encrypt);

	for(;;) {
		inlen = fread(inbuf, 1, 1024, in);
		if (inlen <= 0)
			break;

		if(!EVP_CipherUpdate(ctx, outbuf, &outlen, inbuf, inlen)) {
			EVP_CIPHER_CTX_free(ctx);
			return 0;
		}

		fwrite(outbuf, 1, outlen, out);
	}

	if(!EVP_CipherFinal_ex(ctx, outbuf, &outlen)) {
		EVP_CIPHER_CTX_free(ctx);
		return 0;
	}

	fwrite(outbuf, 1, outlen, out);

	EVP_CIPHER_CTX_free(ctx);
	return 1;
}

int main(int argc, char **argv)
{
	ERR_load_crypto_strings();

	OpenSSL_add_all_algorithms();

	OPENSSL_config(NULL);


	FILE *in;
	FILE *out;

	in = fopen("7unbased.txt", "r");
	out = fopen ("7cleartext.txt", "w");

	if ( in == NULL) {
		printf("error in\n");
		return 1;
	}

	if (out == NULL) {
		printf("error out\n");
		return 1;
	}

	do_crypt(in, out, 0);


	EVP_cleanup();

	CRYPTO_cleanup_all_ex_data();

	ERR_free_strings();

	return 0;
}