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#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;
}
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