void encrypt(const char *fileIn, const char *fileOut,
const unsigned char *key) {
int i;
aes_encrypt_ctx ctx[1];
unsigned char iv[16]; /* initialisation vector */
unsigned char inBuffer[200], outBuffer[200];
FILE *inFile = fopen(fileIn, "rb");
FILE *outFile = fopen(fileOut, "wb");
/* pick a random initialisation vector */
for(i = 0; i < 16; ++i)
iv[i] = rand() & 0xFF;
fwrite(iv, 1, 16, outFile);
aes_encrypt_key256(key, ctx);
while((i = fread(inBuffer, 1, sizeof(inBuffer), inFile)) > 0) {
aes_ofb_crypt(inBuffer, outBuffer, i, iv, ctx);
fwrite(outBuffer, 1, i, outFile);
}
aes_ofb_crypt(inBuffer, outBuffer, i, iv, ctx);
fwrite(outBuffer, 1, i, outFile);
fclose(inFile);
fclose(outFile);
}
void decrypt(const char *fileIn, const char *fileOut,
const unsigned char *key) {
int i;
aes_encrypt_ctx ctx[1];
unsigned char iv[16]; /* initialisation vector */
unsigned char inBuffer[200], outBuffer[200];
FILE *inFile = fopen(fileIn, "rb");
FILE *outFile = fopen(fileOut, "wb");
/* read initialization vector from file */
if(fread(iv, 1, 16, inFile) < 16)
return; /* error: file doesn't even contain an initialisation vector */
aes_encrypt_key256(key, ctx);
while((i = fread(inBuffer, 1, sizeof(inBuffer), inFile)) > 0) {
aes_ofb_crypt(inBuffer, outBuffer, i, iv, ctx);
fwrite(outBuffer, 1, i, outFile);
}
fclose(inFile);
fclose(outFile);
}
void decrypt(const char *path, const unsigned char *key) {
int i;
aes_encrypt_ctx ctx[1];
unsigned char iv[16];
unsigned char temp_name[50];
unsigned char inBuffer[200], outBuffer[200];
sprintf(temp_name, "%s.tmp", path);
FILE *dfile = fopen(path, "rb");
FILE *ofile = fopen(temp_name, "wb");
if (dfile != NULL) {
printf("File.\n");
fflush(stdout);
} else {
return;
}
if (fread(iv, 1, 16, dfile) < 16) {
printf("Decryption error.\n");
fclose(dfile);
fclose(ofile);
return;
}
aes_encrypt_key256(key, ctx);
while ((i = fread(inBuffer, 1, sizeof(inBuffer), dfile)) > 0) {
aes_ofb_crypt(inBuffer, outBuffer, i, iv, ctx);
fwrite(outBuffer, 1, i, ofile);
}
fclose(dfile);
fclose(ofile);
if (remove(path) != 0)
printf("Error removing encrypted file.\n");
if (rename(temp_name, path) != 0)
printf("Error renaming file.\n");
}
void encrypt(const char *path, const unsigned char *key) {
int i;
aes_encrypt_ctx ctx[1];
unsigned char iv[16];
unsigned char temp_name[50];
unsigned char inBuffer[200], outBuffer[200];
FILE *dfile;
FILE *ofile;
sprintf(temp_name, "%s.tmp", path);
dfile = fopen(path, "rb");
ofile = fopen(temp_name, "wb");
if (dfile != NULL) {
printf("File.\n");
fflush(stdout);
} else {
return;
}
for (i = 0; i < 16; ++i)
iv[i] = rand() & 0xFF;
fwrite(iv, 1, 16, ofile);
aes_encrypt_key256(key, ctx);
while ((i = fread(inBuffer, 1, sizeof(inBuffer), dfile)) > 0) {
aes_ofb_crypt(inBuffer, outBuffer, i, iv, ctx);
fwrite(outBuffer, 1, i, ofile);
}
fclose(dfile);
fclose(ofile);
if (remove(path) != 0)
printf("Error removing infile.\n");
if (rename(temp_name, path) != 0)
printf("Error renaming file.\n");
}
