Create an encryption state structure using the encryption context.
void mco_crypt_init_state(mco_crypt_ctx_t const* crypt_ctx, mco_crypt_state_t* state);
| crypt_ctx | The address of the encryption context to initialize |
| state | The address of the encryption state structure |
This function creates an encryption state structure using the pre-initialized encryption context. This state, used by function mco_crypt_stream(), reflects the encryption process at current location of a stream.
| void | No value returned |
The following code snippet demonstrates encrypting / decrypting an external file:
/* Code sample for stream-based encryption */
FILE *fin, *fout;
char buff[100];
const int buff_size = sizeof(buff);
const char *cipher = "my cipher key";
mco_crypt_ctx_t crypt_ctx;
mco_crypt_state_t crypt_state;
size_t n;
mco_crypt_init_ctx(&crypt_ctx, cipher);
mco_crypt_init_state(&crypt_ctx, &crypt_state);
fin = fopen("unencrypted.file", "rb");
fout = fopen("encrypted.file", "wb");
do
{
n = fread(buff, buff_size, 1, fin);
mco_crypt_stream(&crypt_ctx, &crypt_state, buff, (uint4)n);
fwrite(buff, n, 1, fout);
} while (n == buff_size);
fclose(fin);
fclose(fout);