encrypt.c

#include <stdio.h>
#include <string.h>
#include "api.h"
#include "isap.h"

int crypto_aead_encrypt(
	unsigned char *c,unsigned long long *clen,
	const unsigned char *m,unsigned long long mlen,
	const unsigned char *ad,unsigned long long adlen,
	const unsigned char *nsec,
	const unsigned char *npub,
	const unsigned char *k
){
    // Ciphertext length is mlen + tag length
    *clen = mlen+ISAP_TAG_SZ;

    // Encrypt plaintext
    isap_enc(k,npub,m,mlen,c);

    // Generate tag
    unsigned char *tag = c+mlen;
    isap_mac(k,npub,ad,adlen,c,mlen,tag);
    return 0;
}