libsodium/test/default/secretbox_easy2.c

#define TEST_NAME "secretbox_easy2"
#include "cmptest.h"

int
main(void)
{
    unsigned char *m;
    unsigned char *m2;
    unsigned char *c;
    unsigned char *nonce;
    unsigned char *k;
    unsigned char *mac;
    size_t         mlen;
    size_t         i;

    mlen  = (size_t) randombytes_uniform((uint32_t) 10000) + 1U;
    m     = (unsigned char *) sodium_malloc(mlen);
    m2    = (unsigned char *) sodium_malloc(mlen);
    c     = (unsigned char *) sodium_malloc(crypto_secretbox_MACBYTES + mlen);
    nonce = (unsigned char *) sodium_malloc(crypto_secretbox_NONCEBYTES);
    k     = (unsigned char *) sodium_malloc(crypto_secretbox_KEYBYTES);
    mac   = (unsigned char *) sodium_malloc(crypto_secretbox_MACBYTES);
    crypto_secretbox_keygen(k);
    randombytes_buf(m, mlen);
    randombytes_buf(nonce, crypto_secretbox_NONCEBYTES);
    crypto_secretbox_easy(c, m, (unsigned long long) mlen, nonce, k);
    if (crypto_secretbox_open_easy(
            m2, c, (unsigned long long) mlen + crypto_secretbox_MACBYTES, nonce,
            k) != 0) {
        printf("crypto_secretbox_open_easy() failed\n");
    }
    printf("%d\n", memcmp(m, m2, mlen));

    for (i = 0; i < mlen + crypto_secretbox_MACBYTES - 1; i++) {
        if (crypto_secretbox_open_easy(m2, c, (unsigned long long) i, nonce,
                                       k) == 0) {
            printf("short open() should have failed\n");
            return 1;
        }
    }
    crypto_secretbox_detached(c, mac, m, (unsigned long long) mlen, nonce, k);
    if (crypto_secretbox_open_detached(NULL, c, mac, (unsigned long long) mlen,
                                       nonce, k) != 0) {
        printf("crypto_secretbox_open_detached() with a NULL message pointer failed\n");
    }
    if (crypto_secretbox_open_detached(m2, c, mac, (unsigned long long) mlen,
                                       nonce, k) != 0) {
        printf("crypto_secretbox_open_detached() failed\n");
    }
    printf("%d\n", memcmp(m, m2, mlen));

    memcpy(c, m, mlen);
    crypto_secretbox_easy(c, c, (unsigned long long) mlen, nonce, k);
    printf("%d\n", memcmp(m, c, mlen) == 0);
    printf("%d\n", memcmp(m, c + crypto_secretbox_MACBYTES, mlen) == 0);
    if (crypto_secretbox_open_easy(
            c, c, (unsigned long long) mlen + crypto_secretbox_MACBYTES, nonce,
            k) != 0) {
        printf("crypto_secretbox_open_easy() failed\n");
    }
    printf("%d\n", memcmp(m, c, mlen));

    sodium_free(m);
    sodium_free(m2);
    sodium_free(c);
    sodium_free(nonce);
    sodium_free(k);
    sodium_free(mac);

    return 0;
}