/* BEGIN_HEADER */
#include "mbedtls/hkdf.h"
#include "md_wrap.h"
/* END_HEADER */

/* BEGIN_DEPENDENCIES
 * depends_on:MBEDTLS_HKDF_C
 * END_DEPENDENCIES
 */

/* BEGIN_CASE */
void test_hkdf( int md_alg, data_t *ikm, data_t *salt, data_t *info,
                data_t *expected_okm )
{
    int ret;
    unsigned char okm[128] = { '\0' };

    const mbedtls_md_info_t *md = mbedtls_md_info_from_type( md_alg );
    TEST_ASSERT( md != NULL );

    TEST_ASSERT( expected_okm->len <= sizeof( okm ) );

    ret = mbedtls_hkdf( md, salt->x, salt->len, ikm->x, ikm->len,
                        info->x, info->len, okm, expected_okm->len );
    TEST_ASSERT( ret == 0 );

    ASSERT_COMPARE( okm            , expected_okm->len,
                    expected_okm->x, expected_okm->len );
}
/* END_CASE */

/* BEGIN_CASE */
void test_hkdf_extract( int md_alg,
                        data_t *ikm,
                        data_t *salt,
                        data_t *prk )
{
    int ret;
    unsigned char *output_prk = NULL;
    size_t output_prk_len;

    const mbedtls_md_info_t *md = mbedtls_md_info_from_type( md_alg );
    TEST_ASSERT( md != NULL );

    output_prk_len = mbedtls_md_get_size( md );
    ASSERT_ALLOC( output_prk, output_prk_len );

    ret = mbedtls_hkdf_extract( md, salt->x, salt->len,
                                ikm->x, ikm->len, output_prk );
    TEST_ASSERT( ret == 0 );

    ASSERT_COMPARE( output_prk, output_prk_len, prk->x, prk->len );

exit:
    mbedtls_free(output_prk);
}
/* END_CASE */

/* BEGIN_CASE */
void test_hkdf_expand( int md_alg,
                       data_t *info,
                       data_t *prk,
                       data_t *okm )
{
    enum { OKM_LEN  = 1024 };
    int ret;
    unsigned char *output_okm = NULL;

    const mbedtls_md_info_t *md = mbedtls_md_info_from_type( md_alg );
    TEST_ASSERT( md != NULL );

    ASSERT_ALLOC( output_okm, OKM_LEN );

    TEST_ASSERT( prk->len == mbedtls_md_get_size( md ) );
    TEST_ASSERT( okm->len < OKM_LEN );

    ret = mbedtls_hkdf_expand( md, prk->x, prk->len,
                               info->x, info->len,
                               output_okm, OKM_LEN );
    TEST_ASSERT( ret == 0 );
    ASSERT_COMPARE( output_okm, okm->len, okm->x, okm->len );

exit:
    mbedtls_free(output_okm);
}
/* END_CASE */

/* BEGIN_CASE */
void test_hkdf_extract_ret( int hash_len, int ret )
{
    int output_ret;
    unsigned char *salt = NULL;
    unsigned char *ikm = NULL;
    unsigned char *prk = NULL;
    size_t salt_len, ikm_len;
    struct mbedtls_md_info_t fake_md_info;

    memset( &fake_md_info, 0, sizeof( fake_md_info ) );
    fake_md_info.type = MBEDTLS_MD_NONE;
    fake_md_info.size = hash_len;

    ASSERT_ALLOC( prk, MBEDTLS_MD_MAX_SIZE);
    salt_len = 0;
    ikm_len = 0;

    output_ret = mbedtls_hkdf_extract( &fake_md_info, salt, salt_len,
                                       ikm, ikm_len, prk );
    TEST_ASSERT( output_ret == ret );

exit:
    mbedtls_free(prk);
}
/* END_CASE */

/* BEGIN_CASE */
void test_hkdf_expand_ret( int hash_len, int prk_len, int okm_len, int ret )
{
    int output_ret;
    unsigned char *info = NULL;
    unsigned char *prk = NULL;
    unsigned char *okm = NULL;
    size_t info_len;
    struct mbedtls_md_info_t fake_md_info;

    memset( &fake_md_info, 0, sizeof( fake_md_info ) );
    fake_md_info.type = MBEDTLS_MD_NONE;
    fake_md_info.size = hash_len;

    info_len = 0;

    if (prk_len > 0)
        ASSERT_ALLOC( prk, prk_len );

    if (okm_len > 0)
        ASSERT_ALLOC( okm, okm_len );

    output_ret = mbedtls_hkdf_expand( &fake_md_info, prk, prk_len,
                                      info, info_len, okm, okm_len );
    TEST_ASSERT( output_ret == ret );

exit:
    mbedtls_free(prk);
    mbedtls_free(okm);
}
/* END_CASE */