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/* BEGIN_HEADER */
#include "mbedtls/hkdf.h"
#include "mbedtls/md_internal.h"
/* END_HEADER */
/* BEGIN_DEPENDENCIES
* depends_on:MBEDTLS_HKDF_C
* END_DEPENDENCIES
*/
/* BEGIN_CASE */
void test_hkdf( int md_alg, char *hex_ikm_string, char *hex_salt_string,
char *hex_info_string, char *hex_okm_string )
{
int ret;
size_t ikm_len, salt_len, info_len, okm_len;
unsigned char ikm[128] = { '\0' };
unsigned char salt[128] = { '\0' };
unsigned char info[128] = { '\0' };
unsigned char expected_okm[128] = { '\0' };
unsigned char okm[128] = { '\0' };
/*
* okm_hex is the string representation of okm,
* so its size is twice the size of okm, and an extra null-termination.
*/
unsigned char okm_hex[257] = { '\0' };
const mbedtls_md_info_t *md = mbedtls_md_info_from_type( md_alg );
TEST_ASSERT( md != NULL );
ikm_len = unhexify( ikm, hex_ikm_string );
salt_len = unhexify( salt, hex_salt_string );
info_len = unhexify( info, hex_info_string );
okm_len = unhexify( expected_okm, hex_okm_string );
ret = mbedtls_hkdf( md, salt, salt_len, ikm, ikm_len, info, info_len, okm,
okm_len);
TEST_ASSERT( ret == 0 );
// Run hexify on it so that it looks nicer if the assertion fails
hexify( okm_hex, okm, okm_len );
TEST_ASSERT( !strcmp( (char *)okm_hex, hex_okm_string ) );
}
/* END_CASE */
/* BEGIN_CASE */
void test_hkdf_extract( int md_alg, char *hex_ikm_string,
char *hex_salt_string, char *hex_prk_string )
{
int ret;
unsigned char *ikm = NULL;
unsigned char *salt = NULL;
unsigned char *prk = NULL;
unsigned char *output_prk = NULL;
size_t ikm_len, salt_len, prk_len, 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 );
output_prk = mbedtls_calloc( 1, output_prk_len );
ikm = unhexify_alloc( hex_ikm_string, &ikm_len );
salt = unhexify_alloc( hex_salt_string, &salt_len );
prk = unhexify_alloc( hex_prk_string, &prk_len );
TEST_ASSERT( prk_len == output_prk_len );
ret = mbedtls_hkdf_extract( md, salt, salt_len, ikm, ikm_len, output_prk );
TEST_ASSERT( ret == 0 );
TEST_ASSERT( !memcmp( output_prk, prk, prk_len ) );
exit:
mbedtls_free(ikm);
mbedtls_free(salt);
mbedtls_free(prk);
mbedtls_free(output_prk);
}
/* END_CASE */
/* BEGIN_CASE */
void test_hkdf_expand( int md_alg, char *hex_info_string,
char *hex_prk_string, char *hex_okm_string )
{
enum { OKM_LEN = 1024 };
int ret;
unsigned char *info = NULL;
unsigned char *prk = NULL;
unsigned char *okm = NULL;
unsigned char *output_okm = NULL;
size_t info_len, prk_len, okm_len;
const mbedtls_md_info_t *md = mbedtls_md_info_from_type( md_alg );
TEST_ASSERT( md != NULL );
output_okm = mbedtls_calloc( OKM_LEN, 1 );
prk = unhexify_alloc( hex_prk_string, &prk_len );
info = unhexify_alloc( hex_info_string, &info_len );
okm = unhexify_alloc( hex_okm_string, &okm_len );
TEST_ASSERT( prk_len == mbedtls_md_get_size( md ) );
TEST_ASSERT( okm_len < OKM_LEN );
ret = mbedtls_hkdf_expand( md, prk, prk_len, info, info_len,
output_okm, OKM_LEN );
TEST_ASSERT( ret == 0 );
TEST_ASSERT( !memcmp( output_okm, okm, okm_len ) );
exit:
mbedtls_free(info);
mbedtls_free(prk);
mbedtls_free(okm);
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;
prk = mbedtls_calloc( MBEDTLS_MD_MAX_SIZE, 1 );
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)
prk = mbedtls_calloc( prk_len, 1 );
if (okm_len > 0)
okm = mbedtls_calloc( okm_len, 1 );
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 */
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