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/* BEGIN_HEADER */
#include "pk_internal.h"
#include "mbedtls/pem.h"
#include "mbedtls/oid.h"
#include "mbedtls/base64.h"
#include "psa/crypto_sizes.h"
typedef enum {
TEST_PEM,
TEST_DER
} pkwrite_file_format_t;
/* Helper function for removing "\r" chars from a buffer. */
static void fix_new_lines(unsigned char *in_str, size_t *len)
{
size_t chars_left;
unsigned int i;
for (i = 0; (i < *len) && (*len > 0); i++) {
if (in_str[i] == '\r') {
if (i < (*len - 1)) {
chars_left = *len - i - 1;
memmove(&in_str[i], &in_str[i+1], chars_left);
} else {
in_str[i] = '\0';
}
*len = *len - 1;
}
}
}
static int pk_write_any_key(mbedtls_pk_context *pk, unsigned char **p,
size_t *buf_len, int is_public_key, int is_der)
{
int ret = 0;
if (is_der) {
if (is_public_key) {
ret = mbedtls_pk_write_pubkey_der(pk, *p, *buf_len);
} else {
ret = mbedtls_pk_write_key_der(pk, *p, *buf_len);
}
if (ret <= 0) {
return ret;
}
*p = *p + *buf_len - ret;
*buf_len = ret;
} else {
#if defined(MBEDTLS_PEM_WRITE_C)
if (is_public_key) {
ret = mbedtls_pk_write_pubkey_pem(pk, *p, *buf_len);
} else {
ret = mbedtls_pk_write_key_pem(pk, *p, *buf_len);
}
if (ret != 0) {
return ret;
}
*buf_len = strlen((char *) *p) + 1; /* +1 takes the string terminator into account */
#else
return MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE;
#endif
}
return 0;
}
static void pk_write_check_common(char *key_file, int is_public_key, int is_der)
{
mbedtls_pk_context key;
mbedtls_pk_init(&key);
unsigned char *buf = NULL;
unsigned char *check_buf = NULL;
unsigned char *start_buf;
size_t buf_len, check_buf_len;
int expected_result;
#if defined(MBEDTLS_USE_PSA_CRYPTO)
mbedtls_svc_key_id_t opaque_id = MBEDTLS_SVC_KEY_ID_INIT;
psa_key_attributes_t key_attr = PSA_KEY_ATTRIBUTES_INIT;
#endif /* MBEDTLS_USE_PSA_CRYPTO */
USE_PSA_INIT();
/* Note: if mbedtls_pk_load_file() successfully reads the file, then
it also allocates check_buf, which should be freed on exit */
TEST_EQUAL(mbedtls_pk_load_file(key_file, &check_buf, &check_buf_len), 0);
TEST_ASSERT(check_buf_len > 0);
/* Windows' line ending is different from the Linux's one ("\r\n" vs "\n").
* Git treats PEM files as text, so when on Windows, it replaces new lines
* with "\r\n" on checkout.
* Unfortunately mbedtls_pk_load_file() loads files in binary format,
* while mbedtls_pk_write_pubkey_pem() goes through the I/O layer which
* uses "\n" for newlines in both Windows and Linux.
* Here we remove the extra "\r" so that "buf" and "check_buf" can be
* easily compared later. */
if (!is_der) {
fix_new_lines(check_buf, &check_buf_len);
}
TEST_ASSERT(check_buf_len > 0);
TEST_CALLOC(buf, check_buf_len);
if (is_public_key) {
TEST_EQUAL(mbedtls_pk_parse_public_keyfile(&key, key_file), 0);
} else {
TEST_EQUAL(mbedtls_pk_parse_keyfile(&key, key_file, NULL,
mbedtls_test_rnd_std_rand, NULL), 0);
}
start_buf = buf;
buf_len = check_buf_len;
if (is_der) {
expected_result = MBEDTLS_ERR_ASN1_BUF_TOO_SMALL;
} else {
expected_result = MBEDTLS_ERR_BASE64_BUFFER_TOO_SMALL;
}
/* Intentionally pass a wrong size for the provided output buffer and check
* that the writing functions fails as expected. */
for (size_t i = 1; i < buf_len; i++) {
TEST_EQUAL(pk_write_any_key(&key, &start_buf, &i, is_public_key,
is_der), expected_result);
}
TEST_EQUAL(pk_write_any_key(&key, &start_buf, &buf_len, is_public_key,
is_der), 0);
TEST_MEMORY_COMPARE(start_buf, buf_len, check_buf, check_buf_len);
#if defined(MBEDTLS_USE_PSA_CRYPTO)
/* Verify that pk_write works also for opaque private keys */
if (!is_public_key) {
memset(buf, 0, check_buf_len);
/* Turn the key PK context into an opaque one.
* Note: set some practical usage for the key to make get_psa_attributes() happy. */
TEST_EQUAL(mbedtls_pk_get_psa_attributes(&key, PSA_KEY_USAGE_SIGN_MESSAGE, &key_attr), 0);
TEST_EQUAL(mbedtls_pk_import_into_psa(&key, &key_attr, &opaque_id), 0);
mbedtls_pk_free(&key);
mbedtls_pk_init(&key);
TEST_EQUAL(mbedtls_pk_setup_opaque(&key, opaque_id), 0);
start_buf = buf;
buf_len = check_buf_len;
/* Intentionally pass a wrong size for the provided output buffer and check
* that the writing functions fails as expected. */
for (size_t i = 1; i < buf_len; i++) {
TEST_EQUAL(pk_write_any_key(&key, &start_buf, &i, is_public_key,
is_der), expected_result);
}
TEST_EQUAL(pk_write_any_key(&key, &start_buf, &buf_len, is_public_key,
is_der), 0);
TEST_MEMORY_COMPARE(start_buf, buf_len, check_buf, check_buf_len);
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */
exit:
#if defined(MBEDTLS_USE_PSA_CRYPTO)
psa_destroy_key(opaque_id);
#endif /* MBEDTLS_USE_PSA_CRYPTO */
mbedtls_free(buf);
mbedtls_free(check_buf);
mbedtls_pk_free(&key);
USE_PSA_DONE();
}
/* END_HEADER */
/* BEGIN_DEPENDENCIES
* depends_on:MBEDTLS_PK_PARSE_C:MBEDTLS_PK_WRITE_C:MBEDTLS_FS_IO
* END_DEPENDENCIES
*/
/* BEGIN_CASE */
void pk_write_pubkey_check(char *key_file, int is_der)
{
pk_write_check_common(key_file, 1, is_der);
goto exit; /* make the compiler happy */
}
/* END_CASE */
/* BEGIN_CASE */
void pk_write_key_check(char *key_file, int is_der)
{
pk_write_check_common(key_file, 0, is_der);
goto exit; /* make the compiler happy */
}
/* END_CASE */
/* BEGIN_CASE */
void pk_write_public_from_private(char *priv_key_file, char *pub_key_file)
{
mbedtls_pk_context priv_key;
uint8_t *derived_key_raw = NULL;
size_t derived_key_len = 0;
uint8_t *pub_key_raw = NULL;
size_t pub_key_len = 0;
#if defined(MBEDTLS_USE_PSA_CRYPTO)
mbedtls_svc_key_id_t opaque_key_id = MBEDTLS_SVC_KEY_ID_INIT;
psa_key_attributes_t key_attr = PSA_KEY_ATTRIBUTES_INIT;
#endif /* MBEDTLS_USE_PSA_CRYPTO */
mbedtls_pk_init(&priv_key);
USE_PSA_INIT();
TEST_EQUAL(mbedtls_pk_parse_keyfile(&priv_key, priv_key_file, NULL,
mbedtls_test_rnd_std_rand, NULL), 0);
TEST_EQUAL(mbedtls_pk_load_file(pub_key_file, &pub_key_raw,
&pub_key_len), 0);
derived_key_len = pub_key_len;
TEST_CALLOC(derived_key_raw, derived_key_len);
TEST_EQUAL(mbedtls_pk_write_pubkey_der(&priv_key, derived_key_raw,
derived_key_len), pub_key_len);
TEST_MEMORY_COMPARE(derived_key_raw, derived_key_len,
pub_key_raw, pub_key_len);
#if defined(MBEDTLS_USE_PSA_CRYPTO)
mbedtls_platform_zeroize(derived_key_raw, derived_key_len);
/* Turn the priv_key PK context into an opaque one. */
TEST_EQUAL(mbedtls_pk_get_psa_attributes(&priv_key, PSA_KEY_USAGE_SIGN_HASH, &key_attr), 0);
TEST_EQUAL(mbedtls_pk_import_into_psa(&priv_key, &key_attr, &opaque_key_id), 0);
mbedtls_pk_free(&priv_key);
mbedtls_pk_init(&priv_key);
TEST_EQUAL(mbedtls_pk_setup_opaque(&priv_key, opaque_key_id), 0);
TEST_EQUAL(mbedtls_pk_write_pubkey_der(&priv_key, derived_key_raw,
derived_key_len), pub_key_len);
TEST_MEMORY_COMPARE(derived_key_raw, derived_key_len,
pub_key_raw, pub_key_len);
#endif /* MBEDTLS_USE_PSA_CRYPTO */
exit:
#if defined(MBEDTLS_USE_PSA_CRYPTO)
psa_destroy_key(opaque_key_id);
#endif /* MBEDTLS_USE_PSA_CRYPTO */
mbedtls_free(derived_key_raw);
mbedtls_free(pub_key_raw);
mbedtls_pk_free(&priv_key);
USE_PSA_DONE();
}
/* END_CASE */
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