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ec_self_tests_core.c
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/*
* Copyright (C) 2017 - This file is part of libecc project
*
* Authors:
* Ryad BENADJILA <[email protected]>
* Arnaud EBALARD <[email protected]>
* Jean-Pierre FLORI <[email protected]>
*
* Contributors:
* Nicolas VIVET <[email protected]>
* Karim KHALFALLAH <[email protected]>
*
* This software is licensed under a dual BSD and GPL v2 license.
* See LICENSE file at the root folder of the project.
*/
#include "ec_self_tests_core.h"
#include "../utils/utils.h"
#include "../external_deps/rand.h"
#include "../external_deps/time.h"
#include "../external_deps/print.h"
ATTRIBUTE_WARN_UNUSED_RET static int ec_gen_import_export_kp(ec_key_pair *kp, const ec_params *params,
const ec_test_case *c)
{
u8 pub_key_buf[EC_STRUCTURED_PUB_KEY_MAX_EXPORT_SIZE];
u8 priv_key_buf[EC_STRUCTURED_PRIV_KEY_MAX_EXPORT_SIZE];
u8 pub_key_buf_len, priv_key_buf_len;
ec_key_pair imported_kp;
int ret;
MUST_HAVE(c != NULL, ret, err);
ret = local_memset(pub_key_buf, 0, sizeof(pub_key_buf)); EG(ret, err);
ret = local_memset(priv_key_buf, 0, sizeof(priv_key_buf)); EG(ret, err);
ret = local_memset(&imported_kp, 0, sizeof(imported_kp)); EG(ret, err);
/* Generate key pair */
ret = ec_key_pair_gen(kp, params, c->sig_type);
if (ret) {
ext_printf("Error generating key pair\n");
goto err;
}
pub_key_buf_len = EC_STRUCTURED_PUB_KEY_EXPORT_SIZE(&(kp->pub_key));
priv_key_buf_len = EC_STRUCTURED_PRIV_KEY_EXPORT_SIZE(&(kp->priv_key));
/* Export public and private keys in buffers */
ret = ec_structured_pub_key_export_to_buf(&(kp->pub_key), pub_key_buf,
pub_key_buf_len);
if (ret) {
ext_printf("Error exporting public key\n");
goto err;
}
ret = ec_structured_priv_key_export_to_buf(&(kp->priv_key),
priv_key_buf,
priv_key_buf_len);
if (ret) {
ext_printf("Error exporting private key\n");
goto err;
}
/* Import public and private key */
ret = ec_structured_pub_key_import_from_buf(&(imported_kp.pub_key),
params,
pub_key_buf,
pub_key_buf_len,
c->sig_type);
if (ret) {
ext_printf("Error importing public key\n");
goto err;
}
ret = ec_structured_priv_key_import_from_buf(&(imported_kp.priv_key),
params, priv_key_buf,
priv_key_buf_len,
c->sig_type);
if (ret) {
ext_printf("Error importing private key\n");
goto err;
}
ret = 0;
err:
return ret;
}
/* This function randomly splits the message input in small chunks to
* test the signature init / multiple updates / finalize mechanism for
* algorithms that support them.
*/
ATTRIBUTE_WARN_UNUSED_RET static int random_split_ec_sign(u8 *sig, u8 siglen, const ec_key_pair *key_pair,
const u8 *m, u32 mlen,
int (*rand) (nn_t out, nn_src_t q),
ec_alg_type sig_type, hash_alg_type hash_type, const u8 *adata, u16 adata_len)
{
struct ec_sign_context ctx;
int ret;
u32 consumed;
ret = local_memset(&ctx, 0, sizeof(ctx)); EG(ret, err);
MUST_HAVE(sig != NULL, ret, err);
MUST_HAVE(key_pair != NULL, ret, err);
MUST_HAVE(m != NULL, ret, err);
/* note: adata == NULL is allowed */
ret = _ec_sign_init(&ctx, key_pair, rand, sig_type, hash_type, adata, adata_len);
if (ret) {
goto err;
}
/* We randomly split the input message in chunks and proceed with updates */
consumed = 0;
while(consumed < mlen){
u32 toconsume = 0;
ret = get_random((u8 *)&toconsume, sizeof(toconsume));
if (ret) {
ext_printf("Error when getting random\n");
goto err;
}
toconsume = (toconsume % (mlen - consumed));
if(((mlen - consumed) == 1) && (toconsume == 0)){
toconsume = 1;
}
ret = ec_sign_update(&ctx, &m[consumed], toconsume);
if (ret) {
goto err;
}
consumed += toconsume;
}
ret = ec_sign_finalize(&ctx, sig, siglen);
err:
return ret;
}
/* This function randomly splits the message input in small chunks to
* test the verification init / multiple updates / finalize mechanism for
* algorithms that support them.
*/
ATTRIBUTE_WARN_UNUSED_RET static int random_split_ec_verify(const u8 *sig, u8 siglen, const ec_pub_key *pub_key,
const u8 *m, u32 mlen,
ec_alg_type sig_type, hash_alg_type hash_type, const u8 *adata, u16 adata_len)
{
int ret;
struct ec_verify_context ctx;
u32 consumed;
ret = local_memset(&ctx, 0, sizeof(ctx)); EG(ret, err);
ret = ec_verify_init(&ctx, pub_key, sig, siglen, sig_type, hash_type, adata, adata_len);
if (ret) {
goto err;
}
/* We randomly split the input message in chunks and proceed with updates */
consumed = 0;
while(consumed < mlen){
u32 toconsume = 0;
ret = get_random((u8 *)&toconsume, sizeof(toconsume));
if (ret) {
ext_printf("Error when getting random\n");
goto err;
}
toconsume = (toconsume % (mlen - consumed));
if(((mlen - consumed) == 1) && (toconsume == 0)){
toconsume = 1;
}
ret = ec_verify_update(&ctx, &m[consumed], toconsume);
if (ret) {
goto err;
}
consumed += toconsume;
}
ret = ec_verify_finalize(&ctx);
err:
return ret;
}
/* Reduce pressure on the stack for small targets
* by letting the user override this value.
*/
#ifndef MAX_MSG_LEN
#define MAX_MSG_LEN 8192
#endif
/*
* ECC generic self tests (sign/verify on random values
* with import/export)
*/
ATTRIBUTE_WARN_UNUSED_RET static int ec_import_export_test(const ec_test_case *c)
{
ec_key_pair kp;
ec_params params;
int ret, check;
MUST_HAVE(c != NULL, ret, err);
ret = local_memset(&kp, 0, sizeof(kp)); EG(ret, err);
ret = local_memset(¶ms, 0, sizeof(params)); EG(ret, err);
/* Import EC params from test case */
ret = import_params(¶ms, c->ec_str_p);
if (ret) {
ext_printf("Error importing params\n");
goto err;
}
/* Generate, import/export a key pair */
ret = ec_gen_import_export_kp(&kp, ¶ms, c);
if (ret) {
ext_printf("Error at key pair generation/import/export\n");
goto err;
}
/* Perform test */
{
u16 msglen;
u8 siglen;
u8 msg[MAX_MSG_LEN];
u8 sig[EC_MAX_SIGLEN];
u8 check_type = 0;
u8 sig_tmp1[EC_MAX_SIGLEN];
u8 sig_tmp2[EC_MAX_SIGLEN];
FORCE_USED_VAR(check_type);
ret = ec_get_sig_len(¶ms, c->sig_type, c->hash_type,
(u8 *)&siglen);
if (ret) {
ext_printf("Error computing effective sig size\n");
goto err;
}
/* Generate a random message to sign */
ret = get_random((u8 *)&msglen, sizeof(msglen));
if (ret) {
ext_printf("Error when getting random\n");
goto err;
}
msglen = msglen % MAX_MSG_LEN;
ret = get_random(msg, msglen);
if (ret) {
ext_printf("Error when getting random\n");
goto err;
}
ret = _ec_sign(sig, siglen, &kp, msg, msglen,
c->nn_random, c->sig_type, c->hash_type, c->adata, c->adata_len);
if (ret) {
ext_printf("Error when signing\n");
goto err;
}
ret = local_memset(sig_tmp1, 0, sizeof(sig_tmp1)); EG(ret, err);
ret = local_memset(sig_tmp2, 0, sizeof(sig_tmp2)); EG(ret, err);
/* If the algorithm supports streaming mode, test it against direct mode */
ret = is_sign_streaming_mode_supported(c->sig_type, &check); EG(ret, err);
if(check){
MUST_HAVE(siglen <= LOCAL_MAX(sizeof(sig_tmp1), sizeof(sig_tmp2)), ret, err);
ret = generic_ec_sign(sig_tmp1, siglen, &kp, msg, msglen,
c->nn_random, c->sig_type, c->hash_type, c->adata, c->adata_len);
if(ret){
ext_printf("Error when signing\n");
ret = -1;
goto err;
}
ret = random_split_ec_sign(sig_tmp2, siglen, &kp, msg, msglen,
c->nn_random, c->sig_type, c->hash_type, c->adata, c->adata_len);
if(ret){
ext_printf("Error when signing\n");
ret = -1;
goto err;
}
/* Verify signature equality only in case of deterministic signatures */
ret = is_sign_deterministic(c->sig_type, &check); EG(ret, err);
if(check){
ret = are_equal(sig, sig_tmp1, siglen, &check); EG(ret, err);
if(!check){
ext_printf("Error when signing: streaming and non streaming modes results differ "\
"for deterministic signature scheme!\n");
ret = -1;
goto err;
}
ret = are_equal(sig, sig_tmp2, siglen, &check); EG(ret, err);
if(!check){
ext_printf("Error when signing: streaming and non streaming modes results differ "\
"for deterministic signature scheme!\n");
ret = -1;
goto err;
}
}
}
ret = ec_verify(sig, siglen, &(kp.pub_key), msg, msglen,
c->sig_type, c->hash_type, c->adata, c->adata_len);
if (ret) {
ext_printf("Error when verifying signature\n");
goto err;
}
/* If the algorithm supports streaming mode, test it against direct mode */
ret = is_verify_streaming_mode_supported(c->sig_type, &check); EG(ret, err);
if(check){
ret = is_sign_streaming_mode_supported(c->sig_type, &check); EG(ret, err);
if(check){
ret = generic_ec_verify(sig_tmp2, siglen, &(kp.pub_key), msg, msglen,
c->sig_type, c->hash_type, c->adata, c->adata_len);
}
else{
ret = generic_ec_verify(sig, siglen, &(kp.pub_key), msg, msglen,
c->sig_type, c->hash_type, c->adata, c->adata_len);
}
if (ret) {
ext_printf("Error when verifying signature generic_ec_verify\n");
goto err;
}
ret = is_sign_streaming_mode_supported(c->sig_type, &check); EG(ret, err);
if(check){
ret = random_split_ec_verify(sig_tmp1, siglen, &(kp.pub_key), msg, msglen,
c->sig_type, c->hash_type, c->adata, c->adata_len);
}
else{
ret = random_split_ec_verify(sig, siglen, &(kp.pub_key), msg, msglen,
c->sig_type, c->hash_type, c->adata, c->adata_len);
}
if (ret) {
ext_printf("Error when verifying signature random_split_ec_verify\n");
goto err;
}
}
check_type = 0;
#if defined(WITH_SIG_ECDSA)
if(c->sig_type == ECDSA){
check_type = 1;
}
#endif
#if defined(WITH_SIG_DECDSA)
if(c->sig_type == DECDSA){
check_type = 1;
}
#endif
/* Try a public key recovery from the signature and the message.
* This is only possible for ECDSA.
*/
if(check_type){
struct ec_sign_context sig_ctx;
u8 digest[MAX_DIGEST_SIZE] = { 0 };
u8 digestlen;
ec_pub_key pub_key1;
ec_pub_key pub_key2;
nn_src_t cofactor = &(params.ec_gen_cofactor);
int cofactorisone;
const u8 *input[2] = { (const u8*)msg , NULL};
u32 ilens[2] = { msglen , 0 };
/* Initialize our signature context only for the hash */
ret = ec_sign_init(&sig_ctx, &kp, c->sig_type, c->hash_type, c->adata, c->adata_len); EG(ret, err);
/* Perform the hash of the data ourselves */
ret = hash_mapping_callbacks_sanity_check(sig_ctx.h); EG(ret, err);
ret = sig_ctx.h->hfunc_scattered(input, ilens, digest); EG(ret, err);
digestlen = sig_ctx.h->digest_size;
MUST_HAVE(digestlen <= sizeof(digest), ret, err);
/* Check the cofactor */
ret = nn_isone(cofactor, &cofactorisone); EG(ret, err);
/* Compute the two possible public keys */
ret = __ecdsa_public_key_from_sig(&pub_key1, &pub_key2, ¶ms, sig, siglen, digest, digestlen, c->sig_type);
if(ret){
ret = 0;
check = -1;
goto pubkey_recovery_warning;
}
/* Check equality with one of the two keys */
ret = prj_pt_cmp(&(pub_key1.y), &(kp.pub_key.y), &check); EG(ret, err);
if(check){
ret = prj_pt_cmp(&(pub_key2.y), &(kp.pub_key.y), &check); EG(ret, err);
}
pubkey_recovery_warning:
if(check && cofactorisone){
ext_printf("[~] Warning: ECDSA recovered public key differs from real one ...");
ext_printf("This can happen with very low probability. Please check the trace:\n");
pub_key_print("pub_key1", &pub_key1);
pub_key_print("pub_key2", &pub_key2);
pub_key_print("pub_key", &(kp.pub_key));
buf_print("digest", digest, digestlen);
buf_print("sig", sig, siglen);
}
}
#ifdef USE_CRYPTOFUZZ
check_type = 0;
/* Specific case where we have access to raw signature API */
#if defined(WITH_SIG_ECDSA)
if(c->sig_type == ECDSA){
check_type = 1;
}
#endif
#if defined(WITH_SIG_ECGDSA)
if(c->sig_type == ECGDSA){
check_type = 1;
}
#endif
#if defined(WITH_SIG_ECRDSA)
if(c->sig_type == ECRDSA){
check_type = 1;
}
#endif
if(check_type){
struct ec_sign_context sig_ctx;
struct ec_verify_context verif_ctx;
u8 digest[MAX_DIGEST_SIZE] = { 0 };
u8 digestlen;
const u8 *input[2] = { (const u8*)msg , NULL};
u32 ilens[2] = { msglen , 0 };
/* Initialize our signature context */
ret = ec_sign_init(&sig_ctx, &kp, c->sig_type, c->hash_type, c->adata, c->adata_len); EG(ret, err);
/* Perform the hash of the data ourselves */
ret = hash_mapping_callbacks_sanity_check(sig_ctx.h); EG(ret, err);
ret = sig_ctx.h->hfunc_scattered(input, ilens, digest); EG(ret, err);
digestlen = sig_ctx.h->digest_size;
MUST_HAVE(digestlen <= sizeof(digest), ret, err);
/* Raw signing of data */
#if defined(WITH_SIG_ECDSA)
if(c->sig_type == ECDSA){
ret = ecdsa_sign_raw(&sig_ctx, digest, digestlen, sig, siglen, NULL, 0); EG(ret, err);
}
#endif
#if defined(WITH_SIG_ECGDSA)
if(c->sig_type == ECGDSA){
ret = ecgdsa_sign_raw(&sig_ctx, digest, digestlen, sig, siglen, NULL, 0); EG(ret, err);
}
#endif
#if defined(WITH_SIG_ECRDSA)
if(c->sig_type == ECRDSA){
ret = ecrdsa_sign_raw(&sig_ctx, digest, digestlen, sig, siglen, NULL, 0); EG(ret, err);
}
#endif
/* Now verify signature */
ret = ec_verify_init(&verif_ctx, &(kp.pub_key), sig, siglen, c->sig_type, c->hash_type, c->adata, c->adata_len); EG(ret, err);
#if defined(WITH_SIG_ECDSA)
if(c->sig_type == ECDSA){
ret = ecdsa_verify_raw(&verif_ctx, digest, digestlen); EG(ret, err);
}
#endif
#if defined(WITH_SIG_ECGDSA)
if(c->sig_type == ECGDSA){
ret = ecgdsa_verify_raw(&verif_ctx, digest, digestlen); EG(ret, err);
}
#endif
#if defined(WITH_SIG_ECRDSA)
if(c->sig_type == ECRDSA){
ret = ecrdsa_verify_raw(&verif_ctx, digest, digestlen); EG(ret, err);
}
#endif
}
#endif
}
ret = 0;
err:
return ret;
}
/*
* Those functions respectively perform signature and verification tests
* based the content of a given test case.
*/
ATTRIBUTE_WARN_UNUSED_RET static int ec_test_sign(u8 *sig, u8 siglen, ec_key_pair *kp,
const ec_test_case *c)
{
/* If the algorithm supports streaming, we check that both the streaming and
* non streaming modes produce the same result.
*/
int ret, check;
MUST_HAVE(sig != NULL, ret, err);
MUST_HAVE(c != NULL, ret, err);
ret = _ec_sign(sig, siglen, kp, (const u8 *)(c->msg), c->msglen,
c->nn_random, c->sig_type, c->hash_type, c->adata, c->adata_len); EG(ret, err);
ret = is_sign_streaming_mode_supported(c->sig_type, &check); EG(ret, err);
if(check){
u8 sig_tmp[EC_MAX_SIGLEN];
MUST_HAVE(siglen <= sizeof(sig_tmp), ret, err);
ret = generic_ec_sign(sig_tmp, siglen, kp, (const u8 *)(c->msg), c->msglen,
c->nn_random, c->sig_type, c->hash_type, c->adata, c->adata_len); EG(ret, err);
ret = are_equal(sig, sig_tmp, siglen, &check); EG(ret, err);
if(!check){
ret = -1;
goto err;
}
/* Now test the random split version */
ret = random_split_ec_sign(sig_tmp, siglen, kp, (const u8 *)(c->msg), c->msglen,
c->nn_random, c->sig_type, c->hash_type, c->adata, c->adata_len); EG(ret, err);
ret = are_equal(sig, sig_tmp, siglen, &check); EG(ret, err);
if(!check){
ret = -1;
goto err;
}
}
ret = 0;
err:
return ret;
}
ATTRIBUTE_WARN_UNUSED_RET static int ec_test_verify(u8 *sig, u8 siglen, const ec_pub_key *pub_key,
const ec_test_case *c)
{
/* If the algorithm supports streaming, we check that both the streaming and
* non streaming modes produce the same result.
*/
int ret, check;
MUST_HAVE(sig != NULL, ret, err);
MUST_HAVE(c != NULL, ret, err);
ret = ec_verify(sig, siglen, pub_key, (const u8 *)(c->msg), c->msglen,
c->sig_type, c->hash_type, c->adata, c->adata_len);
if(ret){
ret = -1;
goto err;
}
ret = is_verify_streaming_mode_supported(c->sig_type, &check); EG(ret, err);
if(check){
ret = generic_ec_verify(sig, siglen, pub_key, (const u8 *)(c->msg), c->msglen,
c->sig_type, c->hash_type, c->adata, c->adata_len);
if(ret){
ret = -1;
goto err;
}
/* Now test the random split version */
ret = random_split_ec_verify(sig, siglen, pub_key, (const u8 *)(c->msg), c->msglen,
c->sig_type, c->hash_type, c->adata, c->adata_len);
if(ret){
ret = -1;
goto err;
}
}
ret = 0;
err:
return ret;
}
/*
* ECC generic self tests (sign/verify on known test vectors). Returns
* 0 if given test succeeded, or a non-zero value otherwise. In that
* case, the value encodes the information on what went wrong as
* described above.
*/
ATTRIBUTE_WARN_UNUSED_RET static int ec_sig_known_vector_tests_one(const ec_test_case *c)
{
test_err_kind failed_test = TEST_KEY_IMPORT_ERROR;
u8 sig[EC_MAX_SIGLEN];
ec_params params;
ec_key_pair kp;
u8 siglen;
int ret;
int check = 0;
MUST_HAVE((c != NULL), ret, err);
ret = local_memset(&kp, 0, sizeof(kp)); EG(ret, err);
ret = local_memset(¶ms, 0, sizeof(params)); EG(ret, err);
ret = local_memset(sig, 0, sizeof(sig)); EG(ret, err);
ret = import_params(¶ms, c->ec_str_p);
if (ret) {
ext_printf("Error importing params\n");
goto err;
}
#if defined(WITH_SIG_EDDSA25519) || defined(WITH_SIG_EDDSA448)
/* In the specific case of EdDSA, we perform a specific key derivation */
#if defined(WITH_SIG_EDDSA25519) && defined(WITH_SIG_EDDSA448)
if((c->sig_type == EDDSA25519) || (c->sig_type == EDDSA25519CTX) || (c->sig_type == EDDSA25519PH) || \
(c->sig_type == EDDSA448) || (c->sig_type == EDDSA448PH)){
#endif
#if defined(WITH_SIG_EDDSA25519) && !defined(WITH_SIG_EDDSA448)
if((c->sig_type == EDDSA25519) || (c->sig_type == EDDSA25519CTX) || (c->sig_type == EDDSA25519PH)){
#endif
#if !defined(WITH_SIG_EDDSA25519) && defined(WITH_SIG_EDDSA448)
if((c->sig_type == EDDSA448) || (c->sig_type == EDDSA448PH)){
#endif
/* Import the key pair using the EdDSA dedicated function */
if(eddsa_import_key_pair_from_priv_key_buf(&kp, c->priv_key, c->priv_key_len, ¶ms, c->sig_type)){
ret = -1;
failed_test = TEST_KEY_IMPORT_ERROR;
goto err;
}
}
else
#endif /* !(defined(WITH_SIG_EDDSA25519) || defined(WITH_SIG_EDDSA448)) */
{
/* Regular import if not EdDSA */
ret = ec_key_pair_import_from_priv_key_buf(&kp, ¶ms, c->priv_key,
c->priv_key_len,
c->sig_type);
if (ret) {
failed_test = TEST_KEY_IMPORT_ERROR;
goto err;
}
}
siglen = c->exp_siglen;
ret = ec_test_sign(sig, siglen, &kp, c);
if (ret) {
failed_test = TEST_SIG_ERROR;
goto err;
}
ret = are_equal(sig, c->exp_sig, siglen, &check); EG(ret, err);
if (!check) {
ret = -1;
failed_test = TEST_SIG_COMP_ERROR;
goto err;
}
ret = ec_test_verify(sig, siglen, &(kp.pub_key), c);
if (ret) {
failed_test = TEST_VERIF_ERROR;
goto err;
}
check = 0;
#if defined(WITH_SIG_ECDSA)
if(c->sig_type == ECDSA){
check = 1;
}
#endif
#if defined(WITH_SIG_DECDSA)
if(c->sig_type == DECDSA){
check = 1;
}
#endif
/* Try a public key recovery from the signature and the message.
* This is only possible for ECDSA.
*/
if(check){
struct ec_sign_context sig_ctx;
u8 digest[MAX_DIGEST_SIZE] = { 0 };
u8 digestlen;
ec_pub_key pub_key1;
ec_pub_key pub_key2;
nn_src_t cofactor = &(params.ec_gen_cofactor);
int cofactorisone;
const u8 *input[2] = { (const u8*)(c->msg) , NULL};
u32 ilens[2] = { c->msglen , 0 };
/* Initialize our signature context only for the hash */
ret = ec_sign_init(&sig_ctx, &kp, c->sig_type, c->hash_type, c->adata, c->adata_len); EG(ret, err);
/* Perform the hash of the data ourselves */
ret = hash_mapping_callbacks_sanity_check(sig_ctx.h); EG(ret, err);
ret = sig_ctx.h->hfunc_scattered(input, ilens, digest); EG(ret, err);
digestlen = sig_ctx.h->digest_size;
MUST_HAVE(digestlen <= sizeof(digest), ret, err);
/* Check the cofactor */
ret = nn_isone(cofactor, &cofactorisone); EG(ret, err);
/* Compute the two possible public keys */
ret = __ecdsa_public_key_from_sig(&pub_key1, &pub_key2, ¶ms, sig, siglen, digest, digestlen, c->sig_type);
if(ret){
ret = 0;
check = -1;
goto pubkey_recovery_warning;
}
/* Check equality with one of the two keys */
ret = prj_pt_cmp(&(pub_key1.y), &(kp.pub_key.y), &check); EG(ret, err);
if(check){
ret = prj_pt_cmp(&(pub_key2.y), &(kp.pub_key.y), &check); EG(ret, err);
}
pubkey_recovery_warning:
if(check && cofactorisone){
ext_printf("[~] Warning: ECDSA recovered public key differs from real one ...");
ext_printf("This can happen with very low probability. Please check the trace:\n");
pub_key_print("pub_key1", &pub_key1);
pub_key_print("pub_key2", &pub_key2);
pub_key_print("pub_key", &(kp.pub_key));
buf_print("digest", digest, digestlen);
buf_print("sig", sig, siglen);
}
}
#ifdef USE_CRYPTOFUZZ
check = 0;
/* Specific case where we have access to raw signature API */
#if defined(WITH_SIG_ECDSA)
if(c->sig_type == ECDSA){
check = 1;
}
#endif
#if defined(WITH_SIG_ECGDSA)
if(c->sig_type == ECGDSA){
check = 1;
}
#endif
#if defined(WITH_SIG_ECRDSA)
if(c->sig_type == ECRDSA){
check = 1;
}
#endif
/* Specific case where we have access to raw signature API */
if(check){
struct ec_sign_context sig_ctx;
struct ec_verify_context verif_ctx;
u8 digest[MAX_DIGEST_SIZE] = { 0 };
u8 digestlen;
const u8 *input[2] = { (const u8*)(c->msg) , NULL};
u32 ilens[2] = { c->msglen , 0 };
u8 nonce[LOCAL_MIN(255, BIT_LEN_WORDS(NN_MAX_BIT_LEN) * (WORDSIZE / 8))] = { 0 };
nn n_nonce;
bitcnt_t q_bit_len;
u8 noncelen;
/* Initialize our signature context */
if(ec_sign_init(&sig_ctx, &kp, c->sig_type, c->hash_type, c->adata, c->adata_len)){
ret = -1;
failed_test = TEST_SIG_ERROR;
goto err;
}
/* Perform the hash of the data ourselves */
if(hash_mapping_callbacks_sanity_check(sig_ctx.h)){
ret = -1;
failed_test = TEST_SIG_ERROR;
goto err;
}
ret = sig_ctx.h->hfunc_scattered(input, ilens, digest); EG(ret, err);
digestlen = sig_ctx.h->digest_size;
MUST_HAVE(digestlen <= sizeof(digest), ret, err);
/* Import the fixed nonce */
q_bit_len = kp.priv_key.params->ec_gen_order_bitlen;
if(c->nn_random(&n_nonce, &(kp.priv_key.params->ec_gen_order))){
ret = -1;
failed_test = TEST_SIG_ERROR;
goto err;
}
ret = nn_export_to_buf(nonce, (u16)BYTECEIL(q_bit_len), &n_nonce); EG(ret, err);
if((unsigned int)BYTECEIL(q_bit_len) > sizeof(nonce)){
ret = -1;
failed_test = TEST_SIG_ERROR;
goto err;
}
noncelen = (u8)(BYTECEIL(q_bit_len));
/* Force used variable to avoid warnings */
FORCE_USED_VAR(noncelen);
/* NOTE: the MUST_HAVE is protected by a preprocessing check
* to avoid -Werror=type-limits errors:
* "error: comparison is always true due to limited range of data type"
*/
#if LOCAL_MIN(255, BIT_LEN_WORDS(NN_MAX_BIT_LEN) * (WORDSIZE / 8)) < 255
MUST_HAVE((u32)noncelen <= sizeof(nonce), ret, err);
#endif
/* Raw signing of data */
#if defined(WITH_SIG_ECDSA)
if(c->sig_type == ECDSA){
if(ecdsa_sign_raw(&sig_ctx, digest, digestlen, sig, siglen, nonce, noncelen)){
ret = -1;
failed_test = TEST_SIG_ERROR;
goto err;
}
}
#endif
#if defined(WITH_SIG_ECGDSA)
if(c->sig_type == ECGDSA){
if(ecgdsa_sign_raw(&sig_ctx, digest, digestlen, sig, siglen, nonce, noncelen)){
ret = -1;
failed_test = TEST_SIG_ERROR;
goto err;
}
}
#endif
#if defined(WITH_SIG_ECRDSA)
if(c->sig_type == ECRDSA){
if(ecrdsa_sign_raw(&sig_ctx, digest, digestlen, sig, siglen, nonce, noncelen)){
ret = -1;
failed_test = TEST_SIG_ERROR;
goto err;
}
}
#endif
/* Check computed signature against expected one */
ret = are_equal(sig, c->exp_sig, siglen, &check); EG(ret, err);
if (!check) {
failed_test = TEST_SIG_COMP_ERROR;
ret = -1;
goto err;
}
/* Now verify signature */
if(ec_verify_init(&verif_ctx, &(kp.pub_key), sig, siglen, c->sig_type, c->hash_type, c->adata, c->adata_len)){
ret = -1;
failed_test = TEST_VERIF_ERROR;
goto err;
}
/* Raw verification of data */
#if defined(WITH_SIG_ECDSA)
if(c->sig_type == ECDSA){
if(ecdsa_verify_raw(&verif_ctx, digest, digestlen)){
ret = -1;
failed_test = TEST_VERIF_ERROR;
goto err;
}
}
#endif
#if defined(WITH_SIG_ECGDSA)
if(c->sig_type == ECGDSA){
if(ecgdsa_verify_raw(&verif_ctx, digest, digestlen)){
ret = -1;
failed_test = TEST_VERIF_ERROR;
goto err;
}
}
#endif
#if defined(WITH_SIG_ECRDSA)
if(c->sig_type == ECRDSA){
if(ecrdsa_verify_raw(&verif_ctx, digest, digestlen)){
ret = -1;
failed_test = TEST_VERIF_ERROR;
goto err;
}
}
#endif
}
#endif
ret = 0;
err:
if (ret) {
u32 ret_;
ret = encode_error_value(c, failed_test, &ret_); EG(ret, err);
ret = (int)ret_;
}
return ret;
}
#if defined(WITH_ECCCDH) || defined(WITH_X25519) || defined(WITH_X448)
/*
* ECC generic self tests (ecdh on known test vectors). Returns
* 0 if given test succeeded, or a non-zero value otherwise. In that
* case, the value encodes the information on what went wrong as
* described above.
*/
ATTRIBUTE_WARN_UNUSED_RET static int ecdh_known_vector_tests_one(const ecdh_test_case *c)
{
test_err_kind failed_test = TEST_KEY_IMPORT_ERROR;
ec_params params;
ec_key_pair kp;
int ret, check;
MUST_HAVE((c != NULL), ret, err);
ret = local_memset(&kp, 0, sizeof(kp)); EG(ret, err);
ret = local_memset(¶ms, 0, sizeof(params)); EG(ret, err);
ret = import_params(¶ms, c->ec_str_p);
if (ret) {
ext_printf("Error importing params\n");
goto err;
}
/* Check what ECDH test we have to perform */
switch(c->ecdh_type){
#if defined(WITH_ECCCDH)
case ECCCDH:{
u8 serialized_pub_key[EC_PUB_KEY_MAX_SIZE];
u8 serialized_pub_key_len;
/* This maximum size is way bigger than expected, but we ensure
* that there is enough room for our shared secret.
*/
u8 shared_secret[EC_PUB_KEY_MAX_SIZE];
u8 shared_secret_len;
ret = local_memset(serialized_pub_key, 0, sizeof(serialized_pub_key)); EG(ret, err);
ret = local_memset(shared_secret, 0, sizeof(shared_secret)); EG(ret, err);
/* Import our ECDH key pair */
ret = ecccdh_import_key_pair_from_priv_key_buf(&kp, ¶ms, c->our_priv_key,
c->our_priv_key_len);
if (ret) {
failed_test = TEST_KEY_IMPORT_ERROR;
ret = -1;
goto err;
}
/* Serialize our public key */
ret = ecccdh_serialized_pub_key_size(¶ms, &serialized_pub_key_len); EG(ret, err);
MUST_HAVE((sizeof(serialized_pub_key) >= serialized_pub_key_len), ret, err);
ret = ecccdh_serialize_pub_key(&(kp.pub_key), serialized_pub_key, serialized_pub_key_len);
if (ret) {
failed_test = TEST_ECDH_ERROR;
ret = -1;
goto err;
}
/* Check it against the expected one */
MUST_HAVE((serialized_pub_key_len == c->exp_our_pub_key_len), ret, err);
ret = are_equal(serialized_pub_key, c->exp_our_pub_key, serialized_pub_key_len, &check); EG(ret, err);
if (!check) {
failed_test = TEST_ECDH_COMP_ERROR;
ret = -1;
goto err;
}
/* Now derive the shared secret */
ret = ecccdh_shared_secret_size(¶ms, &shared_secret_len); EG(ret, err);
MUST_HAVE((sizeof(shared_secret) >= shared_secret_len), ret, err);
ret = ecccdh_derive_secret(&(kp.priv_key), c->peer_pub_key, c->peer_pub_key_len, shared_secret, shared_secret_len);
if (ret) {
failed_test = TEST_ECDH_ERROR;
ret = -1;
goto err;
}
/* Check it against the expected one */
MUST_HAVE((shared_secret_len == c->exp_shared_secret_len), ret, err);
ret = are_equal(shared_secret, c->exp_shared_secret, shared_secret_len, &check); EG(ret, err);
if (!check) {
failed_test = TEST_ECDH_COMP_ERROR;
ret = -1;
goto err;
}
break;
}
#endif
#if defined(WITH_X25519)
case X25519:{
u8 pub_key[X25519_SIZE];
u8 shared_secret[X25519_SIZE];
ret = local_memset(pub_key, 0, sizeof(pub_key)); EG(ret, err);
ret = local_memset(shared_secret, 0, sizeof(shared_secret)); EG(ret, err);
/* Compute our public key */
MUST_HAVE((c->our_priv_key_len == X25519_SIZE), ret, err);
ret = x25519_init_pub_key(c->our_priv_key, pub_key);
if (ret) {
failed_test = TEST_KEY_IMPORT_ERROR;
ret = -1;
goto err;
}
/* Check it against the expected one */
MUST_HAVE((c->exp_our_pub_key_len == X25519_SIZE), ret, err);
ret = are_equal(pub_key, c->exp_our_pub_key, X25519_SIZE, &check); EG(ret, err);
if (!check) {
failed_test = TEST_ECDH_COMP_ERROR;
ret = -1;
goto err;
}
/* Now derive the shared secret */
MUST_HAVE((c->peer_pub_key_len == X25519_SIZE), ret, err);
ret = x25519_derive_secret(c->our_priv_key, c->peer_pub_key, shared_secret);
if (ret) {
failed_test = TEST_ECDH_ERROR;
ret = -1;
goto err;
}
/* Check it against the expected one */
MUST_HAVE((c->exp_shared_secret_len == X25519_SIZE), ret, err);
ret = are_equal(shared_secret, c->exp_shared_secret, X25519_SIZE, &check); EG(ret, err);
if (!check) {
failed_test = TEST_ECDH_COMP_ERROR;
ret = -1;
goto err;
}
break;
}
#endif
#if defined(WITH_X448)
case X448:{
u8 pub_key[X448_SIZE];
u8 shared_secret[X448_SIZE];
ret = local_memset(pub_key, 0, sizeof(pub_key)); EG(ret, err);
ret = local_memset(shared_secret, 0, sizeof(shared_secret)); EG(ret, err);
/* Compute our public key */
MUST_HAVE((c->our_priv_key_len == X448_SIZE), ret, err);
ret = x448_init_pub_key(c->our_priv_key, pub_key);
if (ret) {
failed_test = TEST_KEY_IMPORT_ERROR;
ret = -1;
goto err;
}
/* Check it against the expected one */
MUST_HAVE((c->exp_our_pub_key_len == X448_SIZE), ret, err);
ret = are_equal(pub_key, c->exp_our_pub_key, X448_SIZE, &check); EG(ret, err);
if (!check) {
failed_test = TEST_ECDH_COMP_ERROR;
ret = -1;
goto err;
}
/* Now derive the shared secret */
MUST_HAVE((c->peer_pub_key_len == X448_SIZE), ret, err);
ret = x448_derive_secret(c->our_priv_key, c->peer_pub_key, shared_secret);
if (ret) {
failed_test = TEST_ECDH_ERROR;
ret = -1;
goto err;
}
/* Check it against the expected one */
MUST_HAVE((c->exp_shared_secret_len == X448_SIZE), ret, err);
ret = are_equal(shared_secret, c->exp_shared_secret, X448_SIZE, &check); EG(ret, err);
if (!check) {
failed_test = TEST_ECDH_COMP_ERROR;
ret = -1;
goto err;
}