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mbedtls/library/ecjpake.c
Manuel Pégourié-Gonnard b2eb1f7456 ECJPAKE: use MD_CAN macros 
sed -i -f md.sed \
    library/ecjpake.c \
    include/medtls/ecjpake.h \
    tests/suites/test_suite_ecjpake.*

With md.sed as follows:

s/\bMBEDTLS_HAS_ALG_MD5_VIA_MD_OR_PSA_BASED_ON_USE_PSA\b/MBEDTLS_MD_CAN_MD5/g
s/\bMBEDTLS_HAS_ALG_RIPEMD160_VIA_MD_OR_PSA_BASED_ON_USE_PSA\b/MBEDTLS_MD_CAN_RIPEMD160/g
s/\bMBEDTLS_HAS_ALG_SHA_1_VIA_MD_OR_PSA_BASED_ON_USE_PSA\b/MBEDTLS_MD_CAN_SHA1/g
s/\bMBEDTLS_HAS_ALG_SHA_224_VIA_MD_OR_PSA_BASED_ON_USE_PSA\b/MBEDTLS_MD_CAN_SHA224/g
s/\bMBEDTLS_HAS_ALG_SHA_256_VIA_MD_OR_PSA_BASED_ON_USE_PSA\b/MBEDTLS_MD_CAN_SHA256/g
s/\bMBEDTLS_HAS_ALG_SHA_384_VIA_MD_OR_PSA_BASED_ON_USE_PSA\b/MBEDTLS_MD_CAN_SHA384/g
s/\bMBEDTLS_HAS_ALG_SHA_512_VIA_MD_OR_PSA_BASED_ON_USE_PSA\b/MBEDTLS_MD_CAN_SHA512/g

s/\bMBEDTLS_HAS_ALG_MD5_VIA_MD_OR_PSA\b/MBEDTLS_MD_CAN_MD5/g
s/\bMBEDTLS_HAS_ALG_RIPEMD160_VIA_MD_OR_PSA\b/MBEDTLS_MD_CAN_RIPEMD160/g
s/\bMBEDTLS_HAS_ALG_SHA_1_VIA_MD_OR_PSA\b/MBEDTLS_MD_CAN_SHA1/g
s/\bMBEDTLS_HAS_ALG_SHA_224_VIA_MD_OR_PSA\b/MBEDTLS_MD_CAN_SHA224/g
s/\bMBEDTLS_HAS_ALG_SHA_256_VIA_MD_OR_PSA\b/MBEDTLS_MD_CAN_SHA256/g
s/\bMBEDTLS_HAS_ALG_SHA_384_VIA_MD_OR_PSA\b/MBEDTLS_MD_CAN_SHA384/g
s/\bMBEDTLS_HAS_ALG_SHA_512_VIA_MD_OR_PSA\b/MBEDTLS_MD_CAN_SHA512/g

s/\bMBEDTLS_HAS_ALG_MD5_VIA_LOWLEVEL_OR_PSA\b/MBEDTLS_MD_CAN_MD5/g
s/\bMBEDTLS_HAS_ALG_RIPEMD160_VIA_LOWLEVEL_OR_PSA\b/MBEDTLS_MD_CAN_RIPEMD160/g
s/\bMBEDTLS_HAS_ALG_SHA_1_VIA_LOWLEVEL_OR_PSA\b/MBEDTLS_MD_CAN_SHA1/g
s/\bMBEDTLS_HAS_ALG_SHA_224_VIA_LOWLEVEL_OR_PSA\b/MBEDTLS_MD_CAN_SHA224/g
s/\bMBEDTLS_HAS_ALG_SHA_256_VIA_LOWLEVEL_OR_PSA\b/MBEDTLS_MD_CAN_SHA256/g
s/\bMBEDTLS_HAS_ALG_SHA_384_VIA_LOWLEVEL_OR_PSA\b/MBEDTLS_MD_CAN_SHA384/g
s/\bMBEDTLS_HAS_ALG_SHA_512_VIA_LOWLEVEL_OR_PSA\b/MBEDTLS_MD_CAN_SHA512/g

s/\bMBEDTLS_MD5_C\b/MBEDTLS_MD_CAN_MD5/g
s/\bMBEDTLS_RIPEMD160_C\b/MBEDTLS_MD_CAN_RIPEMD160/g
s/\bMBEDTLS_SHA1_C\b/MBEDTLS_MD_CAN_SHA1/g
s/\bMBEDTLS_SHA224_C\b/MBEDTLS_MD_CAN_SHA224/g
s/\bMBEDTLS_SHA256_C\b/MBEDTLS_MD_CAN_SHA256/g
s/\bMBEDTLS_SHA384_C\b/MBEDTLS_MD_CAN_SHA384/g
s/\bMBEDTLS_SHA512_C\b/MBEDTLS_MD_CAN_SHA512/g

Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
2023-03-21 16:28:00 +01:00

1230 lines
41 KiB
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/*
* Elliptic curve J-PAKE
*
* Copyright The Mbed TLS Contributors
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* References in the code are to the Thread v1.0 Specification,
* available to members of the Thread Group http://threadgroup.org/
*/
#include "common.h"
#if defined(MBEDTLS_ECJPAKE_C)
#include "mbedtls/ecjpake.h"
#include "mbedtls/platform_util.h"
#include "mbedtls/error.h"
#include "hash_info.h"
#include <string.h>
#if !defined(MBEDTLS_ECJPAKE_ALT)
/*
* Convert a mbedtls_ecjpake_role to identifier string
*/
static const char * const ecjpake_id[] = {
"client",
"server"
};
#define ID_MINE (ecjpake_id[ctx->role])
#define ID_PEER (ecjpake_id[1 - ctx->role])
/**
* Helper to Compute a hash from md_type
*/
static int mbedtls_ecjpake_compute_hash(mbedtls_md_type_t md_type,
const unsigned char *input, size_t ilen,
unsigned char *output)
{
return mbedtls_md(mbedtls_md_info_from_type(md_type),
input, ilen, output);
}
/*
* Initialize context
*/
void mbedtls_ecjpake_init(mbedtls_ecjpake_context *ctx)
{
ctx->md_type = MBEDTLS_MD_NONE;
mbedtls_ecp_group_init(&ctx->grp);
ctx->point_format = MBEDTLS_ECP_PF_UNCOMPRESSED;
mbedtls_ecp_point_init(&ctx->Xm1);
mbedtls_ecp_point_init(&ctx->Xm2);
mbedtls_ecp_point_init(&ctx->Xp1);
mbedtls_ecp_point_init(&ctx->Xp2);
mbedtls_ecp_point_init(&ctx->Xp);
mbedtls_mpi_init(&ctx->xm1);
mbedtls_mpi_init(&ctx->xm2);
mbedtls_mpi_init(&ctx->s);
}
/*
* Free context
*/
void mbedtls_ecjpake_free(mbedtls_ecjpake_context *ctx)
{
if (ctx == NULL) {
return;
}
ctx->md_type = MBEDTLS_MD_NONE;
mbedtls_ecp_group_free(&ctx->grp);
mbedtls_ecp_point_free(&ctx->Xm1);
mbedtls_ecp_point_free(&ctx->Xm2);
mbedtls_ecp_point_free(&ctx->Xp1);
mbedtls_ecp_point_free(&ctx->Xp2);
mbedtls_ecp_point_free(&ctx->Xp);
mbedtls_mpi_free(&ctx->xm1);
mbedtls_mpi_free(&ctx->xm2);
mbedtls_mpi_free(&ctx->s);
}
/*
* Setup context
*/
int mbedtls_ecjpake_setup(mbedtls_ecjpake_context *ctx,
mbedtls_ecjpake_role role,
mbedtls_md_type_t hash,
mbedtls_ecp_group_id curve,
const unsigned char *secret,
size_t len)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
if (role != MBEDTLS_ECJPAKE_CLIENT && role != MBEDTLS_ECJPAKE_SERVER) {
return MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
}
ctx->role = role;
if ((mbedtls_md_info_from_type(hash)) == NULL) {
return MBEDTLS_ERR_MD_FEATURE_UNAVAILABLE;
}
ctx->md_type = hash;
MBEDTLS_MPI_CHK(mbedtls_ecp_group_load(&ctx->grp, curve));
MBEDTLS_MPI_CHK(mbedtls_mpi_read_binary(&ctx->s, secret, len));
cleanup:
if (ret != 0) {
mbedtls_ecjpake_free(ctx);
}
return ret;
}
int mbedtls_ecjpake_set_point_format(mbedtls_ecjpake_context *ctx,
int point_format)
{
switch (point_format) {
case MBEDTLS_ECP_PF_UNCOMPRESSED:
case MBEDTLS_ECP_PF_COMPRESSED:
ctx->point_format = point_format;
return 0;
default:
return MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
}
}
/*
* Check if context is ready for use
*/
int mbedtls_ecjpake_check(const mbedtls_ecjpake_context *ctx)
{
if (ctx->md_type == MBEDTLS_MD_NONE ||
ctx->grp.id == MBEDTLS_ECP_DP_NONE ||
ctx->s.p == NULL) {
return MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
}
return 0;
}
/*
* Write a point plus its length to a buffer
*/
static int ecjpake_write_len_point(unsigned char **p,
const unsigned char *end,
const mbedtls_ecp_group *grp,
const int pf,
const mbedtls_ecp_point *P)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
size_t len;
/* Need at least 4 for length plus 1 for point */
if (end < *p || end - *p < 5) {
return MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL;
}
ret = mbedtls_ecp_point_write_binary(grp, P, pf,
&len, *p + 4, end - (*p + 4));
if (ret != 0) {
return ret;
}
MBEDTLS_PUT_UINT32_BE(len, *p, 0);
*p += 4 + len;
return 0;
}
/*
* Size of the temporary buffer for ecjpake_hash:
* 3 EC points plus their length, plus ID and its length (4 + 6 bytes)
*/
#define ECJPAKE_HASH_BUF_LEN (3 * (4 + MBEDTLS_ECP_MAX_PT_LEN) + 4 + 6)
/*
* Compute hash for ZKP (7.4.2.2.2.1)
*/
static int ecjpake_hash(const mbedtls_md_type_t md_type,
const mbedtls_ecp_group *grp,
const int pf,
const mbedtls_ecp_point *G,
const mbedtls_ecp_point *V,
const mbedtls_ecp_point *X,
const char *id,
mbedtls_mpi *h)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
unsigned char buf[ECJPAKE_HASH_BUF_LEN];
unsigned char *p = buf;
const unsigned char *end = buf + sizeof(buf);
const size_t id_len = strlen(id);
unsigned char hash[MBEDTLS_HASH_MAX_SIZE];
/* Write things to temporary buffer */
MBEDTLS_MPI_CHK(ecjpake_write_len_point(&p, end, grp, pf, G));
MBEDTLS_MPI_CHK(ecjpake_write_len_point(&p, end, grp, pf, V));
MBEDTLS_MPI_CHK(ecjpake_write_len_point(&p, end, grp, pf, X));
if (end - p < 4) {
return MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL;
}
MBEDTLS_PUT_UINT32_BE(id_len, p, 0);
p += 4;
if (end < p || (size_t) (end - p) < id_len) {
return MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL;
}
memcpy(p, id, id_len);
p += id_len;
/* Compute hash */
MBEDTLS_MPI_CHK(mbedtls_ecjpake_compute_hash(md_type,
buf, p - buf, hash));
/* Turn it into an integer mod n */
MBEDTLS_MPI_CHK(mbedtls_mpi_read_binary(h, hash,
mbedtls_hash_info_get_size(md_type)));
MBEDTLS_MPI_CHK(mbedtls_mpi_mod_mpi(h, h, &grp->N));
cleanup:
return ret;
}
/*
* Parse a ECShnorrZKP (7.4.2.2.2) and verify it (7.4.2.3.3)
*/
static int ecjpake_zkp_read(const mbedtls_md_type_t md_type,
const mbedtls_ecp_group *grp,
const int pf,
const mbedtls_ecp_point *G,
const mbedtls_ecp_point *X,
const char *id,
const unsigned char **p,
const unsigned char *end)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
mbedtls_ecp_point V, VV;
mbedtls_mpi r, h;
size_t r_len;
mbedtls_ecp_point_init(&V);
mbedtls_ecp_point_init(&VV);
mbedtls_mpi_init(&r);
mbedtls_mpi_init(&h);
/*
* struct {
* ECPoint V;
* opaque r<1..2^8-1>;
* } ECSchnorrZKP;
*/
if (end < *p) {
return MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
}
MBEDTLS_MPI_CHK(mbedtls_ecp_tls_read_point(grp, &V, p, end - *p));
if (end < *p || (size_t) (end - *p) < 1) {
ret = MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
goto cleanup;
}
r_len = *(*p)++;
if (end < *p || (size_t) (end - *p) < r_len || r_len == 0) {
ret = MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
goto cleanup;
}
MBEDTLS_MPI_CHK(mbedtls_mpi_read_binary(&r, *p, r_len));
*p += r_len;
/*
* Verification
*/
MBEDTLS_MPI_CHK(ecjpake_hash(md_type, grp, pf, G, &V, X, id, &h));
MBEDTLS_MPI_CHK(mbedtls_ecp_muladd((mbedtls_ecp_group *) grp,
&VV, &h, X, &r, G));
if (mbedtls_ecp_point_cmp(&VV, &V) != 0) {
ret = MBEDTLS_ERR_ECP_VERIFY_FAILED;
goto cleanup;
}
cleanup:
mbedtls_ecp_point_free(&V);
mbedtls_ecp_point_free(&VV);
mbedtls_mpi_free(&r);
mbedtls_mpi_free(&h);
return ret;
}
/*
* Generate ZKP (7.4.2.3.2) and write it as ECSchnorrZKP (7.4.2.2.2)
*/
static int ecjpake_zkp_write(const mbedtls_md_type_t md_type,
const mbedtls_ecp_group *grp,
const int pf,
const mbedtls_ecp_point *G,
const mbedtls_mpi *x,
const mbedtls_ecp_point *X,
const char *id,
unsigned char **p,
const unsigned char *end,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
mbedtls_ecp_point V;
mbedtls_mpi v;
mbedtls_mpi h; /* later recycled to hold r */
size_t len;
if (end < *p) {
return MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL;
}
mbedtls_ecp_point_init(&V);
mbedtls_mpi_init(&v);
mbedtls_mpi_init(&h);
/* Compute signature */
MBEDTLS_MPI_CHK(mbedtls_ecp_gen_keypair_base((mbedtls_ecp_group *) grp,
G, &v, &V, f_rng, p_rng));
MBEDTLS_MPI_CHK(ecjpake_hash(md_type, grp, pf, G, &V, X, id, &h));
MBEDTLS_MPI_CHK(mbedtls_mpi_mul_mpi(&h, &h, x)); /* x*h */
MBEDTLS_MPI_CHK(mbedtls_mpi_sub_mpi(&h, &v, &h)); /* v - x*h */
MBEDTLS_MPI_CHK(mbedtls_mpi_mod_mpi(&h, &h, &grp->N)); /* r */
/* Write it out */
MBEDTLS_MPI_CHK(mbedtls_ecp_tls_write_point(grp, &V,
pf, &len, *p, end - *p));
*p += len;
len = mbedtls_mpi_size(&h); /* actually r */
if (end < *p || (size_t) (end - *p) < 1 + len || len > 255) {
ret = MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL;
goto cleanup;
}
*(*p)++ = MBEDTLS_BYTE_0(len);
MBEDTLS_MPI_CHK(mbedtls_mpi_write_binary(&h, *p, len)); /* r */
*p += len;
cleanup:
mbedtls_ecp_point_free(&V);
mbedtls_mpi_free(&v);
mbedtls_mpi_free(&h);
return ret;
}
/*
* Parse a ECJPAKEKeyKP (7.4.2.2.1) and check proof
* Output: verified public key X
*/
static int ecjpake_kkp_read(const mbedtls_md_type_t md_type,
const mbedtls_ecp_group *grp,
const int pf,
const mbedtls_ecp_point *G,
mbedtls_ecp_point *X,
const char *id,
const unsigned char **p,
const unsigned char *end)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
if (end < *p) {
return MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
}
/*
* struct {
* ECPoint X;
* ECSchnorrZKP zkp;
* } ECJPAKEKeyKP;
*/
MBEDTLS_MPI_CHK(mbedtls_ecp_tls_read_point(grp, X, p, end - *p));
if (mbedtls_ecp_is_zero(X)) {
ret = MBEDTLS_ERR_ECP_INVALID_KEY;
goto cleanup;
}
MBEDTLS_MPI_CHK(ecjpake_zkp_read(md_type, grp, pf, G, X, id, p, end));
cleanup:
return ret;
}
/*
* Generate an ECJPAKEKeyKP
* Output: the serialized structure, plus private/public key pair
*/
static int ecjpake_kkp_write(const mbedtls_md_type_t md_type,
const mbedtls_ecp_group *grp,
const int pf,
const mbedtls_ecp_point *G,
mbedtls_mpi *x,
mbedtls_ecp_point *X,
const char *id,
unsigned char **p,
const unsigned char *end,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
size_t len;
if (end < *p) {
return MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL;
}
/* Generate key (7.4.2.3.1) and write it out */
MBEDTLS_MPI_CHK(mbedtls_ecp_gen_keypair_base((mbedtls_ecp_group *) grp, G, x, X,
f_rng, p_rng));
MBEDTLS_MPI_CHK(mbedtls_ecp_tls_write_point(grp, X,
pf, &len, *p, end - *p));
*p += len;
/* Generate and write proof */
MBEDTLS_MPI_CHK(ecjpake_zkp_write(md_type, grp, pf, G, x, X, id,
p, end, f_rng, p_rng));
cleanup:
return ret;
}
/*
* Read a ECJPAKEKeyKPPairList (7.4.2.3) and check proofs
* Outputs: verified peer public keys Xa, Xb
*/
static int ecjpake_kkpp_read(const mbedtls_md_type_t md_type,
const mbedtls_ecp_group *grp,
const int pf,
const mbedtls_ecp_point *G,
mbedtls_ecp_point *Xa,
mbedtls_ecp_point *Xb,
const char *id,
const unsigned char *buf,
size_t len)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
const unsigned char *p = buf;
const unsigned char *end = buf + len;
/*
* struct {
* ECJPAKEKeyKP ecjpake_key_kp_pair_list[2];
* } ECJPAKEKeyKPPairList;
*/
MBEDTLS_MPI_CHK(ecjpake_kkp_read(md_type, grp, pf, G, Xa, id, &p, end));
MBEDTLS_MPI_CHK(ecjpake_kkp_read(md_type, grp, pf, G, Xb, id, &p, end));
if (p != end) {
ret = MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
}
cleanup:
return ret;
}
/*
* Generate a ECJPAKEKeyKPPairList
* Outputs: the serialized structure, plus two private/public key pairs
*/
static int ecjpake_kkpp_write(const mbedtls_md_type_t md_type,
const mbedtls_ecp_group *grp,
const int pf,
const mbedtls_ecp_point *G,
mbedtls_mpi *xm1,
mbedtls_ecp_point *Xa,
mbedtls_mpi *xm2,
mbedtls_ecp_point *Xb,
const char *id,
unsigned char *buf,
size_t len,
size_t *olen,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
unsigned char *p = buf;
const unsigned char *end = buf + len;
MBEDTLS_MPI_CHK(ecjpake_kkp_write(md_type, grp, pf, G, xm1, Xa, id,
&p, end, f_rng, p_rng));
MBEDTLS_MPI_CHK(ecjpake_kkp_write(md_type, grp, pf, G, xm2, Xb, id,
&p, end, f_rng, p_rng));
*olen = p - buf;
cleanup:
return ret;
}
/*
* Read and process the first round message
*/
int mbedtls_ecjpake_read_round_one(mbedtls_ecjpake_context *ctx,
const unsigned char *buf,
size_t len)
{
return ecjpake_kkpp_read(ctx->md_type, &ctx->grp, ctx->point_format,
&ctx->grp.G,
&ctx->Xp1, &ctx->Xp2, ID_PEER,
buf, len);
}
/*
* Generate and write the first round message
*/
int mbedtls_ecjpake_write_round_one(mbedtls_ecjpake_context *ctx,
unsigned char *buf, size_t len, size_t *olen,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng)
{
return ecjpake_kkpp_write(ctx->md_type, &ctx->grp, ctx->point_format,
&ctx->grp.G,
&ctx->xm1, &ctx->Xm1, &ctx->xm2, &ctx->Xm2,
ID_MINE, buf, len, olen, f_rng, p_rng);
}
/*
* Compute the sum of three points R = A + B + C
*/
static int ecjpake_ecp_add3(mbedtls_ecp_group *grp, mbedtls_ecp_point *R,
const mbedtls_ecp_point *A,
const mbedtls_ecp_point *B,
const mbedtls_ecp_point *C)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
mbedtls_mpi one;
mbedtls_mpi_init(&one);
MBEDTLS_MPI_CHK(mbedtls_mpi_lset(&one, 1));
MBEDTLS_MPI_CHK(mbedtls_ecp_muladd(grp, R, &one, A, &one, B));
MBEDTLS_MPI_CHK(mbedtls_ecp_muladd(grp, R, &one, R, &one, C));
cleanup:
mbedtls_mpi_free(&one);
return ret;
}
/*
* Read and process second round message (C: 7.4.2.5, S: 7.4.2.6)
*/
int mbedtls_ecjpake_read_round_two(mbedtls_ecjpake_context *ctx,
const unsigned char *buf,
size_t len)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
const unsigned char *p = buf;
const unsigned char *end = buf + len;
mbedtls_ecp_group grp;
mbedtls_ecp_point G; /* C: GB, S: GA */
mbedtls_ecp_group_init(&grp);
mbedtls_ecp_point_init(&G);
/*
* Server: GA = X3 + X4 + X1 (7.4.2.6.1)
* Client: GB = X1 + X2 + X3 (7.4.2.5.1)
* Unified: G = Xm1 + Xm2 + Xp1
* We need that before parsing in order to check Xp as we read it
*/
MBEDTLS_MPI_CHK(ecjpake_ecp_add3(&ctx->grp, &G,
&ctx->Xm1, &ctx->Xm2, &ctx->Xp1));
/*
* struct {
* ECParameters curve_params; // only client reading server msg
* ECJPAKEKeyKP ecjpake_key_kp;
* } Client/ServerECJPAKEParams;
*/
if (ctx->role == MBEDTLS_ECJPAKE_CLIENT) {
MBEDTLS_MPI_CHK(mbedtls_ecp_tls_read_group(&grp, &p, len));
if (grp.id != ctx->grp.id) {
ret = MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE;
goto cleanup;
}
}
MBEDTLS_MPI_CHK(ecjpake_kkp_read(ctx->md_type, &ctx->grp,
ctx->point_format,
&G, &ctx->Xp, ID_PEER, &p, end));
if (p != end) {
ret = MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
goto cleanup;
}
cleanup:
mbedtls_ecp_group_free(&grp);
mbedtls_ecp_point_free(&G);
return ret;
}
/*
* Compute R = +/- X * S mod N, taking care not to leak S
*/
static int ecjpake_mul_secret(mbedtls_mpi *R, int sign,
const mbedtls_mpi *X,
const mbedtls_mpi *S,
const mbedtls_mpi *N,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
mbedtls_mpi b; /* Blinding value, then s + N * blinding */
mbedtls_mpi_init(&b);
/* b = s + rnd-128-bit * N */
MBEDTLS_MPI_CHK(mbedtls_mpi_fill_random(&b, 16, f_rng, p_rng));
MBEDTLS_MPI_CHK(mbedtls_mpi_mul_mpi(&b, &b, N));
MBEDTLS_MPI_CHK(mbedtls_mpi_add_mpi(&b, &b, S));
/* R = sign * X * b mod N */
MBEDTLS_MPI_CHK(mbedtls_mpi_mul_mpi(R, X, &b));
R->s *= sign;
MBEDTLS_MPI_CHK(mbedtls_mpi_mod_mpi(R, R, N));
cleanup:
mbedtls_mpi_free(&b);
return ret;
}
/*
* Generate and write the second round message (S: 7.4.2.5, C: 7.4.2.6)
*/
int mbedtls_ecjpake_write_round_two(mbedtls_ecjpake_context *ctx,
unsigned char *buf, size_t len, size_t *olen,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
mbedtls_ecp_point G; /* C: GA, S: GB */
mbedtls_ecp_point Xm; /* C: Xc, S: Xs */
mbedtls_mpi xm; /* C: xc, S: xs */
unsigned char *p = buf;
const unsigned char *end = buf + len;
size_t ec_len;
mbedtls_ecp_point_init(&G);
mbedtls_ecp_point_init(&Xm);
mbedtls_mpi_init(&xm);
/*
* First generate private/public key pair (S: 7.4.2.5.1, C: 7.4.2.6.1)
*
* Client: GA = X1 + X3 + X4 | xs = x2 * s | Xc = xc * GA
* Server: GB = X3 + X1 + X2 | xs = x4 * s | Xs = xs * GB
* Unified: G = Xm1 + Xp1 + Xp2 | xm = xm2 * s | Xm = xm * G
*/
MBEDTLS_MPI_CHK(ecjpake_ecp_add3(&ctx->grp, &G,
&ctx->Xp1, &ctx->Xp2, &ctx->Xm1));
MBEDTLS_MPI_CHK(ecjpake_mul_secret(&xm, 1, &ctx->xm2, &ctx->s,
&ctx->grp.N, f_rng, p_rng));
MBEDTLS_MPI_CHK(mbedtls_ecp_mul(&ctx->grp, &Xm, &xm, &G, f_rng, p_rng));
/*
* Now write things out
*
* struct {
* ECParameters curve_params; // only server writing its message
* ECJPAKEKeyKP ecjpake_key_kp;
* } Client/ServerECJPAKEParams;
*/
if (ctx->role == MBEDTLS_ECJPAKE_SERVER) {
if (end < p) {
ret = MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL;
goto cleanup;
}
MBEDTLS_MPI_CHK(mbedtls_ecp_tls_write_group(&ctx->grp, &ec_len,
p, end - p));
p += ec_len;
}
if (end < p) {
ret = MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL;
goto cleanup;
}
MBEDTLS_MPI_CHK(mbedtls_ecp_tls_write_point(&ctx->grp, &Xm,
ctx->point_format, &ec_len, p, end - p));
p += ec_len;
MBEDTLS_MPI_CHK(ecjpake_zkp_write(ctx->md_type, &ctx->grp,
ctx->point_format,
&G, &xm, &Xm, ID_MINE,
&p, end, f_rng, p_rng));
*olen = p - buf;
cleanup:
mbedtls_ecp_point_free(&G);
mbedtls_ecp_point_free(&Xm);
mbedtls_mpi_free(&xm);
return ret;
}
/*
* Derive PMS (7.4.2.7 / 7.4.2.8)
*/
static int mbedtls_ecjpake_derive_k(mbedtls_ecjpake_context *ctx,
mbedtls_ecp_point *K,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
mbedtls_mpi m_xm2_s, one;
mbedtls_mpi_init(&m_xm2_s);
mbedtls_mpi_init(&one);
MBEDTLS_MPI_CHK(mbedtls_mpi_lset(&one, 1));
/*
* Client: K = ( Xs - X4 * x2 * s ) * x2
* Server: K = ( Xc - X2 * x4 * s ) * x4
* Unified: K = ( Xp - Xp2 * xm2 * s ) * xm2
*/
MBEDTLS_MPI_CHK(ecjpake_mul_secret(&m_xm2_s, -1, &ctx->xm2, &ctx->s,
&ctx->grp.N, f_rng, p_rng));
MBEDTLS_MPI_CHK(mbedtls_ecp_muladd(&ctx->grp, K,
&one, &ctx->Xp,
&m_xm2_s, &ctx->Xp2));
MBEDTLS_MPI_CHK(mbedtls_ecp_mul(&ctx->grp, K, &ctx->xm2, K,
f_rng, p_rng));
cleanup:
mbedtls_mpi_free(&m_xm2_s);
mbedtls_mpi_free(&one);
return ret;
}
int mbedtls_ecjpake_derive_secret(mbedtls_ecjpake_context *ctx,
unsigned char *buf, size_t len, size_t *olen,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
mbedtls_ecp_point K;
unsigned char kx[MBEDTLS_ECP_MAX_BYTES];
size_t x_bytes;
*olen = mbedtls_hash_info_get_size(ctx->md_type);
if (len < *olen) {
return MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL;
}
mbedtls_ecp_point_init(&K);
ret = mbedtls_ecjpake_derive_k(ctx, &K, f_rng, p_rng);
if (ret) {
goto cleanup;
}
/* PMS = SHA-256( K.X ) */
x_bytes = (ctx->grp.pbits + 7) / 8;
MBEDTLS_MPI_CHK(mbedtls_mpi_write_binary(&K.X, kx, x_bytes));
MBEDTLS_MPI_CHK(mbedtls_ecjpake_compute_hash(ctx->md_type,
kx, x_bytes, buf));
cleanup:
mbedtls_ecp_point_free(&K);
return ret;
}
int mbedtls_ecjpake_write_shared_key(mbedtls_ecjpake_context *ctx,
unsigned char *buf, size_t len, size_t *olen,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
mbedtls_ecp_point K;
mbedtls_ecp_point_init(&K);
ret = mbedtls_ecjpake_derive_k(ctx, &K, f_rng, p_rng);
if (ret) {
goto cleanup;
}
ret = mbedtls_ecp_point_write_binary(&ctx->grp, &K, ctx->point_format,
olen, buf, len);
if (ret != 0) {
goto cleanup;
}
cleanup:
mbedtls_ecp_point_free(&K);
return ret;
}
#undef ID_MINE
#undef ID_PEER
#endif /* ! MBEDTLS_ECJPAKE_ALT */
#if defined(MBEDTLS_SELF_TEST)
#include "mbedtls/platform.h"
#if !defined(MBEDTLS_ECP_DP_SECP256R1_ENABLED) || \
!defined(MBEDTLS_MD_CAN_SHA256)
int mbedtls_ecjpake_self_test(int verbose)
{
(void) verbose;
return 0;
}
#else
static const unsigned char ecjpake_test_password[] = {
0x74, 0x68, 0x72, 0x65, 0x61, 0x64, 0x6a, 0x70, 0x61, 0x6b, 0x65, 0x74,
0x65, 0x73, 0x74
};
#if !defined(MBEDTLS_ECJPAKE_ALT)
static const unsigned char ecjpake_test_x1[] = {
0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c,
0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18,
0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x21
};
static const unsigned char ecjpake_test_x2[] = {
0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c,
0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x81
};
static const unsigned char ecjpake_test_x3[] = {
0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c,
0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x81
};
static const unsigned char ecjpake_test_x4[] = {
0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xcb, 0xcc,
0xcd, 0xce, 0xcf, 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8,
0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, 0xe1
};
static const unsigned char ecjpake_test_cli_one[] = {
0x41, 0x04, 0xac, 0xcf, 0x01, 0x06, 0xef, 0x85, 0x8f, 0xa2, 0xd9, 0x19,
0x33, 0x13, 0x46, 0x80, 0x5a, 0x78, 0xb5, 0x8b, 0xba, 0xd0, 0xb8, 0x44,
0xe5, 0xc7, 0x89, 0x28, 0x79, 0x14, 0x61, 0x87, 0xdd, 0x26, 0x66, 0xad,
0xa7, 0x81, 0xbb, 0x7f, 0x11, 0x13, 0x72, 0x25, 0x1a, 0x89, 0x10, 0x62,
0x1f, 0x63, 0x4d, 0xf1, 0x28, 0xac, 0x48, 0xe3, 0x81, 0xfd, 0x6e, 0xf9,
0x06, 0x07, 0x31, 0xf6, 0x94, 0xa4, 0x41, 0x04, 0x1d, 0xd0, 0xbd, 0x5d,
0x45, 0x66, 0xc9, 0xbe, 0xd9, 0xce, 0x7d, 0xe7, 0x01, 0xb5, 0xe8, 0x2e,
0x08, 0xe8, 0x4b, 0x73, 0x04, 0x66, 0x01, 0x8a, 0xb9, 0x03, 0xc7, 0x9e,
0xb9, 0x82, 0x17, 0x22, 0x36, 0xc0, 0xc1, 0x72, 0x8a, 0xe4, 0xbf, 0x73,
0x61, 0x0d, 0x34, 0xde, 0x44, 0x24, 0x6e, 0xf3, 0xd9, 0xc0, 0x5a, 0x22,
0x36, 0xfb, 0x66, 0xa6, 0x58, 0x3d, 0x74, 0x49, 0x30, 0x8b, 0xab, 0xce,
0x20, 0x72, 0xfe, 0x16, 0x66, 0x29, 0x92, 0xe9, 0x23, 0x5c, 0x25, 0x00,
0x2f, 0x11, 0xb1, 0x50, 0x87, 0xb8, 0x27, 0x38, 0xe0, 0x3c, 0x94, 0x5b,
0xf7, 0xa2, 0x99, 0x5d, 0xda, 0x1e, 0x98, 0x34, 0x58, 0x41, 0x04, 0x7e,
0xa6, 0xe3, 0xa4, 0x48, 0x70, 0x37, 0xa9, 0xe0, 0xdb, 0xd7, 0x92, 0x62,
0xb2, 0xcc, 0x27, 0x3e, 0x77, 0x99, 0x30, 0xfc, 0x18, 0x40, 0x9a, 0xc5,
0x36, 0x1c, 0x5f, 0xe6, 0x69, 0xd7, 0x02, 0xe1, 0x47, 0x79, 0x0a, 0xeb,
0x4c, 0xe7, 0xfd, 0x65, 0x75, 0xab, 0x0f, 0x6c, 0x7f, 0xd1, 0xc3, 0x35,
0x93, 0x9a, 0xa8, 0x63, 0xba, 0x37, 0xec, 0x91, 0xb7, 0xe3, 0x2b, 0xb0,
0x13, 0xbb, 0x2b, 0x41, 0x04, 0xa4, 0x95, 0x58, 0xd3, 0x2e, 0xd1, 0xeb,
0xfc, 0x18, 0x16, 0xaf, 0x4f, 0xf0, 0x9b, 0x55, 0xfc, 0xb4, 0xca, 0x47,
0xb2, 0xa0, 0x2d, 0x1e, 0x7c, 0xaf, 0x11, 0x79, 0xea, 0x3f, 0xe1, 0x39,
0x5b, 0x22, 0xb8, 0x61, 0x96, 0x40, 0x16, 0xfa, 0xba, 0xf7, 0x2c, 0x97,
0x56, 0x95, 0xd9, 0x3d, 0x4d, 0xf0, 0xe5, 0x19, 0x7f, 0xe9, 0xf0, 0x40,
0x63, 0x4e, 0xd5, 0x97, 0x64, 0x93, 0x77, 0x87, 0xbe, 0x20, 0xbc, 0x4d,
0xee, 0xbb, 0xf9, 0xb8, 0xd6, 0x0a, 0x33, 0x5f, 0x04, 0x6c, 0xa3, 0xaa,
0x94, 0x1e, 0x45, 0x86, 0x4c, 0x7c, 0xad, 0xef, 0x9c, 0xf7, 0x5b, 0x3d,
0x8b, 0x01, 0x0e, 0x44, 0x3e, 0xf0
};
static const unsigned char ecjpake_test_srv_one[] = {
0x41, 0x04, 0x7e, 0xa6, 0xe3, 0xa4, 0x48, 0x70, 0x37, 0xa9, 0xe0, 0xdb,
0xd7, 0x92, 0x62, 0xb2, 0xcc, 0x27, 0x3e, 0x77, 0x99, 0x30, 0xfc, 0x18,
0x40, 0x9a, 0xc5, 0x36, 0x1c, 0x5f, 0xe6, 0x69, 0xd7, 0x02, 0xe1, 0x47,
0x79, 0x0a, 0xeb, 0x4c, 0xe7, 0xfd, 0x65, 0x75, 0xab, 0x0f, 0x6c, 0x7f,
0xd1, 0xc3, 0x35, 0x93, 0x9a, 0xa8, 0x63, 0xba, 0x37, 0xec, 0x91, 0xb7,
0xe3, 0x2b, 0xb0, 0x13, 0xbb, 0x2b, 0x41, 0x04, 0x09, 0xf8, 0x5b, 0x3d,
0x20, 0xeb, 0xd7, 0x88, 0x5c, 0xe4, 0x64, 0xc0, 0x8d, 0x05, 0x6d, 0x64,
0x28, 0xfe, 0x4d, 0xd9, 0x28, 0x7a, 0xa3, 0x65, 0xf1, 0x31, 0xf4, 0x36,
0x0f, 0xf3, 0x86, 0xd8, 0x46, 0x89, 0x8b, 0xc4, 0xb4, 0x15, 0x83, 0xc2,
0xa5, 0x19, 0x7f, 0x65, 0xd7, 0x87, 0x42, 0x74, 0x6c, 0x12, 0xa5, 0xec,
0x0a, 0x4f, 0xfe, 0x2f, 0x27, 0x0a, 0x75, 0x0a, 0x1d, 0x8f, 0xb5, 0x16,
0x20, 0x93, 0x4d, 0x74, 0xeb, 0x43, 0xe5, 0x4d, 0xf4, 0x24, 0xfd, 0x96,
0x30, 0x6c, 0x01, 0x17, 0xbf, 0x13, 0x1a, 0xfa, 0xbf, 0x90, 0xa9, 0xd3,
0x3d, 0x11, 0x98, 0xd9, 0x05, 0x19, 0x37, 0x35, 0x14, 0x41, 0x04, 0x19,
0x0a, 0x07, 0x70, 0x0f, 0xfa, 0x4b, 0xe6, 0xae, 0x1d, 0x79, 0xee, 0x0f,
0x06, 0xae, 0xb5, 0x44, 0xcd, 0x5a, 0xdd, 0xaa, 0xbe, 0xdf, 0x70, 0xf8,
0x62, 0x33, 0x21, 0x33, 0x2c, 0x54, 0xf3, 0x55, 0xf0, 0xfb, 0xfe, 0xc7,
0x83, 0xed, 0x35, 0x9e, 0x5d, 0x0b, 0xf7, 0x37, 0x7a, 0x0f, 0xc4, 0xea,
0x7a, 0xce, 0x47, 0x3c, 0x9c, 0x11, 0x2b, 0x41, 0xcc, 0xd4, 0x1a, 0xc5,
0x6a, 0x56, 0x12, 0x41, 0x04, 0x36, 0x0a, 0x1c, 0xea, 0x33, 0xfc, 0xe6,
0x41, 0x15, 0x64, 0x58, 0xe0, 0xa4, 0xea, 0xc2, 0x19, 0xe9, 0x68, 0x31,
0xe6, 0xae, 0xbc, 0x88, 0xb3, 0xf3, 0x75, 0x2f, 0x93, 0xa0, 0x28, 0x1d,
0x1b, 0xf1, 0xfb, 0x10, 0x60, 0x51, 0xdb, 0x96, 0x94, 0xa8, 0xd6, 0xe8,
0x62, 0xa5, 0xef, 0x13, 0x24, 0xa3, 0xd9, 0xe2, 0x78, 0x94, 0xf1, 0xee,
0x4f, 0x7c, 0x59, 0x19, 0x99, 0x65, 0xa8, 0xdd, 0x4a, 0x20, 0x91, 0x84,
0x7d, 0x2d, 0x22, 0xdf, 0x3e, 0xe5, 0x5f, 0xaa, 0x2a, 0x3f, 0xb3, 0x3f,
0xd2, 0xd1, 0xe0, 0x55, 0xa0, 0x7a, 0x7c, 0x61, 0xec, 0xfb, 0x8d, 0x80,
0xec, 0x00, 0xc2, 0xc9, 0xeb, 0x12
};
static const unsigned char ecjpake_test_srv_two[] = {
0x03, 0x00, 0x17, 0x41, 0x04, 0x0f, 0xb2, 0x2b, 0x1d, 0x5d, 0x11, 0x23,
0xe0, 0xef, 0x9f, 0xeb, 0x9d, 0x8a, 0x2e, 0x59, 0x0a, 0x1f, 0x4d, 0x7c,
0xed, 0x2c, 0x2b, 0x06, 0x58, 0x6e, 0x8f, 0x2a, 0x16, 0xd4, 0xeb, 0x2f,
0xda, 0x43, 0x28, 0xa2, 0x0b, 0x07, 0xd8, 0xfd, 0x66, 0x76, 0x54, 0xca,
0x18, 0xc5, 0x4e, 0x32, 0xa3, 0x33, 0xa0, 0x84, 0x54, 0x51, 0xe9, 0x26,
0xee, 0x88, 0x04, 0xfd, 0x7a, 0xf0, 0xaa, 0xa7, 0xa6, 0x41, 0x04, 0x55,
0x16, 0xea, 0x3e, 0x54, 0xa0, 0xd5, 0xd8, 0xb2, 0xce, 0x78, 0x6b, 0x38,
0xd3, 0x83, 0x37, 0x00, 0x29, 0xa5, 0xdb, 0xe4, 0x45, 0x9c, 0x9d, 0xd6,
0x01, 0xb4, 0x08, 0xa2, 0x4a, 0xe6, 0x46, 0x5c, 0x8a, 0xc9, 0x05, 0xb9,
0xeb, 0x03, 0xb5, 0xd3, 0x69, 0x1c, 0x13, 0x9e, 0xf8, 0x3f, 0x1c, 0xd4,
0x20, 0x0f, 0x6c, 0x9c, 0xd4, 0xec, 0x39, 0x22, 0x18, 0xa5, 0x9e, 0xd2,
0x43, 0xd3, 0xc8, 0x20, 0xff, 0x72, 0x4a, 0x9a, 0x70, 0xb8, 0x8c, 0xb8,
0x6f, 0x20, 0xb4, 0x34, 0xc6, 0x86, 0x5a, 0xa1, 0xcd, 0x79, 0x06, 0xdd,
0x7c, 0x9b, 0xce, 0x35, 0x25, 0xf5, 0x08, 0x27, 0x6f, 0x26, 0x83, 0x6c
};
static const unsigned char ecjpake_test_cli_two[] = {
0x41, 0x04, 0x69, 0xd5, 0x4e, 0xe8, 0x5e, 0x90, 0xce, 0x3f, 0x12, 0x46,
0x74, 0x2d, 0xe5, 0x07, 0xe9, 0x39, 0xe8, 0x1d, 0x1d, 0xc1, 0xc5, 0xcb,
0x98, 0x8b, 0x58, 0xc3, 0x10, 0xc9, 0xfd, 0xd9, 0x52, 0x4d, 0x93, 0x72,
0x0b, 0x45, 0x54, 0x1c, 0x83, 0xee, 0x88, 0x41, 0x19, 0x1d, 0xa7, 0xce,
0xd8, 0x6e, 0x33, 0x12, 0xd4, 0x36, 0x23, 0xc1, 0xd6, 0x3e, 0x74, 0x98,
0x9a, 0xba, 0x4a, 0xff, 0xd1, 0xee, 0x41, 0x04, 0x07, 0x7e, 0x8c, 0x31,
0xe2, 0x0e, 0x6b, 0xed, 0xb7, 0x60, 0xc1, 0x35, 0x93, 0xe6, 0x9f, 0x15,
0xbe, 0x85, 0xc2, 0x7d, 0x68, 0xcd, 0x09, 0xcc, 0xb8, 0xc4, 0x18, 0x36,
0x08, 0x91, 0x7c, 0x5c, 0x3d, 0x40, 0x9f, 0xac, 0x39, 0xfe, 0xfe, 0xe8,
0x2f, 0x72, 0x92, 0xd3, 0x6f, 0x0d, 0x23, 0xe0, 0x55, 0x91, 0x3f, 0x45,
0xa5, 0x2b, 0x85, 0xdd, 0x8a, 0x20, 0x52, 0xe9, 0xe1, 0x29, 0xbb, 0x4d,
0x20, 0x0f, 0x01, 0x1f, 0x19, 0x48, 0x35, 0x35, 0xa6, 0xe8, 0x9a, 0x58,
0x0c, 0x9b, 0x00, 0x03, 0xba, 0xf2, 0x14, 0x62, 0xec, 0xe9, 0x1a, 0x82,
0xcc, 0x38, 0xdb, 0xdc, 0xae, 0x60, 0xd9, 0xc5, 0x4c
};
static const unsigned char ecjpake_test_shared_key[] = {
0x04, 0x01, 0xab, 0xe9, 0xf2, 0xc7, 0x3a, 0x99, 0x14, 0xcb, 0x1f, 0x80,
0xfb, 0x9d, 0xdb, 0x7e, 0x00, 0x12, 0xa8, 0x9c, 0x2f, 0x39, 0x27, 0x79,
0xf9, 0x64, 0x40, 0x14, 0x75, 0xea, 0xc1, 0x31, 0x28, 0x43, 0x8f, 0xe1,
0x12, 0x41, 0xd6, 0xc1, 0xe5, 0x5f, 0x7b, 0x80, 0x88, 0x94, 0xc9, 0xc0,
0x27, 0xa3, 0x34, 0x41, 0xf5, 0xcb, 0xa1, 0xfe, 0x6c, 0xc7, 0xe6, 0x12,
0x17, 0xc3, 0xde, 0x27, 0xb4,
};
static const unsigned char ecjpake_test_pms[] = {
0xf3, 0xd4, 0x7f, 0x59, 0x98, 0x44, 0xdb, 0x92, 0xa5, 0x69, 0xbb, 0xe7,
0x98, 0x1e, 0x39, 0xd9, 0x31, 0xfd, 0x74, 0x3b, 0xf2, 0x2e, 0x98, 0xf9,
0xb4, 0x38, 0xf7, 0x19, 0xd3, 0xc4, 0xf3, 0x51
};
/*
* PRNG for test - !!!INSECURE NEVER USE IN PRODUCTION!!!
*
* This is the linear congruential generator from numerical recipes,
* except we only use the low byte as the output. See
* https://en.wikipedia.org/wiki/Linear_congruential_generator#Parameters_in_common_use
*/
static int self_test_rng(void *ctx, unsigned char *out, size_t len)
{
static uint32_t state = 42;
(void) ctx;
for (size_t i = 0; i < len; i++) {
state = state * 1664525u + 1013904223u;
out[i] = (unsigned char) state;
}
return 0;
}
/* Load my private keys and generate the corresponding public keys */
static int ecjpake_test_load(mbedtls_ecjpake_context *ctx,
const unsigned char *xm1, size_t len1,
const unsigned char *xm2, size_t len2)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
MBEDTLS_MPI_CHK(mbedtls_mpi_read_binary(&ctx->xm1, xm1, len1));
MBEDTLS_MPI_CHK(mbedtls_mpi_read_binary(&ctx->xm2, xm2, len2));
MBEDTLS_MPI_CHK(mbedtls_ecp_mul(&ctx->grp, &ctx->Xm1, &ctx->xm1,
&ctx->grp.G, self_test_rng, NULL));
MBEDTLS_MPI_CHK(mbedtls_ecp_mul(&ctx->grp, &ctx->Xm2, &ctx->xm2,
&ctx->grp.G, self_test_rng, NULL));
cleanup:
return ret;
}
#endif /* ! MBEDTLS_ECJPAKE_ALT */
/* For tests we don't need a secure RNG;
* use the LGC from Numerical Recipes for simplicity */
static int ecjpake_lgc(void *p, unsigned char *out, size_t len)
{
static uint32_t x = 42;
(void) p;
while (len > 0) {
size_t use_len = len > 4 ? 4 : len;
x = 1664525 * x + 1013904223;
memcpy(out, &x, use_len);
out += use_len;
len -= use_len;
}
return 0;
}
#define TEST_ASSERT(x) \
do { \
if (x) \
ret = 0; \
else \
{ \
ret = 1; \
goto cleanup; \
} \
} while (0)
/*
* Checkup routine
*/
int mbedtls_ecjpake_self_test(int verbose)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
mbedtls_ecjpake_context cli;
mbedtls_ecjpake_context srv;
unsigned char buf[512], pms[32];
size_t len, pmslen;
mbedtls_ecjpake_init(&cli);
mbedtls_ecjpake_init(&srv);
if (verbose != 0) {
mbedtls_printf(" ECJPAKE test #0 (setup): ");
}
TEST_ASSERT(mbedtls_ecjpake_setup(&cli, MBEDTLS_ECJPAKE_CLIENT,
MBEDTLS_MD_SHA256, MBEDTLS_ECP_DP_SECP256R1,
ecjpake_test_password,
sizeof(ecjpake_test_password)) == 0);
TEST_ASSERT(mbedtls_ecjpake_setup(&srv, MBEDTLS_ECJPAKE_SERVER,
MBEDTLS_MD_SHA256, MBEDTLS_ECP_DP_SECP256R1,
ecjpake_test_password,
sizeof(ecjpake_test_password)) == 0);
if (verbose != 0) {
mbedtls_printf("passed\n");
}
if (verbose != 0) {
mbedtls_printf(" ECJPAKE test #1 (random handshake): ");
}
TEST_ASSERT(mbedtls_ecjpake_write_round_one(&cli,
buf, sizeof(buf), &len, ecjpake_lgc, NULL) == 0);
TEST_ASSERT(mbedtls_ecjpake_read_round_one(&srv, buf, len) == 0);
TEST_ASSERT(mbedtls_ecjpake_write_round_one(&srv,
buf, sizeof(buf), &len, ecjpake_lgc, NULL) == 0);
TEST_ASSERT(mbedtls_ecjpake_read_round_one(&cli, buf, len) == 0);
TEST_ASSERT(mbedtls_ecjpake_write_round_two(&srv,
buf, sizeof(buf), &len, ecjpake_lgc, NULL) == 0);
TEST_ASSERT(mbedtls_ecjpake_read_round_two(&cli, buf, len) == 0);
TEST_ASSERT(mbedtls_ecjpake_derive_secret(&cli,
pms, sizeof(pms), &pmslen, ecjpake_lgc, NULL) == 0);
TEST_ASSERT(mbedtls_ecjpake_write_round_two(&cli,
buf, sizeof(buf), &len, ecjpake_lgc, NULL) == 0);
TEST_ASSERT(mbedtls_ecjpake_read_round_two(&srv, buf, len) == 0);
TEST_ASSERT(mbedtls_ecjpake_derive_secret(&srv,
buf, sizeof(buf), &len, ecjpake_lgc, NULL) == 0);
TEST_ASSERT(len == pmslen);
TEST_ASSERT(memcmp(buf, pms, len) == 0);
if (verbose != 0) {
mbedtls_printf("passed\n");
}
#if !defined(MBEDTLS_ECJPAKE_ALT)
/* 'reference handshake' tests can only be run against implementations
* for which we have 100% control over how the random ephemeral keys
* are generated. This is only the case for the internal mbed TLS
* implementation, so these tests are skipped in case the internal
* implementation is swapped out for an alternative one. */
if (verbose != 0) {
mbedtls_printf(" ECJPAKE test #2 (reference handshake): ");
}
/* Simulate generation of round one */
MBEDTLS_MPI_CHK(ecjpake_test_load(&cli,
ecjpake_test_x1, sizeof(ecjpake_test_x1),
ecjpake_test_x2, sizeof(ecjpake_test_x2)));
MBEDTLS_MPI_CHK(ecjpake_test_load(&srv,
ecjpake_test_x3, sizeof(ecjpake_test_x3),
ecjpake_test_x4, sizeof(ecjpake_test_x4)));
/* Read round one */
TEST_ASSERT(mbedtls_ecjpake_read_round_one(&srv,
ecjpake_test_cli_one,
sizeof(ecjpake_test_cli_one)) == 0);
TEST_ASSERT(mbedtls_ecjpake_read_round_one(&cli,
ecjpake_test_srv_one,
sizeof(ecjpake_test_srv_one)) == 0);
/* Skip generation of round two, read round two */
TEST_ASSERT(mbedtls_ecjpake_read_round_two(&cli,
ecjpake_test_srv_two,
sizeof(ecjpake_test_srv_two)) == 0);
TEST_ASSERT(mbedtls_ecjpake_read_round_two(&srv,
ecjpake_test_cli_two,
sizeof(ecjpake_test_cli_two)) == 0);
/* Server derives PMS */
TEST_ASSERT(mbedtls_ecjpake_derive_secret(&srv,
buf, sizeof(buf), &len, ecjpake_lgc, NULL) == 0);
TEST_ASSERT(len == sizeof(ecjpake_test_pms));
TEST_ASSERT(memcmp(buf, ecjpake_test_pms, len) == 0);
/* Server derives K as unsigned binary data */
TEST_ASSERT(mbedtls_ecjpake_write_shared_key(&srv,
buf, sizeof(buf), &len, ecjpake_lgc, NULL) == 0);
TEST_ASSERT(len == sizeof(ecjpake_test_shared_key));
TEST_ASSERT(memcmp(buf, ecjpake_test_shared_key, len) == 0);
memset(buf, 0, len); /* Avoid interferences with next step */
/* Client derives PMS */
TEST_ASSERT(mbedtls_ecjpake_derive_secret(&cli,
buf, sizeof(buf), &len, ecjpake_lgc, NULL) == 0);
TEST_ASSERT(len == sizeof(ecjpake_test_pms));
TEST_ASSERT(memcmp(buf, ecjpake_test_pms, len) == 0);
/* Client derives K as unsigned binary data */
TEST_ASSERT(mbedtls_ecjpake_write_shared_key(&cli,
buf, sizeof(buf), &len, ecjpake_lgc, NULL) == 0);
TEST_ASSERT(len == sizeof(ecjpake_test_shared_key));
TEST_ASSERT(memcmp(buf, ecjpake_test_shared_key, len) == 0);
if (verbose != 0) {
mbedtls_printf("passed\n");
}
#endif /* ! MBEDTLS_ECJPAKE_ALT */
cleanup:
mbedtls_ecjpake_free(&cli);
mbedtls_ecjpake_free(&srv);
if (ret != 0) {
if (verbose != 0) {
mbedtls_printf("failed\n");
}
ret = 1;
}
if (verbose != 0) {
mbedtls_printf("\n");
}
return ret;
}
#undef TEST_ASSERT
#endif /* MBEDTLS_ECP_DP_SECP256R1_ENABLED && MBEDTLS_MD_CAN_SHA256 */
#endif /* MBEDTLS_SELF_TEST */
#endif /* MBEDTLS_ECJPAKE_C */
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