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-rw-r--r--library/ecjpake.c1216
1 files changed, 1216 insertions, 0 deletions
diff --git a/library/ecjpake.c b/library/ecjpake.c
new file mode 100644
index 00000000000..cdf5d7ea46e
--- /dev/null
+++ b/library/ecjpake.c
@@ -0,0 +1,1216 @@
+/*
+ * Elliptic curve J-PAKE
+ *
+ * Copyright The Mbed TLS Contributors
+ * SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
+ */
+
+/*
+ * 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 <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, (size_t) (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_MD_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, (size_t) (p - buf), hash));
+
+ /* Turn it into an integer mod n */
+ MBEDTLS_MPI_CHK(mbedtls_mpi_read_binary(h, hash,
+ mbedtls_md_get_size_from_type(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, (size_t) (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, (size_t) (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, (size_t) (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, (size_t) (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 = (size_t) (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, (size_t) (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, (size_t) (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 = (size_t) (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_md_get_size_from_type(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 */
generated by cgit v1.2.3 (git 2.0.4) at 2025-09-20 22:05:22 +0000