/* * Elliptic curve J-PAKE * * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved * 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. * * This file is part of mbed TLS (https://tls.mbed.org) */ /* * References in the code are to the Thread v1.0 Specification, * available to members of the Thread Group http://threadgroup.org/ */ #if !defined(MBEDTLS_CONFIG_FILE) #include "mbedtls/config.h" #else #include MBEDTLS_CONFIG_FILE #endif #if defined(MBEDTLS_ECJPAKE_C) #include "mbedtls/ecjpake.h" #include <string.h> /* * 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 ] ) /* * Initialize context */ void mbedtls_ecjpake_init( mbedtls_ecjpake_context *ctx ) { if( ctx == NULL ) return; ctx->md_info = NULL; 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_info = NULL; 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; ctx->role = role; if( ( ctx->md_info = mbedtls_md_info_from_type( hash ) ) == NULL ) return( MBEDTLS_ERR_MD_FEATURE_UNAVAILABLE ); 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 ); } /* * Check if context is ready for use */ int mbedtls_ecjpake_check( const mbedtls_ecjpake_context *ctx ) { if( ctx->md_info == NULL || 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; 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 ); (*p)[0] = (unsigned char)( ( len >> 24 ) & 0xFF ); (*p)[1] = (unsigned char)( ( len >> 16 ) & 0xFF ); (*p)[2] = (unsigned char)( ( len >> 8 ) & 0xFF ); (*p)[3] = (unsigned char)( ( len ) & 0xFF ); *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_info_t *md_info, 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; 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 ); *p++ = (unsigned char)( ( id_len >> 24 ) & 0xFF ); *p++ = (unsigned char)( ( id_len >> 16 ) & 0xFF ); *p++ = (unsigned char)( ( id_len >> 8 ) & 0xFF ); *p++ = (unsigned char)( ( id_len ) & 0xFF ); 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_md( md_info, buf, p - buf, hash ); /* Turn it into an integer mod n */ MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( h, hash, mbedtls_md_get_size( md_info ) ) ); 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_info_t *md_info, 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_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 ) { 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_info, 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_info_t *md_info, 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_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_info, 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)++ = (unsigned char)( len & 0xFF ); 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_info_t *md_info, 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; 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_info, 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_info_t *md_info, 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; 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_info, 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 * Ouputs: verified peer public keys Xa, Xb */ static int ecjpake_kkpp_read( const mbedtls_md_info_t *md_info, 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; 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_info, grp, pf, G, Xa, id, &p, end ) ); MBEDTLS_MPI_CHK( ecjpake_kkp_read( md_info, 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_info_t *md_info, 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; unsigned char *p = buf; const unsigned char *end = buf + len; MBEDTLS_MPI_CHK( ecjpake_kkp_write( md_info, grp, pf, G, xm1, Xa, id, &p, end, f_rng, p_rng ) ); MBEDTLS_MPI_CHK( ecjpake_kkp_write( md_info, 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_info, &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_info, &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_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; 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_info, &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_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_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_info, &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) */ 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_ecp_point K; mbedtls_mpi m_xm2_s, one; unsigned char kx[MBEDTLS_ECP_MAX_BYTES]; size_t x_bytes; *olen = mbedtls_md_get_size( ctx->md_info ); if( len < *olen ) return( MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL ); mbedtls_ecp_point_init( &K ); 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 ) ); /* 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_md( ctx->md_info, kx, x_bytes, buf ) ); cleanup: mbedtls_ecp_point_free( &K ); mbedtls_mpi_free( &m_xm2_s ); mbedtls_mpi_free( &one ); return( ret ); } #undef ID_MINE #undef ID_PEER #if defined(MBEDTLS_SELF_TEST) #if defined(MBEDTLS_PLATFORM_C) #include "mbedtls/platform.h" #else #include <stdio.h> #define mbedtls_printf printf #endif #if !defined(MBEDTLS_ECP_DP_SECP256R1_ENABLED) || \ !defined(MBEDTLS_SHA256_C) 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 }; 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_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 }; /* Load my private keys and generate the correponding 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_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, NULL, NULL ) ); MBEDTLS_MPI_CHK( mbedtls_ecp_mul( &ctx->grp, &ctx->Xm2, &ctx->xm2, &ctx->grp.G, NULL, NULL ) ); cleanup: return( ret ); } /* 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_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( 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 ); 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 ); if( verbose != 0 ) mbedtls_printf( "passed\n" ); 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_SHA256_C */ #endif /* MBEDTLS_SELF_TEST */ #endif /* MBEDTLS_ECJPAKE_C */