| /* |
| * Diffie-Hellman-Merkle key exchange |
| * |
| * Copyright The Mbed TLS Contributors |
| * SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later |
| */ |
| /* |
| * The following sources were referenced in the design of this implementation |
| * of the Diffie-Hellman-Merkle algorithm: |
| * |
| * [1] Handbook of Applied Cryptography - 1997, Chapter 12 |
| * Menezes, van Oorschot and Vanstone |
| * |
| */ |
| |
| #include "common.h" |
| |
| #if defined(MBEDTLS_DHM_C) |
| |
| #include "mbedtls/dhm.h" |
| #include "mbedtls/platform_util.h" |
| #include "mbedtls/error.h" |
| |
| #include <string.h> |
| |
| #if defined(MBEDTLS_PEM_PARSE_C) |
| #include "mbedtls/pem.h" |
| #endif |
| |
| #if defined(MBEDTLS_ASN1_PARSE_C) |
| #include "mbedtls/asn1.h" |
| #endif |
| |
| #include "mbedtls/platform.h" |
| |
| #if !defined(MBEDTLS_DHM_ALT) |
| |
| /* |
| * helper to validate the mbedtls_mpi size and import it |
| */ |
| static int dhm_read_bignum(mbedtls_mpi *X, |
| unsigned char **p, |
| const unsigned char *end) |
| { |
| int ret, n; |
| |
| if (end - *p < 2) { |
| return MBEDTLS_ERR_DHM_BAD_INPUT_DATA; |
| } |
| |
| n = MBEDTLS_GET_UINT16_BE(*p, 0); |
| (*p) += 2; |
| |
| if ((size_t) (end - *p) < (size_t) n) { |
| return MBEDTLS_ERR_DHM_BAD_INPUT_DATA; |
| } |
| |
| if ((ret = mbedtls_mpi_read_binary(X, *p, n)) != 0) { |
| return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_DHM_READ_PARAMS_FAILED, ret); |
| } |
| |
| (*p) += n; |
| |
| return 0; |
| } |
| |
| /* |
| * Verify sanity of parameter with regards to P |
| * |
| * Parameter should be: 2 <= public_param <= P - 2 |
| * |
| * This means that we need to return an error if |
| * public_param < 2 or public_param > P-2 |
| * |
| * For more information on the attack, see: |
| * http://www.cl.cam.ac.uk/~rja14/Papers/psandqs.pdf |
| * http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2005-2643 |
| */ |
| static int dhm_check_range(const mbedtls_mpi *param, const mbedtls_mpi *P) |
| { |
| mbedtls_mpi U; |
| int ret = 0; |
| |
| mbedtls_mpi_init(&U); |
| |
| MBEDTLS_MPI_CHK(mbedtls_mpi_sub_int(&U, P, 2)); |
| |
| if (mbedtls_mpi_cmp_int(param, 2) < 0 || |
| mbedtls_mpi_cmp_mpi(param, &U) > 0) { |
| ret = MBEDTLS_ERR_DHM_BAD_INPUT_DATA; |
| } |
| |
| cleanup: |
| mbedtls_mpi_free(&U); |
| return ret; |
| } |
| |
| void mbedtls_dhm_init(mbedtls_dhm_context *ctx) |
| { |
| memset(ctx, 0, sizeof(mbedtls_dhm_context)); |
| } |
| |
| size_t mbedtls_dhm_get_bitlen(const mbedtls_dhm_context *ctx) |
| { |
| return mbedtls_mpi_bitlen(&ctx->P); |
| } |
| |
| size_t mbedtls_dhm_get_len(const mbedtls_dhm_context *ctx) |
| { |
| return mbedtls_mpi_size(&ctx->P); |
| } |
| |
| int mbedtls_dhm_get_value(const mbedtls_dhm_context *ctx, |
| mbedtls_dhm_parameter param, |
| mbedtls_mpi *dest) |
| { |
| const mbedtls_mpi *src = NULL; |
| switch (param) { |
| case MBEDTLS_DHM_PARAM_P: |
| src = &ctx->P; |
| break; |
| case MBEDTLS_DHM_PARAM_G: |
| src = &ctx->G; |
| break; |
| case MBEDTLS_DHM_PARAM_X: |
| src = &ctx->X; |
| break; |
| case MBEDTLS_DHM_PARAM_GX: |
| src = &ctx->GX; |
| break; |
| case MBEDTLS_DHM_PARAM_GY: |
| src = &ctx->GY; |
| break; |
| case MBEDTLS_DHM_PARAM_K: |
| src = &ctx->K; |
| break; |
| default: |
| return MBEDTLS_ERR_DHM_BAD_INPUT_DATA; |
| } |
| return mbedtls_mpi_copy(dest, src); |
| } |
| |
| /* |
| * Parse the ServerKeyExchange parameters |
| */ |
| int mbedtls_dhm_read_params(mbedtls_dhm_context *ctx, |
| unsigned char **p, |
| const unsigned char *end) |
| { |
| int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| |
| if ((ret = dhm_read_bignum(&ctx->P, p, end)) != 0 || |
| (ret = dhm_read_bignum(&ctx->G, p, end)) != 0 || |
| (ret = dhm_read_bignum(&ctx->GY, p, end)) != 0) { |
| return ret; |
| } |
| |
| if ((ret = dhm_check_range(&ctx->GY, &ctx->P)) != 0) { |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * Pick a random R in the range [2, M-2] for blinding or key generation. |
| */ |
| static int dhm_random_below(mbedtls_mpi *R, const mbedtls_mpi *M, |
| int (*f_rng)(void *, unsigned char *, size_t), void *p_rng) |
| { |
| int ret; |
| |
| MBEDTLS_MPI_CHK(mbedtls_mpi_random(R, 3, M, f_rng, p_rng)); |
| MBEDTLS_MPI_CHK(mbedtls_mpi_sub_int(R, R, 1)); |
| |
| cleanup: |
| return ret; |
| } |
| |
| static int dhm_make_common(mbedtls_dhm_context *ctx, int x_size, |
| int (*f_rng)(void *, unsigned char *, size_t), |
| void *p_rng) |
| { |
| int ret = 0; |
| |
| if (mbedtls_mpi_cmp_int(&ctx->P, 0) == 0) { |
| return MBEDTLS_ERR_DHM_BAD_INPUT_DATA; |
| } |
| if (x_size < 0) { |
| return MBEDTLS_ERR_DHM_BAD_INPUT_DATA; |
| } |
| |
| if ((unsigned) x_size < mbedtls_mpi_size(&ctx->P)) { |
| MBEDTLS_MPI_CHK(mbedtls_mpi_fill_random(&ctx->X, x_size, f_rng, p_rng)); |
| } else { |
| /* Generate X as large as possible ( <= P - 2 ) */ |
| ret = dhm_random_below(&ctx->X, &ctx->P, f_rng, p_rng); |
| if (ret == MBEDTLS_ERR_MPI_NOT_ACCEPTABLE) { |
| return MBEDTLS_ERR_DHM_MAKE_PARAMS_FAILED; |
| } |
| if (ret != 0) { |
| return ret; |
| } |
| } |
| |
| /* |
| * Calculate GX = G^X mod P |
| */ |
| MBEDTLS_MPI_CHK(mbedtls_mpi_exp_mod(&ctx->GX, &ctx->G, &ctx->X, |
| &ctx->P, &ctx->RP)); |
| |
| if ((ret = dhm_check_range(&ctx->GX, &ctx->P)) != 0) { |
| return ret; |
| } |
| |
| cleanup: |
| return ret; |
| } |
| |
| /* |
| * Setup and write the ServerKeyExchange parameters |
| */ |
| int mbedtls_dhm_make_params(mbedtls_dhm_context *ctx, int x_size, |
| unsigned char *output, size_t *olen, |
| int (*f_rng)(void *, unsigned char *, size_t), |
| void *p_rng) |
| { |
| int ret; |
| size_t n1, n2, n3; |
| unsigned char *p; |
| |
| ret = dhm_make_common(ctx, x_size, f_rng, p_rng); |
| if (ret != 0) { |
| goto cleanup; |
| } |
| |
| /* |
| * Export P, G, GX. RFC 5246 §4.4 states that "leading zero octets are |
| * not required". We omit leading zeros for compactness. |
| */ |
| #define DHM_MPI_EXPORT(X, n) \ |
| do { \ |
| MBEDTLS_MPI_CHK(mbedtls_mpi_write_binary((X), \ |
| p + 2, \ |
| (n))); \ |
| *p++ = MBEDTLS_BYTE_1(n); \ |
| *p++ = MBEDTLS_BYTE_0(n); \ |
| p += (n); \ |
| } while (0) |
| |
| n1 = mbedtls_mpi_size(&ctx->P); |
| n2 = mbedtls_mpi_size(&ctx->G); |
| n3 = mbedtls_mpi_size(&ctx->GX); |
| |
| p = output; |
| DHM_MPI_EXPORT(&ctx->P, n1); |
| DHM_MPI_EXPORT(&ctx->G, n2); |
| DHM_MPI_EXPORT(&ctx->GX, n3); |
| |
| *olen = (size_t) (p - output); |
| |
| cleanup: |
| if (ret != 0 && ret > -128) { |
| ret = MBEDTLS_ERROR_ADD(MBEDTLS_ERR_DHM_MAKE_PARAMS_FAILED, ret); |
| } |
| return ret; |
| } |
| |
| /* |
| * Set prime modulus and generator |
| */ |
| int mbedtls_dhm_set_group(mbedtls_dhm_context *ctx, |
| const mbedtls_mpi *P, |
| const mbedtls_mpi *G) |
| { |
| int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| |
| if ((ret = mbedtls_mpi_copy(&ctx->P, P)) != 0 || |
| (ret = mbedtls_mpi_copy(&ctx->G, G)) != 0) { |
| return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_DHM_SET_GROUP_FAILED, ret); |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * Import the peer's public value G^Y |
| */ |
| int mbedtls_dhm_read_public(mbedtls_dhm_context *ctx, |
| const unsigned char *input, size_t ilen) |
| { |
| int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| |
| if (ilen < 1 || ilen > mbedtls_dhm_get_len(ctx)) { |
| return MBEDTLS_ERR_DHM_BAD_INPUT_DATA; |
| } |
| |
| if ((ret = mbedtls_mpi_read_binary(&ctx->GY, input, ilen)) != 0) { |
| return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_DHM_READ_PUBLIC_FAILED, ret); |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * Create own private value X and export G^X |
| */ |
| int mbedtls_dhm_make_public(mbedtls_dhm_context *ctx, int x_size, |
| unsigned char *output, size_t olen, |
| int (*f_rng)(void *, unsigned char *, size_t), |
| void *p_rng) |
| { |
| int ret; |
| |
| if (olen < 1 || olen > mbedtls_dhm_get_len(ctx)) { |
| return MBEDTLS_ERR_DHM_BAD_INPUT_DATA; |
| } |
| |
| ret = dhm_make_common(ctx, x_size, f_rng, p_rng); |
| if (ret == MBEDTLS_ERR_DHM_MAKE_PARAMS_FAILED) { |
| return MBEDTLS_ERR_DHM_MAKE_PUBLIC_FAILED; |
| } |
| if (ret != 0) { |
| goto cleanup; |
| } |
| |
| MBEDTLS_MPI_CHK(mbedtls_mpi_write_binary(&ctx->GX, output, olen)); |
| |
| cleanup: |
| if (ret != 0 && ret > -128) { |
| ret = MBEDTLS_ERROR_ADD(MBEDTLS_ERR_DHM_MAKE_PUBLIC_FAILED, ret); |
| } |
| return ret; |
| } |
| |
| |
| /* |
| * Use the blinding method and optimisation suggested in section 10 of: |
| * KOCHER, Paul C. Timing attacks on implementations of Diffie-Hellman, RSA, |
| * DSS, and other systems. In : Advances in Cryptology-CRYPTO'96. Springer |
| * Berlin Heidelberg, 1996. p. 104-113. |
| */ |
| static int dhm_update_blinding(mbedtls_dhm_context *ctx, |
| int (*f_rng)(void *, unsigned char *, size_t), void *p_rng) |
| { |
| int ret; |
| mbedtls_mpi R; |
| |
| mbedtls_mpi_init(&R); |
| |
| /* |
| * Don't use any blinding the first time a particular X is used, |
| * but remember it to use blinding next time. |
| */ |
| if (mbedtls_mpi_cmp_mpi(&ctx->X, &ctx->pX) != 0) { |
| MBEDTLS_MPI_CHK(mbedtls_mpi_copy(&ctx->pX, &ctx->X)); |
| MBEDTLS_MPI_CHK(mbedtls_mpi_lset(&ctx->Vi, 1)); |
| MBEDTLS_MPI_CHK(mbedtls_mpi_lset(&ctx->Vf, 1)); |
| |
| return 0; |
| } |
| |
| /* |
| * Ok, we need blinding. Can we re-use existing values? |
| * If yes, just update them by squaring them. |
| */ |
| if (mbedtls_mpi_cmp_int(&ctx->Vi, 1) != 0) { |
| MBEDTLS_MPI_CHK(mbedtls_mpi_mul_mpi(&ctx->Vi, &ctx->Vi, &ctx->Vi)); |
| MBEDTLS_MPI_CHK(mbedtls_mpi_mod_mpi(&ctx->Vi, &ctx->Vi, &ctx->P)); |
| |
| MBEDTLS_MPI_CHK(mbedtls_mpi_mul_mpi(&ctx->Vf, &ctx->Vf, &ctx->Vf)); |
| MBEDTLS_MPI_CHK(mbedtls_mpi_mod_mpi(&ctx->Vf, &ctx->Vf, &ctx->P)); |
| |
| return 0; |
| } |
| |
| /* |
| * We need to generate blinding values from scratch |
| */ |
| |
| /* Vi = random( 2, P-2 ) */ |
| MBEDTLS_MPI_CHK(dhm_random_below(&ctx->Vi, &ctx->P, f_rng, p_rng)); |
| |
| /* Vf = Vi^-X mod P |
| * First compute Vi^-1 = R * (R Vi)^-1, (avoiding leaks from inv_mod), |
| * then elevate to the Xth power. */ |
| MBEDTLS_MPI_CHK(dhm_random_below(&R, &ctx->P, f_rng, p_rng)); |
| MBEDTLS_MPI_CHK(mbedtls_mpi_mul_mpi(&ctx->Vf, &ctx->Vi, &R)); |
| MBEDTLS_MPI_CHK(mbedtls_mpi_mod_mpi(&ctx->Vf, &ctx->Vf, &ctx->P)); |
| MBEDTLS_MPI_CHK(mbedtls_mpi_inv_mod(&ctx->Vf, &ctx->Vf, &ctx->P)); |
| MBEDTLS_MPI_CHK(mbedtls_mpi_mul_mpi(&ctx->Vf, &ctx->Vf, &R)); |
| MBEDTLS_MPI_CHK(mbedtls_mpi_mod_mpi(&ctx->Vf, &ctx->Vf, &ctx->P)); |
| |
| MBEDTLS_MPI_CHK(mbedtls_mpi_exp_mod(&ctx->Vf, &ctx->Vf, &ctx->X, &ctx->P, &ctx->RP)); |
| |
| cleanup: |
| mbedtls_mpi_free(&R); |
| |
| return ret; |
| } |
| |
| /* |
| * Derive and export the shared secret (G^Y)^X mod P |
| */ |
| int mbedtls_dhm_calc_secret(mbedtls_dhm_context *ctx, |
| unsigned char *output, size_t output_size, size_t *olen, |
| int (*f_rng)(void *, unsigned char *, size_t), |
| void *p_rng) |
| { |
| int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| mbedtls_mpi GYb; |
| |
| if (f_rng == NULL) { |
| return MBEDTLS_ERR_DHM_BAD_INPUT_DATA; |
| } |
| |
| if (output_size < mbedtls_dhm_get_len(ctx)) { |
| return MBEDTLS_ERR_DHM_BAD_INPUT_DATA; |
| } |
| |
| if ((ret = dhm_check_range(&ctx->GY, &ctx->P)) != 0) { |
| return ret; |
| } |
| |
| mbedtls_mpi_init(&GYb); |
| |
| /* Blind peer's value */ |
| MBEDTLS_MPI_CHK(dhm_update_blinding(ctx, f_rng, p_rng)); |
| MBEDTLS_MPI_CHK(mbedtls_mpi_mul_mpi(&GYb, &ctx->GY, &ctx->Vi)); |
| MBEDTLS_MPI_CHK(mbedtls_mpi_mod_mpi(&GYb, &GYb, &ctx->P)); |
| |
| /* Do modular exponentiation */ |
| MBEDTLS_MPI_CHK(mbedtls_mpi_exp_mod(&ctx->K, &GYb, &ctx->X, |
| &ctx->P, &ctx->RP)); |
| |
| /* Unblind secret value */ |
| MBEDTLS_MPI_CHK(mbedtls_mpi_mul_mpi(&ctx->K, &ctx->K, &ctx->Vf)); |
| MBEDTLS_MPI_CHK(mbedtls_mpi_mod_mpi(&ctx->K, &ctx->K, &ctx->P)); |
| |
| /* Output the secret without any leading zero byte. This is mandatory |
| * for TLS per RFC 5246 §8.1.2. */ |
| *olen = mbedtls_mpi_size(&ctx->K); |
| MBEDTLS_MPI_CHK(mbedtls_mpi_write_binary(&ctx->K, output, *olen)); |
| |
| cleanup: |
| mbedtls_mpi_free(&GYb); |
| |
| if (ret != 0) { |
| return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_DHM_CALC_SECRET_FAILED, ret); |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * Free the components of a DHM key |
| */ |
| void mbedtls_dhm_free(mbedtls_dhm_context *ctx) |
| { |
| if (ctx == NULL) { |
| return; |
| } |
| |
| mbedtls_mpi_free(&ctx->pX); |
| mbedtls_mpi_free(&ctx->Vf); |
| mbedtls_mpi_free(&ctx->Vi); |
| mbedtls_mpi_free(&ctx->RP); |
| mbedtls_mpi_free(&ctx->K); |
| mbedtls_mpi_free(&ctx->GY); |
| mbedtls_mpi_free(&ctx->GX); |
| mbedtls_mpi_free(&ctx->X); |
| mbedtls_mpi_free(&ctx->G); |
| mbedtls_mpi_free(&ctx->P); |
| |
| mbedtls_platform_zeroize(ctx, sizeof(mbedtls_dhm_context)); |
| } |
| |
| #if defined(MBEDTLS_ASN1_PARSE_C) |
| /* |
| * Parse DHM parameters |
| */ |
| int mbedtls_dhm_parse_dhm(mbedtls_dhm_context *dhm, const unsigned char *dhmin, |
| size_t dhminlen) |
| { |
| int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| size_t len; |
| unsigned char *p, *end; |
| #if defined(MBEDTLS_PEM_PARSE_C) |
| mbedtls_pem_context pem; |
| #endif /* MBEDTLS_PEM_PARSE_C */ |
| |
| #if defined(MBEDTLS_PEM_PARSE_C) |
| mbedtls_pem_init(&pem); |
| |
| /* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */ |
| if (dhminlen == 0 || dhmin[dhminlen - 1] != '\0') { |
| ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT; |
| } else { |
| ret = mbedtls_pem_read_buffer(&pem, |
| "-----BEGIN DH PARAMETERS-----", |
| "-----END DH PARAMETERS-----", |
| dhmin, NULL, 0, &dhminlen); |
| } |
| |
| if (ret == 0) { |
| /* |
| * Was PEM encoded |
| */ |
| dhminlen = pem.buflen; |
| } else if (ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT) { |
| goto exit; |
| } |
| |
| p = (ret == 0) ? pem.buf : (unsigned char *) dhmin; |
| #else |
| p = (unsigned char *) dhmin; |
| #endif /* MBEDTLS_PEM_PARSE_C */ |
| end = p + dhminlen; |
| |
| /* |
| * DHParams ::= SEQUENCE { |
| * prime INTEGER, -- P |
| * generator INTEGER, -- g |
| * privateValueLength INTEGER OPTIONAL |
| * } |
| */ |
| if ((ret = mbedtls_asn1_get_tag(&p, end, &len, |
| MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE)) != 0) { |
| ret = MBEDTLS_ERROR_ADD(MBEDTLS_ERR_DHM_INVALID_FORMAT, ret); |
| goto exit; |
| } |
| |
| end = p + len; |
| |
| if ((ret = mbedtls_asn1_get_mpi(&p, end, &dhm->P)) != 0 || |
| (ret = mbedtls_asn1_get_mpi(&p, end, &dhm->G)) != 0) { |
| ret = MBEDTLS_ERROR_ADD(MBEDTLS_ERR_DHM_INVALID_FORMAT, ret); |
| goto exit; |
| } |
| |
| if (p != end) { |
| /* This might be the optional privateValueLength. |
| * If so, we can cleanly discard it */ |
| mbedtls_mpi rec; |
| mbedtls_mpi_init(&rec); |
| ret = mbedtls_asn1_get_mpi(&p, end, &rec); |
| mbedtls_mpi_free(&rec); |
| if (ret != 0) { |
| ret = MBEDTLS_ERROR_ADD(MBEDTLS_ERR_DHM_INVALID_FORMAT, ret); |
| goto exit; |
| } |
| if (p != end) { |
| ret = MBEDTLS_ERROR_ADD(MBEDTLS_ERR_DHM_INVALID_FORMAT, |
| MBEDTLS_ERR_ASN1_LENGTH_MISMATCH); |
| goto exit; |
| } |
| } |
| |
| ret = 0; |
| |
| exit: |
| #if defined(MBEDTLS_PEM_PARSE_C) |
| mbedtls_pem_free(&pem); |
| #endif |
| if (ret != 0) { |
| mbedtls_dhm_free(dhm); |
| } |
| |
| return ret; |
| } |
| |
| #if defined(MBEDTLS_FS_IO) |
| /* |
| * Load all data from a file into a given buffer. |
| * |
| * The file is expected to contain either PEM or DER encoded data. |
| * A terminating null byte is always appended. It is included in the announced |
| * length only if the data looks like it is PEM encoded. |
| */ |
| static int load_file(const char *path, unsigned char **buf, size_t *n) |
| { |
| FILE *f; |
| long size; |
| |
| if ((f = fopen(path, "rb")) == NULL) { |
| return MBEDTLS_ERR_DHM_FILE_IO_ERROR; |
| } |
| /* The data loaded here is public, so don't bother disabling buffering. */ |
| |
| fseek(f, 0, SEEK_END); |
| if ((size = ftell(f)) == -1) { |
| fclose(f); |
| return MBEDTLS_ERR_DHM_FILE_IO_ERROR; |
| } |
| fseek(f, 0, SEEK_SET); |
| |
| *n = (size_t) size; |
| |
| if (*n + 1 == 0 || |
| (*buf = mbedtls_calloc(1, *n + 1)) == NULL) { |
| fclose(f); |
| return MBEDTLS_ERR_DHM_ALLOC_FAILED; |
| } |
| |
| if (fread(*buf, 1, *n, f) != *n) { |
| fclose(f); |
| |
| mbedtls_zeroize_and_free(*buf, *n + 1); |
| |
| return MBEDTLS_ERR_DHM_FILE_IO_ERROR; |
| } |
| |
| fclose(f); |
| |
| (*buf)[*n] = '\0'; |
| |
| if (strstr((const char *) *buf, "-----BEGIN ") != NULL) { |
| ++*n; |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * Load and parse DHM parameters |
| */ |
| int mbedtls_dhm_parse_dhmfile(mbedtls_dhm_context *dhm, const char *path) |
| { |
| int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| size_t n; |
| unsigned char *buf; |
| |
| if ((ret = load_file(path, &buf, &n)) != 0) { |
| return ret; |
| } |
| |
| ret = mbedtls_dhm_parse_dhm(dhm, buf, n); |
| |
| mbedtls_zeroize_and_free(buf, n); |
| |
| return ret; |
| } |
| #endif /* MBEDTLS_FS_IO */ |
| #endif /* MBEDTLS_ASN1_PARSE_C */ |
| #endif /* MBEDTLS_DHM_ALT */ |
| |
| #if defined(MBEDTLS_SELF_TEST) |
| |
| #if defined(MBEDTLS_PEM_PARSE_C) |
| static const char mbedtls_test_dhm_params[] = |
| "-----BEGIN DH PARAMETERS-----\r\n" |
| "MIGHAoGBAJ419DBEOgmQTzo5qXl5fQcN9TN455wkOL7052HzxxRVMyhYmwQcgJvh\r\n" |
| "1sa18fyfR9OiVEMYglOpkqVoGLN7qd5aQNNi5W7/C+VBdHTBJcGZJyyP5B3qcz32\r\n" |
| "9mLJKudlVudV0Qxk5qUJaPZ/xupz0NyoVpviuiBOI1gNi8ovSXWzAgEC\r\n" |
| "-----END DH PARAMETERS-----\r\n"; |
| #else /* MBEDTLS_PEM_PARSE_C */ |
| static const char mbedtls_test_dhm_params[] = { |
| 0x30, 0x81, 0x87, 0x02, 0x81, 0x81, 0x00, 0x9e, 0x35, 0xf4, 0x30, 0x44, |
| 0x3a, 0x09, 0x90, 0x4f, 0x3a, 0x39, 0xa9, 0x79, 0x79, 0x7d, 0x07, 0x0d, |
| 0xf5, 0x33, 0x78, 0xe7, 0x9c, 0x24, 0x38, 0xbe, 0xf4, 0xe7, 0x61, 0xf3, |
| 0xc7, 0x14, 0x55, 0x33, 0x28, 0x58, 0x9b, 0x04, 0x1c, 0x80, 0x9b, 0xe1, |
| 0xd6, 0xc6, 0xb5, 0xf1, 0xfc, 0x9f, 0x47, 0xd3, 0xa2, 0x54, 0x43, 0x18, |
| 0x82, 0x53, 0xa9, 0x92, 0xa5, 0x68, 0x18, 0xb3, 0x7b, 0xa9, 0xde, 0x5a, |
| 0x40, 0xd3, 0x62, 0xe5, 0x6e, 0xff, 0x0b, 0xe5, 0x41, 0x74, 0x74, 0xc1, |
| 0x25, 0xc1, 0x99, 0x27, 0x2c, 0x8f, 0xe4, 0x1d, 0xea, 0x73, 0x3d, 0xf6, |
| 0xf6, 0x62, 0xc9, 0x2a, 0xe7, 0x65, 0x56, 0xe7, 0x55, 0xd1, 0x0c, 0x64, |
| 0xe6, 0xa5, 0x09, 0x68, 0xf6, 0x7f, 0xc6, 0xea, 0x73, 0xd0, 0xdc, 0xa8, |
| 0x56, 0x9b, 0xe2, 0xba, 0x20, 0x4e, 0x23, 0x58, 0x0d, 0x8b, 0xca, 0x2f, |
| 0x49, 0x75, 0xb3, 0x02, 0x01, 0x02 |
| }; |
| #endif /* MBEDTLS_PEM_PARSE_C */ |
| |
| static const size_t mbedtls_test_dhm_params_len = sizeof(mbedtls_test_dhm_params); |
| |
| /* |
| * Checkup routine |
| */ |
| int mbedtls_dhm_self_test(int verbose) |
| { |
| int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| mbedtls_dhm_context dhm; |
| |
| mbedtls_dhm_init(&dhm); |
| |
| if (verbose != 0) { |
| mbedtls_printf(" DHM parameter load: "); |
| } |
| |
| if ((ret = mbedtls_dhm_parse_dhm(&dhm, |
| (const unsigned char *) mbedtls_test_dhm_params, |
| mbedtls_test_dhm_params_len)) != 0) { |
| if (verbose != 0) { |
| mbedtls_printf("failed\n"); |
| } |
| |
| ret = 1; |
| goto exit; |
| } |
| |
| if (verbose != 0) { |
| mbedtls_printf("passed\n\n"); |
| } |
| |
| exit: |
| mbedtls_dhm_free(&dhm); |
| |
| return ret; |
| } |
| |
| #endif /* MBEDTLS_SELF_TEST */ |
| |
| #endif /* MBEDTLS_DHM_C */ |