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IABSD.fr/src/usr.bin/openssl/ecparam.c
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- usr.bin/openssl/ecparam.c
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/* $OpenBSD: ecparam.c,v 1.18 2019/07/14 03:30:45 guenther Exp $ */ /* * Written by Nils Larsch for the OpenSSL project. */ /* ==================================================================== * Copyright (c) 1998-2005 The OpenSSL Project. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * 3. All advertising materials mentioning features or use of this * software must display the following acknowledgment: * "This product includes software developed by the OpenSSL Project * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" * * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to * endorse or promote products derived from this software without * prior written permission. For written permission, please contact * openssl-core@openssl.org. * * 5. Products derived from this software may not be called "OpenSSL" * nor may "OpenSSL" appear in their names without prior written * permission of the OpenSSL Project. * * 6. Redistributions of any form whatsoever must retain the following * acknowledgment: * "This product includes software developed by the OpenSSL Project * for use in the OpenSSL Toolkit (http://www.openssl.org/)" * * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED * OF THE POSSIBILITY OF SUCH DAMAGE. * ==================================================================== * * This product includes cryptographic software written by Eric Young * (eay@cryptsoft.com). This product includes software written by Tim * Hudson (tjh@cryptsoft.com). * */ /* ==================================================================== * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. * * Portions of the attached software ("Contribution") are developed by * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project. * * The Contribution is licensed pursuant to the OpenSSL open source * license provided above. * * The elliptic curve binary polynomial software is originally written by * Sheueling Chang Shantz and Douglas Stebila of Sun Microsystems Laboratories. * */ #include <openssl/opensslconf.h> #ifndef OPENSSL_NO_EC #include <stdio.h> #include <stdlib.h> #include <string.h> #include <time.h> #include "apps.h" #include <openssl/bio.h> #include <openssl/bn.h> #include <openssl/ec.h> #include <openssl/err.h> #include <openssl/pem.h> #include <openssl/x509.h> static int ecparam_print_var(BIO *, BIGNUM *, const char *, int, unsigned char *); static struct { int C; int asn1_flag; int check; char *curve_name; point_conversion_form_t form; int genkey; char *infile; int informat; int list_curves; int new_asn1_flag; int new_form; int no_seed; int noout; char *outfile; int outformat; int text; } ecparam_config; static int ecparam_opt_form(char *arg) { if (strcmp(arg, "compressed") == 0) ecparam_config.form = POINT_CONVERSION_COMPRESSED; else if (strcmp(arg, "uncompressed") == 0) ecparam_config.form = POINT_CONVERSION_UNCOMPRESSED; else if (strcmp(arg, "hybrid") == 0) ecparam_config.form = POINT_CONVERSION_HYBRID; else return (1); ecparam_config.new_form = 1; return (0); } static int ecparam_opt_enctype(char *arg) { if (strcmp(arg, "explicit") == 0) ecparam_config.asn1_flag = 0; else if (strcmp(arg, "named_curve") == 0) ecparam_config.asn1_flag = OPENSSL_EC_NAMED_CURVE; else return (1); ecparam_config.new_asn1_flag = 1; return (0); } static const struct option ecparam_options[] = { { .name = "C", .desc = "Convert the EC parameters into C code", .type = OPTION_FLAG, .opt.flag = &ecparam_config.C, }, { .name = "check", .desc = "Validate the elliptic curve parameters", .type = OPTION_FLAG, .opt.flag = &ecparam_config.check, }, { .name = "conv_form", .argname = "form", .desc = "Specify point conversion form:\n" " compressed, uncompressed (default), hybrid", .type = OPTION_ARG_FUNC, .opt.argfunc = ecparam_opt_form, }, { .name = "genkey", .desc = "Generate an EC private key using the specified " "parameters", .type = OPTION_FLAG, .opt.flag = &ecparam_config.genkey, }, { .name = "in", .argname = "file", .desc = "Input file to read parameters from (default stdin)", .type = OPTION_ARG, .opt.arg = &ecparam_config.infile, }, { .name = "inform", .argname = "format", .desc = "Input format (DER or PEM)", .type = OPTION_ARG_FORMAT, .opt.value = &ecparam_config.informat, }, { .name = "list_curves", .desc = "Print list of all currently implemented EC " "parameter names", .type = OPTION_FLAG, .opt.flag = &ecparam_config.list_curves, }, { .name = "name", .argname = "curve", .desc = "Use the EC parameters with the specified name", .type = OPTION_ARG, .opt.arg = &ecparam_config.curve_name, }, { .name = "no_seed", .desc = "Do not output seed with explicit parameter encoding", .type = OPTION_FLAG, .opt.flag = &ecparam_config.no_seed, }, { .name = "noout", .desc = "Do not output encoded version of EC parameters", .type = OPTION_FLAG, .opt.flag = &ecparam_config.noout, }, { .name = "out", .argname = "file", .desc = "Output file to write parameters to (default stdout)", .type = OPTION_ARG, .opt.arg = &ecparam_config.outfile, }, { .name = "outform", .argname = "format", .desc = "Output format (DER or PEM)", .type = OPTION_ARG_FORMAT, .opt.value = &ecparam_config.outformat, }, { .name = "param_enc", .argname = "type", .desc = "Specify EC parameter ASN.1 encoding type:\n" " explicit, named_curve (default)", .type = OPTION_ARG_FUNC, .opt.argfunc = ecparam_opt_enctype, }, { .name = "text", .desc = "Print out the EC parameters in human readable form", .type = OPTION_FLAG, .opt.flag = &ecparam_config.text, }, {NULL}, }; static void ecparam_usage(void) { fprintf(stderr, "usage: ecparam [-C] [-check] [-conv_form arg] " " [-genkey]\n" " [-in file] [-inform DER | PEM] [-list_curves] [-name arg]\n" " [-no_seed] [-noout] [-out file] [-outform DER | PEM]\n" " [-param_enc arg] [-text]\n\n"); options_usage(ecparam_options); } int ecparam_main(int argc, char **argv) { BIGNUM *ec_p = NULL, *ec_a = NULL, *ec_b = NULL, *ec_gen = NULL; BIGNUM *ec_order = NULL, *ec_cofactor = NULL; EC_GROUP *group = NULL; unsigned char *buffer = NULL; BIO *in = NULL, *out = NULL; int i, ret = 1; if (single_execution) { if (pledge("stdio cpath wpath rpath", NULL) == -1) { perror("pledge"); exit(1); } } memset(&ecparam_config, 0, sizeof(ecparam_config)); ecparam_config.asn1_flag = OPENSSL_EC_NAMED_CURVE; ecparam_config.form = POINT_CONVERSION_UNCOMPRESSED; ecparam_config.informat = FORMAT_PEM; ecparam_config.outformat = FORMAT_PEM; if (options_parse(argc, argv, ecparam_options, NULL, NULL) != 0) { ecparam_usage(); goto end; } in = BIO_new(BIO_s_file()); out = BIO_new(BIO_s_file()); if ((in == NULL) || (out == NULL)) { ERR_print_errors(bio_err); goto end; } if (ecparam_config.infile == NULL) BIO_set_fp(in, stdin, BIO_NOCLOSE); else { if (BIO_read_filename(in, ecparam_config.infile) <= 0) { perror(ecparam_config.infile); goto end; } } if (ecparam_config.outfile == NULL) { BIO_set_fp(out, stdout, BIO_NOCLOSE); } else { if (BIO_write_filename(out, ecparam_config.outfile) <= 0) { perror(ecparam_config.outfile); goto end; } } if (ecparam_config.list_curves) { EC_builtin_curve *curves = NULL; size_t crv_len = 0; size_t n = 0; crv_len = EC_get_builtin_curves(NULL, 0); curves = reallocarray(NULL, crv_len, sizeof(EC_builtin_curve)); if (curves == NULL) goto end; if (!EC_get_builtin_curves(curves, crv_len)) { free(curves); goto end; } for (n = 0; n < crv_len; n++) { const char *comment; const char *sname; comment = curves[n].comment; sname = OBJ_nid2sn(curves[n].nid); if (comment == NULL) comment = "CURVE DESCRIPTION NOT AVAILABLE"; if (sname == NULL) sname = ""; BIO_printf(out, " %-10s: ", sname); BIO_printf(out, "%s\n", comment); } free(curves); ret = 0; goto end; } if (ecparam_config.curve_name != NULL) { int nid; /* * workaround for the SECG curve names secp192r1 and * secp256r1 (which are the same as the curves prime192v1 and * prime256v1 defined in X9.62) */ if (!strcmp(ecparam_config.curve_name, "secp192r1")) { BIO_printf(bio_err, "using curve name prime192v1 " "instead of secp192r1\n"); nid = NID_X9_62_prime192v1; } else if (!strcmp(ecparam_config.curve_name, "secp256r1")) { BIO_printf(bio_err, "using curve name prime256v1 " "instead of secp256r1\n"); nid = NID_X9_62_prime256v1; } else nid = OBJ_sn2nid(ecparam_config.curve_name); if (nid == 0) nid = EC_curve_nist2nid(ecparam_config.curve_name); if (nid == 0) { BIO_printf(bio_err, "unknown curve name (%s)\n", ecparam_config.curve_name); goto end; } group = EC_GROUP_new_by_curve_name(nid); if (group == NULL) { BIO_printf(bio_err, "unable to create curve (%s)\n", ecparam_config.curve_name); goto end; } EC_GROUP_set_asn1_flag(group, ecparam_config.asn1_flag); EC_GROUP_set_point_conversion_form(group, ecparam_config.form); } else if (ecparam_config.informat == FORMAT_ASN1) { group = d2i_ECPKParameters_bio(in, NULL); } else if (ecparam_config.informat == FORMAT_PEM) { group = PEM_read_bio_ECPKParameters(in, NULL, NULL, NULL); } else { BIO_printf(bio_err, "bad input format specified\n"); goto end; } if (group == NULL) { BIO_printf(bio_err, "unable to load elliptic curve parameters\n"); ERR_print_errors(bio_err); goto end; } if (ecparam_config.new_form) EC_GROUP_set_point_conversion_form(group, ecparam_config.form); if (ecparam_config.new_asn1_flag) EC_GROUP_set_asn1_flag(group, ecparam_config.asn1_flag); if (ecparam_config.no_seed) EC_GROUP_set_seed(group, NULL, 0); if (ecparam_config.text) { if (!ECPKParameters_print(out, group, 0)) goto end; } if (ecparam_config.check) { BIO_printf(bio_err, "checking elliptic curve parameters: "); if (!EC_GROUP_check(group, NULL)) { BIO_printf(bio_err, "failed\n"); ERR_print_errors(bio_err); } else BIO_printf(bio_err, "ok\n"); } if (ecparam_config.C) { size_t buf_len = 0, tmp_len = 0; const EC_POINT *point; int is_prime, len = 0; const EC_METHOD *meth = EC_GROUP_method_of(group); if ((ec_p = BN_new()) == NULL || (ec_a = BN_new()) == NULL || (ec_b = BN_new()) == NULL || (ec_gen = BN_new()) == NULL || (ec_order = BN_new()) == NULL || (ec_cofactor = BN_new()) == NULL) { perror("malloc"); goto end; } is_prime = (EC_METHOD_get_field_type(meth) == NID_X9_62_prime_field); if (is_prime) { if (!EC_GROUP_get_curve_GFp(group, ec_p, ec_a, ec_b, NULL)) goto end; } else { if (!EC_GROUP_get_curve_GF2m(group, ec_p, ec_a, ec_b, NULL)) goto end; } if ((point = EC_GROUP_get0_generator(group)) == NULL) goto end; if (!EC_POINT_point2bn(group, point, EC_GROUP_get_point_conversion_form(group), ec_gen, NULL)) goto end; if (!EC_GROUP_get_order(group, ec_order, NULL)) goto end; if (!EC_GROUP_get_cofactor(group, ec_cofactor, NULL)) goto end; len = BN_num_bits(ec_order); if ((tmp_len = (size_t) BN_num_bytes(ec_p)) > buf_len) buf_len = tmp_len; if ((tmp_len = (size_t) BN_num_bytes(ec_a)) > buf_len) buf_len = tmp_len; if ((tmp_len = (size_t) BN_num_bytes(ec_b)) > buf_len) buf_len = tmp_len; if ((tmp_len = (size_t) BN_num_bytes(ec_gen)) > buf_len) buf_len = tmp_len; if ((tmp_len = (size_t) BN_num_bytes(ec_order)) > buf_len) buf_len = tmp_len; if ((tmp_len = (size_t) BN_num_bytes(ec_cofactor)) > buf_len) buf_len = tmp_len; buffer = malloc(buf_len); if (buffer == NULL) { perror("malloc"); goto end; } ecparam_print_var(out, ec_p, "ec_p", len, buffer); ecparam_print_var(out, ec_a, "ec_a", len, buffer); ecparam_print_var(out, ec_b, "ec_b", len, buffer); ecparam_print_var(out, ec_gen, "ec_gen", len, buffer); ecparam_print_var(out, ec_order, "ec_order", len, buffer); ecparam_print_var(out, ec_cofactor, "ec_cofactor", len, buffer); BIO_printf(out, "\n\n"); BIO_printf(out, "EC_GROUP *get_ec_group_%d(void)\n\t{\n", len); BIO_printf(out, "\tint ok=0;\n"); BIO_printf(out, "\tEC_GROUP *group = NULL;\n"); BIO_printf(out, "\tEC_POINT *point = NULL;\n"); BIO_printf(out, "\tBIGNUM *tmp_1 = NULL, *tmp_2 = NULL, " "*tmp_3 = NULL;\n\n"); BIO_printf(out, "\tif ((tmp_1 = BN_bin2bn(ec_p_%d, " "sizeof(ec_p_%d), NULL)) == NULL)\n\t\t" "goto err;\n", len, len); BIO_printf(out, "\tif ((tmp_2 = BN_bin2bn(ec_a_%d, " "sizeof(ec_a_%d), NULL)) == NULL)\n\t\t" "goto err;\n", len, len); BIO_printf(out, "\tif ((tmp_3 = BN_bin2bn(ec_b_%d, " "sizeof(ec_b_%d), NULL)) == NULL)\n\t\t" "goto err;\n", len, len); if (is_prime) { BIO_printf(out, "\tif ((group = EC_GROUP_new_curve_" "GFp(tmp_1, tmp_2, tmp_3, NULL)) == NULL)" "\n\t\tgoto err;\n\n"); } else { BIO_printf(out, "\tif ((group = EC_GROUP_new_curve_" "GF2m(tmp_1, tmp_2, tmp_3, NULL)) == NULL)" "\n\t\tgoto err;\n\n"); } BIO_printf(out, "\t/* build generator */\n"); BIO_printf(out, "\tif ((tmp_1 = BN_bin2bn(ec_gen_%d, " "sizeof(ec_gen_%d), tmp_1)) == NULL)" "\n\t\tgoto err;\n", len, len); BIO_printf(out, "\tpoint = EC_POINT_bn2point(group, tmp_1, " "NULL, NULL);\n"); BIO_printf(out, "\tif (point == NULL)\n\t\tgoto err;\n"); BIO_printf(out, "\tif ((tmp_2 = BN_bin2bn(ec_order_%d, " "sizeof(ec_order_%d), tmp_2)) == NULL)" "\n\t\tgoto err;\n", len, len); BIO_printf(out, "\tif ((tmp_3 = BN_bin2bn(ec_cofactor_%d, " "sizeof(ec_cofactor_%d), tmp_3)) == NULL)" "\n\t\tgoto err;\n", len, len); BIO_printf(out, "\tif (!EC_GROUP_set_generator(group, point," " tmp_2, tmp_3))\n\t\tgoto err;\n"); BIO_printf(out, "\n\tok=1;\n"); BIO_printf(out, "err:\n"); BIO_printf(out, "\tif (tmp_1)\n\t\tBN_free(tmp_1);\n"); BIO_printf(out, "\tif (tmp_2)\n\t\tBN_free(tmp_2);\n"); BIO_printf(out, "\tif (tmp_3)\n\t\tBN_free(tmp_3);\n"); BIO_printf(out, "\tif (point)\n\t\tEC_POINT_free(point);\n"); BIO_printf(out, "\tif (!ok)\n"); BIO_printf(out, "\t\t{\n"); BIO_printf(out, "\t\tEC_GROUP_free(group);\n"); BIO_printf(out, "\t\tgroup = NULL;\n"); BIO_printf(out, "\t\t}\n"); BIO_printf(out, "\treturn(group);\n\t}\n"); } if (!ecparam_config.noout) { if (ecparam_config.outformat == FORMAT_ASN1) i = i2d_ECPKParameters_bio(out, group); else if (ecparam_config.outformat == FORMAT_PEM) i = PEM_write_bio_ECPKParameters(out, group); else { BIO_printf(bio_err, "bad output format specified for" " outfile\n"); goto end; } if (!i) { BIO_printf(bio_err, "unable to write elliptic " "curve parameters\n"); ERR_print_errors(bio_err); goto end; } } if (ecparam_config.genkey) { EC_KEY *eckey = EC_KEY_new(); if (eckey == NULL) goto end; if (EC_KEY_set_group(eckey, group) == 0) { EC_KEY_free(eckey); goto end; } if (!EC_KEY_generate_key(eckey)) { EC_KEY_free(eckey); goto end; } if (ecparam_config.outformat == FORMAT_ASN1) i = i2d_ECPrivateKey_bio(out, eckey); else if (ecparam_config.outformat == FORMAT_PEM) i = PEM_write_bio_ECPrivateKey(out, eckey, NULL, NULL, 0, NULL, NULL); else { BIO_printf(bio_err, "bad output format specified " "for outfile\n"); EC_KEY_free(eckey); goto end; } EC_KEY_free(eckey); } ret = 0; end: BN_free(ec_p); BN_free(ec_a); BN_free(ec_b); BN_free(ec_gen); BN_free(ec_order); BN_free(ec_cofactor); free(buffer); BIO_free(in); BIO_free_all(out); EC_GROUP_free(group); return (ret); } static int ecparam_print_var(BIO * out, BIGNUM * in, const char *var, int len, unsigned char *buffer) { BIO_printf(out, "static unsigned char %s_%d[] = {", var, len); if (BN_is_zero(in)) BIO_printf(out, "\n\t0x00"); else { int i, l; l = BN_bn2bin(in, buffer); for (i = 0; i < l - 1; i++) { if ((i % 12) == 0) BIO_printf(out, "\n\t"); BIO_printf(out, "0x%02X,", buffer[i]); } if ((i % 12) == 0) BIO_printf(out, "\n\t"); BIO_printf(out, "0x%02X", buffer[i]); } BIO_printf(out, "\n\t};\n\n"); return 1; } #endif