/* $OpenBSD: ecparam.c,v 1.20 2014/06/12 15:49:27 deraadt 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 #ifndef OPENSSL_NO_EC #include #include #include #include #include "apps.h" #include #include #include #include #include #include /* -inform arg - input format - default PEM (DER or PEM) * -outform arg - output format - default PEM * -in arg - input file - default stdin * -out arg - output file - default stdout * -noout - do not print the ec parameter * -text - print the ec parameters in text form * -check - validate the ec parameters * -C - print a 'C' function creating the parameters * -name arg - use the ec parameters with 'short name' name * -list_curves - prints a list of all currently available curve 'short names' * -conv_form arg - specifies the point conversion form * - possible values: compressed * uncompressed (default) * hybrid * -param_enc arg - specifies the way the ec parameters are encoded * in the asn1 der encoding * possible values: named_curve (default) * explicit * -no_seed - if 'explicit' parameters are chosen do not use the seed * -genkey - generate ec key * -engine e - use engine e, possibly a hardware device */ static int ecparam_print_var(BIO *, BIGNUM *, const char *, int, unsigned char *); int ecparam_main(int, char **); int ecparam_main(int argc, char **argv) { EC_GROUP *group = NULL; point_conversion_form_t form = POINT_CONVERSION_UNCOMPRESSED; int new_form = 0; int asn1_flag = OPENSSL_EC_NAMED_CURVE; int new_asn1_flag = 0; char *curve_name = NULL; int list_curves = 0, no_seed = 0, check = 0, badops = 0, text = 0, i, genkey = 0; char *infile = NULL, *outfile = NULL, *prog; BIO *in = NULL, *out = NULL; int informat, outformat, noout = 0, C = 0, ret = 1; char *engine = NULL; BIGNUM *ec_p = NULL, *ec_a = NULL, *ec_b = NULL, *ec_gen = NULL, *ec_order = NULL, *ec_cofactor = NULL; unsigned char *buffer = NULL; if (!load_config(bio_err, NULL)) goto end; informat = FORMAT_PEM; outformat = FORMAT_PEM; prog = argv[0]; argc--; argv++; while (argc >= 1) { if (strcmp(*argv, "-inform") == 0) { if (--argc < 1) goto bad; informat = str2fmt(*(++argv)); } else if (strcmp(*argv, "-outform") == 0) { if (--argc < 1) goto bad; outformat = str2fmt(*(++argv)); } else if (strcmp(*argv, "-in") == 0) { if (--argc < 1) goto bad; infile = *(++argv); } else if (strcmp(*argv, "-out") == 0) { if (--argc < 1) goto bad; outfile = *(++argv); } else if (strcmp(*argv, "-text") == 0) text = 1; else if (strcmp(*argv, "-C") == 0) C = 1; else if (strcmp(*argv, "-check") == 0) check = 1; else if (strcmp(*argv, "-name") == 0) { if (--argc < 1) goto bad; curve_name = *(++argv); } else if (strcmp(*argv, "-list_curves") == 0) list_curves = 1; else if (strcmp(*argv, "-conv_form") == 0) { if (--argc < 1) goto bad; ++argv; new_form = 1; if (strcmp(*argv, "compressed") == 0) form = POINT_CONVERSION_COMPRESSED; else if (strcmp(*argv, "uncompressed") == 0) form = POINT_CONVERSION_UNCOMPRESSED; else if (strcmp(*argv, "hybrid") == 0) form = POINT_CONVERSION_HYBRID; else goto bad; } else if (strcmp(*argv, "-param_enc") == 0) { if (--argc < 1) goto bad; ++argv; new_asn1_flag = 1; if (strcmp(*argv, "named_curve") == 0) asn1_flag = OPENSSL_EC_NAMED_CURVE; else if (strcmp(*argv, "explicit") == 0) asn1_flag = 0; else goto bad; } else if (strcmp(*argv, "-no_seed") == 0) no_seed = 1; else if (strcmp(*argv, "-noout") == 0) noout = 1; else if (strcmp(*argv, "-genkey") == 0) { genkey = 1; } else if (strcmp(*argv, "-engine") == 0) { if (--argc < 1) goto bad; engine = *(++argv); } else { BIO_printf(bio_err, "unknown option %s\n", *argv); badops = 1; break; } argc--; argv++; } if (badops) { bad: BIO_printf(bio_err, "%s [options] outfile\n", prog); BIO_printf(bio_err, "where options are\n"); BIO_printf(bio_err, " -inform arg input format - " "default PEM (DER or PEM)\n"); BIO_printf(bio_err, " -outform arg output format - " "default PEM\n"); BIO_printf(bio_err, " -in arg input file - " "default stdin\n"); BIO_printf(bio_err, " -out arg output file - " "default stdout\n"); BIO_printf(bio_err, " -noout do not print the " "ec parameter\n"); BIO_printf(bio_err, " -text print the ec " "parameters in text form\n"); BIO_printf(bio_err, " -check validate the ec " "parameters\n"); BIO_printf(bio_err, " -C print a 'C' " "function creating the parameters\n"); BIO_printf(bio_err, " -name arg use the " "ec parameters with 'short name' name\n"); BIO_printf(bio_err, " -list_curves prints a list of " "all currently available curve 'short names'\n"); BIO_printf(bio_err, " -conv_form arg specifies the " "point conversion form \n"); BIO_printf(bio_err, " possible values:" " compressed\n"); BIO_printf(bio_err, " " " uncompressed (default)\n"); BIO_printf(bio_err, " " " hybrid\n"); BIO_printf(bio_err, " -param_enc arg specifies the way" " the ec parameters are encoded\n"); BIO_printf(bio_err, " in the asn1 der " "encoding\n"); BIO_printf(bio_err, " possible values:" " named_curve (default)\n"); BIO_printf(bio_err, " " " explicit\n"); BIO_printf(bio_err, " -no_seed if 'explicit'" " parameters are chosen do not" " use the seed\n"); BIO_printf(bio_err, " -genkey generate ec" " key\n"); BIO_printf(bio_err, " -engine e use engine e, " "possibly a hardware device\n"); goto end; } ERR_load_crypto_strings(); 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 (infile == NULL) BIO_set_fp(in, stdin, BIO_NOCLOSE); else { if (BIO_read_filename(in, infile) <= 0) { perror(infile); goto end; } } if (outfile == NULL) { BIO_set_fp(out, stdout, BIO_NOCLOSE); } else { if (BIO_write_filename(out, outfile) <= 0) { perror(outfile); goto end; } } #ifndef OPENSSL_NO_ENGINE setup_engine(bio_err, engine, 0); #endif if (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 (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(curve_name, "secp192r1")) { BIO_printf(bio_err, "using curve name prime192v1 " "instead of secp192r1\n"); nid = NID_X9_62_prime192v1; } else if (!strcmp(curve_name, "secp256r1")) { BIO_printf(bio_err, "using curve name prime256v1 " "instead of secp256r1\n"); nid = NID_X9_62_prime256v1; } else nid = OBJ_sn2nid(curve_name); if (nid == 0) { BIO_printf(bio_err, "unknown curve name (%s)\n", 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", curve_name); goto end; } EC_GROUP_set_asn1_flag(group, asn1_flag); EC_GROUP_set_point_conversion_form(group, form); } else if (informat == FORMAT_ASN1) { group = d2i_ECPKParameters_bio(in, NULL); } else if (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 (new_form) EC_GROUP_set_point_conversion_form(group, form); if (new_asn1_flag) EC_GROUP_set_asn1_flag(group, asn1_flag); if (no_seed) { EC_GROUP_set_seed(group, NULL, 0); } if (text) { if (!ECPKParameters_print(out, group, 0)) goto end; } if (check) { if (group == NULL) BIO_printf(bio_err, "no elliptic curve parameters\n"); 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 (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 { /* TODO */ 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; if (!ec_p || !ec_a || !ec_b || !ec_gen || !ec_order || !ec_cofactor) 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 { /* TODO */ goto end; } 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 (!noout) { if (outformat == FORMAT_ASN1) i = i2d_ECPKParameters_bio(out, group); else if (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 (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 (outformat == FORMAT_ASN1) i = i2d_ECPrivateKey_bio(out, eckey); else if (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: if (ec_p) BN_free(ec_p); if (ec_a) BN_free(ec_a); if (ec_b) BN_free(ec_b); if (ec_gen) BN_free(ec_gen); if (ec_order) BN_free(ec_order); if (ec_cofactor) BN_free(ec_cofactor); free(buffer); if (in != NULL) BIO_free(in); if (out != NULL) BIO_free_all(out); if (group != NULL) 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