/* * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved. * * Licensed under the OpenSSL license (the "License"). You may not use * this file except in compliance with the License. You can obtain a copy * in the file LICENSE in the source distribution or at * https://www.openssl.org/source/license.html */ #include #include #include #include #include #include "apps.h" #include "progs.h" #include #include #include #include #include #include static int dsa_cb(int p, int n, BN_GENCB *cb); typedef enum OPTION_choice { OPT_ERR = -1, OPT_EOF = 0, OPT_HELP, OPT_INFORM, OPT_OUTFORM, OPT_IN, OPT_OUT, OPT_TEXT, OPT_C, OPT_NOOUT, OPT_GENKEY, OPT_ENGINE, OPT_R_ENUM } OPTION_CHOICE; const OPTIONS dsaparam_options[] = { {"help", OPT_HELP, '-', "Display this summary"}, {"inform", OPT_INFORM, 'F', "Input format - DER or PEM"}, {"in", OPT_IN, '<', "Input file"}, {"outform", OPT_OUTFORM, 'F', "Output format - DER or PEM"}, {"out", OPT_OUT, '>', "Output file"}, {"text", OPT_TEXT, '-', "Print as text"}, {"C", OPT_C, '-', "Output C code"}, {"noout", OPT_NOOUT, '-', "No output"}, {"genkey", OPT_GENKEY, '-', "Generate a DSA key"}, OPT_R_OPTIONS, #ifndef OPENSSL_NO_ENGINE {"engine", OPT_ENGINE, 's', "Use engine e, possibly a hardware device"}, #endif {NULL} }; int dsaparam_main(int argc, char **argv) { ENGINE *e = NULL; DSA *dsa = NULL; BIO *in = NULL, *out = NULL; BN_GENCB *cb = NULL; int numbits = -1, num = 0, genkey = 0; int informat = FORMAT_PEM, outformat = FORMAT_PEM, noout = 0, C = 0; int ret = 1, i, text = 0, private = 0; char *infile = NULL, *outfile = NULL, *prog; OPTION_CHOICE o; prog = opt_init(argc, argv, dsaparam_options); while ((o = opt_next()) != OPT_EOF) { switch (o) { case OPT_EOF: case OPT_ERR: opthelp: BIO_printf(bio_err, "%s: Use -help for summary.\n", prog); goto end; case OPT_HELP: opt_help(dsaparam_options); ret = 0; goto end; case OPT_INFORM: if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &informat)) goto opthelp; break; case OPT_IN: infile = opt_arg(); break; case OPT_OUTFORM: if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &outformat)) goto opthelp; break; case OPT_OUT: outfile = opt_arg(); break; case OPT_ENGINE: e = setup_engine(opt_arg(), 0); break; case OPT_TEXT: text = 1; break; case OPT_C: C = 1; break; case OPT_GENKEY: genkey = 1; break; case OPT_R_CASES: if (!opt_rand(o)) goto end; break; case OPT_NOOUT: noout = 1; break; } } argc = opt_num_rest(); argv = opt_rest(); if (argc == 1) { if (!opt_int(argv[0], &num) || num < 0) goto end; /* generate a key */ numbits = num; } private = genkey ? 1 : 0; in = bio_open_default(infile, 'r', informat); if (in == NULL) goto end; out = bio_open_owner(outfile, outformat, private); if (out == NULL) goto end; if (numbits > 0) { if (numbits > OPENSSL_DSA_MAX_MODULUS_BITS) BIO_printf(bio_err, "Warning: It is not recommended to use more than %d bit for DSA keys.\n" " Your key size is %d! Larger key size may behave not as expected.\n", OPENSSL_DSA_MAX_MODULUS_BITS, numbits); cb = BN_GENCB_new(); if (cb == NULL) { BIO_printf(bio_err, "Error allocating BN_GENCB object\n"); goto end; } BN_GENCB_set(cb, dsa_cb, bio_err); dsa = DSA_new(); if (dsa == NULL) { BIO_printf(bio_err, "Error allocating DSA object\n"); goto end; } BIO_printf(bio_err, "Generating DSA parameters, %d bit long prime\n", num); BIO_printf(bio_err, "This could take some time\n"); if (!DSA_generate_parameters_ex(dsa, num, NULL, 0, NULL, NULL, cb)) { ERR_print_errors(bio_err); BIO_printf(bio_err, "Error, DSA key generation failed\n"); goto end; } } else if (informat == FORMAT_ASN1) { dsa = d2i_DSAparams_bio(in, NULL); } else { dsa = PEM_read_bio_DSAparams(in, NULL, NULL, NULL); } if (dsa == NULL) { BIO_printf(bio_err, "unable to load DSA parameters\n"); ERR_print_errors(bio_err); goto end; } if (text) { DSAparams_print(out, dsa); } if (C) { const BIGNUM *p = NULL, *q = NULL, *g = NULL; unsigned char *data; int len, bits_p; DSA_get0_pqg(dsa, &p, &q, &g); len = BN_num_bytes(p); bits_p = BN_num_bits(p); data = app_malloc(len + 20, "BN space"); BIO_printf(bio_out, "static DSA *get_dsa%d(void)\n{\n", bits_p); print_bignum_var(bio_out, p, "dsap", bits_p, data); print_bignum_var(bio_out, q, "dsaq", bits_p, data); print_bignum_var(bio_out, g, "dsag", bits_p, data); BIO_printf(bio_out, " DSA *dsa = DSA_new();\n" " BIGNUM *p, *q, *g;\n" "\n"); BIO_printf(bio_out, " if (dsa == NULL)\n" " return NULL;\n"); BIO_printf(bio_out, " if (!DSA_set0_pqg(dsa, p = BN_bin2bn(dsap_%d, sizeof(dsap_%d), NULL),\n", bits_p, bits_p); BIO_printf(bio_out, " q = BN_bin2bn(dsaq_%d, sizeof(dsaq_%d), NULL),\n", bits_p, bits_p); BIO_printf(bio_out, " g = BN_bin2bn(dsag_%d, sizeof(dsag_%d), NULL))) {\n", bits_p, bits_p); BIO_printf(bio_out, " DSA_free(dsa);\n" " BN_free(p);\n" " BN_free(q);\n" " BN_free(g);\n" " return NULL;\n" " }\n" " return dsa;\n}\n"); OPENSSL_free(data); } if (outformat == FORMAT_ASN1 && genkey) noout = 1; if (!noout) { if (outformat == FORMAT_ASN1) i = i2d_DSAparams_bio(out, dsa); else i = PEM_write_bio_DSAparams(out, dsa); if (!i) { BIO_printf(bio_err, "unable to write DSA parameters\n"); ERR_print_errors(bio_err); goto end; } } if (genkey) { DSA *dsakey; if ((dsakey = DSAparams_dup(dsa)) == NULL) goto end; if (!DSA_generate_key(dsakey)) { ERR_print_errors(bio_err); DSA_free(dsakey); goto end; } assert(private); if (outformat == FORMAT_ASN1) i = i2d_DSAPrivateKey_bio(out, dsakey); else i = PEM_write_bio_DSAPrivateKey(out, dsakey, NULL, NULL, 0, NULL, NULL); DSA_free(dsakey); } ret = 0; end: BN_GENCB_free(cb); BIO_free(in); BIO_free_all(out); DSA_free(dsa); release_engine(e); return ret; } static int dsa_cb(int p, int n, BN_GENCB *cb) { static const char symbols[] = ".+*\n"; char c = (p >= 0 && (size_t)p < sizeof(symbols) - 1) ? symbols[p] : '?'; BIO_write(BN_GENCB_get_arg(cb), &c, 1); (void)BIO_flush(BN_GENCB_get_arg(cb)); return 1; }