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openssl_setup() calls SSL_load_error_strings(), which happens to call
ERR_load_crypto_strings() - as such, we do not need to call the same
function from most of the applications.

/* $OpenBSD: rsa.c,v 1.2 2014/08/28 14:23:52 jsing Exp $ */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 *
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 *
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 *
 * 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 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 acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 *
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS 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 AUTHOR OR 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.
 *
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#include <openssl/opensslconf.h>


#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/err.h>
#include <openssl/evp.h>
#include <openssl/pem.h>
#include <openssl/rsa.h>
#include <openssl/x509.h>

/* -inform arg	- input format - default PEM (one of DER, NET or PEM)
 * -outform arg - output format - default PEM
 * -in arg	- input file - default stdin
 * -out arg	- output file - default stdout
 * -des		- encrypt output if PEM format with DES in cbc mode
 * -des3	- encrypt output if PEM format
 * -idea	- encrypt output if PEM format
 * -seed	- encrypt output if PEM format
 * -aes128	- encrypt output if PEM format
 * -aes192	- encrypt output if PEM format
 * -aes256	- encrypt output if PEM format
 * -camellia128 - encrypt output if PEM format
 * -camellia192 - encrypt output if PEM format
 * -camellia256 - encrypt output if PEM format
 * -text	- print a text version
 * -modulus	- print the RSA key modulus
 * -check	- verify key consistency
 * -pubin	- Expect a public key in input file.
 * -pubout	- Output a public key.
 */

int rsa_main(int, char **);

int
rsa_main(int argc, char **argv)
{
	ENGINE *e = NULL;
	int ret = 1;
	RSA *rsa = NULL;
	int i, badops = 0, sgckey = 0;
	const EVP_CIPHER *enc = NULL;
	BIO *out = NULL;
	int informat, outformat, text = 0, check = 0, noout = 0;
	int pubin = 0, pubout = 0;
	char *infile, *outfile, *prog;
	char *passargin = NULL, *passargout = NULL;
	char *passin = NULL, *passout = NULL;
#ifndef OPENSSL_NO_ENGINE
	char *engine = NULL;
#endif
	int modulus = 0;

	int pvk_encr = 2;

	infile = NULL;
	outfile = NULL;
	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, "-passin") == 0) {
			if (--argc < 1)
				goto bad;
			passargin = *(++argv);
		} else if (strcmp(*argv, "-passout") == 0) {
			if (--argc < 1)
				goto bad;
			passargout = *(++argv);
		}
#ifndef OPENSSL_NO_ENGINE
		else if (strcmp(*argv, "-engine") == 0) {
			if (--argc < 1)
				goto bad;
			engine = *(++argv);
		}
#endif
		else if (strcmp(*argv, "-sgckey") == 0)
			sgckey = 1;
		else if (strcmp(*argv, "-pubin") == 0)
			pubin = 1;
		else if (strcmp(*argv, "-pubout") == 0)
			pubout = 1;
		else if (strcmp(*argv, "-RSAPublicKey_in") == 0)
			pubin = 2;
		else if (strcmp(*argv, "-RSAPublicKey_out") == 0)
			pubout = 2;
		else if (strcmp(*argv, "-pvk-strong") == 0)
			pvk_encr = 2;
		else if (strcmp(*argv, "-pvk-weak") == 0)
			pvk_encr = 1;
		else if (strcmp(*argv, "-pvk-none") == 0)
			pvk_encr = 0;
		else if (strcmp(*argv, "-noout") == 0)
			noout = 1;
		else if (strcmp(*argv, "-text") == 0)
			text = 1;
		else if (strcmp(*argv, "-modulus") == 0)
			modulus = 1;
		else if (strcmp(*argv, "-check") == 0)
			check = 1;
		else if ((enc = EVP_get_cipherbyname(&(argv[0][1]))) == NULL) {
			BIO_printf(bio_err, "unknown option %s\n", *argv);
			badops = 1;
			break;
		}
		argc--;
		argv++;
	}

	if (badops) {
bad:
		BIO_printf(bio_err, "%s [options] <infile >outfile\n", prog);
		BIO_printf(bio_err, "where options are\n");
		BIO_printf(bio_err, " -inform arg     input format - one of DER NET PEM\n");
		BIO_printf(bio_err, " -outform arg    output format - one of DER NET PEM\n");
		BIO_printf(bio_err, " -in arg         input file\n");
		BIO_printf(bio_err, " -sgckey         Use IIS SGC key format\n");
		BIO_printf(bio_err, " -passin arg     input file pass phrase source\n");
		BIO_printf(bio_err, " -out arg        output file\n");
		BIO_printf(bio_err, " -passout arg    output file pass phrase source\n");
		BIO_printf(bio_err, " -des            encrypt PEM output with cbc des\n");
		BIO_printf(bio_err, " -des3           encrypt PEM output with ede cbc des using 168 bit key\n");
#ifndef OPENSSL_NO_IDEA
		BIO_printf(bio_err, " -idea           encrypt PEM output with cbc idea\n");
#endif
#ifndef OPENSSL_NO_AES
		BIO_printf(bio_err, " -aes128, -aes192, -aes256\n");
		BIO_printf(bio_err, "                 encrypt PEM output with cbc aes\n");
#endif
#ifndef OPENSSL_NO_CAMELLIA
		BIO_printf(bio_err, " -camellia128, -camellia192, -camellia256\n");
		BIO_printf(bio_err, "                 encrypt PEM output with cbc camellia\n");
#endif
		BIO_printf(bio_err, " -text           print the key in text\n");
		BIO_printf(bio_err, " -noout          don't print key out\n");
		BIO_printf(bio_err, " -modulus        print the RSA key modulus\n");
		BIO_printf(bio_err, " -check          verify key consistency\n");
		BIO_printf(bio_err, " -pubin          expect a public key in input file\n");
		BIO_printf(bio_err, " -pubout         output a public key\n");
#ifndef OPENSSL_NO_ENGINE
		BIO_printf(bio_err, " -engine e       use engine e, possibly a hardware device.\n");
#endif
		goto end;
	}

#ifndef OPENSSL_NO_ENGINE
	e = setup_engine(bio_err, engine, 0);
#endif

	if (!app_passwd(bio_err, passargin, passargout, &passin, &passout)) {
		BIO_printf(bio_err, "Error getting passwords\n");
		goto end;
	}
	if (check && pubin) {
		BIO_printf(bio_err, "Only private keys can be checked\n");
		goto end;
	}
	out = BIO_new(BIO_s_file());

	{
		EVP_PKEY *pkey;

		if (pubin) {
			int tmpformat = -1;
			if (pubin == 2) {
				if (informat == FORMAT_PEM)
					tmpformat = FORMAT_PEMRSA;
				else if (informat == FORMAT_ASN1)
					tmpformat = FORMAT_ASN1RSA;
			} else if (informat == FORMAT_NETSCAPE && sgckey)
				tmpformat = FORMAT_IISSGC;
			else
				tmpformat = informat;

			pkey = load_pubkey(bio_err, infile, tmpformat, 1,
			    passin, e, "Public Key");
		} else
			pkey = load_key(bio_err, infile,
			    (informat == FORMAT_NETSCAPE && sgckey ?
				FORMAT_IISSGC : informat), 1,
			    passin, e, "Private Key");

		if (pkey != NULL)
			rsa = EVP_PKEY_get1_RSA(pkey);
		EVP_PKEY_free(pkey);
	}

	if (rsa == NULL) {
		ERR_print_errors(bio_err);
		goto end;
	}
	if (outfile == NULL) {
		BIO_set_fp(out, stdout, BIO_NOCLOSE);
	} else {
		if (BIO_write_filename(out, outfile) <= 0) {
			perror(outfile);
			goto end;
		}
	}

	if (text)
		if (!RSA_print(out, rsa, 0)) {
			perror(outfile);
			ERR_print_errors(bio_err);
			goto end;
		}
	if (modulus) {
		BIO_printf(out, "Modulus=");
		BN_print(out, rsa->n);
		BIO_printf(out, "\n");
	}
	if (check) {
		int r = RSA_check_key(rsa);

		if (r == 1)
			BIO_printf(out, "RSA key ok\n");
		else if (r == 0) {
			unsigned long err;

			while ((err = ERR_peek_error()) != 0 &&
			    ERR_GET_LIB(err) == ERR_LIB_RSA &&
			    ERR_GET_FUNC(err) == RSA_F_RSA_CHECK_KEY &&
			    ERR_GET_REASON(err) != ERR_R_MALLOC_FAILURE) {
				BIO_printf(out, "RSA key error: %s\n", ERR_reason_error_string(err));
				ERR_get_error();	/* remove e from error
							 * stack */
			}
		}
		if (r == -1 || ERR_peek_error() != 0) {	/* should happen only if
							 * r == -1 */
			ERR_print_errors(bio_err);
			goto end;
		}
	}
	if (noout) {
		ret = 0;
		goto end;
	}
	BIO_printf(bio_err, "writing RSA key\n");
	if (outformat == FORMAT_ASN1) {
		if (pubout || pubin) {
			if (pubout == 2)
				i = i2d_RSAPublicKey_bio(out, rsa);
			else
				i = i2d_RSA_PUBKEY_bio(out, rsa);
		} else
			i = i2d_RSAPrivateKey_bio(out, rsa);
	}
#ifndef OPENSSL_NO_RC4
	else if (outformat == FORMAT_NETSCAPE) {
		unsigned char *p, *pp;
		int size;

		i = 1;
		size = i2d_RSA_NET(rsa, NULL, NULL, sgckey);
		if ((p = malloc(size)) == NULL) {
			BIO_printf(bio_err, "Memory allocation failure\n");
			goto end;
		}
		pp = p;
		i2d_RSA_NET(rsa, &p, NULL, sgckey);
		BIO_write(out, (char *) pp, size);
		free(pp);
	}
#endif
	else if (outformat == FORMAT_PEM) {
		if (pubout || pubin) {
			if (pubout == 2)
				i = PEM_write_bio_RSAPublicKey(out, rsa);
			else
				i = PEM_write_bio_RSA_PUBKEY(out, rsa);
		} else
			i = PEM_write_bio_RSAPrivateKey(out, rsa,
			    enc, NULL, 0, NULL, passout);
#if !defined(OPENSSL_NO_DSA) && !defined(OPENSSL_NO_RC4)
	} else if (outformat == FORMAT_MSBLOB || outformat == FORMAT_PVK) {
		EVP_PKEY *pk;
		pk = EVP_PKEY_new();
		EVP_PKEY_set1_RSA(pk, rsa);
		if (outformat == FORMAT_PVK)
			i = i2b_PVK_bio(out, pk, pvk_encr, 0, passout);
		else if (pubin || pubout)
			i = i2b_PublicKey_bio(out, pk);
		else
			i = i2b_PrivateKey_bio(out, pk);
		EVP_PKEY_free(pk);
#endif
	} else {
		BIO_printf(bio_err, "bad output format specified for outfile\n");
		goto end;
	}
	if (i <= 0) {
		BIO_printf(bio_err, "unable to write key\n");
		ERR_print_errors(bio_err);
	} else
		ret = 0;
end:
	if (out != NULL)
		BIO_free_all(out);
	if (rsa != NULL)
		RSA_free(rsa);
	free(passin);
	free(passout);

	return (ret);
}