xref: /openbsd-src/lib/libcrypto/pem/pem_pk8.c (revision 4a925a6a8d19d7b7ed705f131daa4c3c08f0db82)

/* $OpenBSD: pem_pk8.c,v 1.14 2023/07/07 13:40:44 beck 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 <stdio.h>
#include <string.h>

#include <openssl/buffer.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/objects.h>
#include <openssl/pem.h>
#include <openssl/pkcs12.h>
#include <openssl/x509.h>

static int do_pk8pkey(BIO *bp, EVP_PKEY *x, int isder, int nid,
    const EVP_CIPHER *enc, char *kstr, int klen, pem_password_cb *cb, void *u);
static int do_pk8pkey_fp(FILE *bp, EVP_PKEY *x, int isder, int nid,
    const EVP_CIPHER *enc, char *kstr, int klen, pem_password_cb *cb, void *u);

/* These functions write a private key in PKCS#8 format: it is a "drop in"
 * replacement for PEM_write_bio_PrivateKey() and friends. As usual if 'enc'
 * is NULL then it uses the unencrypted private key form. The 'nid' versions
 * uses PKCS#5 v1.5 PBE algorithms whereas the others use PKCS#5 v2.0.
 */

int
PEM_write_bio_PKCS8PrivateKey_nid(BIO *bp, EVP_PKEY *x, int nid, char *kstr,
    int klen, pem_password_cb *cb, void *u)
{
	return do_pk8pkey(bp, x, 0, nid, NULL, kstr, klen, cb, u);
}
LCRYPTO_ALIAS(PEM_write_bio_PKCS8PrivateKey_nid);

int
PEM_write_bio_PKCS8PrivateKey(BIO *bp, EVP_PKEY *x, const EVP_CIPHER *enc,
    char *kstr, int klen, pem_password_cb *cb, void *u)
{
	return do_pk8pkey(bp, x, 0, -1, enc, kstr, klen, cb, u);
}
LCRYPTO_ALIAS(PEM_write_bio_PKCS8PrivateKey);

int
i2d_PKCS8PrivateKey_bio(BIO *bp, EVP_PKEY *x, const EVP_CIPHER *enc,
    char *kstr, int klen, pem_password_cb *cb, void *u)
{
	return do_pk8pkey(bp, x, 1, -1, enc, kstr, klen, cb, u);
}
LCRYPTO_ALIAS(i2d_PKCS8PrivateKey_bio);

int
i2d_PKCS8PrivateKey_nid_bio(BIO *bp, EVP_PKEY *x, int nid,
    char *kstr, int klen, pem_password_cb *cb, void *u)
{
	return do_pk8pkey(bp, x, 1, nid, NULL, kstr, klen, cb, u);
}
LCRYPTO_ALIAS(i2d_PKCS8PrivateKey_nid_bio);

static int
do_pk8pkey(BIO *bp, EVP_PKEY *x, int isder, int nid, const EVP_CIPHER *enc,
    char *kstr, int klen, pem_password_cb *cb, void *u)
{
	X509_SIG *p8;
	PKCS8_PRIV_KEY_INFO *p8inf;
	char buf[PEM_BUFSIZE];
	int ret;

	if (!(p8inf = EVP_PKEY2PKCS8(x))) {
		PEMerror(PEM_R_ERROR_CONVERTING_PRIVATE_KEY);
		return 0;
	}
	if (enc || (nid != -1)) {
		if (!kstr) {
			if (!cb)
				klen = PEM_def_callback(buf, PEM_BUFSIZE, 1, u);
			else
				klen = cb(buf, PEM_BUFSIZE, 1, u);
			if (klen <= 0) {
				PEMerror(PEM_R_READ_KEY);
				PKCS8_PRIV_KEY_INFO_free(p8inf);
				return 0;
			}

			kstr = buf;
		}
		p8 = PKCS8_encrypt(nid, enc, kstr, klen, NULL, 0, 0, p8inf);
		if (kstr == buf)
			explicit_bzero(buf, klen);
		PKCS8_PRIV_KEY_INFO_free(p8inf);
		if (isder)
			ret = i2d_PKCS8_bio(bp, p8);
		else
			ret = PEM_write_bio_PKCS8(bp, p8);
		X509_SIG_free(p8);
		return ret;
	} else {
		if (isder)
			ret = i2d_PKCS8_PRIV_KEY_INFO_bio(bp, p8inf);
		else
			ret = PEM_write_bio_PKCS8_PRIV_KEY_INFO(bp, p8inf);
		PKCS8_PRIV_KEY_INFO_free(p8inf);
		return ret;
	}
}

EVP_PKEY *
d2i_PKCS8PrivateKey_bio(BIO *bp, EVP_PKEY **x, pem_password_cb *cb, void *u)
{
	PKCS8_PRIV_KEY_INFO *p8inf = NULL;
	X509_SIG *p8 = NULL;
	int klen;
	EVP_PKEY *ret;
	char psbuf[PEM_BUFSIZE];

	p8 = d2i_PKCS8_bio(bp, NULL);
	if (!p8)
		return NULL;
	if (cb)
		klen = cb(psbuf, PEM_BUFSIZE, 0, u);
	else
		klen = PEM_def_callback(psbuf, PEM_BUFSIZE, 0, u);
	if (klen <= 0) {
		PEMerror(PEM_R_BAD_PASSWORD_READ);
		X509_SIG_free(p8);
		return NULL;
	}
	p8inf = PKCS8_decrypt(p8, psbuf, klen);
	X509_SIG_free(p8);
	if (!p8inf)
		return NULL;
	ret = EVP_PKCS82PKEY(p8inf);
	PKCS8_PRIV_KEY_INFO_free(p8inf);
	if (!ret)
		return NULL;
	if (x) {
		EVP_PKEY_free(*x);
		*x = ret;
	}
	return ret;
}
LCRYPTO_ALIAS(d2i_PKCS8PrivateKey_bio);


int
i2d_PKCS8PrivateKey_fp(FILE *fp, EVP_PKEY *x, const EVP_CIPHER *enc,
    char *kstr, int klen, pem_password_cb *cb, void *u)
{
	return do_pk8pkey_fp(fp, x, 1, -1, enc, kstr, klen, cb, u);
}
LCRYPTO_ALIAS(i2d_PKCS8PrivateKey_fp);

int
i2d_PKCS8PrivateKey_nid_fp(FILE *fp, EVP_PKEY *x, int nid, char *kstr,
    int klen, pem_password_cb *cb, void *u)
{
	return do_pk8pkey_fp(fp, x, 1, nid, NULL, kstr, klen, cb, u);
}
LCRYPTO_ALIAS(i2d_PKCS8PrivateKey_nid_fp);

int
PEM_write_PKCS8PrivateKey_nid(FILE *fp, EVP_PKEY *x, int nid, char *kstr,
    int klen, pem_password_cb *cb, void *u)
{
	return do_pk8pkey_fp(fp, x, 0, nid, NULL, kstr, klen, cb, u);
}
LCRYPTO_ALIAS(PEM_write_PKCS8PrivateKey_nid);

int
PEM_write_PKCS8PrivateKey(FILE *fp, EVP_PKEY *x, const EVP_CIPHER *enc,
    char *kstr, int klen, pem_password_cb *cb, void *u)
{
	return do_pk8pkey_fp(fp, x, 0, -1, enc, kstr, klen, cb, u);
}
LCRYPTO_ALIAS(PEM_write_PKCS8PrivateKey);

static int
do_pk8pkey_fp(FILE *fp, EVP_PKEY *x, int isder, int nid, const EVP_CIPHER *enc,
    char *kstr, int klen, pem_password_cb *cb, void *u)
{
	BIO *bp;
	int ret;

	if (!(bp = BIO_new_fp(fp, BIO_NOCLOSE))) {
		PEMerror(ERR_R_BUF_LIB);
		return (0);
	}
	ret = do_pk8pkey(bp, x, isder, nid, enc, kstr, klen, cb, u);
	BIO_free(bp);
	return ret;
}

EVP_PKEY *
d2i_PKCS8PrivateKey_fp(FILE *fp, EVP_PKEY **x, pem_password_cb *cb, void *u)
{
	BIO *bp;
	EVP_PKEY *ret;

	if (!(bp = BIO_new_fp(fp, BIO_NOCLOSE))) {
		PEMerror(ERR_R_BUF_LIB);
		return NULL;
	}
	ret = d2i_PKCS8PrivateKey_bio(bp, x, cb, u);
	BIO_free(bp);
	return ret;
}
LCRYPTO_ALIAS(d2i_PKCS8PrivateKey_fp);

X509_SIG *
PEM_read_PKCS8(FILE *fp, X509_SIG **x, pem_password_cb *cb, void *u)
{
	return PEM_ASN1_read((d2i_of_void *)d2i_X509_SIG, PEM_STRING_PKCS8, fp,
	    (void **)x, cb, u);
}
LCRYPTO_ALIAS(PEM_read_PKCS8);

int
PEM_write_PKCS8(FILE *fp, X509_SIG *x)
{
	return PEM_ASN1_write((i2d_of_void *)i2d_X509_SIG, PEM_STRING_PKCS8, fp,
	    x, NULL, NULL, 0, NULL, NULL);
}
LCRYPTO_ALIAS(PEM_write_PKCS8);

X509_SIG *
PEM_read_bio_PKCS8(BIO *bp, X509_SIG **x, pem_password_cb *cb, void *u)
{
	return PEM_ASN1_read_bio((d2i_of_void *)d2i_X509_SIG, PEM_STRING_PKCS8, bp,
	    (void **)x, cb, u);
}
LCRYPTO_ALIAS(PEM_read_bio_PKCS8);

int
PEM_write_bio_PKCS8(BIO *bp, X509_SIG *x)
{
	return PEM_ASN1_write_bio((i2d_of_void *)i2d_X509_SIG, PEM_STRING_PKCS8, bp,
	    x, NULL, NULL, 0, NULL, NULL);
}
LCRYPTO_ALIAS(PEM_write_bio_PKCS8);

PKCS8_PRIV_KEY_INFO *
PEM_read_PKCS8_PRIV_KEY_INFO(FILE *fp, PKCS8_PRIV_KEY_INFO **x, pem_password_cb *cb, void *u)
{
	return PEM_ASN1_read((d2i_of_void *)d2i_PKCS8_PRIV_KEY_INFO, PEM_STRING_PKCS8INF, fp,
	    (void **)x, cb, u);
}
LCRYPTO_ALIAS(PEM_read_PKCS8_PRIV_KEY_INFO);

int
PEM_write_PKCS8_PRIV_KEY_INFO(FILE *fp, PKCS8_PRIV_KEY_INFO *x)
{
	return PEM_ASN1_write((i2d_of_void *)i2d_PKCS8_PRIV_KEY_INFO, PEM_STRING_PKCS8INF, fp,
	    x, NULL, NULL, 0, NULL, NULL);
}
LCRYPTO_ALIAS(PEM_write_PKCS8_PRIV_KEY_INFO);

PKCS8_PRIV_KEY_INFO *
PEM_read_bio_PKCS8_PRIV_KEY_INFO(BIO *bp, PKCS8_PRIV_KEY_INFO **x, pem_password_cb *cb, void *u)
{
	return PEM_ASN1_read_bio((d2i_of_void *)d2i_PKCS8_PRIV_KEY_INFO, PEM_STRING_PKCS8INF, bp,
	    (void **)x, cb, u);
}
LCRYPTO_ALIAS(PEM_read_bio_PKCS8_PRIV_KEY_INFO);

int
PEM_write_bio_PKCS8_PRIV_KEY_INFO(BIO *bp, PKCS8_PRIV_KEY_INFO *x)
{
	return PEM_ASN1_write_bio((i2d_of_void *)i2d_PKCS8_PRIV_KEY_INFO, PEM_STRING_PKCS8INF, bp,
	    x, NULL, NULL, 0, NULL, NULL);
}
LCRYPTO_ALIAS(PEM_write_bio_PKCS8_PRIV_KEY_INFO);