pem_pkey.c

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/* crypto/pem/pem_pkey.c */
/* Copyright (C) 1995-1998 Eric Young ([email protected])
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young ([email protected]).
 * 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 ([email protected]).
 * 
 * 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 ([email protected])"
 *    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 ([email protected])"
 * 
 * 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 "cryptlib.h"
#include <openssl/buffer.h>
#include <openssl/objects.h>
#include <openssl/evp.h>
#include <openssl/rand.h>
#include <openssl/x509.h>
#include <openssl/pkcs12.h>
#include <openssl/pem.h>
#ifndef OPENSSL_NO_ENGINE
#include <openssl/engine.h>
#endif
#include "asn1_locl.h"

int pem_check_suffix(const char *pem_str, const char *suffix);

EVP_PKEY *PEM_read_bio_PrivateKey(BIO *bp, EVP_PKEY **x, pem_password_cb *cb, void *u)
    {
    char *nm=NULL;
    const unsigned char *p=NULL;
    unsigned char *data=NULL;
    long len;
    int slen;
    EVP_PKEY *ret=NULL;

    if (!PEM_bytes_read_bio(&data, &len, &nm, PEM_STRING_EVP_PKEY, bp, cb, u))
        return NULL;
    p = data;

    if (strcmp(nm,PEM_STRING_PKCS8INF) == 0) {
        PKCS8_PRIV_KEY_INFO *p8inf;
        p8inf=d2i_PKCS8_PRIV_KEY_INFO(NULL, &p, len);
        if(!p8inf) goto p8err;
        ret = EVP_PKCS82PKEY(p8inf);
        if(x) {
            if(*x) EVP_PKEY_free((EVP_PKEY *)*x);
            *x = ret;
        }
        PKCS8_PRIV_KEY_INFO_free(p8inf);
    } else if (strcmp(nm,PEM_STRING_PKCS8) == 0) {
        PKCS8_PRIV_KEY_INFO *p8inf;
        X509_SIG *p8;
        int klen;
        char psbuf[PEM_BUFSIZE];
        p8 = d2i_X509_SIG(NULL, &p, len);
        if(!p8) goto p8err;
        if (cb) klen=cb(psbuf,PEM_BUFSIZE,0,u);
        else klen=PEM_def_callback(psbuf,PEM_BUFSIZE,0,u);
        if (klen <= 0) {
            PEMerr(PEM_F_PEM_READ_BIO_PRIVATEKEY,
                    PEM_R_BAD_PASSWORD_READ);
            X509_SIG_free(p8);
            goto err;
        }
        p8inf = PKCS8_decrypt(p8, psbuf, klen);
        X509_SIG_free(p8);
        if(!p8inf) goto p8err;
        ret = EVP_PKCS82PKEY(p8inf);
        if(x) {
            if(*x) EVP_PKEY_free((EVP_PKEY *)*x);
            *x = ret;
        }
        PKCS8_PRIV_KEY_INFO_free(p8inf);
    } else if ((slen = pem_check_suffix(nm, "PRIVATE KEY")) > 0)
        {
        const EVP_PKEY_ASN1_METHOD *ameth;
        ameth = EVP_PKEY_asn1_find_str(NULL, nm, slen);
        if (!ameth || !ameth->old_priv_decode)
            goto p8err;
        ret=d2i_PrivateKey(ameth->pkey_id,x,&p,len);
        }
p8err:
    if (ret == NULL)
        PEMerr(PEM_F_PEM_READ_BIO_PRIVATEKEY,ERR_R_ASN1_LIB);
err:
    OPENSSL_free(nm);
    OPENSSL_cleanse(data, len);
    OPENSSL_free(data);
    return(ret);
    }

int PEM_write_bio_PrivateKey(BIO *bp, EVP_PKEY *x, const EVP_CIPHER *enc,
                                               unsigned char *kstr, int klen,
                                               pem_password_cb *cb, void *u)
    {
    char pem_str[80];
    if (!x->ameth || x->ameth->priv_encode)
        return PEM_write_bio_PKCS8PrivateKey(bp, x, enc,
                            (char *)kstr, klen,
                            cb, u);

    BIO_snprintf(pem_str, 80, "%s PRIVATE KEY", x->ameth->pem_str);
    return PEM_ASN1_write_bio((i2d_of_void *)i2d_PrivateKey,
                pem_str,bp,x,enc,kstr,klen,cb,u);
    }

EVP_PKEY *PEM_read_bio_Parameters(BIO *bp, EVP_PKEY **x)
    {
    char *nm=NULL;
    const unsigned char *p=NULL;
    unsigned char *data=NULL;
    long len;
    int slen;
    EVP_PKEY *ret=NULL;

    if (!PEM_bytes_read_bio(&data, &len, &nm, PEM_STRING_PARAMETERS,
                                bp, 0, NULL))
        return NULL;
    p = data;

    if ((slen = pem_check_suffix(nm, "PARAMETERS")) > 0)
        {
        ret = EVP_PKEY_new();
        if (!ret)
            goto err;
        if (!EVP_PKEY_set_type_str(ret, nm, slen)
            || !ret->ameth->param_decode
            || !ret->ameth->param_decode(ret, &p, len))
            {
            EVP_PKEY_free(ret);
            ret = NULL;
            goto err;
            }
        if(x)
            {
            if(*x) EVP_PKEY_free((EVP_PKEY *)*x);
            *x = ret;
            }
        }
err:
    if (ret == NULL)
        PEMerr(PEM_F_PEM_READ_BIO_PARAMETERS,ERR_R_ASN1_LIB);
    OPENSSL_free(nm);
    OPENSSL_free(data);
    return(ret);
    }

int PEM_write_bio_Parameters(BIO *bp, EVP_PKEY *x)
    {
    char pem_str[80];
    if (!x->ameth || !x->ameth->param_encode)
        return 0;

    BIO_snprintf(pem_str, 80, "%s PARAMETERS", x->ameth->pem_str);
    return PEM_ASN1_write_bio(
        (i2d_of_void *)x->ameth->param_encode,
                pem_str,bp,x,NULL,NULL,0,0,NULL);
    }

#ifndef OPENSSL_NO_FP_API
EVP_PKEY *PEM_read_PrivateKey(FILE *fp, EVP_PKEY **x, pem_password_cb *cb, void *u)
    {
        BIO *b;
        EVP_PKEY *ret;

        if ((b=BIO_new(BIO_s_file())) == NULL)
        {
        PEMerr(PEM_F_PEM_READ_PRIVATEKEY,ERR_R_BUF_LIB);
                return(0);
        }
        BIO_set_fp(b,fp,BIO_NOCLOSE);
        ret=PEM_read_bio_PrivateKey(b,x,cb,u);
        BIO_free(b);
        return(ret);
    }

int PEM_write_PrivateKey(FILE *fp, EVP_PKEY *x, const EVP_CIPHER *enc,
                                               unsigned char *kstr, int klen,
                                               pem_password_cb *cb, void *u)
    {
        BIO *b;
        int ret;

        if ((b=BIO_new_fp(fp, BIO_NOCLOSE)) == NULL)
        {
        PEMerr(PEM_F_PEM_WRITE_PRIVATEKEY,ERR_R_BUF_LIB);
                return 0;
        }
        ret=PEM_write_bio_PrivateKey(b, x, enc, kstr, klen, cb, u);
        BIO_free(b);
        return ret;
    }

#endif