x_pubkey.c

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/* crypto/asn1/x_pubkey.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/asn1t.h>
#include <openssl/x509.h>
#include "asn1_locl.h"
#ifndef OPENSSL_NO_RSA
#include <openssl/rsa.h>
#endif
#ifndef OPENSSL_NO_DSA
#include <openssl/dsa.h>
#endif

/* Minor tweak to operation: free up EVP_PKEY */
static int pubkey_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
            void *exarg)
    {
    if (operation == ASN1_OP_FREE_POST)
        {
        X509_PUBKEY *pubkey = (X509_PUBKEY *)*pval;
        EVP_PKEY_free(pubkey->pkey);
        }
    return 1;
    }

ASN1_SEQUENCE_cb(X509_PUBKEY, pubkey_cb) = {
    ASN1_SIMPLE(X509_PUBKEY, algor, X509_ALGOR),
    ASN1_SIMPLE(X509_PUBKEY, public_key, ASN1_BIT_STRING)
} ASN1_SEQUENCE_END_cb(X509_PUBKEY, X509_PUBKEY)

IMPLEMENT_ASN1_FUNCTIONS(X509_PUBKEY)

int X509_PUBKEY_set(X509_PUBKEY **x, EVP_PKEY *pkey)
    {
    X509_PUBKEY *pk=NULL;

    if (x == NULL) return(0);

    if ((pk=X509_PUBKEY_new()) == NULL) goto error;

    if (pkey->ameth)
        {
        if (pkey->ameth->pub_encode)
            {
            if (!pkey->ameth->pub_encode(pk, pkey))
                {
                X509err(X509_F_X509_PUBKEY_SET,
                    X509_R_PUBLIC_KEY_ENCODE_ERROR);
                goto error;
                }
            }
        else
            {
            X509err(X509_F_X509_PUBKEY_SET,
                X509_R_METHOD_NOT_SUPPORTED);
            goto error;
            }
        }
    else
        {
        X509err(X509_F_X509_PUBKEY_SET,X509_R_UNSUPPORTED_ALGORITHM);
        goto error;
        }

    if (*x != NULL)
        X509_PUBKEY_free(*x);

    *x=pk;

    return 1;
error:
    if (pk != NULL) X509_PUBKEY_free(pk);
    return 0;
    }

EVP_PKEY *X509_PUBKEY_get(X509_PUBKEY *key)
    {
    EVP_PKEY *ret=NULL;

    if (key == NULL) goto error;

    if (key->pkey != NULL)
        {
        CRYPTO_add(&key->pkey->references, 1, CRYPTO_LOCK_EVP_PKEY);
        return key->pkey;
        }

    if (key->public_key == NULL) goto error;

    if ((ret = EVP_PKEY_new()) == NULL)
        {
        X509err(X509_F_X509_PUBKEY_GET, ERR_R_MALLOC_FAILURE);
        goto error;
        }

    if (!EVP_PKEY_set_type(ret, OBJ_obj2nid(key->algor->algorithm)))
        {
        X509err(X509_F_X509_PUBKEY_GET,X509_R_UNSUPPORTED_ALGORITHM);
        goto error;
        }

    if (ret->ameth->pub_decode)
        {
        if (!ret->ameth->pub_decode(ret, key))
            {
            X509err(X509_F_X509_PUBKEY_GET,
                        X509_R_PUBLIC_KEY_DECODE_ERROR);
            goto error;
            }
        }
    else
        {
        X509err(X509_F_X509_PUBKEY_GET, X509_R_METHOD_NOT_SUPPORTED);
        goto error;
        }

    /* Check to see if another thread set key->pkey first */
    CRYPTO_w_lock(CRYPTO_LOCK_EVP_PKEY);
    if (key->pkey)
        {
        EVP_PKEY_free(ret);
        ret = key->pkey;
        }
    else
        key->pkey = ret;
    CRYPTO_w_unlock(CRYPTO_LOCK_EVP_PKEY);
    CRYPTO_add(&ret->references, 1, CRYPTO_LOCK_EVP_PKEY);

    return ret;

    error:
    if (ret != NULL)
        EVP_PKEY_free(ret);
    return(NULL);
    }

/* Now two pseudo ASN1 routines that take an EVP_PKEY structure
 * and encode or decode as X509_PUBKEY
 */

EVP_PKEY *d2i_PUBKEY(EVP_PKEY **a, const unsigned char **pp,
         long length)
    {
    X509_PUBKEY *xpk;
    EVP_PKEY *pktmp;
    xpk = d2i_X509_PUBKEY(NULL, pp, length);
    if(!xpk) return NULL;
    pktmp = X509_PUBKEY_get(xpk);
    X509_PUBKEY_free(xpk);
    if(!pktmp) return NULL;
    if(a)
        {
        EVP_PKEY_free(*a);
        *a = pktmp;
        }
    return pktmp;
    }

int i2d_PUBKEY(EVP_PKEY *a, unsigned char **pp)
    {
    X509_PUBKEY *xpk=NULL;
    int ret;
    if(!a) return 0;
    if(!X509_PUBKEY_set(&xpk, a)) return 0;
    ret = i2d_X509_PUBKEY(xpk, pp);
    X509_PUBKEY_free(xpk);
    return ret;
    }

/* The following are equivalents but which return RSA and DSA
 * keys
 */
#ifndef OPENSSL_NO_RSA
RSA *d2i_RSA_PUBKEY(RSA **a, const unsigned char **pp,
         long length)
    {
    EVP_PKEY *pkey;
    RSA *key;
    const unsigned char *q;
    q = *pp;
    pkey = d2i_PUBKEY(NULL, &q, length);
    if (!pkey) return NULL;
    key = EVP_PKEY_get1_RSA(pkey);
    EVP_PKEY_free(pkey);
    if (!key) return NULL;
    *pp = q;
    if (a)
        {
        RSA_free(*a);
        *a = key;
        }
    return key;
    }

int i2d_RSA_PUBKEY(RSA *a, unsigned char **pp)
    {
    EVP_PKEY *pktmp;
    int ret;
    if (!a) return 0;
    pktmp = EVP_PKEY_new();
    if (!pktmp)
        {
        ASN1err(ASN1_F_I2D_RSA_PUBKEY, ERR_R_MALLOC_FAILURE);
        return 0;
        }
    EVP_PKEY_set1_RSA(pktmp, a);
    ret = i2d_PUBKEY(pktmp, pp);
    EVP_PKEY_free(pktmp);
    return ret;
    }
#endif

#ifndef OPENSSL_NO_DSA
DSA *d2i_DSA_PUBKEY(DSA **a, const unsigned char **pp,
         long length)
    {
    EVP_PKEY *pkey;
    DSA *key;
    const unsigned char *q;
    q = *pp;
    pkey = d2i_PUBKEY(NULL, &q, length);
    if (!pkey) return NULL;
    key = EVP_PKEY_get1_DSA(pkey);
    EVP_PKEY_free(pkey);
    if (!key) return NULL;
    *pp = q;
    if (a)
        {
        DSA_free(*a);
        *a = key;
        }
    return key;
    }

int i2d_DSA_PUBKEY(DSA *a, unsigned char **pp)
    {
    EVP_PKEY *pktmp;
    int ret;
    if(!a) return 0;
    pktmp = EVP_PKEY_new();
    if(!pktmp)
        {
        ASN1err(ASN1_F_I2D_DSA_PUBKEY, ERR_R_MALLOC_FAILURE);
        return 0;
        }
    EVP_PKEY_set1_DSA(pktmp, a);
    ret = i2d_PUBKEY(pktmp, pp);
    EVP_PKEY_free(pktmp);
    return ret;
    }
#endif

#ifndef OPENSSL_NO_EC
EC_KEY *d2i_EC_PUBKEY(EC_KEY **a, const unsigned char **pp, long length)
    {
    EVP_PKEY *pkey;
    EC_KEY *key;
    const unsigned char *q;
    q = *pp;
    pkey = d2i_PUBKEY(NULL, &q, length);
    if (!pkey) return(NULL);
    key = EVP_PKEY_get1_EC_KEY(pkey);
    EVP_PKEY_free(pkey);
    if (!key)  return(NULL);
    *pp = q;
    if (a)
        {
        EC_KEY_free(*a);
        *a = key;
        }
    return(key);
    }

int i2d_EC_PUBKEY(EC_KEY *a, unsigned char **pp)
    {
    EVP_PKEY *pktmp;
    int ret;
    if (!a) return(0);
    if ((pktmp = EVP_PKEY_new()) == NULL)
        {
        ASN1err(ASN1_F_I2D_EC_PUBKEY, ERR_R_MALLOC_FAILURE);
        return(0);
        }
    EVP_PKEY_set1_EC_KEY(pktmp, a);
    ret = i2d_PUBKEY(pktmp, pp);
    EVP_PKEY_free(pktmp);
    return(ret);
    }
#endif

int X509_PUBKEY_set0_param(X509_PUBKEY *pub, ASN1_OBJECT *aobj,
                    int ptype, void *pval,
                    unsigned char *penc, int penclen)
    {
    if (!X509_ALGOR_set0(pub->algor, aobj, ptype, pval))
        return 0;
    if (penc)
        {
        if (pub->public_key->data)
            OPENSSL_free(pub->public_key->data);
        pub->public_key->data = penc;
        pub->public_key->length = penclen;
        /* Set number of unused bits to zero */
        pub->public_key->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07);
        pub->public_key->flags|=ASN1_STRING_FLAG_BITS_LEFT;
        }
    return 1;
    }

int X509_PUBKEY_get0_param(ASN1_OBJECT **ppkalg,
        const unsigned char **pk, int *ppklen,
        X509_ALGOR **pa,
        X509_PUBKEY *pub)
    {
    if (ppkalg)
        *ppkalg = pub->algor->algorithm;
    if (pk)
        {
        *pk = pub->public_key->data;
        *ppklen = pub->public_key->length;
        }
    if (pa)
        *pa = pub->algor;
    return 1;
    }