crypto/evp/pmeth_lib.c

   1 /* pmeth_lib.c */
   2 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
   3  * project 2006.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 2006 The OpenSSL Project.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in
  17  *    the documentation and/or other materials provided with the
  18  *    distribution.
  19  *
  20  * 3. All advertising materials mentioning features or use of this
  21  *    software must display the following acknowledgment:
  22  *    "This product includes software developed by the OpenSSL Project
  23  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  24  *
  25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  26  *    endorse or promote products derived from this software without
  27  *    prior written permission. For written permission, please contact
  28  *    licensing@OpenSSL.org.
  29  *
  30  * 5. Products derived from this software may not be called "OpenSSL"
  31  *    nor may "OpenSSL" appear in their names without prior written
  32  *    permission of the OpenSSL Project.
  33  *
  34  * 6. Redistributions of any form whatsoever must retain the following
  35  *    acknowledgment:
  36  *    "This product includes software developed by the OpenSSL Project
  37  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  38  *
  39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  50  * OF THE POSSIBILITY OF SUCH DAMAGE.
  51  * ====================================================================
  52  *
  53  * This product includes cryptographic software written by Eric Young
  54  * (eay@cryptsoft.com).  This product includes software written by Tim
  55  * Hudson (tjh@cryptsoft.com).
  56  *
  57  */
  58
  59 #include <stdio.h>
  60 #include <stdlib.h>
  61 #include <openssl/objects.h>
  62 #include "cryptlib.h"
  63 #include <openssl/evp.h>
  64 #include "asn1_locl.h"
  65 #include "evp_locl.h"
  66
  67 STACK *app_pkey_methods = NULL;
  68
  69 extern EVP_PKEY_METHOD rsa_pkey_meth;
  70
  71 static const EVP_PKEY_METHOD *standard_methods[] =
  72         {
  73         &rsa_pkey_meth
  74         };
  75
  76 static int pmeth_cmp(const EVP_PKEY_METHOD * const *a,
  77                 const EVP_PKEY_METHOD * const *b)
  78         {
  79         return ((*a)->pkey_id - (*b)->pkey_id);
  80         }
  81
  82 const EVP_PKEY_METHOD *EVP_PKEY_meth_find(int type, ENGINE *e)
  83         {
  84         EVP_PKEY_METHOD tmp, *t = &tmp, **ret;
  85         tmp.pkey_id = type;
  86         if (app_pkey_methods)
  87                 {
  88                 int idx;
  89                 idx = sk_find(app_pkey_methods, (char *)&tmp);
  90                 if (idx >= 0)
  91                         return (EVP_PKEY_METHOD *)
  92                                 sk_value(app_pkey_methods, idx);
  93                 }
  94         ret = (EVP_PKEY_METHOD **) OBJ_bsearch((char *)&t,
  95                         (char *)standard_methods,
  96                         sizeof(standard_methods)/sizeof(EVP_PKEY_METHOD *),
  97                         sizeof(EVP_PKEY_METHOD *),
  98                         (int (*)(const void *, const void *))pmeth_cmp);
  99         if (!ret || !*ret)
 100                 return NULL;
 101         return *ret;
 102         }
 103
 104 EVP_PKEY_CTX *EVP_PKEY_CTX_new(EVP_PKEY *pkey)
 105         {
 106         EVP_PKEY_CTX *ret;
 107         const EVP_PKEY_METHOD *pmeth;
 108         if (!pkey || !pkey->ameth)
 109                 return NULL;
 110         pmeth = EVP_PKEY_meth_find(pkey->ameth->pkey_id, NULL);
 111         if (pmeth == NULL)
 112                 return NULL;
 113         ret = OPENSSL_malloc(sizeof(EVP_PKEY_CTX));
 114         ret->pmeth = pmeth;
 115         ret->operation = EVP_PKEY_OP_UNDEFINED;
 116         CRYPTO_add(&pkey->references,1,CRYPTO_LOCK_EVP_PKEY);
 117         ret->pkey = pkey;
 118         ret->data = NULL;
 119
 120         if (pmeth->init)
 121                 {
 122                 if (pmeth->init(ret) <= 0)
 123                         {
 124                         EVP_PKEY_CTX_free(ret);
 125                         return NULL;
 126                         }
 127                 }
 128
 129         return ret;
 130         }
 131
 132 void EVP_PKEY_CTX_free(EVP_PKEY_CTX *ctx)
 133         {
 134         if (ctx->pmeth && ctx->pmeth->cleanup)
 135                 ctx->pmeth->cleanup(ctx);
 136         if (ctx->pkey)
 137                 EVP_PKEY_free(ctx->pkey);
 138         OPENSSL_free(ctx);
 139         }
 140
 141 int EVP_PKEY_CTX_ctrl(EVP_PKEY_CTX *ctx, int keytype, int optype,
 142                                 int cmd, int p1, void *p2)
 143         {
 144         int ret;
 145         if (!ctx || !ctx->pmeth || !ctx->pmeth->ctrl)
 146                 {
 147                 EVPerr(EVP_F_EVP_PKEY_CTX_CTRL, EVP_R_COMMAND_NOT_SUPPORTED);
 148                 return -2;
 149                 }
 150         if ((keytype != -1) && (ctx->pmeth->pkey_id != keytype))
 151                 return -1;
 152
 153         if (ctx->operation == EVP_PKEY_OP_UNDEFINED)
 154                 {
 155                 EVPerr(EVP_F_EVP_PKEY_CTX_CTRL, EVP_R_NO_OPERATION_SET);
 156                 return -1;
 157                 }
 158
 159         if ((optype != -1) && (ctx->operation != optype))
 160                 {
 161                 EVPerr(EVP_F_EVP_PKEY_CTX_CTRL, EVP_R_INVALID_OPERATION);
 162                 return -1;
 163                 }
 164
 165         ret = ctx->pmeth->ctrl(ctx, cmd, p1, p2);
 166
 167         if (ret == -2)
 168                 EVPerr(EVP_F_EVP_PKEY_CTX_CTRL, EVP_R_COMMAND_NOT_SUPPORTED);
 169
 170         return ret;
 171
 172         }
 173
 174 int EVP_PKEY_CTX_ctrl_str(EVP_PKEY_CTX *ctx, char *name, char *value)
 175         {
 176         if (!ctx || !ctx->pmeth || !ctx->pmeth->ctrl)
 177                 {
 178                 EVPerr(EVP_F_EVP_PKEY_CTX_CTRL, EVP_R_COMMAND_NOT_SUPPORTED);
 179                 return -2;
 180                 }
 181         return ctx->pmeth->ctrl_str(ctx, name, value);
 182         }