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pmeth_lib.c
/* pmeth_lib.c */
/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
 * project 2006.
 */
/* ====================================================================
 * Copyright (c) 2006 The OpenSSL Project.  All rights reserved.
 *
 * 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 above 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 acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    licensing@OpenSSL.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED 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 OpenSSL PROJECT OR
 * ITS 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.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */

#include <stdio.h>
#include <stdlib.h>
#include "cryptlib.h"
#include <openssl/objects.h>
#include <openssl/evp.h>
#ifndef OPENSSL_NO_ENGINE
#include <openssl/engine.h>
#endif
#include "asn1_locl.h"
#include "evp_locl.h"

typedef int sk_cmp_fn_type(const char * const *a, const char * const *b);

DECLARE_STACK_OF(EVP_PKEY_METHOD)
STACK_OF(EVP_PKEY_METHOD) *app_pkey_methods = NULL;

extern const EVP_PKEY_METHOD rsa_pkey_meth, dh_pkey_meth, dsa_pkey_meth;
extern const EVP_PKEY_METHOD ec_pkey_meth, hmac_pkey_meth;

static const EVP_PKEY_METHOD *standard_methods[] =
      {
#ifndef OPENSSL_NO_RSA
      &rsa_pkey_meth,
#endif
#ifndef OPENSSL_NO_DH
      &dh_pkey_meth,
#endif
#ifndef OPENSSL_NO_DSA
      &dsa_pkey_meth,
#endif
#ifndef OPENSSL_NO_EC
      &ec_pkey_meth,
#endif
      &hmac_pkey_meth,
      };

DECLARE_OBJ_BSEARCH_CMP_FN(const EVP_PKEY_METHOD *, const EVP_PKEY_METHOD *,
                     pmeth);

static int pmeth_cmp(const EVP_PKEY_METHOD * const *a,
                 const EVP_PKEY_METHOD * const *b)
      {
        return ((*a)->pkey_id - (*b)->pkey_id);
      }

IMPLEMENT_OBJ_BSEARCH_CMP_FN(const EVP_PKEY_METHOD *, const EVP_PKEY_METHOD *,
                       pmeth);

const EVP_PKEY_METHOD *EVP_PKEY_meth_find(int type)
      {
      EVP_PKEY_METHOD tmp;
      const EVP_PKEY_METHOD *t = &tmp, **ret;
      tmp.pkey_id = type;
      if (app_pkey_methods)
            {
            int idx;
            idx = sk_EVP_PKEY_METHOD_find(app_pkey_methods, &tmp);
            if (idx >= 0)
                  return sk_EVP_PKEY_METHOD_value(app_pkey_methods, idx);
            }
      ret = OBJ_bsearch_pmeth(&t, standard_methods,
                    sizeof(standard_methods)/sizeof(EVP_PKEY_METHOD *));
      if (!ret || !*ret)
            return NULL;
      return *ret;
      }

static EVP_PKEY_CTX *int_ctx_new(EVP_PKEY *pkey, ENGINE *e, int id)
      {
      EVP_PKEY_CTX *ret;
      const EVP_PKEY_METHOD *pmeth;
      if (id == -1)
            {
            if (!pkey || !pkey->ameth)
                  return NULL;
            id = pkey->ameth->pkey_id;
            }
#ifndef OPENSSL_NO_ENGINE
      if (pkey && pkey->engine)
            e = pkey->engine;
      /* Try to find an ENGINE which implements this method */
      if (e)
            {
            if (!ENGINE_init(e))
                  {
                  EVPerr(EVP_F_INT_CTX_NEW,ERR_R_ENGINE_LIB);
                  return NULL;
                  }
            }
      else
            e = ENGINE_get_pkey_meth_engine(id);

      /* If an ENGINE handled this method look it up. Othewise
       * use internal tables.
       */

      if (e)
            pmeth = ENGINE_get_pkey_meth(e, id);
      else
#endif
            pmeth = EVP_PKEY_meth_find(id);

      if (pmeth == NULL)
            {
            EVPerr(EVP_F_INT_CTX_NEW,EVP_R_UNSUPPORTED_ALGORITHM);
            return NULL;
            }

      ret = OPENSSL_malloc(sizeof(EVP_PKEY_CTX));
      if (!ret)
            {
#ifndef OPENSSL_NO_ENGINE
            if (e)
                  ENGINE_finish(e);
#endif
            EVPerr(EVP_F_INT_CTX_NEW,ERR_R_MALLOC_FAILURE);
            return NULL;
            }
      ret->engine = e;
      ret->pmeth = pmeth;
      ret->operation = EVP_PKEY_OP_UNDEFINED;
      ret->pkey = pkey;
      ret->peerkey = NULL;
      ret->pkey_gencb = 0;
      if (pkey)
            CRYPTO_add(&pkey->references,1,CRYPTO_LOCK_EVP_PKEY);
      ret->data = NULL;

      if (pmeth->init)
            {
            if (pmeth->init(ret) <= 0)
                  {
                  EVP_PKEY_CTX_free(ret);
                  return NULL;
                  }
            }

      return ret;
      }

EVP_PKEY_METHOD* EVP_PKEY_meth_new(int id, int flags)
      {
      EVP_PKEY_METHOD *pmeth;
      pmeth = OPENSSL_malloc(sizeof(EVP_PKEY_METHOD));
      if (!pmeth)
            return NULL;

      pmeth->pkey_id = id;
      pmeth->flags = flags | EVP_PKEY_FLAG_DYNAMIC;

      pmeth->init = 0;
      pmeth->copy = 0;
      pmeth->cleanup = 0;
      pmeth->paramgen_init = 0;
      pmeth->paramgen = 0;
      pmeth->keygen_init = 0;
      pmeth->keygen = 0;
      pmeth->sign_init = 0;
      pmeth->sign = 0;
      pmeth->verify_init = 0;
      pmeth->verify = 0;
      pmeth->verify_recover_init = 0;
      pmeth->verify_recover = 0;
      pmeth->signctx_init = 0;
      pmeth->signctx = 0;
      pmeth->verifyctx_init = 0;
      pmeth->verifyctx = 0;
      pmeth->encrypt_init = 0;
      pmeth->encrypt = 0;
      pmeth->decrypt_init = 0;
      pmeth->decrypt = 0;
      pmeth->derive_init = 0;
      pmeth->derive = 0;
      pmeth->ctrl = 0;
      pmeth->ctrl_str = 0;

      return pmeth;
      }

void EVP_PKEY_meth_free(EVP_PKEY_METHOD *pmeth)
      {
      if (pmeth && (pmeth->flags & EVP_PKEY_FLAG_DYNAMIC))
            OPENSSL_free(pmeth);
      }

EVP_PKEY_CTX *EVP_PKEY_CTX_new(EVP_PKEY *pkey, ENGINE *e)
      {
      return int_ctx_new(pkey, e, -1);
      }

EVP_PKEY_CTX *EVP_PKEY_CTX_new_id(int id, ENGINE *e)
      {
      return int_ctx_new(NULL, e, id);
      }

EVP_PKEY_CTX *EVP_PKEY_CTX_dup(EVP_PKEY_CTX *pctx)
      {
      EVP_PKEY_CTX *rctx;
      if (!pctx->pmeth || !pctx->pmeth->copy)
            return NULL;
#ifndef OPENSSL_NO_ENGINE
      /* Make sure it's safe to copy a pkey context using an ENGINE */
      if (pctx->engine && !ENGINE_init(pctx->engine))
            {
            EVPerr(EVP_F_EVP_PKEY_CTX_DUP,ERR_R_ENGINE_LIB);
            return 0;
            }
#endif
      rctx = OPENSSL_malloc(sizeof(EVP_PKEY_CTX));
      if (!rctx)
            return NULL;

      rctx->pmeth = pctx->pmeth;
#ifndef OPENSSL_NO_ENGINE
      rctx->engine = pctx->engine;
#endif

      if (pctx->pkey)
            CRYPTO_add(&pctx->pkey->references,1,CRYPTO_LOCK_EVP_PKEY);

      rctx->pkey = pctx->pkey;

      if (pctx->peerkey)
            CRYPTO_add(&pctx->peerkey->references,1,CRYPTO_LOCK_EVP_PKEY);

      rctx->peerkey = pctx->peerkey;

      rctx->data = NULL;
      rctx->app_data = NULL;
      rctx->operation = pctx->operation;

      if (pctx->pmeth->copy(rctx, pctx) > 0)
            return rctx;

      EVP_PKEY_CTX_free(rctx);
      return NULL;

      }

int EVP_PKEY_meth_add0(const EVP_PKEY_METHOD *pmeth)
      {
      if (app_pkey_methods == NULL)
            {
            app_pkey_methods = sk_EVP_PKEY_METHOD_new(pmeth_cmp);
            if (!app_pkey_methods)
                  return 0;
            }
      if (!sk_EVP_PKEY_METHOD_push(app_pkey_methods, pmeth))
            return 0;
      sk_EVP_PKEY_METHOD_sort(app_pkey_methods);
      return 1;
      }

void EVP_PKEY_CTX_free(EVP_PKEY_CTX *ctx)
      {
      if (ctx == NULL)
            return;
      if (ctx->pmeth && ctx->pmeth->cleanup)
            ctx->pmeth->cleanup(ctx);
      if (ctx->pkey)
            EVP_PKEY_free(ctx->pkey);
      if (ctx->peerkey)
            EVP_PKEY_free(ctx->peerkey);
#ifndef OPENSSL_NO_ENGINE
      if(ctx->engine)
            /* The EVP_PKEY_CTX we used belongs to an ENGINE, release the
             * functional reference we held for this reason. */
            ENGINE_finish(ctx->engine);
#endif
      OPENSSL_free(ctx);
      }

int EVP_PKEY_CTX_ctrl(EVP_PKEY_CTX *ctx, int keytype, int optype,
                        int cmd, int p1, void *p2)
      {
      int ret;
      if (!ctx || !ctx->pmeth || !ctx->pmeth->ctrl)
            {
            EVPerr(EVP_F_EVP_PKEY_CTX_CTRL, EVP_R_COMMAND_NOT_SUPPORTED);
            return -2;
            }
      if ((keytype != -1) && (ctx->pmeth->pkey_id != keytype))
            return -1;

      if (ctx->operation == EVP_PKEY_OP_UNDEFINED)
            {
            EVPerr(EVP_F_EVP_PKEY_CTX_CTRL, EVP_R_NO_OPERATION_SET);
            return -1;
            }

      if ((optype != -1) && !(ctx->operation & optype))
            {
            EVPerr(EVP_F_EVP_PKEY_CTX_CTRL, EVP_R_INVALID_OPERATION);
            return -1;
            }

      ret = ctx->pmeth->ctrl(ctx, cmd, p1, p2);

      if (ret == -2)
            EVPerr(EVP_F_EVP_PKEY_CTX_CTRL, EVP_R_COMMAND_NOT_SUPPORTED);

      return ret;

      }

int EVP_PKEY_CTX_ctrl_str(EVP_PKEY_CTX *ctx,
                              const char *name, const char *value)
      {
      if (!ctx || !ctx->pmeth || !ctx->pmeth->ctrl_str)
            {
            EVPerr(EVP_F_EVP_PKEY_CTX_CTRL_STR,
                                    EVP_R_COMMAND_NOT_SUPPORTED);
            return -2;
            }
      if (!strcmp(name, "digest"))
            {
            const EVP_MD *md;
            if (!value || !(md = EVP_get_digestbyname(value)))
                  {
                  EVPerr(EVP_F_EVP_PKEY_CTX_CTRL_STR,
                                    EVP_R_INVALID_DIGEST);
                  return 0;
                  }
            return EVP_PKEY_CTX_set_signature_md(ctx, md);
            }
      return ctx->pmeth->ctrl_str(ctx, name, value);
      }

int EVP_PKEY_CTX_get_operation(EVP_PKEY_CTX *ctx)
      {
      return ctx->operation;
      }

void EVP_PKEY_CTX_set0_keygen_info(EVP_PKEY_CTX *ctx, int *dat, int datlen)
      {
      ctx->keygen_info = dat;
      ctx->keygen_info_count = datlen;
      }

void EVP_PKEY_CTX_set_data(EVP_PKEY_CTX *ctx, void *data)
      {
      ctx->data = data;
      }

void *EVP_PKEY_CTX_get_data(EVP_PKEY_CTX *ctx)
      {
      return ctx->data;
      }

EVP_PKEY *EVP_PKEY_CTX_get0_pkey(EVP_PKEY_CTX *ctx)
      {
      return ctx->pkey;
      }

EVP_PKEY *EVP_PKEY_CTX_get0_peerkey(EVP_PKEY_CTX *ctx)
      {
      return ctx->peerkey;
      }
      
void EVP_PKEY_CTX_set_app_data(EVP_PKEY_CTX *ctx, void *data)
      {
      ctx->app_data = data;
      }

void *EVP_PKEY_CTX_get_app_data(EVP_PKEY_CTX *ctx)
      {
      return ctx->app_data;
      }

void EVP_PKEY_meth_set_init(EVP_PKEY_METHOD *pmeth,
      int (*init)(EVP_PKEY_CTX *ctx))
      {
      pmeth->init = init;
      }

void EVP_PKEY_meth_set_copy(EVP_PKEY_METHOD *pmeth,
      int (*copy)(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src))
      {
      pmeth->copy = copy;
      }

void EVP_PKEY_meth_set_cleanup(EVP_PKEY_METHOD *pmeth,
      void (*cleanup)(EVP_PKEY_CTX *ctx))
      {
      pmeth->cleanup = cleanup;
      }

void EVP_PKEY_meth_set_paramgen(EVP_PKEY_METHOD *pmeth,
      int (*paramgen_init)(EVP_PKEY_CTX *ctx),
      int (*paramgen)(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey))
      {
      pmeth->paramgen_init = paramgen_init;
      pmeth->paramgen = paramgen;
      }

void EVP_PKEY_meth_set_keygen(EVP_PKEY_METHOD *pmeth,
      int (*keygen_init)(EVP_PKEY_CTX *ctx),
      int (*keygen)(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey))
      {
      pmeth->keygen_init = keygen_init;
      pmeth->keygen = keygen;
      }

void EVP_PKEY_meth_set_sign(EVP_PKEY_METHOD *pmeth,
      int (*sign_init)(EVP_PKEY_CTX *ctx),
      int (*sign)(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
                              const unsigned char *tbs, size_t tbslen))
      {
      pmeth->sign_init = sign_init;
      pmeth->sign = sign;
      }

void EVP_PKEY_meth_set_verify(EVP_PKEY_METHOD *pmeth,
      int (*verify_init)(EVP_PKEY_CTX *ctx),
      int (*verify)(EVP_PKEY_CTX *ctx, const unsigned char *sig, size_t siglen,
                              const unsigned char *tbs, size_t tbslen))
      {
      pmeth->verify_init = verify_init;
      pmeth->verify = verify;
      }

void EVP_PKEY_meth_set_verify_recover(EVP_PKEY_METHOD *pmeth,
      int (*verify_recover_init)(EVP_PKEY_CTX *ctx),
      int (*verify_recover)(EVP_PKEY_CTX *ctx,
                              unsigned char *sig, size_t *siglen,
                              const unsigned char *tbs, size_t tbslen))
      {
      pmeth->verify_recover_init = verify_recover_init;
      pmeth->verify_recover = verify_recover;
      }

void EVP_PKEY_meth_set_signctx(EVP_PKEY_METHOD *pmeth,
      int (*signctx_init)(EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx),
      int (*signctx)(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
                              EVP_MD_CTX *mctx))
      {
      pmeth->signctx_init = signctx_init;
      pmeth->signctx = signctx;
      }

void EVP_PKEY_meth_set_verifyctx(EVP_PKEY_METHOD *pmeth,
      int (*verifyctx_init)(EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx),
      int (*verifyctx)(EVP_PKEY_CTX *ctx, const unsigned char *sig,int siglen,
                              EVP_MD_CTX *mctx))
      {
      pmeth->verifyctx_init = verifyctx_init;
      pmeth->verifyctx = verifyctx;
      }

void EVP_PKEY_meth_set_encrypt(EVP_PKEY_METHOD *pmeth,
      int (*encrypt_init)(EVP_PKEY_CTX *ctx),
      int (*encryptfn)(EVP_PKEY_CTX *ctx, unsigned char *out, size_t *outlen,
                              const unsigned char *in, size_t inlen))
      {
      pmeth->encrypt_init = encrypt_init;
      pmeth->encrypt = encryptfn;
      }

void EVP_PKEY_meth_set_decrypt(EVP_PKEY_METHOD *pmeth,
      int (*decrypt_init)(EVP_PKEY_CTX *ctx),
      int (*decrypt)(EVP_PKEY_CTX *ctx, unsigned char *out, size_t *outlen,
                              const unsigned char *in, size_t inlen))
      {
      pmeth->decrypt_init = decrypt_init;
      pmeth->decrypt = decrypt;
      }

void EVP_PKEY_meth_set_derive(EVP_PKEY_METHOD *pmeth,
      int (*derive_init)(EVP_PKEY_CTX *ctx),
      int (*derive)(EVP_PKEY_CTX *ctx, unsigned char *key, size_t *keylen))
      {
      pmeth->derive_init = derive_init;
      pmeth->derive = derive;
      }

void EVP_PKEY_meth_set_ctrl(EVP_PKEY_METHOD *pmeth,
      int (*ctrl)(EVP_PKEY_CTX *ctx, int type, int p1, void *p2),
      int (*ctrl_str)(EVP_PKEY_CTX *ctx, const char *type, const char *value))
      {
      pmeth->ctrl = ctrl;
      pmeth->ctrl_str = ctrl_str;
      }

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