text: /* $OpenBSD: pmeth_fn.c,v 1.4 2014/07/11 08:44:48 jsing Exp $ */
  /* 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 <openssl/err.h>
  #include <openssl/evp.h>
  #include <openssl/objects.h>
  
  #include "evp_locl.h"
  
  #define M_check_autoarg(ctx, arg, arglen, err) \
  	if (ctx->pmeth->flags & EVP_PKEY_FLAG_AUTOARGLEN) \
  		{ \
  		size_t pksize = (size_t)EVP_PKEY_size(ctx->pkey); \
  		if (!arg) \
  			{ \
  			*arglen = pksize; \
  			return 1; \
  			} \
  		else if (*arglen < pksize) \
  			{ \
  			EVPerr(err, EVP_R_BUFFER_TOO_SMALL); /*ckerr_ignore*/\
  			return 0; \
  			} \
  		}
  
  int
  EVP_PKEY_sign_init(EVP_PKEY_CTX *ctx)
  {
  	int ret;
  
  	if (!ctx || !ctx->pmeth || !ctx->pmeth->sign) {
  		EVPerr(EVP_F_EVP_PKEY_SIGN_INIT,
  		    EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
  		return -2;
  	}
  	ctx->operation = EVP_PKEY_OP_SIGN;
  	if (!ctx->pmeth->sign_init)
  		return 1;
  	ret = ctx->pmeth->sign_init(ctx);
  	if (ret <= 0)
  		ctx->operation = EVP_PKEY_OP_UNDEFINED;
  	return ret;
  }
  
  int
  EVP_PKEY_sign(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
      const unsigned char *tbs, size_t tbslen)
  {
  	if (!ctx || !ctx->pmeth || !ctx->pmeth->sign) {
  		EVPerr(EVP_F_EVP_PKEY_SIGN,
  		    EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
  		return -2;
  	}
  	if (ctx->operation != EVP_PKEY_OP_SIGN) {
  		EVPerr(EVP_F_EVP_PKEY_SIGN, EVP_R_OPERATON_NOT_INITIALIZED);
  		return -1;
  	}
  	M_check_autoarg(ctx, sig, siglen, EVP_F_EVP_PKEY_SIGN)
  	return ctx->pmeth->sign(ctx, sig, siglen, tbs, tbslen);
  }
  
  int
  EVP_PKEY_verify_init(EVP_PKEY_CTX *ctx)
  {
  	int ret;
  
  	if (!ctx || !ctx->pmeth || !ctx->pmeth->verify) {
  		EVPerr(EVP_F_EVP_PKEY_VERIFY_INIT,
  		    EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
  		return -2;
  	}
  	ctx->operation = EVP_PKEY_OP_VERIFY;
  	if (!ctx->pmeth->verify_init)
  		return 1;
  	ret = ctx->pmeth->verify_init(ctx);
  	if (ret <= 0)
  		ctx->operation = EVP_PKEY_OP_UNDEFINED;
  	return ret;
  }
  
  int
  EVP_PKEY_verify(EVP_PKEY_CTX *ctx, const unsigned char *sig, size_t siglen,
      const unsigned char *tbs, size_t tbslen)
  {
  	if (!ctx || !ctx->pmeth || !ctx->pmeth->verify) {
  		EVPerr(EVP_F_EVP_PKEY_VERIFY,
  		    EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
  		return -2;
  	}
  	if (ctx->operation != EVP_PKEY_OP_VERIFY) {
  		EVPerr(EVP_F_EVP_PKEY_VERIFY, EVP_R_OPERATON_NOT_INITIALIZED);
  		return -1;
  	}
  	return ctx->pmeth->verify(ctx, sig, siglen, tbs, tbslen);
  }
  
  int
  EVP_PKEY_verify_recover_init(EVP_PKEY_CTX *ctx)
  {
  	int ret;
  
  	if (!ctx || !ctx->pmeth || !ctx->pmeth->verify_recover) {
  		EVPerr(EVP_F_EVP_PKEY_VERIFY_RECOVER_INIT,
  		    EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
  		return -2;
  	}
  	ctx->operation = EVP_PKEY_OP_VERIFYRECOVER;
  	if (!ctx->pmeth->verify_recover_init)
  		return 1;
  	ret = ctx->pmeth->verify_recover_init(ctx);
  	if (ret <= 0)
  		ctx->operation = EVP_PKEY_OP_UNDEFINED;
  	return ret;
  }
  
  int
  EVP_PKEY_verify_recover(EVP_PKEY_CTX *ctx, unsigned char *rout, size_t *routlen,
      const unsigned char *sig, size_t siglen)
  {
  	if (!ctx || !ctx->pmeth || !ctx->pmeth->verify_recover) {
  		EVPerr(EVP_F_EVP_PKEY_VERIFY_RECOVER,
  		    EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
  		return -2;
  	}
  	if (ctx->operation != EVP_PKEY_OP_VERIFYRECOVER) {
  		EVPerr(EVP_F_EVP_PKEY_VERIFY_RECOVER,
  		    EVP_R_OPERATON_NOT_INITIALIZED);
  		return -1;
  	}
  	M_check_autoarg(ctx, rout, routlen, EVP_F_EVP_PKEY_VERIFY_RECOVER)
  	return ctx->pmeth->verify_recover(ctx, rout, routlen, sig, siglen);
  }
  
  int
  EVP_PKEY_encrypt_init(EVP_PKEY_CTX *ctx)
  {
  	int ret;
  
  	if (!ctx || !ctx->pmeth || !ctx->pmeth->encrypt) {
  		EVPerr(EVP_F_EVP_PKEY_ENCRYPT_INIT,
  		    EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
  		return -2;
  	}
  	ctx->operation = EVP_PKEY_OP_ENCRYPT;
  	if (!ctx->pmeth->encrypt_init)
  		return 1;
  	ret = ctx->pmeth->encrypt_init(ctx);
  	if (ret <= 0)
  		ctx->operation = EVP_PKEY_OP_UNDEFINED;
  	return ret;
  }
  
  int
  EVP_PKEY_encrypt(EVP_PKEY_CTX *ctx, unsigned char *out, size_t *outlen,
      const unsigned char *in, size_t inlen)
  {
  	if (!ctx || !ctx->pmeth || !ctx->pmeth->encrypt) {
  		EVPerr(EVP_F_EVP_PKEY_ENCRYPT,
  		    EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
  		return -2;
  	}
  	if (ctx->operation != EVP_PKEY_OP_ENCRYPT) {
  		EVPerr(EVP_F_EVP_PKEY_ENCRYPT, EVP_R_OPERATON_NOT_INITIALIZED);
  		return -1;
  	}
  	M_check_autoarg(ctx, out, outlen, EVP_F_EVP_PKEY_ENCRYPT)
  	return ctx->pmeth->encrypt(ctx, out, outlen, in, inlen);
  }
  
  int
  EVP_PKEY_decrypt_init(EVP_PKEY_CTX *ctx)
  {
  	int ret;
  
  	if (!ctx || !ctx->pmeth || !ctx->pmeth->decrypt) {
  		EVPerr(EVP_F_EVP_PKEY_DECRYPT_INIT,
  		    EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
  		return -2;
  	}
  	ctx->operation = EVP_PKEY_OP_DECRYPT;
  	if (!ctx->pmeth->decrypt_init)
  		return 1;
  	ret = ctx->pmeth->decrypt_init(ctx);
  	if (ret <= 0)
  		ctx->operation = EVP_PKEY_OP_UNDEFINED;
  	return ret;
  }
  
  int
  EVP_PKEY_decrypt(EVP_PKEY_CTX *ctx, unsigned char *out, size_t *outlen,
      const unsigned char *in, size_t inlen)
  {
  	if (!ctx || !ctx->pmeth || !ctx->pmeth->decrypt) {
  		EVPerr(EVP_F_EVP_PKEY_DECRYPT,
  		    EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
  		return -2;
  	}
  	if (ctx->operation != EVP_PKEY_OP_DECRYPT) {
  		EVPerr(EVP_F_EVP_PKEY_DECRYPT, EVP_R_OPERATON_NOT_INITIALIZED);
  		return -1;
  	}
  	M_check_autoarg(ctx, out, outlen, EVP_F_EVP_PKEY_DECRYPT)
  	return ctx->pmeth->decrypt(ctx, out, outlen, in, inlen);
  }
  
  int
  EVP_PKEY_derive_init(EVP_PKEY_CTX *ctx)
  {
  	int ret;
  
  	if (!ctx || !ctx->pmeth || !ctx->pmeth->derive) {
  		EVPerr(EVP_F_EVP_PKEY_DERIVE_INIT,
  		    EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
  		return -2;
  	}
  	ctx->operation = EVP_PKEY_OP_DERIVE;
  	if (!ctx->pmeth->derive_init)
  		return 1;
  	ret = ctx->pmeth->derive_init(ctx);
  	if (ret <= 0)
  		ctx->operation = EVP_PKEY_OP_UNDEFINED;
  	return ret;
  }
  
  int
  EVP_PKEY_derive_set_peer(EVP_PKEY_CTX *ctx, EVP_PKEY *peer)
  {
  	int ret;
  
  	if (!ctx || !ctx->pmeth || !(ctx->pmeth->derive ||
  	    ctx->pmeth->encrypt || ctx->pmeth->decrypt) ||
  	    !ctx->pmeth->ctrl) {
  		EVPerr(EVP_F_EVP_PKEY_DERIVE_SET_PEER,
  		    EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
  		return -2;
  	}
  	if (ctx->operation != EVP_PKEY_OP_DERIVE &&
  	    ctx->operation != EVP_PKEY_OP_ENCRYPT &&
  	    ctx->operation != EVP_PKEY_OP_DECRYPT) {
  		EVPerr(EVP_F_EVP_PKEY_DERIVE_SET_PEER,
  		    EVP_R_OPERATON_NOT_INITIALIZED);
  		return -1;
  	}
  
  	ret = ctx->pmeth->ctrl(ctx, EVP_PKEY_CTRL_PEER_KEY, 0, peer);
  
  	if (ret <= 0)
  		return ret;
  
  	if (ret == 2)
  		return 1;
  
  	if (!ctx->pkey) {
  		EVPerr(EVP_F_EVP_PKEY_DERIVE_SET_PEER, EVP_R_NO_KEY_SET);
  		return -1;
  	}
  
  	if (ctx->pkey->type != peer->type) {
  		EVPerr(EVP_F_EVP_PKEY_DERIVE_SET_PEER,
  		    EVP_R_DIFFERENT_KEY_TYPES);
  		return -1;
  	}
  
  	/* ran@cryptocom.ru: For clarity.  The error is if parameters in peer are
  	 * present (!missing) but don't match.  EVP_PKEY_cmp_parameters may return
  	 * 1 (match), 0 (don't match) and -2 (comparison is not defined).  -1
  	 * (different key types) is impossible here because it is checked earlier.
  	 * -2 is OK for us here, as well as 1, so we can check for 0 only. */
  	if (!EVP_PKEY_missing_parameters(peer) &&
  	    !EVP_PKEY_cmp_parameters(ctx->pkey, peer)) {
  		EVPerr(EVP_F_EVP_PKEY_DERIVE_SET_PEER,
  		    EVP_R_DIFFERENT_PARAMETERS);
  		return -1;
  	}
  
  	EVP_PKEY_free(ctx->peerkey);
  	ctx->peerkey = peer;
  
  	ret = ctx->pmeth->ctrl(ctx, EVP_PKEY_CTRL_PEER_KEY, 1, peer);
  
  	if (ret <= 0) {
  		ctx->peerkey = NULL;
  		return ret;
  	}
  
  	CRYPTO_add(&peer->references, 1, CRYPTO_LOCK_EVP_PKEY);
  	return 1;
  }
  
  int
  EVP_PKEY_derive(EVP_PKEY_CTX *ctx, unsigned char *key, size_t *pkeylen)
  {
  	if (!ctx || !ctx->pmeth || !ctx->pmeth->derive) {
  		EVPerr(EVP_F_EVP_PKEY_DERIVE,
  		    EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
  		return -2;
  	}
  	if (ctx->operation != EVP_PKEY_OP_DERIVE) {
  		EVPerr(EVP_F_EVP_PKEY_DERIVE, EVP_R_OPERATON_NOT_INITIALIZED);
  		return -1;
  	}
  	M_check_autoarg(ctx, key, pkeylen, EVP_F_EVP_PKEY_DERIVE)
  	return ctx->pmeth->derive(ctx, key, pkeylen);
  }
  