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dsa_pmeth.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 "cryptlib.h"
#include <openssl/asn1t.h>
#include <openssl/x509.h>
#include <openssl/evp.h>
#include <openssl/bn.h>
#include "evp_locl.h"
#include "dsa_locl.h"

/* DSA pkey context structure */

00069 typedef struct
      {
      /* Parameter gen parameters */
      int nbits;        /* size of p in bits (default: 1024) */
      int qbits;        /* size of q in bits (default: 160)  */
      const EVP_MD *pmd;      /* MD for parameter generation */
      /* Keygen callback info */
      int gentmp[2];
      /* message digest */
      const EVP_MD *md; /* MD for the signature */
      } DSA_PKEY_CTX;

static int pkey_dsa_init(EVP_PKEY_CTX *ctx)
      {
      DSA_PKEY_CTX *dctx;
      dctx = OPENSSL_malloc(sizeof(DSA_PKEY_CTX));
      if (!dctx)
            return 0;
      dctx->nbits = 1024;
      dctx->qbits = 160;
      dctx->pmd = NULL;
      dctx->md = NULL;

      ctx->data = dctx;
      ctx->keygen_info = dctx->gentmp;
      ctx->keygen_info_count = 2;
      
      return 1;
      }

static int pkey_dsa_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
      {
      DSA_PKEY_CTX *dctx, *sctx;
      if (!pkey_dsa_init(dst))
            return 0;
            sctx = src->data;
      dctx = dst->data;
      dctx->nbits = sctx->nbits;
      dctx->qbits = sctx->qbits;
      dctx->pmd = sctx->pmd;
      dctx->md  = sctx->md;
      return 1;
      }

static void pkey_dsa_cleanup(EVP_PKEY_CTX *ctx)
      {
      DSA_PKEY_CTX *dctx = ctx->data;
      if (dctx)
            OPENSSL_free(dctx);
      }

static int pkey_dsa_sign(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
                              const unsigned char *tbs, size_t tbslen)
      {
      int ret, type;
      unsigned int sltmp;
      DSA_PKEY_CTX *dctx = ctx->data;
      DSA *dsa = ctx->pkey->pkey.dsa;

      if (dctx->md)
            type = EVP_MD_type(dctx->md);
      else
            type = NID_sha1;

      ret = DSA_sign(type, tbs, tbslen, sig, &sltmp, dsa);

      if (ret <= 0)
            return ret;
      *siglen = sltmp;
      return 1;
      }

static int pkey_dsa_verify(EVP_PKEY_CTX *ctx,
                              const unsigned char *sig, size_t siglen,
                              const unsigned char *tbs, size_t tbslen)
      {
      int ret, type;
      DSA_PKEY_CTX *dctx = ctx->data;
      DSA *dsa = ctx->pkey->pkey.dsa;

      if (dctx->md)
            type = EVP_MD_type(dctx->md);
      else
            type = NID_sha1;

      ret = DSA_verify(type, tbs, tbslen, sig, siglen, dsa);

      return ret;
      }

static int pkey_dsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
      {
      DSA_PKEY_CTX *dctx = ctx->data;
      switch (type)
            {
            case EVP_PKEY_CTRL_DSA_PARAMGEN_BITS:
            if (p1 < 256)
                  return -2;
            dctx->nbits = p1;
            return 1;

            case EVP_PKEY_CTRL_DSA_PARAMGEN_Q_BITS:
            if (p1 != 160 && p1 != 224 && p1 && p1 != 256)
                  return -2;
            dctx->qbits = p1;
            return 1;

            case EVP_PKEY_CTRL_DSA_PARAMGEN_MD:
            if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1   &&
                EVP_MD_type((const EVP_MD *)p2) != NID_sha224 &&
                EVP_MD_type((const EVP_MD *)p2) != NID_sha256)
                  {
                  DSAerr(DSA_F_PKEY_DSA_CTRL, DSA_R_INVALID_DIGEST_TYPE);
                  return 0;
                  }
            dctx->md = p2;
            return 1;

            case EVP_PKEY_CTRL_MD:
            if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1   &&
                EVP_MD_type((const EVP_MD *)p2) != NID_dsa    &&
                EVP_MD_type((const EVP_MD *)p2) != NID_sha224 &&
                EVP_MD_type((const EVP_MD *)p2) != NID_sha256)
                  {
                  DSAerr(DSA_F_PKEY_DSA_CTRL, DSA_R_INVALID_DIGEST_TYPE);
                  return 0;
                  }
            dctx->md = p2;
            return 1;

            case EVP_PKEY_CTRL_DIGESTINIT:
            case EVP_PKEY_CTRL_PKCS7_SIGN:
            case EVP_PKEY_CTRL_CMS_SIGN:
            return 1;
            
            case EVP_PKEY_CTRL_PEER_KEY:
                  DSAerr(DSA_F_PKEY_DSA_CTRL,
                  EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
                  return -2;  
            default:
            return -2;

            }
      }
                  
static int pkey_dsa_ctrl_str(EVP_PKEY_CTX *ctx,
                  const char *type, const char *value)
      {
      if (!strcmp(type, "dsa_paramgen_bits"))
            {
            int nbits;
            nbits = atoi(value);
            return EVP_PKEY_CTX_set_dsa_paramgen_bits(ctx, nbits);
            }
      if (!strcmp(type, "dsa_paramgen_q_bits"))
            {
            int qbits = atoi(value);
            return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DSA, EVP_PKEY_OP_PARAMGEN,
                                     EVP_PKEY_CTRL_DSA_PARAMGEN_Q_BITS, qbits, NULL);
            }
      if (!strcmp(type, "dsa_paramgen_md"))
            {
            return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DSA, EVP_PKEY_OP_PARAMGEN,
                                     EVP_PKEY_CTRL_DSA_PARAMGEN_MD, 0, 
                                     (void *)EVP_get_digestbyname(value));
            }
      return -2;
      }

static int pkey_dsa_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
      {
      DSA *dsa = NULL;
      DSA_PKEY_CTX *dctx = ctx->data;
      BN_GENCB *pcb, cb;
      int ret;
      if (ctx->pkey_gencb)
            {
            pcb = &cb;
            evp_pkey_set_cb_translate(pcb, ctx);
            }
      else
            pcb = NULL;
      dsa = DSA_new();
      if (!dsa)
            return 0;
      ret = dsa_builtin_paramgen(dsa, dctx->nbits, dctx->qbits, dctx->pmd,
                                 NULL, 0, NULL, NULL, pcb);
      if (ret)
            EVP_PKEY_assign_DSA(pkey, dsa);
      else
            DSA_free(dsa);
      return ret;
      }

static int pkey_dsa_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
      {
      DSA *dsa = NULL;
      if (ctx->pkey == NULL)
            {
            DSAerr(DSA_F_PKEY_DSA_KEYGEN, DSA_R_NO_PARAMETERS_SET);
            return 0;
            }
      dsa = DSA_new();
      if (!dsa)
            return 0;
      EVP_PKEY_assign_DSA(pkey, dsa);
      /* Note: if error return, pkey is freed by parent routine */
      if (!EVP_PKEY_copy_parameters(pkey, ctx->pkey))
            return 0;
      return DSA_generate_key(pkey->pkey.dsa);
      }

const EVP_PKEY_METHOD dsa_pkey_meth = 
      {
      EVP_PKEY_DSA,
      EVP_PKEY_FLAG_AUTOARGLEN,
      pkey_dsa_init,
      pkey_dsa_copy,
      pkey_dsa_cleanup,

      0,
      pkey_dsa_paramgen,

      0,
      pkey_dsa_keygen,

      0,
      pkey_dsa_sign,

      0,
      pkey_dsa_verify,

      0,0,

      0,0,0,0,

      0,0,

      0,0,

      0,0,

      pkey_dsa_ctrl,
      pkey_dsa_ctrl_str


      };

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