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dsa_ameth.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/x509.h>
#include <openssl/asn1.h>
#include <openssl/dsa.h>
#include <openssl/bn.h>
#ifndef OPENSSL_NO_CMS
#include <openssl/cms.h>
#endif
#include "asn1_locl.h"

static int dsa_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey)
      {
      const unsigned char *p, *pm;
      int pklen, pmlen;
      int ptype;
      void *pval;
      ASN1_STRING *pstr;
      X509_ALGOR *palg;
      ASN1_INTEGER *public_key = NULL;

      DSA *dsa = NULL;

      if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey))
            return 0;
      X509_ALGOR_get0(NULL, &ptype, &pval, palg);


      if (ptype == V_ASN1_SEQUENCE)
            {
            pstr = pval;      
            pm = pstr->data;
            pmlen = pstr->length;

            if (!(dsa = d2i_DSAparams(NULL, &pm, pmlen)))
                  {
                  DSAerr(DSA_F_DSA_PUB_DECODE, DSA_R_DECODE_ERROR);
                  goto err;
                  }

            }
      else if ((ptype == V_ASN1_NULL) || (ptype == V_ASN1_UNDEF))
            {
            if (!(dsa = DSA_new()))
                  {
                  DSAerr(DSA_F_DSA_PUB_DECODE, ERR_R_MALLOC_FAILURE);
                  goto err;
                  }
            }
      else
            {
            DSAerr(DSA_F_DSA_PUB_DECODE, DSA_R_PARAMETER_ENCODING_ERROR);
            goto err;
            }

      if (!(public_key=d2i_ASN1_INTEGER(NULL, &p, pklen)))
            {
            DSAerr(DSA_F_DSA_PUB_DECODE, DSA_R_DECODE_ERROR);
            goto err;
            }

      if (!(dsa->pub_key = ASN1_INTEGER_to_BN(public_key, NULL)))
            {
            DSAerr(DSA_F_DSA_PUB_DECODE, DSA_R_BN_DECODE_ERROR);
            goto err;
            }

      ASN1_INTEGER_free(public_key);
      EVP_PKEY_assign_DSA(pkey, dsa);
      return 1;

      err:
      if (public_key)
            ASN1_INTEGER_free(public_key);
      if (dsa)
            DSA_free(dsa);
      return 0;

      }

static int dsa_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
      {
      DSA *dsa;
      void *pval = NULL;
      int ptype;
      unsigned char *penc = NULL;
      int penclen;

      dsa=pkey->pkey.dsa;
      if (pkey->save_parameters && dsa->p && dsa->q && dsa->g)
            {
            ASN1_STRING *str;
            str = ASN1_STRING_new();
            str->length = i2d_DSAparams(dsa, &str->data);
            if (str->length <= 0)
                  {
                  DSAerr(DSA_F_DSA_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
                  goto err;
                  }
            pval = str;
            ptype = V_ASN1_SEQUENCE;
            }
      else
            ptype = V_ASN1_UNDEF;

      dsa->write_params=0;

      penclen = i2d_DSAPublicKey(dsa, &penc);

      if (penclen <= 0)
            {
            DSAerr(DSA_F_DSA_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
            goto err;
            }

      if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(EVP_PKEY_DSA),
                        ptype, pval, penc, penclen))
            return 1;

      err:
      if (penc)
            OPENSSL_free(penc);
      if (pval)
            ASN1_STRING_free(pval);

      return 0;
      }

/* In PKCS#8 DSA: you just get a private key integer and parameters in the
 * AlgorithmIdentifier the pubkey must be recalculated.
 */
      
static int dsa_priv_decode(EVP_PKEY *pkey, PKCS8_PRIV_KEY_INFO *p8)
      {
      const unsigned char *p, *pm;
      int pklen, pmlen;
      int ptype;
      void *pval;
      ASN1_STRING *pstr;
      X509_ALGOR *palg;
      ASN1_INTEGER *privkey = NULL;
      BN_CTX *ctx = NULL;

      STACK_OF(ASN1_TYPE) *ndsa = NULL;
      DSA *dsa = NULL;

      if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8))
            return 0;
      X509_ALGOR_get0(NULL, &ptype, &pval, palg);

      /* Check for broken DSA PKCS#8, UGH! */
      if (*p == (V_ASN1_SEQUENCE|V_ASN1_CONSTRUCTED))
            {
            ASN1_TYPE *t1, *t2;
            if(!(ndsa = d2i_ASN1_SEQUENCE_ANY(NULL, &p, pklen)))
                  goto decerr;
            if (sk_ASN1_TYPE_num(ndsa) != 2)
                  goto decerr;
            /* Handle Two broken types:
             * SEQUENCE {parameters, priv_key}
             * SEQUENCE {pub_key, priv_key}
             */

            t1 = sk_ASN1_TYPE_value(ndsa, 0);
            t2 = sk_ASN1_TYPE_value(ndsa, 1);
            if (t1->type == V_ASN1_SEQUENCE)
                  {
                  p8->broken = PKCS8_EMBEDDED_PARAM;
                  pval = t1->value.ptr;
                  }
            else if (ptype == V_ASN1_SEQUENCE)
                  p8->broken = PKCS8_NS_DB;
            else
                  goto decerr;

            if (t2->type != V_ASN1_INTEGER)
                  goto decerr;

            privkey = t2->value.integer;
            }
      else
            {
            const unsigned char *q = p;
            if (!(privkey=d2i_ASN1_INTEGER(NULL, &p, pklen)))
                  goto decerr;
            if (privkey->type == V_ASN1_NEG_INTEGER)
                  {
                  p8->broken = PKCS8_NEG_PRIVKEY;
                  ASN1_INTEGER_free(privkey);
                  if (!(privkey=d2i_ASN1_UINTEGER(NULL, &q, pklen)))
                        goto decerr;
                  }
            if (ptype != V_ASN1_SEQUENCE)
                  goto decerr;
            }

      pstr = pval;      
      pm = pstr->data;
      pmlen = pstr->length;
      if (!(dsa = d2i_DSAparams(NULL, &pm, pmlen)))
            goto decerr;
      /* We have parameters now set private key */
      if (!(dsa->priv_key = ASN1_INTEGER_to_BN(privkey, NULL)))
            {
            DSAerr(DSA_F_DSA_PRIV_DECODE,DSA_R_BN_ERROR);
            goto dsaerr;
            }
      /* Calculate public key */
      if (!(dsa->pub_key = BN_new()))
            {
            DSAerr(DSA_F_DSA_PRIV_DECODE, ERR_R_MALLOC_FAILURE);
            goto dsaerr;
            }
      if (!(ctx = BN_CTX_new()))
            {
            DSAerr(DSA_F_DSA_PRIV_DECODE, ERR_R_MALLOC_FAILURE);
            goto dsaerr;
            }
                  
      if (!BN_mod_exp(dsa->pub_key, dsa->g, dsa->priv_key, dsa->p, ctx))
            {
            DSAerr(DSA_F_DSA_PRIV_DECODE,DSA_R_BN_ERROR);
            goto dsaerr;
            }

      EVP_PKEY_assign_DSA(pkey, dsa);
      BN_CTX_free (ctx);
      if(ndsa)
            sk_ASN1_TYPE_pop_free(ndsa, ASN1_TYPE_free);
      else
            ASN1_INTEGER_free(privkey);

      return 1;

      decerr:
      DSAerr(DSA_F_DSA_PRIV_DECODE, EVP_R_DECODE_ERROR);
      dsaerr:
      BN_CTX_free (ctx);
      if (privkey)
            ASN1_INTEGER_free(privkey);
      sk_ASN1_TYPE_pop_free(ndsa, ASN1_TYPE_free);
      DSA_free(dsa);
      return 0;
      }

static int dsa_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
{
      ASN1_STRING *params = NULL;
      ASN1_INTEGER *prkey = NULL;
      unsigned char *dp = NULL;
      int dplen;

      params = ASN1_STRING_new();

      if (!params)
            {
            DSAerr(DSA_F_DSA_PRIV_ENCODE,ERR_R_MALLOC_FAILURE);
            goto err;
            }

      params->length = i2d_DSAparams(pkey->pkey.dsa, &params->data);
      if (params->length <= 0)
            {
            DSAerr(DSA_F_DSA_PRIV_ENCODE,ERR_R_MALLOC_FAILURE);
            goto err;
            }
      params->type = V_ASN1_SEQUENCE;

      /* Get private key into integer */
      prkey = BN_to_ASN1_INTEGER(pkey->pkey.dsa->priv_key, NULL);

      if (!prkey)
            {
            DSAerr(DSA_F_DSA_PRIV_ENCODE,DSA_R_BN_ERROR);
            goto err;
            }

      dplen = i2d_ASN1_INTEGER(prkey, &dp);

      ASN1_INTEGER_free(prkey);

      if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_dsa), 0,
                        V_ASN1_SEQUENCE, params, dp, dplen))
            goto err;

      return 1;

err:
      if (dp != NULL)
            OPENSSL_free(dp);
      if (params != NULL)
            ASN1_STRING_free(params);
      if (prkey != NULL)
            ASN1_INTEGER_free(prkey);
      return 0;
}

static int int_dsa_size(const EVP_PKEY *pkey)
      {
      return(DSA_size(pkey->pkey.dsa));
      }

static int dsa_bits(const EVP_PKEY *pkey)
      {
      return BN_num_bits(pkey->pkey.dsa->p);
      }

static int dsa_missing_parameters(const EVP_PKEY *pkey)
      {
      DSA *dsa;
      dsa=pkey->pkey.dsa;
      if ((dsa->p == NULL) || (dsa->q == NULL) || (dsa->g == NULL))
                  return 1;
      return 0;
      }

static int dsa_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
      {
      BIGNUM *a;

      if ((a=BN_dup(from->pkey.dsa->p)) == NULL)
            return 0;
      if (to->pkey.dsa->p != NULL)
            BN_free(to->pkey.dsa->p);
      to->pkey.dsa->p=a;

      if ((a=BN_dup(from->pkey.dsa->q)) == NULL)
            return 0;
      if (to->pkey.dsa->q != NULL)
            BN_free(to->pkey.dsa->q);
      to->pkey.dsa->q=a;

      if ((a=BN_dup(from->pkey.dsa->g)) == NULL)
            return 0;
      if (to->pkey.dsa->g != NULL)
            BN_free(to->pkey.dsa->g);
      to->pkey.dsa->g=a;
      return 1;
      }

static int dsa_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
      {
      if (  BN_cmp(a->pkey.dsa->p,b->pkey.dsa->p) ||
            BN_cmp(a->pkey.dsa->q,b->pkey.dsa->q) ||
            BN_cmp(a->pkey.dsa->g,b->pkey.dsa->g))
            return 0;
      else
            return 1;
      }

static int dsa_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
      {
      if (BN_cmp(b->pkey.dsa->pub_key,a->pkey.dsa->pub_key) != 0)
            return 0;
      else
            return 1;
      }

static void int_dsa_free(EVP_PKEY *pkey)
      {
      DSA_free(pkey->pkey.dsa);
      }

static void update_buflen(const BIGNUM *b, size_t *pbuflen)
      {
      size_t i;
      if (!b)
            return;
      if (*pbuflen < (i = (size_t)BN_num_bytes(b)))
                  *pbuflen = i;
      }

static int do_dsa_print(BIO *bp, const DSA *x, int off, int ptype)
      {
      unsigned char *m=NULL;
      int ret=0;
      size_t buf_len=0;
      const char *ktype = NULL;

      const BIGNUM *priv_key, *pub_key;

      if (ptype == 2)
            priv_key = x->priv_key;
      else
            priv_key = NULL;

      if (ptype > 0)
            pub_key = x->pub_key;
      else
            pub_key = NULL;

      if (ptype == 2)
            ktype = "Private-Key";
      else if (ptype == 1)
            ktype = "Public-Key";
      else
            ktype = "DSA-Parameters";

      update_buflen(x->p, &buf_len);
      update_buflen(x->q, &buf_len);
      update_buflen(x->g, &buf_len);
      update_buflen(priv_key, &buf_len);
      update_buflen(pub_key, &buf_len);

      m=(unsigned char *)OPENSSL_malloc(buf_len+10);
      if (m == NULL)
            {
            DSAerr(DSA_F_DO_DSA_PRINT,ERR_R_MALLOC_FAILURE);
            goto err;
            }

      if (priv_key)
            {
            if(!BIO_indent(bp,off,128))
               goto err;
            if (BIO_printf(bp,"%s: (%d bit)\n",ktype, BN_num_bits(x->p))
                  <= 0) goto err;
            }

      if (!ASN1_bn_print(bp,"priv:",priv_key,m,off))
            goto err;
      if (!ASN1_bn_print(bp,"pub: ",pub_key,m,off))
            goto err;
      if (!ASN1_bn_print(bp,"P:   ",x->p,m,off)) goto err;
      if (!ASN1_bn_print(bp,"Q:   ",x->q,m,off)) goto err;
      if (!ASN1_bn_print(bp,"G:   ",x->g,m,off)) goto err;
      ret=1;
err:
      if (m != NULL) OPENSSL_free(m);
      return(ret);
      }

static int dsa_param_decode(EVP_PKEY *pkey,
                              const unsigned char **pder, int derlen)
      {
      DSA *dsa;
      if (!(dsa = d2i_DSAparams(NULL, pder, derlen)))
            {
            DSAerr(DSA_F_DSA_PARAM_DECODE, ERR_R_DSA_LIB);
            return 0;
            }
      EVP_PKEY_assign_DSA(pkey, dsa);
      return 1;
      }

static int dsa_param_encode(const EVP_PKEY *pkey, unsigned char **pder)
      {
      return i2d_DSAparams(pkey->pkey.dsa, pder);
      }

static int dsa_param_print(BIO *bp, const EVP_PKEY *pkey, int indent,
                                          ASN1_PCTX *ctx)
      {
      return do_dsa_print(bp, pkey->pkey.dsa, indent, 0);
      }

static int dsa_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent,
                                          ASN1_PCTX *ctx)
      {
      return do_dsa_print(bp, pkey->pkey.dsa, indent, 1);
      }


static int dsa_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent,
                                          ASN1_PCTX *ctx)
      {
      return do_dsa_print(bp, pkey->pkey.dsa, indent, 2);
      }

static int old_dsa_priv_decode(EVP_PKEY *pkey,
                              const unsigned char **pder, int derlen)
      {
      DSA *dsa;
      if (!(dsa = d2i_DSAPrivateKey (NULL, pder, derlen)))
            {
            DSAerr(DSA_F_OLD_DSA_PRIV_DECODE, ERR_R_DSA_LIB);
            return 0;
            }
      EVP_PKEY_assign_DSA(pkey, dsa);
      return 1;
      }

static int old_dsa_priv_encode(const EVP_PKEY *pkey, unsigned char **pder)
      {
      return i2d_DSAPrivateKey(pkey->pkey.dsa, pder);
      }

static int dsa_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
      {
      switch (op)
            {
            case ASN1_PKEY_CTRL_PKCS7_SIGN:
            if (arg1 == 0)
                  {
                  int snid, hnid;
                  X509_ALGOR *alg1, *alg2;
                  PKCS7_SIGNER_INFO_get0_algs(arg2, NULL, &alg1, &alg2);
                  if (alg1 == NULL || alg1->algorithm == NULL)
                        return -1;
                  hnid = OBJ_obj2nid(alg1->algorithm);
                  if (hnid == NID_undef)
                        return -1;
                  if (!OBJ_find_sigid_by_algs(&snid, hnid, EVP_PKEY_id(pkey)))
                        return -1; 
                  X509_ALGOR_set0(alg2, OBJ_nid2obj(snid), V_ASN1_UNDEF, 0);
                  }
            return 1;
#ifndef OPENSSL_NO_CMS
            case ASN1_PKEY_CTRL_CMS_SIGN:
            if (arg1 == 0)
                  {
                  int snid, hnid;
                  X509_ALGOR *alg1, *alg2;
                  CMS_SignerInfo_get0_algs(arg2, NULL, NULL, &alg1, &alg2);
                  if (alg1 == NULL || alg1->algorithm == NULL)
                        return -1;
                  hnid = OBJ_obj2nid(alg1->algorithm);
                  if (hnid == NID_undef)
                        return -1;
                  if (!OBJ_find_sigid_by_algs(&snid, hnid, EVP_PKEY_id(pkey)))
                        return -1; 
                  X509_ALGOR_set0(alg2, OBJ_nid2obj(snid), V_ASN1_UNDEF, 0);
                  }
            return 1;
#endif

            case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
            *(int *)arg2 = NID_sha1;
            return 2;

            default:
            return -2;

            }

      }

/* NB these are sorted in pkey_id order, lowest first */

const EVP_PKEY_ASN1_METHOD dsa_asn1_meths[] = 
      {

            {
            EVP_PKEY_DSA2,
            EVP_PKEY_DSA,
            ASN1_PKEY_ALIAS
            },

            {
            EVP_PKEY_DSA1,
            EVP_PKEY_DSA,
            ASN1_PKEY_ALIAS
            },

            {
            EVP_PKEY_DSA4,
            EVP_PKEY_DSA,
            ASN1_PKEY_ALIAS
            },

            {
            EVP_PKEY_DSA3,
            EVP_PKEY_DSA,
            ASN1_PKEY_ALIAS
            },

            {
            EVP_PKEY_DSA,
            EVP_PKEY_DSA,
            0,

            "DSA",
            "OpenSSL DSA method",

            dsa_pub_decode,
            dsa_pub_encode,
            dsa_pub_cmp,
            dsa_pub_print,

            dsa_priv_decode,
            dsa_priv_encode,
            dsa_priv_print,

            int_dsa_size,
            dsa_bits,

            dsa_param_decode,
            dsa_param_encode,
            dsa_missing_parameters,
            dsa_copy_parameters,
            dsa_cmp_parameters,
            dsa_param_print,

            int_dsa_free,
            dsa_pkey_ctrl,
            old_dsa_priv_decode,
            old_dsa_priv_encode
            }
      };


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