crypto/dsa/dsa_gen.c

   1 /*
   2  * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 /*
  11  * DSA low level APIs are deprecated for public use, but still ok for
  12  * internal use.
  13  */
  14 #include "internal/deprecated.h"
  15
  16 #include <openssl/opensslconf.h>
  17 #include <stdio.h>
  18 #include "internal/cryptlib.h"
  19 #include <openssl/evp.h>
  20 #include <openssl/bn.h>
  21 #include <openssl/rand.h>
  22 #include <openssl/sha.h>
  23 #include "crypto/dsa.h"
  24 #include "dsa_local.h"
  25
  26 int dsa_generate_ffc_parameters(DSA *dsa, int type, int pbits, int qbits,
  27                                 BN_GENCB *cb)
  28 {
  29     int ret = 0, res;
  30
  31 #ifndef FIPS_MODULE
  32     if (type == DSA_PARAMGEN_TYPE_FIPS_186_2)
  33         ret = ffc_params_FIPS186_2_generate(dsa->libctx, &dsa->params,
  34                                             FFC_PARAM_TYPE_DSA,
  35                                             pbits, qbits, &res, cb);
  36     else
  37 #endif
  38         ret = ffc_params_FIPS186_4_generate(dsa->libctx, &dsa->params,
  39                                             FFC_PARAM_TYPE_DSA,
  40                                             pbits, qbits, &res, cb);
  41     if (ret > 0)
  42         dsa->dirty_cnt++;
  43     return ret;
  44 }
  45
  46 #ifndef FIPS_MODULE
  47 int DSA_generate_parameters_ex(DSA *dsa, int bits,
  48                                const unsigned char *seed_in, int seed_len,
  49                                int *counter_ret, unsigned long *h_ret,
  50                                BN_GENCB *cb)
  51 {
  52     if (dsa->meth->dsa_paramgen)
  53         return dsa->meth->dsa_paramgen(dsa, bits, seed_in, seed_len,
  54                                        counter_ret, h_ret, cb);
  55     if (seed_in != NULL
  56         && !ffc_params_set_validate_params(&dsa->params, seed_in, seed_len, -1))
  57         return 0;
  58
  59     /* The old code used FIPS 186-2 DSA Parameter generation */
  60     if (bits <= 1024 && seed_len == 20) {
  61         if (!dsa_generate_ffc_parameters(dsa, DSA_PARAMGEN_TYPE_FIPS_186_2,
  62                                          bits, 160, cb))
  63             return 0;
  64     } else {
  65         if (!dsa_generate_ffc_parameters(dsa, DSA_PARAMGEN_TYPE_FIPS_186_4,
  66                                          bits, 0, cb))
  67             return 0;
  68     }
  69
  70     if (counter_ret != NULL)
  71         *counter_ret = dsa->params.pcounter;
  72     if (h_ret != NULL)
  73         *h_ret = dsa->params.h;
  74     return 1;
  75 }
  76 #endif