crypto/dsa/dsa_pmeth.c

   1 /*
   2  * Copyright 2006-2020 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 <stdio.h>
  17 #include "internal/cryptlib.h"
  18 #include <openssl/asn1t.h>
  19 #include <openssl/x509.h>
  20 #include <openssl/evp.h>
  21 #include <openssl/bn.h>
  22 #include "crypto/evp.h"
  23 #include "dsa_local.h"
  24
  25 /* DSA pkey context structure */
  26
  27 typedef struct {
  28     /* Parameter gen parameters */
  29     int nbits;                  /* size of p in bits (default: 2048) */
  30     int qbits;                  /* size of q in bits (default: 224) */
  31     const EVP_MD *pmd;          /* MD for parameter generation */
  32     /* Keygen callback info */
  33     int gentmp[2];
  34     /* message digest */
  35     const EVP_MD *md;           /* MD for the signature */
  36 } DSA_PKEY_CTX;
  37
  38 static int pkey_dsa_init(EVP_PKEY_CTX *ctx)
  39 {
  40     DSA_PKEY_CTX *dctx = OPENSSL_malloc(sizeof(*dctx));
  41
  42     if (dctx == NULL)
  43         return 0;
  44     dctx->nbits = 2048;
  45     dctx->qbits = 224;
  46     dctx->pmd = NULL;
  47     dctx->md = NULL;
  48
  49     ctx->data = dctx;
  50     ctx->keygen_info = dctx->gentmp;
  51     ctx->keygen_info_count = 2;
  52
  53     return 1;
  54 }
  55
  56 static int pkey_dsa_copy(EVP_PKEY_CTX *dst, const EVP_PKEY_CTX *src)
  57 {
  58     DSA_PKEY_CTX *dctx, *sctx;
  59
  60     if (!pkey_dsa_init(dst))
  61         return 0;
  62     sctx = src->data;
  63     dctx = dst->data;
  64     dctx->nbits = sctx->nbits;
  65     dctx->qbits = sctx->qbits;
  66     dctx->pmd = sctx->pmd;
  67     dctx->md = sctx->md;
  68     return 1;
  69 }
  70
  71 static void pkey_dsa_cleanup(EVP_PKEY_CTX *ctx)
  72 {
  73     DSA_PKEY_CTX *dctx = ctx->data;
  74     OPENSSL_free(dctx);
  75 }
  76
  77 static int pkey_dsa_sign(EVP_PKEY_CTX *ctx, unsigned char *sig,
  78                          size_t *siglen, const unsigned char *tbs,
  79                          size_t tbslen)
  80 {
  81     int ret;
  82     unsigned int sltmp;
  83     DSA_PKEY_CTX *dctx = ctx->data;
  84     DSA *dsa = ctx->pkey->pkey.dsa;
  85
  86     if (dctx->md != NULL && tbslen != (size_t)EVP_MD_size(dctx->md))
  87         return 0;
  88
  89     ret = DSA_sign(0, tbs, tbslen, sig, &sltmp, dsa);
  90
  91     if (ret <= 0)
  92         return ret;
  93     *siglen = sltmp;
  94     return 1;
  95 }
  96
  97 static int pkey_dsa_verify(EVP_PKEY_CTX *ctx,
  98                            const unsigned char *sig, size_t siglen,
  99                            const unsigned char *tbs, size_t tbslen)
 100 {
 101     int ret;
 102     DSA_PKEY_CTX *dctx = ctx->data;
 103     DSA *dsa = ctx->pkey->pkey.dsa;
 104
 105     if (dctx->md != NULL && tbslen != (size_t)EVP_MD_size(dctx->md))
 106         return 0;
 107
 108     ret = DSA_verify(0, tbs, tbslen, sig, siglen, dsa);
 109
 110     return ret;
 111 }
 112
 113 static int pkey_dsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
 114 {
 115     DSA_PKEY_CTX *dctx = ctx->data;
 116
 117     switch (type) {
 118     case EVP_PKEY_CTRL_DSA_PARAMGEN_BITS:
 119         if (p1 < 256)
 120             return -2;
 121         dctx->nbits = p1;
 122         return 1;
 123
 124     case EVP_PKEY_CTRL_DSA_PARAMGEN_Q_BITS:
 125         if (p1 != 160 && p1 != 224 && p1 && p1 != 256)
 126             return -2;
 127         dctx->qbits = p1;
 128         return 1;
 129
 130     case EVP_PKEY_CTRL_DSA_PARAMGEN_MD:
 131         if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1 &&
 132             EVP_MD_type((const EVP_MD *)p2) != NID_sha224 &&
 133             EVP_MD_type((const EVP_MD *)p2) != NID_sha256) {
 134             DSAerr(DSA_F_PKEY_DSA_CTRL, DSA_R_INVALID_DIGEST_TYPE);
 135             return 0;
 136         }
 137         dctx->pmd = p2;
 138         return 1;
 139
 140     case EVP_PKEY_CTRL_MD:
 141         if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1 &&
 142             EVP_MD_type((const EVP_MD *)p2) != NID_dsa &&
 143             EVP_MD_type((const EVP_MD *)p2) != NID_dsaWithSHA &&
 144             EVP_MD_type((const EVP_MD *)p2) != NID_sha224 &&
 145             EVP_MD_type((const EVP_MD *)p2) != NID_sha256 &&
 146             EVP_MD_type((const EVP_MD *)p2) != NID_sha384 &&
 147             EVP_MD_type((const EVP_MD *)p2) != NID_sha512 &&
 148             EVP_MD_type((const EVP_MD *)p2) != NID_sha3_224 &&
 149             EVP_MD_type((const EVP_MD *)p2) != NID_sha3_256 &&
 150             EVP_MD_type((const EVP_MD *)p2) != NID_sha3_384 &&
 151             EVP_MD_type((const EVP_MD *)p2) != NID_sha3_512) {
 152             DSAerr(DSA_F_PKEY_DSA_CTRL, DSA_R_INVALID_DIGEST_TYPE);
 153             return 0;
 154         }
 155         dctx->md = p2;
 156         return 1;
 157
 158     case EVP_PKEY_CTRL_GET_MD:
 159         *(const EVP_MD **)p2 = dctx->md;
 160         return 1;
 161
 162     case EVP_PKEY_CTRL_DIGESTINIT:
 163     case EVP_PKEY_CTRL_PKCS7_SIGN:
 164     case EVP_PKEY_CTRL_CMS_SIGN:
 165         return 1;
 166
 167     case EVP_PKEY_CTRL_PEER_KEY:
 168         DSAerr(DSA_F_PKEY_DSA_CTRL,
 169                EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 170         return -2;
 171     default:
 172         return -2;
 173
 174     }
 175 }
 176
 177 static int pkey_dsa_ctrl_str(EVP_PKEY_CTX *ctx,
 178                              const char *type, const char *value)
 179 {
 180     if (strcmp(type, "dsa_paramgen_bits") == 0) {
 181         int nbits;
 182         nbits = atoi(value);
 183         return EVP_PKEY_CTX_set_dsa_paramgen_bits(ctx, nbits);
 184     }
 185     if (strcmp(type, "dsa_paramgen_q_bits") == 0) {
 186         int qbits = atoi(value);
 187         return EVP_PKEY_CTX_set_dsa_paramgen_q_bits(ctx, qbits);
 188     }
 189     if (strcmp(type, "dsa_paramgen_md") == 0) {
 190         const EVP_MD *md = EVP_get_digestbyname(value);
 191
 192         if (md == NULL) {
 193             DSAerr(DSA_F_PKEY_DSA_CTRL_STR, DSA_R_INVALID_DIGEST_TYPE);
 194             return 0;
 195         }
 196         return EVP_PKEY_CTX_set_dsa_paramgen_md(ctx, md);
 197     }
 198     return -2;
 199 }
 200
 201 static int pkey_dsa_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
 202 {
 203     DSA *dsa = NULL;
 204     DSA_PKEY_CTX *dctx = ctx->data;
 205     BN_GENCB *pcb;
 206     int ret, res;
 207
 208     if (ctx->pkey_gencb) {
 209         pcb = BN_GENCB_new();
 210         if (pcb == NULL)
 211             return 0;
 212         evp_pkey_set_cb_translate(pcb, ctx);
 213     } else
 214         pcb = NULL;
 215     dsa = DSA_new();
 216     if (dsa == NULL) {
 217         BN_GENCB_free(pcb);
 218         return 0;
 219     }
 220     if (dctx->md != NULL)
 221         ossl_ffc_set_digest(&dsa->params, EVP_MD_name(dctx->md), NULL);
 222
 223     ret = ossl_ffc_params_FIPS186_4_generate(NULL, &dsa->params,
 224                                              FFC_PARAM_TYPE_DSA, dctx->nbits,
 225                                              dctx->qbits, &res, pcb);
 226     BN_GENCB_free(pcb);
 227     if (ret > 0)
 228         EVP_PKEY_assign_DSA(pkey, dsa);
 229     else
 230         DSA_free(dsa);
 231     return ret;
 232 }
 233
 234 static int pkey_dsa_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
 235 {
 236     DSA *dsa = NULL;
 237
 238     if (ctx->pkey == NULL) {
 239         DSAerr(DSA_F_PKEY_DSA_KEYGEN, DSA_R_NO_PARAMETERS_SET);
 240         return 0;
 241     }
 242     dsa = DSA_new();
 243     if (dsa == NULL)
 244         return 0;
 245     EVP_PKEY_assign_DSA(pkey, dsa);
 246     /* Note: if error return, pkey is freed by parent routine */
 247     if (!EVP_PKEY_copy_parameters(pkey, ctx->pkey))
 248         return 0;
 249     return DSA_generate_key(pkey->pkey.dsa);
 250 }
 251
 252 static const EVP_PKEY_METHOD dsa_pkey_meth = {
 253     EVP_PKEY_DSA,
 254     EVP_PKEY_FLAG_AUTOARGLEN,
 255     pkey_dsa_init,
 256     pkey_dsa_copy,
 257     pkey_dsa_cleanup,
 258
 259     0,
 260     pkey_dsa_paramgen,
 261
 262     0,
 263     pkey_dsa_keygen,
 264
 265     0,
 266     pkey_dsa_sign,
 267
 268     0,
 269     pkey_dsa_verify,
 270
 271     0, 0,
 272
 273     0, 0, 0, 0,
 274
 275     0, 0,
 276
 277     0, 0,
 278
 279     0, 0,
 280
 281     pkey_dsa_ctrl,
 282     pkey_dsa_ctrl_str
 283 };
 284
 285 const EVP_PKEY_METHOD *dsa_pkey_method(void)
 286 {
 287     return &dsa_pkey_meth;
 288 }