crypto/dsa/dsa_pmeth.c

   1 /*
   2  * Copyright 2006-2018 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 #include <stdio.h>
  11 #include "internal/cryptlib.h"
  12 #include <openssl/asn1t.h>
  13 #include <openssl/x509.h>
  14 #include <openssl/evp.h>
  15 #include <openssl/bn.h>
  16 #include "internal/evp_int.h"
  17 #include "dsa_locl.h"
  18
  19 /* DSA pkey context structure */
  20
  21 typedef struct {
  22     /* Parameter gen parameters */
  23     int nbits;                  /* size of p in bits (default: 1024) */
  24     int qbits;                  /* size of q in bits (default: 160) */
  25     const EVP_MD *pmd;          /* MD for parameter generation */
  26     /* Keygen callback info */
  27     int gentmp[2];
  28     /* message digest */
  29     const EVP_MD *md;           /* MD for the signature */
  30 } DSA_PKEY_CTX;
  31
  32 static int pkey_dsa_init(EVP_PKEY_CTX *ctx)
  33 {
  34     DSA_PKEY_CTX *dctx = OPENSSL_malloc(sizeof(*dctx));
  35
  36     if (dctx == NULL)
  37         return 0;
  38     dctx->nbits = 1024;
  39     dctx->qbits = 160;
  40     dctx->pmd = NULL;
  41     dctx->md = NULL;
  42
  43     ctx->data = dctx;
  44     ctx->keygen_info = dctx->gentmp;
  45     ctx->keygen_info_count = 2;
  46
  47     return 1;
  48 }
  49
  50 static int pkey_dsa_copy(EVP_PKEY_CTX *dst, const EVP_PKEY_CTX *src)
  51 {
  52     DSA_PKEY_CTX *dctx, *sctx;
  53
  54     if (!pkey_dsa_init(dst))
  55         return 0;
  56     sctx = src->data;
  57     dctx = dst->data;
  58     dctx->nbits = sctx->nbits;
  59     dctx->qbits = sctx->qbits;
  60     dctx->pmd = sctx->pmd;
  61     dctx->md = sctx->md;
  62     return 1;
  63 }
  64
  65 static void pkey_dsa_cleanup(EVP_PKEY_CTX *ctx)
  66 {
  67     DSA_PKEY_CTX *dctx = ctx->data;
  68     OPENSSL_free(dctx);
  69 }
  70
  71 static int pkey_dsa_sign(EVP_PKEY_CTX *ctx, unsigned char *sig,
  72                          size_t *siglen, const unsigned char *tbs,
  73                          size_t tbslen)
  74 {
  75     int ret;
  76     unsigned int sltmp;
  77     DSA_PKEY_CTX *dctx = ctx->data;
  78     DSA *dsa = ctx->pkey->pkey.dsa;
  79
  80     if (dctx->md != NULL && tbslen != (size_t)EVP_MD_size(dctx->md))
  81         return 0;
  82
  83     ret = DSA_sign(0, tbs, tbslen, sig, &sltmp, dsa);
  84
  85     if (ret <= 0)
  86         return ret;
  87     *siglen = sltmp;
  88     return 1;
  89 }
  90
  91 static int pkey_dsa_verify(EVP_PKEY_CTX *ctx,
  92                            const unsigned char *sig, size_t siglen,
  93                            const unsigned char *tbs, size_t tbslen)
  94 {
  95     int ret;
  96     DSA_PKEY_CTX *dctx = ctx->data;
  97     DSA *dsa = ctx->pkey->pkey.dsa;
  98
  99     if (dctx->md != NULL && tbslen != (size_t)EVP_MD_size(dctx->md))
 100         return 0;
 101
 102     ret = DSA_verify(0, tbs, tbslen, sig, siglen, dsa);
 103
 104     return ret;
 105 }
 106
 107 static int pkey_dsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
 108 {
 109     DSA_PKEY_CTX *dctx = ctx->data;
 110
 111     switch (type) {
 112     case EVP_PKEY_CTRL_DSA_PARAMGEN_BITS:
 113         if (p1 < 256)
 114             return -2;
 115         dctx->nbits = p1;
 116         return 1;
 117
 118     case EVP_PKEY_CTRL_DSA_PARAMGEN_Q_BITS:
 119         if (p1 != 160 && p1 != 224 && p1 && p1 != 256)
 120             return -2;
 121         dctx->qbits = p1;
 122         return 1;
 123
 124     case EVP_PKEY_CTRL_DSA_PARAMGEN_MD:
 125         if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1 &&
 126             EVP_MD_type((const EVP_MD *)p2) != NID_sha224 &&
 127             EVP_MD_type((const EVP_MD *)p2) != NID_sha256) {
 128             DSAerr(DSA_F_PKEY_DSA_CTRL, DSA_R_INVALID_DIGEST_TYPE);
 129             return 0;
 130         }
 131         dctx->pmd = p2;
 132         return 1;
 133
 134     case EVP_PKEY_CTRL_MD:
 135         if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1 &&
 136             EVP_MD_type((const EVP_MD *)p2) != NID_dsa &&
 137             EVP_MD_type((const EVP_MD *)p2) != NID_dsaWithSHA &&
 138             EVP_MD_type((const EVP_MD *)p2) != NID_sha224 &&
 139             EVP_MD_type((const EVP_MD *)p2) != NID_sha256 &&
 140             EVP_MD_type((const EVP_MD *)p2) != NID_sha384 &&
 141             EVP_MD_type((const EVP_MD *)p2) != NID_sha512) {
 142             DSAerr(DSA_F_PKEY_DSA_CTRL, DSA_R_INVALID_DIGEST_TYPE);
 143             return 0;
 144         }
 145         dctx->md = p2;
 146         return 1;
 147
 148     case EVP_PKEY_CTRL_GET_MD:
 149         *(const EVP_MD **)p2 = dctx->md;
 150         return 1;
 151
 152     case EVP_PKEY_CTRL_DIGESTINIT:
 153     case EVP_PKEY_CTRL_PKCS7_SIGN:
 154     case EVP_PKEY_CTRL_CMS_SIGN:
 155         return 1;
 156
 157     case EVP_PKEY_CTRL_PEER_KEY:
 158         DSAerr(DSA_F_PKEY_DSA_CTRL,
 159                EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 160         return -2;
 161     default:
 162         return -2;
 163
 164     }
 165 }
 166
 167 static int pkey_dsa_ctrl_str(EVP_PKEY_CTX *ctx,
 168                              const char *type, const char *value)
 169 {
 170     if (strcmp(type, "dsa_paramgen_bits") == 0) {
 171         int nbits;
 172         nbits = atoi(value);
 173         return EVP_PKEY_CTX_set_dsa_paramgen_bits(ctx, nbits);
 174     }
 175     if (strcmp(type, "dsa_paramgen_q_bits") == 0) {
 176         int qbits = atoi(value);
 177         return EVP_PKEY_CTX_set_dsa_paramgen_q_bits(ctx, qbits);
 178     }
 179     if (strcmp(type, "dsa_paramgen_md") == 0) {
 180         const EVP_MD *md = EVP_get_digestbyname(value);
 181
 182         if (md == NULL) {
 183             DSAerr(DSA_F_PKEY_DSA_CTRL_STR, DSA_R_INVALID_DIGEST_TYPE);
 184             return 0;
 185         }
 186         return EVP_PKEY_CTX_set_dsa_paramgen_md(ctx, md);
 187     }
 188     return -2;
 189 }
 190
 191 static int pkey_dsa_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
 192 {
 193     DSA *dsa = NULL;
 194     DSA_PKEY_CTX *dctx = ctx->data;
 195     BN_GENCB *pcb;
 196     int ret;
 197
 198     if (ctx->pkey_gencb) {
 199         pcb = BN_GENCB_new();
 200         if (pcb == NULL)
 201             return 0;
 202         evp_pkey_set_cb_translate(pcb, ctx);
 203     } else
 204         pcb = NULL;
 205     dsa = DSA_new();
 206     if (dsa == NULL) {
 207         BN_GENCB_free(pcb);
 208         return 0;
 209     }
 210     ret = dsa_builtin_paramgen(dsa, dctx->nbits, dctx->qbits, dctx->pmd,
 211                                NULL, 0, NULL, NULL, NULL, pcb);
 212     BN_GENCB_free(pcb);
 213     if (ret)
 214         EVP_PKEY_assign_DSA(pkey, dsa);
 215     else
 216         DSA_free(dsa);
 217     return ret;
 218 }
 219
 220 static int pkey_dsa_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
 221 {
 222     DSA *dsa = NULL;
 223
 224     if (ctx->pkey == NULL) {
 225         DSAerr(DSA_F_PKEY_DSA_KEYGEN, DSA_R_NO_PARAMETERS_SET);
 226         return 0;
 227     }
 228     dsa = DSA_new();
 229     if (dsa == NULL)
 230         return 0;
 231     EVP_PKEY_assign_DSA(pkey, dsa);
 232     /* Note: if error return, pkey is freed by parent routine */
 233     if (!EVP_PKEY_copy_parameters(pkey, ctx->pkey))
 234         return 0;
 235     return DSA_generate_key(pkey->pkey.dsa);
 236 }
 237
 238 const EVP_PKEY_METHOD dsa_pkey_meth = {
 239     EVP_PKEY_DSA,
 240     EVP_PKEY_FLAG_AUTOARGLEN,
 241     pkey_dsa_init,
 242     pkey_dsa_copy,
 243     pkey_dsa_cleanup,
 244
 245     0,
 246     pkey_dsa_paramgen,
 247
 248     0,
 249     pkey_dsa_keygen,
 250
 251     0,
 252     pkey_dsa_sign,
 253
 254     0,
 255     pkey_dsa_verify,
 256
 257     0, 0,
 258
 259     0, 0, 0, 0,
 260
 261     0, 0,
 262
 263     0, 0,
 264
 265     0, 0,
 266
 267     pkey_dsa_ctrl,
 268     pkey_dsa_ctrl_str
 269 };