2 * Copyright 2006-2020 The OpenSSL Project Authors. All Rights Reserved.
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
11 * DSA low level APIs are deprecated for public use, but still ok for
14 #include "internal/deprecated.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"
25 /* DSA pkey context structure */
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 */
35 const EVP_MD *md; /* MD for the signature */
38 static int pkey_dsa_init(EVP_PKEY_CTX *ctx)
40 DSA_PKEY_CTX *dctx = OPENSSL_malloc(sizeof(*dctx));
50 ctx->keygen_info = dctx->gentmp;
51 ctx->keygen_info_count = 2;
56 static int pkey_dsa_copy(EVP_PKEY_CTX *dst, const EVP_PKEY_CTX *src)
58 DSA_PKEY_CTX *dctx, *sctx;
60 if (!pkey_dsa_init(dst))
64 dctx->nbits = sctx->nbits;
65 dctx->qbits = sctx->qbits;
66 dctx->pmd = sctx->pmd;
71 static void pkey_dsa_cleanup(EVP_PKEY_CTX *ctx)
73 DSA_PKEY_CTX *dctx = ctx->data;
77 static int pkey_dsa_sign(EVP_PKEY_CTX *ctx, unsigned char *sig,
78 size_t *siglen, const unsigned char *tbs,
83 DSA_PKEY_CTX *dctx = ctx->data;
84 DSA *dsa = ctx->pkey->pkey.dsa;
86 if (dctx->md != NULL && tbslen != (size_t)EVP_MD_size(dctx->md))
89 ret = DSA_sign(0, tbs, tbslen, sig, &sltmp, dsa);
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)
102 DSA_PKEY_CTX *dctx = ctx->data;
103 DSA *dsa = ctx->pkey->pkey.dsa;
105 if (dctx->md != NULL && tbslen != (size_t)EVP_MD_size(dctx->md))
108 ret = DSA_verify(0, tbs, tbslen, sig, siglen, dsa);
113 static int pkey_dsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
115 DSA_PKEY_CTX *dctx = ctx->data;
118 case EVP_PKEY_CTRL_DSA_PARAMGEN_BITS:
124 case EVP_PKEY_CTRL_DSA_PARAMGEN_Q_BITS:
125 if (p1 != 160 && p1 != 224 && p1 && p1 != 256)
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);
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);
158 case EVP_PKEY_CTRL_GET_MD:
159 *(const EVP_MD **)p2 = dctx->md;
162 case EVP_PKEY_CTRL_DIGESTINIT:
163 case EVP_PKEY_CTRL_PKCS7_SIGN:
164 case EVP_PKEY_CTRL_CMS_SIGN:
167 case EVP_PKEY_CTRL_PEER_KEY:
168 DSAerr(DSA_F_PKEY_DSA_CTRL,
169 EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
177 static int pkey_dsa_ctrl_str(EVP_PKEY_CTX *ctx,
178 const char *type, const char *value)
180 if (strcmp(type, "dsa_paramgen_bits") == 0) {
183 return EVP_PKEY_CTX_set_dsa_paramgen_bits(ctx, nbits);
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);
189 if (strcmp(type, "dsa_paramgen_md") == 0) {
190 const EVP_MD *md = EVP_get_digestbyname(value);
193 DSAerr(DSA_F_PKEY_DSA_CTRL_STR, DSA_R_INVALID_DIGEST_TYPE);
196 return EVP_PKEY_CTX_set_dsa_paramgen_md(ctx, md);
201 static int pkey_dsa_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
204 DSA_PKEY_CTX *dctx = ctx->data;
208 if (ctx->pkey_gencb) {
209 pcb = BN_GENCB_new();
212 evp_pkey_set_cb_translate(pcb, ctx);
220 ret = ffc_params_FIPS186_4_generate(NULL, &dsa->params, FFC_PARAM_TYPE_DSA,
221 dctx->nbits, dctx->qbits, dctx->pmd,
225 EVP_PKEY_assign_DSA(pkey, dsa);
231 static int pkey_dsa_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
235 if (ctx->pkey == NULL) {
236 DSAerr(DSA_F_PKEY_DSA_KEYGEN, DSA_R_NO_PARAMETERS_SET);
242 EVP_PKEY_assign_DSA(pkey, dsa);
243 /* Note: if error return, pkey is freed by parent routine */
244 if (!EVP_PKEY_copy_parameters(pkey, ctx->pkey))
246 return DSA_generate_key(pkey->pkey.dsa);
249 static const EVP_PKEY_METHOD dsa_pkey_meth = {
251 EVP_PKEY_FLAG_AUTOARGLEN,
282 const EVP_PKEY_METHOD *dsa_pkey_method(void)
284 return &dsa_pkey_meth;