2 * Copyright 2006-2018 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (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 #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"
19 /* DSA pkey context structure */
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 */
29 const EVP_MD *md; /* MD for the signature */
32 static int pkey_dsa_init(EVP_PKEY_CTX *ctx)
34 DSA_PKEY_CTX *dctx = OPENSSL_malloc(sizeof(*dctx));
44 ctx->keygen_info = dctx->gentmp;
45 ctx->keygen_info_count = 2;
50 static int pkey_dsa_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
52 DSA_PKEY_CTX *dctx, *sctx;
54 if (!pkey_dsa_init(dst))
58 dctx->nbits = sctx->nbits;
59 dctx->qbits = sctx->qbits;
60 dctx->pmd = sctx->pmd;
65 static void pkey_dsa_cleanup(EVP_PKEY_CTX *ctx)
67 DSA_PKEY_CTX *dctx = ctx->data;
71 static int pkey_dsa_sign(EVP_PKEY_CTX *ctx, unsigned char *sig,
72 size_t *siglen, const unsigned char *tbs,
77 DSA_PKEY_CTX *dctx = ctx->data;
78 DSA *dsa = ctx->pkey->pkey.dsa;
81 if (tbslen != (size_t)EVP_MD_size(dctx->md))
84 if (tbslen != SHA_DIGEST_LENGTH)
88 ret = DSA_sign(0, tbs, tbslen, sig, &sltmp, dsa);
96 static int pkey_dsa_verify(EVP_PKEY_CTX *ctx,
97 const unsigned char *sig, size_t siglen,
98 const unsigned char *tbs, size_t tbslen)
101 DSA_PKEY_CTX *dctx = ctx->data;
102 DSA *dsa = ctx->pkey->pkey.dsa;
105 if (tbslen != (size_t)EVP_MD_size(dctx->md))
108 if (tbslen != SHA_DIGEST_LENGTH)
112 ret = DSA_verify(0, tbs, tbslen, sig, siglen, dsa);
117 static int pkey_dsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
119 DSA_PKEY_CTX *dctx = ctx->data;
122 case EVP_PKEY_CTRL_DSA_PARAMGEN_BITS:
128 case EVP_PKEY_CTRL_DSA_PARAMGEN_Q_BITS:
129 if (p1 != 160 && p1 != 224 && p1 && p1 != 256)
134 case EVP_PKEY_CTRL_DSA_PARAMGEN_MD:
135 if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1 &&
136 EVP_MD_type((const EVP_MD *)p2) != NID_sha224 &&
137 EVP_MD_type((const EVP_MD *)p2) != NID_sha256) {
138 DSAerr(DSA_F_PKEY_DSA_CTRL, DSA_R_INVALID_DIGEST_TYPE);
144 case EVP_PKEY_CTRL_MD:
145 if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1 &&
146 EVP_MD_type((const EVP_MD *)p2) != NID_dsa &&
147 EVP_MD_type((const EVP_MD *)p2) != NID_dsaWithSHA &&
148 EVP_MD_type((const EVP_MD *)p2) != NID_sha224 &&
149 EVP_MD_type((const EVP_MD *)p2) != NID_sha256 &&
150 EVP_MD_type((const EVP_MD *)p2) != NID_sha384 &&
151 EVP_MD_type((const EVP_MD *)p2) != NID_sha512) {
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_ctrl(ctx, EVP_PKEY_DSA, EVP_PKEY_OP_PARAMGEN,
188 EVP_PKEY_CTRL_DSA_PARAMGEN_Q_BITS, qbits,
191 if (strcmp(type, "dsa_paramgen_md") == 0) {
192 const EVP_MD *md = EVP_get_digestbyname(value);
195 DSAerr(DSA_F_PKEY_DSA_CTRL_STR, DSA_R_INVALID_DIGEST_TYPE);
198 return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DSA, EVP_PKEY_OP_PARAMGEN,
199 EVP_PKEY_CTRL_DSA_PARAMGEN_MD, 0,
205 static int pkey_dsa_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
208 DSA_PKEY_CTX *dctx = ctx->data;
212 if (ctx->pkey_gencb) {
213 pcb = BN_GENCB_new();
216 evp_pkey_set_cb_translate(pcb, ctx);
224 ret = dsa_builtin_paramgen(dsa, dctx->nbits, dctx->qbits, dctx->pmd,
225 NULL, 0, NULL, NULL, NULL, pcb);
228 EVP_PKEY_assign_DSA(pkey, dsa);
234 static int pkey_dsa_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
238 if (ctx->pkey == NULL) {
239 DSAerr(DSA_F_PKEY_DSA_KEYGEN, DSA_R_NO_PARAMETERS_SET);
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))
249 return DSA_generate_key(pkey->pkey.dsa);
252 const EVP_PKEY_METHOD dsa_pkey_meth = {
254 EVP_PKEY_FLAG_AUTOARGLEN,