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openssl/crypto/dsa/dsa_ameth.c

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/*
* Copyright 2006-2024 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
/*
* DSA low level APIs are deprecated for public use, but still ok for
* internal use.
*/
#include "internal/deprecated.h"
#include <stdio.h>
#include <openssl/x509.h>
#include <openssl/asn1.h>
#include <openssl/bn.h>
#include <openssl/core_names.h>
#include <openssl/param_build.h>
#include "internal/cryptlib.h"
#include "crypto/asn1.h"
#include "crypto/dsa.h"
#include "crypto/evp.h"
#include "internal/ffc.h"
#include "dsa_local.h"
static int dsa_pub_decode(EVP_PKEY *pkey, const X509_PUBKEY *pubkey)
{
const unsigned char *p, *pm;
int pklen, pmlen;
int ptype;
const void *pval;
const ASN1_STRING *pstr;
X509_ALGOR *palg;
ASN1_INTEGER *public_key = NULL;
DSA *dsa = NULL;
if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey))
return 0;
X509_ALGOR_get0(NULL, &ptype, &pval, palg);
if (ptype == V_ASN1_SEQUENCE) {
pstr = pval;
pm = pstr->data;
pmlen = pstr->length;
if ((dsa = d2i_DSAparams(NULL, &pm, pmlen)) == NULL) {
ERR_raise(ERR_LIB_DSA, DSA_R_DECODE_ERROR);
goto err;
}
} else if ((ptype == V_ASN1_NULL) || (ptype == V_ASN1_UNDEF)) {
if ((dsa = DSA_new()) == NULL) {
ERR_raise(ERR_LIB_DSA, ERR_R_DSA_LIB);
goto err;
}
} else {
ERR_raise(ERR_LIB_DSA, DSA_R_PARAMETER_ENCODING_ERROR);
goto err;
}
if ((public_key = d2i_ASN1_INTEGER(NULL, &p, pklen)) == NULL) {
ERR_raise(ERR_LIB_DSA, DSA_R_DECODE_ERROR);
goto err;
}
if ((dsa->pub_key = ASN1_INTEGER_to_BN(public_key, NULL)) == NULL) {
ERR_raise(ERR_LIB_DSA, DSA_R_BN_DECODE_ERROR);
goto err;
}
dsa->dirty_cnt++;
ASN1_INTEGER_free(public_key);
EVP_PKEY_assign_DSA(pkey, dsa);
return 1;
err:
ASN1_INTEGER_free(public_key);
DSA_free(dsa);
return 0;
}
static int dsa_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
{
DSA *dsa;
int ptype;
unsigned char *penc = NULL;
int penclen;
ASN1_STRING *str = NULL;
ASN1_INTEGER *pubint = NULL;
ASN1_OBJECT *aobj;
dsa = pkey->pkey.dsa;
if (pkey->save_parameters
&& dsa->params.p != NULL
&& dsa->params.q != NULL
&& dsa->params.g != NULL) {
str = ASN1_STRING_new();
if (str == NULL) {
ERR_raise(ERR_LIB_DSA, ERR_R_ASN1_LIB);
goto err;
}
str->length = i2d_DSAparams(dsa, &str->data);
if (str->length <= 0) {
ERR_raise(ERR_LIB_DSA, ERR_R_ASN1_LIB);
goto err;
}
ptype = V_ASN1_SEQUENCE;
} else
ptype = V_ASN1_UNDEF;
pubint = BN_to_ASN1_INTEGER(dsa->pub_key, NULL);
if (pubint == NULL) {
ERR_raise(ERR_LIB_DSA, ERR_R_ASN1_LIB);
goto err;
}
penclen = i2d_ASN1_INTEGER(pubint, &penc);
ASN1_INTEGER_free(pubint);
if (penclen <= 0) {
ERR_raise(ERR_LIB_DSA, ERR_R_ASN1_LIB);
goto err;
}
aobj = OBJ_nid2obj(EVP_PKEY_DSA);
if (aobj == NULL)
goto err;
if (X509_PUBKEY_set0_param(pk, aobj, ptype, str, penc, penclen))
return 1;
err:
OPENSSL_free(penc);
ASN1_STRING_free(str);
return 0;
}
/*
* In PKCS#8 DSA: you just get a private key integer and parameters in the
* AlgorithmIdentifier the pubkey must be recalculated.
*/
static int dsa_priv_decode(EVP_PKEY *pkey, const PKCS8_PRIV_KEY_INFO *p8)
{
int ret = 0;
DSA *dsa = ossl_dsa_key_from_pkcs8(p8, NULL, NULL);
if (dsa != NULL) {
ret = 1;
EVP_PKEY_assign_DSA(pkey, dsa);
}
return ret;
}
static int dsa_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
{
ASN1_STRING *params = NULL;
ASN1_INTEGER *prkey = NULL;
unsigned char *dp = NULL;
int dplen;
if (pkey->pkey.dsa == NULL|| pkey->pkey.dsa->priv_key == NULL) {
ERR_raise(ERR_LIB_DSA, DSA_R_MISSING_PARAMETERS);
goto err;
}
params = ASN1_STRING_new();
if (params == NULL) {
ERR_raise(ERR_LIB_DSA, ERR_R_ASN1_LIB);
goto err;
}
params->length = i2d_DSAparams(pkey->pkey.dsa, &params->data);
if (params->length <= 0) {
ERR_raise(ERR_LIB_DSA, ERR_R_ASN1_LIB);
goto err;
}
params->type = V_ASN1_SEQUENCE;
/* Get private key into integer */
prkey = BN_to_ASN1_INTEGER(pkey->pkey.dsa->priv_key, NULL);
if (prkey == NULL) {
ERR_raise(ERR_LIB_DSA, DSA_R_BN_ERROR);
goto err;
}
dplen = i2d_ASN1_INTEGER(prkey, &dp);
ASN1_STRING_clear_free(prkey);
if (dplen <= 0) {
ERR_raise(ERR_LIB_DSA, DSA_R_BN_ERROR);
goto err;
}
if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_dsa), 0,
V_ASN1_SEQUENCE, params, dp, dplen)) {
OPENSSL_clear_free(dp, dplen);
goto err;
}
return 1;
err:
ASN1_STRING_free(params);
return 0;
}
static int int_dsa_size(const EVP_PKEY *pkey)
{
return DSA_size(pkey->pkey.dsa);
}
static int dsa_bits(const EVP_PKEY *pkey)
{
return DSA_bits(pkey->pkey.dsa);
}
static int dsa_security_bits(const EVP_PKEY *pkey)
{
return DSA_security_bits(pkey->pkey.dsa);
}
static int dsa_missing_parameters(const EVP_PKEY *pkey)
{
DSA *dsa;
dsa = pkey->pkey.dsa;
return dsa == NULL
|| dsa->params.p == NULL
|| dsa->params.q == NULL
|| dsa->params.g == NULL;
}
static int dsa_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
{
if (to->pkey.dsa == NULL) {
to->pkey.dsa = DSA_new();
if (to->pkey.dsa == NULL)
return 0;
}
if (!ossl_ffc_params_copy(&to->pkey.dsa->params, &from->pkey.dsa->params))
return 0;
to->pkey.dsa->dirty_cnt++;
return 1;
}
static int dsa_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
{
return ossl_ffc_params_cmp(&a->pkey.dsa->params, &b->pkey.dsa->params, 1);
}
static int dsa_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
{
return BN_cmp(b->pkey.dsa->pub_key, a->pkey.dsa->pub_key) == 0;
}
static void int_dsa_free(EVP_PKEY *pkey)
{
DSA_free(pkey->pkey.dsa);
}
static int do_dsa_print(BIO *bp, const DSA *x, int off, int ptype)
{
int ret = 0;
const char *ktype = NULL;
const BIGNUM *priv_key, *pub_key;
int mod_len = 0;
if (x->params.p != NULL)
mod_len = DSA_bits(x);
if (ptype == 2)
priv_key = x->priv_key;
else
priv_key = NULL;
if (ptype > 0)
pub_key = x->pub_key;
else
pub_key = NULL;
if (ptype == 2)
ktype = "Private-Key";
else if (ptype == 1)
ktype = "Public-Key";
else
ktype = "DSA-Parameters";
if (priv_key != NULL) {
if (!BIO_indent(bp, off, 128))
goto err;
if (BIO_printf(bp, "%s: (%d bit)\n", ktype, mod_len) <= 0)
goto err;
} else {
if (BIO_printf(bp, "Public-Key: (%d bit)\n", mod_len) <= 0)
goto err;
}
if (!ASN1_bn_print(bp, "priv:", priv_key, NULL, off))
goto err;
if (!ASN1_bn_print(bp, "pub: ", pub_key, NULL, off))
goto err;
if (!ossl_ffc_params_print(bp, &x->params, off))
goto err;
ret = 1;
err:
return ret;
}
static int dsa_param_decode(EVP_PKEY *pkey,
const unsigned char **pder, int derlen)
{
DSA *dsa;
if ((dsa = d2i_DSAparams(NULL, pder, derlen)) == NULL)
return 0;
dsa->dirty_cnt++;
EVP_PKEY_assign_DSA(pkey, dsa);
return 1;
}
static int dsa_param_encode(const EVP_PKEY *pkey, unsigned char **pder)
{
return i2d_DSAparams(pkey->pkey.dsa, pder);
}
static int dsa_param_print(BIO *bp, const EVP_PKEY *pkey, int indent,
ASN1_PCTX *ctx)
{
return do_dsa_print(bp, pkey->pkey.dsa, indent, 0);
}
static int dsa_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent,
ASN1_PCTX *ctx)
{
return do_dsa_print(bp, pkey->pkey.dsa, indent, 1);
}
static int dsa_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent,
ASN1_PCTX *ctx)
{
return do_dsa_print(bp, pkey->pkey.dsa, indent, 2);
}
static int old_dsa_priv_decode(EVP_PKEY *pkey,
const unsigned char **pder, int derlen)
{
DSA *dsa;
if ((dsa = d2i_DSAPrivateKey(NULL, pder, derlen)) == NULL) {
ERR_raise(ERR_LIB_DSA, ERR_R_DSA_LIB);
return 0;
}
dsa->dirty_cnt++;
EVP_PKEY_assign_DSA(pkey, dsa);
return 1;
}
static int old_dsa_priv_encode(const EVP_PKEY *pkey, unsigned char **pder)
{
return i2d_DSAPrivateKey(pkey->pkey.dsa, pder);
}
static int dsa_sig_print(BIO *bp, const X509_ALGOR *sigalg,
const ASN1_STRING *sig, int indent, ASN1_PCTX *pctx)
{
DSA_SIG *dsa_sig;
const unsigned char *p;
if (sig == NULL) {
if (BIO_puts(bp, "\n") <= 0)
return 0;
else
return 1;
}
p = sig->data;
dsa_sig = d2i_DSA_SIG(NULL, &p, sig->length);
if (dsa_sig != NULL) {
int rv = 0;
const BIGNUM *r, *s;
DSA_SIG_get0(dsa_sig, &r, &s);
if (BIO_write(bp, "\n", 1) != 1)
goto err;
if (!ASN1_bn_print(bp, "r: ", r, NULL, indent))
goto err;
if (!ASN1_bn_print(bp, "s: ", s, NULL, indent))
goto err;
rv = 1;
err:
DSA_SIG_free(dsa_sig);
return rv;
}
if (BIO_puts(bp, "\n") <= 0)
return 0;
return X509_signature_dump(bp, sig, indent);
}
static int dsa_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
{
switch (op) {
case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
*(int *)arg2 = NID_sha256;
return 1;
default:
return -2;
}
}
static size_t dsa_pkey_dirty_cnt(const EVP_PKEY *pkey)
{
return pkey->pkey.dsa->dirty_cnt;
}
static int dsa_pkey_export_to(const EVP_PKEY *from, void *to_keydata,
OSSL_FUNC_keymgmt_import_fn *importer,
OSSL_LIB_CTX *libctx, const char *propq)
{
DSA *dsa = from->pkey.dsa;
OSSL_PARAM_BLD *tmpl;
const BIGNUM *p = DSA_get0_p(dsa), *g = DSA_get0_g(dsa);
const BIGNUM *q = DSA_get0_q(dsa), *pub_key = DSA_get0_pub_key(dsa);
const BIGNUM *priv_key = DSA_get0_priv_key(dsa);
OSSL_PARAM *params;
int selection = 0;
int rv = 0;
if (p == NULL || q == NULL || g == NULL)
return 0;
tmpl = OSSL_PARAM_BLD_new();
if (tmpl == NULL)
return 0;
if (!OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_P, p)
|| !OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_Q, q)
|| !OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_G, g))
goto err;
selection |= OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS;
if (pub_key != NULL) {
if (!OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_PUB_KEY,
pub_key))
goto err;
selection |= OSSL_KEYMGMT_SELECT_PUBLIC_KEY;
}
if (priv_key != NULL) {
if (!OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_PRIV_KEY,
priv_key))
goto err;
selection |= OSSL_KEYMGMT_SELECT_PRIVATE_KEY;
}
if ((params = OSSL_PARAM_BLD_to_param(tmpl)) == NULL)
goto err;
/* We export, the provider imports */
rv = importer(to_keydata, selection, params);
OSSL_PARAM_free(params);
err:
OSSL_PARAM_BLD_free(tmpl);
return rv;
}
static int dsa_pkey_import_from(const OSSL_PARAM params[], void *vpctx)
{
EVP_PKEY_CTX *pctx = vpctx;
EVP_PKEY *pkey = EVP_PKEY_CTX_get0_pkey(pctx);
DSA *dsa = ossl_dsa_new(pctx->libctx);
if (dsa == NULL) {
ERR_raise(ERR_LIB_DSA, ERR_R_DSA_LIB);
return 0;
}
if (!ossl_dsa_ffc_params_fromdata(dsa, params)
|| !ossl_dsa_key_fromdata(dsa, params, 1)
|| !EVP_PKEY_assign_DSA(pkey, dsa)) {
DSA_free(dsa);
return 0;
}
return 1;
}
static int dsa_pkey_copy(EVP_PKEY *to, EVP_PKEY *from)
{
DSA *dsa = from->pkey.dsa;
DSA *dupkey = NULL;
int ret;
if (dsa != NULL) {
dupkey = ossl_dsa_dup(dsa, OSSL_KEYMGMT_SELECT_ALL);
if (dupkey == NULL)
return 0;
}
ret = EVP_PKEY_assign_DSA(to, dupkey);
if (!ret)
DSA_free(dupkey);
return ret;
}
/* NB these are sorted in pkey_id order, lowest first */
const EVP_PKEY_ASN1_METHOD ossl_dsa_asn1_meths[4] = {
/* This aliases NID_dsa with NID_dsa_2 */
{
EVP_PKEY_DSA1,
EVP_PKEY_DSA,
ASN1_PKEY_ALIAS},
/* This aliases NID_dsaWithSHA with NID_dsaWithSHA_2 */
{
EVP_PKEY_DSA4,
EVP_PKEY_DSA2,
ASN1_PKEY_ALIAS},
/* This aliases NID_dsaWithSHA with NID_dsaWithSHA1 */
{
EVP_PKEY_DSA3,
EVP_PKEY_DSA2,
ASN1_PKEY_ALIAS},
{
EVP_PKEY_DSA,
EVP_PKEY_DSA,
0,
"DSA",
"OpenSSL DSA method",
dsa_pub_decode,
dsa_pub_encode,
dsa_pub_cmp,
dsa_pub_print,
dsa_priv_decode,
dsa_priv_encode,
dsa_priv_print,
int_dsa_size,
dsa_bits,
dsa_security_bits,
dsa_param_decode,
dsa_param_encode,
dsa_missing_parameters,
dsa_copy_parameters,
dsa_cmp_parameters,
dsa_param_print,
dsa_sig_print,
int_dsa_free,
dsa_pkey_ctrl,
old_dsa_priv_decode,
old_dsa_priv_encode,
NULL, NULL, NULL,
NULL, NULL, NULL,
NULL, NULL, NULL, NULL,
dsa_pkey_dirty_cnt,
dsa_pkey_export_to,
dsa_pkey_import_from,
dsa_pkey_copy
}
};
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