/*
- * Copyright 2006-2016 The OpenSSL Project Authors. All Rights Reserved.
+ * Copyright 2006-2020 The OpenSSL Project Authors. All Rights Reserved.
*
- * Licensed under the OpenSSL license (the "License"). You may not use
+ * 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
*/
+/*
+ * ECDH and ECDSA low level APIs are deprecated for public use, but still ok
+ * for internal use.
+ */
+#include "internal/deprecated.h"
+
#include <stdio.h>
#include "internal/cryptlib.h"
#include <openssl/x509.h>
#include <openssl/ec.h>
#include <openssl/bn.h>
-#include <openssl/cms.h>
#include <openssl/asn1t.h>
-#include "internal/asn1_int.h"
-#include "internal/evp_int.h"
-#include "ec_lcl.h"
-
-#ifndef OPENSSL_NO_CMS
-static int ecdh_cms_decrypt(CMS_RecipientInfo *ri);
-static int ecdh_cms_encrypt(CMS_RecipientInfo *ri);
-#endif
+#include "crypto/asn1.h"
+#include "crypto/evp.h"
+#include "crypto/x509.h"
+#include <openssl/core_names.h>
+#include "openssl/param_build.h"
+#include "ec_local.h"
-static int eckey_param2type(int *pptype, void **ppval, EC_KEY *ec_key)
+static int eckey_param2type(int *pptype, void **ppval, const EC_KEY *ec_key)
{
const EC_GROUP *group;
int nid;
+
if (ec_key == NULL || (group = EC_KEY_get0_group(ec_key)) == NULL) {
ECerr(EC_F_ECKEY_PARAM2TYPE, EC_R_MISSING_PARAMETERS);
return 0;
&& (nid = EC_GROUP_get_curve_name(group)))
/* we have a 'named curve' => just set the OID */
{
- *ppval = OBJ_nid2obj(nid);
+ ASN1_OBJECT *asn1obj = OBJ_nid2obj(nid);
+
+ if (asn1obj == NULL || OBJ_length(asn1obj) == 0) {
+ ASN1_OBJECT_free(asn1obj);
+ ECerr(EC_F_ECKEY_PARAM2TYPE, EC_R_MISSING_OID);
+ return 0;
+ }
+ *ppval = asn1obj;
*pptype = V_ASN1_OBJECT;
} else { /* explicit parameters */
static int eckey_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
{
- EC_KEY *ec_key = pkey->pkey.ec;
+ const EC_KEY *ec_key = pkey->pkey.ec;
void *pval = NULL;
int ptype;
unsigned char *penc = NULL, *p;
return 0;
}
-static EC_KEY *eckey_type2param(int ptype, const void *pval)
+static EC_KEY *eckey_type2param(int ptype, const void *pval,
+ OSSL_LIB_CTX *libctx, const char *propq)
{
EC_KEY *eckey = NULL;
+ EC_GROUP *group = NULL;
+
+ if ((eckey = EC_KEY_new_ex(libctx, propq)) == NULL) {
+ ECerr(EC_F_ECKEY_TYPE2PARAM, ERR_R_MALLOC_FAILURE);
+ goto ecerr;
+ }
+
if (ptype == V_ASN1_SEQUENCE) {
const ASN1_STRING *pstr = pval;
- const unsigned char *pm = NULL;
- int pmlen;
- pm = pstr->data;
- pmlen = pstr->length;
- if ((eckey = d2i_ECParameters(NULL, &pm, pmlen)) == NULL) {
+ const unsigned char *pm = pstr->data;
+ int pmlen = pstr->length;
+
+
+ if (d2i_ECParameters(&eckey, &pm, pmlen) == NULL) {
ECerr(EC_F_ECKEY_TYPE2PARAM, EC_R_DECODE_ERROR);
goto ecerr;
}
} else if (ptype == V_ASN1_OBJECT) {
const ASN1_OBJECT *poid = pval;
- EC_GROUP *group;
/*
* type == V_ASN1_OBJECT => the parameters are given by an asn1 OID
*/
- if ((eckey = EC_KEY_new()) == NULL) {
- ECerr(EC_F_ECKEY_TYPE2PARAM, ERR_R_MALLOC_FAILURE);
- goto ecerr;
- }
- group = EC_GROUP_new_by_curve_name(OBJ_obj2nid(poid));
+
+ group = EC_GROUP_new_by_curve_name_ex(libctx, propq, OBJ_obj2nid(poid));
if (group == NULL)
goto ecerr;
EC_GROUP_set_asn1_flag(group, OPENSSL_EC_NAMED_CURVE);
ecerr:
EC_KEY_free(eckey);
+ EC_GROUP_free(group);
return NULL;
}
-static int eckey_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey)
+static int eckey_pub_decode(EVP_PKEY *pkey, const X509_PUBKEY *pubkey)
{
const unsigned char *p = NULL;
const void *pval;
int ptype, pklen;
EC_KEY *eckey = NULL;
X509_ALGOR *palg;
+ OSSL_LIB_CTX *libctx = NULL;
+ const char *propq = NULL;
- if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey))
+ if (!X509_PUBKEY_get0_libctx(&libctx, &propq, pubkey)
+ || !X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey))
return 0;
X509_ALGOR_get0(NULL, &ptype, &pval, palg);
- eckey = eckey_type2param(ptype, pval);
+ eckey = eckey_type2param(ptype, pval, libctx, propq);
- if (!eckey) {
- ECerr(EC_F_ECKEY_PUB_DECODE, ERR_R_EC_LIB);
+ if (!eckey)
return 0;
- }
/* We have parameters now set public key */
if (!o2i_ECPublicKey(&eckey, &p, pklen)) {
const EC_GROUP *group = EC_KEY_get0_group(b->pkey.ec);
const EC_POINT *pa = EC_KEY_get0_public_key(a->pkey.ec),
*pb = EC_KEY_get0_public_key(b->pkey.ec);
+
if (group == NULL || pa == NULL || pb == NULL)
return -2;
r = EC_POINT_cmp(group, pa, pb, NULL);
return -2;
}
-static int eckey_priv_decode(EVP_PKEY *pkey, const PKCS8_PRIV_KEY_INFO *p8)
+static int eckey_priv_decode_ex(EVP_PKEY *pkey, const PKCS8_PRIV_KEY_INFO *p8,
+ OSSL_LIB_CTX *libctx, const char *propq)
{
const unsigned char *p = NULL;
const void *pval;
return 0;
X509_ALGOR_get0(NULL, &ptype, &pval, palg);
- eckey = eckey_type2param(ptype, pval);
-
- if (!eckey)
- goto ecliberr;
+ eckey = eckey_type2param(ptype, pval, libctx, propq);
+ if (eckey == NULL)
+ goto err;
/* We have parameters now set private key */
if (!d2i_ECPrivateKey(&eckey, &p, pklen)) {
- ECerr(EC_F_ECKEY_PRIV_DECODE, EC_R_DECODE_ERROR);
- goto ecerr;
+ ECerr(0, EC_R_DECODE_ERROR);
+ goto err;
}
EVP_PKEY_assign_EC_KEY(pkey, eckey);
return 1;
- ecliberr:
- ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
- ecerr:
+ err:
EC_KEY_free(eckey);
return 0;
}
static int ec_security_bits(const EVP_PKEY *pkey)
{
int ecbits = ec_bits(pkey);
+
if (ecbits >= 512)
return 256;
if (ecbits >= 384)
{
const EC_GROUP *group_a = EC_KEY_get0_group(a->pkey.ec),
*group_b = EC_KEY_get0_group(b->pkey.ec);
+
if (group_a == NULL || group_b == NULL)
return -2;
if (EC_GROUP_cmp(group_a, group_b, NULL))
{
EC_KEY *eckey;
- if ((eckey = d2i_ECParameters(NULL, pder, derlen)) == NULL) {
- ECerr(EC_F_ECKEY_PARAM_DECODE, ERR_R_EC_LIB);
+ if ((eckey = d2i_ECParameters(NULL, pder, derlen)) == NULL)
return 0;
- }
EVP_PKEY_assign_EC_KEY(pkey, eckey);
return 1;
}
{
EC_KEY *ec;
- if ((ec = d2i_ECPrivateKey(NULL, pder, derlen)) == NULL) {
- ECerr(EC_F_OLD_EC_PRIV_DECODE, EC_R_DECODE_ERROR);
+ if ((ec = d2i_ECPrivateKey(NULL, pder, derlen)) == NULL)
return 0;
- }
EVP_PKEY_assign_EC_KEY(pkey, ec);
return 1;
}
if (arg1 == 0) {
int snid, hnid;
X509_ALGOR *alg1, *alg2;
+
PKCS7_SIGNER_INFO_get0_algs(arg2, NULL, &alg1, &alg2);
if (alg1 == NULL || alg1->algorithm == NULL)
return -1;
X509_ALGOR_set0(alg2, OBJ_nid2obj(snid), V_ASN1_UNDEF, 0);
}
return 1;
-#ifndef OPENSSL_NO_CMS
- case ASN1_PKEY_CTRL_CMS_SIGN:
- if (arg1 == 0) {
- int snid, hnid;
- X509_ALGOR *alg1, *alg2;
- CMS_SignerInfo_get0_algs(arg2, NULL, NULL, &alg1, &alg2);
- if (alg1 == NULL || alg1->algorithm == NULL)
- return -1;
- hnid = OBJ_obj2nid(alg1->algorithm);
- if (hnid == NID_undef)
- return -1;
- if (!OBJ_find_sigid_by_algs(&snid, hnid, EVP_PKEY_id(pkey)))
- return -1;
- X509_ALGOR_set0(alg2, OBJ_nid2obj(snid), V_ASN1_UNDEF, 0);
- }
- return 1;
-
- case ASN1_PKEY_CTRL_CMS_ENVELOPE:
- if (arg1 == 1)
- return ecdh_cms_decrypt(arg2);
- else if (arg1 == 0)
- return ecdh_cms_encrypt(arg2);
- return -2;
-
- case ASN1_PKEY_CTRL_CMS_RI_TYPE:
- *(int *)arg2 = CMS_RECIPINFO_AGREE;
- return 1;
-#endif
case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
+ if (EVP_PKEY_id(pkey) == EVP_PKEY_SM2) {
+ /* For SM2, the only valid digest-alg is SM3 */
+ *(int *)arg2 = NID_sm3;
+ return 2; /* Make it mandatory */
+ }
*(int *)arg2 = NID_sha256;
- return 2;
+ return 1;
case ASN1_PKEY_CTRL_SET1_TLS_ENCPT:
return EC_KEY_oct2key(EVP_PKEY_get0_EC_KEY(pkey), arg2, arg1, NULL);
return EC_GROUP_check(eckey->group, NULL);
}
+static
+size_t ec_pkey_dirty_cnt(const EVP_PKEY *pkey)
+{
+ return pkey->pkey.ec->dirty_cnt;
+}
+
+static
+int ec_pkey_export_to(const EVP_PKEY *from, void *to_keydata,
+ EVP_KEYMGMT *to_keymgmt, OSSL_LIB_CTX *libctx,
+ const char *propq)
+{
+ const EC_KEY *eckey = NULL;
+ const EC_GROUP *ecg = NULL;
+ unsigned char *pub_key_buf = NULL, *gen_buf = NULL;
+ size_t pub_key_buflen;
+ OSSL_PARAM_BLD *tmpl;
+ OSSL_PARAM *params = NULL;
+ const BIGNUM *priv_key = NULL;
+ const EC_POINT *pub_point = NULL;
+ int selection = 0;
+ int rv = 0;
+ BN_CTX *bnctx = NULL;
+
+ if (from == NULL
+ || (eckey = from->pkey.ec) == NULL
+ || (ecg = EC_KEY_get0_group(eckey)) == NULL)
+ return 0;
+
+ /*
+ * If the EC_KEY method is foreign, then we can't be sure of anything,
+ * and can therefore not export or pretend to export.
+ */
+ if (EC_KEY_get_method(eckey) != EC_KEY_OpenSSL())
+ return 0;
+
+ tmpl = OSSL_PARAM_BLD_new();
+ if (tmpl == NULL)
+ return 0;
+
+ /*
+ * EC_POINT_point2buf() can generate random numbers in some
+ * implementations so we need to ensure we use the correct libctx.
+ */
+ bnctx = BN_CTX_new_ex(libctx);
+ if (bnctx == NULL)
+ goto err;
+ BN_CTX_start(bnctx);
+
+ /* export the domain parameters */
+ if (!ec_group_todata(ecg, tmpl, NULL, libctx, propq, bnctx, &gen_buf))
+ goto err;
+ selection |= OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS;
+
+ priv_key = EC_KEY_get0_private_key(eckey);
+ pub_point = EC_KEY_get0_public_key(eckey);
+
+ if (pub_point != NULL) {
+ /* convert pub_point to a octet string according to the SECG standard */
+ if ((pub_key_buflen = EC_POINT_point2buf(ecg, pub_point,
+ POINT_CONVERSION_COMPRESSED,
+ &pub_key_buf, bnctx)) == 0
+ || !OSSL_PARAM_BLD_push_octet_string(tmpl,
+ OSSL_PKEY_PARAM_PUB_KEY,
+ pub_key_buf,
+ pub_key_buflen))
+ goto err;
+ selection |= OSSL_KEYMGMT_SELECT_PUBLIC_KEY;
+ }
+
+ if (priv_key != NULL) {
+ size_t sz;
+ int ecbits;
+ int ecdh_cofactor_mode;
+
+ /*
+ * Key import/export should never leak the bit length of the secret
+ * scalar in the key.
+ *
+ * For this reason, on export we use padded BIGNUMs with fixed length.
+ *
+ * When importing we also should make sure that, even if short lived,
+ * the newly created BIGNUM is marked with the BN_FLG_CONSTTIME flag as
+ * soon as possible, so that any processing of this BIGNUM might opt for
+ * constant time implementations in the backend.
+ *
+ * Setting the BN_FLG_CONSTTIME flag alone is never enough, we also have
+ * to preallocate the BIGNUM internal buffer to a fixed public size big
+ * enough that operations performed during the processing never trigger
+ * a realloc which would leak the size of the scalar through memory
+ * accesses.
+ *
+ * Fixed Length
+ * ------------
+ *
+ * The order of the large prime subgroup of the curve is our choice for
+ * a fixed public size, as that is generally the upper bound for
+ * generating a private key in EC cryptosystems and should fit all valid
+ * secret scalars.
+ *
+ * For padding on export we just use the bit length of the order
+ * converted to bytes (rounding up).
+ *
+ * For preallocating the BIGNUM storage we look at the number of "words"
+ * required for the internal representation of the order, and we
+ * preallocate 2 extra "words" in case any of the subsequent processing
+ * might temporarily overflow the order length.
+ */
+ ecbits = EC_GROUP_order_bits(ecg);
+ if (ecbits <= 0)
+ goto err;
+
+ sz = (ecbits + 7 ) / 8;
+ if (!OSSL_PARAM_BLD_push_BN_pad(tmpl,
+ OSSL_PKEY_PARAM_PRIV_KEY,
+ priv_key, sz))
+ goto err;
+ selection |= OSSL_KEYMGMT_SELECT_PRIVATE_KEY;
+
+ /*
+ * The ECDH Cofactor Mode is defined only if the EC_KEY actually
+ * contains a private key, so we check for the flag and export it only
+ * in this case.
+ */
+ ecdh_cofactor_mode =
+ (EC_KEY_get_flags(eckey) & EC_FLAG_COFACTOR_ECDH) ? 1 : 0;
+
+ /* Export the ECDH_COFACTOR_MODE parameter */
+ if (!OSSL_PARAM_BLD_push_int(tmpl,
+ OSSL_PKEY_PARAM_USE_COFACTOR_ECDH,
+ ecdh_cofactor_mode))
+ goto err;
+ selection |= OSSL_KEYMGMT_SELECT_OTHER_PARAMETERS;
+ }
+
+ params = OSSL_PARAM_BLD_to_param(tmpl);
+
+ /* We export, the provider imports */
+ rv = evp_keymgmt_import(to_keymgmt, to_keydata, selection, params);
+
+ err:
+ OSSL_PARAM_BLD_free(tmpl);
+ OSSL_PARAM_BLD_free_params(params);
+ OPENSSL_free(pub_key_buf);
+ OPENSSL_free(gen_buf);
+ BN_CTX_end(bnctx);
+ BN_CTX_free(bnctx);
+ return rv;
+}
+
+static int ec_pkey_import_from(const OSSL_PARAM params[], void *vpctx)
+{
+ EVP_PKEY_CTX *pctx = vpctx;
+ EVP_PKEY *pkey = EVP_PKEY_CTX_get0_pkey(pctx);
+ EC_KEY *ec = EC_KEY_new_ex(pctx->libctx, pctx->propquery);
+
+ if (ec == NULL) {
+ ERR_raise(ERR_LIB_DH, ERR_R_MALLOC_FAILURE);
+ return 0;
+ }
+
+ if (!ec_group_fromdata(ec, params)
+ || !ec_key_otherparams_fromdata(ec, params)
+ || !ec_key_fromdata(ec, params, 1)
+ || !EVP_PKEY_assign_EC_KEY(pkey, ec)) {
+ EC_KEY_free(ec);
+ return 0;
+ }
+ return 1;
+}
+
const EVP_PKEY_ASN1_METHOD eckey_asn1_meth = {
EVP_PKEY_EC,
EVP_PKEY_EC,
eckey_pub_cmp,
eckey_pub_print,
- eckey_priv_decode,
+ NULL,
eckey_priv_encode,
eckey_priv_print,
ec_pkey_check,
ec_pkey_public_check,
- ec_pkey_param_check
+ ec_pkey_param_check,
+
+ 0, /* set_priv_key */
+ 0, /* set_pub_key */
+ 0, /* get_priv_key */
+ 0, /* get_pub_key */
+
+ ec_pkey_dirty_cnt,
+ ec_pkey_export_to,
+ ec_pkey_import_from,
+ eckey_priv_decode_ex
};
+#if !defined(OPENSSL_NO_SM2)
+const EVP_PKEY_ASN1_METHOD sm2_asn1_meth = {
+ EVP_PKEY_SM2,
+ EVP_PKEY_EC,
+ ASN1_PKEY_ALIAS
+};
+#endif
+
int EC_KEY_print(BIO *bp, const EC_KEY *x, int off)
{
int private = EC_KEY_get0_private_key(x) != NULL;
{
return do_EC_KEY_print(bp, x, 4, EC_KEY_PRINT_PARAM);
}
-
-#ifndef OPENSSL_NO_CMS
-
-static int ecdh_cms_set_peerkey(EVP_PKEY_CTX *pctx,
- X509_ALGOR *alg, ASN1_BIT_STRING *pubkey)
-{
- const ASN1_OBJECT *aoid;
- int atype;
- const void *aval;
- int rv = 0;
- EVP_PKEY *pkpeer = NULL;
- EC_KEY *ecpeer = NULL;
- const unsigned char *p;
- int plen;
- X509_ALGOR_get0(&aoid, &atype, &aval, alg);
- if (OBJ_obj2nid(aoid) != NID_X9_62_id_ecPublicKey)
- goto err;
- /* If absent parameters get group from main key */
- if (atype == V_ASN1_UNDEF || atype == V_ASN1_NULL) {
- const EC_GROUP *grp;
- EVP_PKEY *pk;
- pk = EVP_PKEY_CTX_get0_pkey(pctx);
- if (!pk)
- goto err;
- grp = EC_KEY_get0_group(pk->pkey.ec);
- ecpeer = EC_KEY_new();
- if (ecpeer == NULL)
- goto err;
- if (!EC_KEY_set_group(ecpeer, grp))
- goto err;
- } else {
- ecpeer = eckey_type2param(atype, aval);
- if (!ecpeer)
- goto err;
- }
- /* We have parameters now set public key */
- plen = ASN1_STRING_length(pubkey);
- p = ASN1_STRING_get0_data(pubkey);
- if (!p || !plen)
- goto err;
- if (!o2i_ECPublicKey(&ecpeer, &p, plen))
- goto err;
- pkpeer = EVP_PKEY_new();
- if (pkpeer == NULL)
- goto err;
- EVP_PKEY_set1_EC_KEY(pkpeer, ecpeer);
- if (EVP_PKEY_derive_set_peer(pctx, pkpeer) > 0)
- rv = 1;
- err:
- EC_KEY_free(ecpeer);
- EVP_PKEY_free(pkpeer);
- return rv;
-}
-
-/* Set KDF parameters based on KDF NID */
-static int ecdh_cms_set_kdf_param(EVP_PKEY_CTX *pctx, int eckdf_nid)
-{
- int kdf_nid, kdfmd_nid, cofactor;
- const EVP_MD *kdf_md;
- if (eckdf_nid == NID_undef)
- return 0;
-
- /* Lookup KDF type, cofactor mode and digest */
- if (!OBJ_find_sigid_algs(eckdf_nid, &kdfmd_nid, &kdf_nid))
- return 0;
-
- if (kdf_nid == NID_dh_std_kdf)
- cofactor = 0;
- else if (kdf_nid == NID_dh_cofactor_kdf)
- cofactor = 1;
- else
- return 0;
-
- if (EVP_PKEY_CTX_set_ecdh_cofactor_mode(pctx, cofactor) <= 0)
- return 0;
-
- if (EVP_PKEY_CTX_set_ecdh_kdf_type(pctx, EVP_PKEY_ECDH_KDF_X9_62) <= 0)
- return 0;
-
- kdf_md = EVP_get_digestbynid(kdfmd_nid);
- if (!kdf_md)
- return 0;
-
- if (EVP_PKEY_CTX_set_ecdh_kdf_md(pctx, kdf_md) <= 0)
- return 0;
- return 1;
-}
-
-static int ecdh_cms_set_shared_info(EVP_PKEY_CTX *pctx, CMS_RecipientInfo *ri)
-{
- int rv = 0;
-
- X509_ALGOR *alg, *kekalg = NULL;
- ASN1_OCTET_STRING *ukm;
- const unsigned char *p;
- unsigned char *der = NULL;
- int plen, keylen;
- const EVP_CIPHER *kekcipher;
- EVP_CIPHER_CTX *kekctx;
-
- if (!CMS_RecipientInfo_kari_get0_alg(ri, &alg, &ukm))
- return 0;
-
- if (!ecdh_cms_set_kdf_param(pctx, OBJ_obj2nid(alg->algorithm))) {
- ECerr(EC_F_ECDH_CMS_SET_SHARED_INFO, EC_R_KDF_PARAMETER_ERROR);
- return 0;
- }
-
- if (alg->parameter->type != V_ASN1_SEQUENCE)
- return 0;
-
- p = alg->parameter->value.sequence->data;
- plen = alg->parameter->value.sequence->length;
- kekalg = d2i_X509_ALGOR(NULL, &p, plen);
- if (!kekalg)
- goto err;
- kekctx = CMS_RecipientInfo_kari_get0_ctx(ri);
- if (!kekctx)
- goto err;
- kekcipher = EVP_get_cipherbyobj(kekalg->algorithm);
- if (!kekcipher || EVP_CIPHER_mode(kekcipher) != EVP_CIPH_WRAP_MODE)
- goto err;
- if (!EVP_EncryptInit_ex(kekctx, kekcipher, NULL, NULL, NULL))
- goto err;
- if (EVP_CIPHER_asn1_to_param(kekctx, kekalg->parameter) <= 0)
- goto err;
-
- keylen = EVP_CIPHER_CTX_key_length(kekctx);
- if (EVP_PKEY_CTX_set_ecdh_kdf_outlen(pctx, keylen) <= 0)
- goto err;
-
- plen = CMS_SharedInfo_encode(&der, kekalg, ukm, keylen);
-
- if (!plen)
- goto err;
-
- if (EVP_PKEY_CTX_set0_ecdh_kdf_ukm(pctx, der, plen) <= 0)
- goto err;
- der = NULL;
-
- rv = 1;
- err:
- X509_ALGOR_free(kekalg);
- OPENSSL_free(der);
- return rv;
-}
-
-static int ecdh_cms_decrypt(CMS_RecipientInfo *ri)
-{
- EVP_PKEY_CTX *pctx;
- pctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
- if (!pctx)
- return 0;
- /* See if we need to set peer key */
- if (!EVP_PKEY_CTX_get0_peerkey(pctx)) {
- X509_ALGOR *alg;
- ASN1_BIT_STRING *pubkey;
- if (!CMS_RecipientInfo_kari_get0_orig_id(ri, &alg, &pubkey,
- NULL, NULL, NULL))
- return 0;
- if (!alg || !pubkey)
- return 0;
- if (!ecdh_cms_set_peerkey(pctx, alg, pubkey)) {
- ECerr(EC_F_ECDH_CMS_DECRYPT, EC_R_PEER_KEY_ERROR);
- return 0;
- }
- }
- /* Set ECDH derivation parameters and initialise unwrap context */
- if (!ecdh_cms_set_shared_info(pctx, ri)) {
- ECerr(EC_F_ECDH_CMS_DECRYPT, EC_R_SHARED_INFO_ERROR);
- return 0;
- }
- return 1;
-}
-
-static int ecdh_cms_encrypt(CMS_RecipientInfo *ri)
-{
- EVP_PKEY_CTX *pctx;
- EVP_PKEY *pkey;
- EVP_CIPHER_CTX *ctx;
- int keylen;
- X509_ALGOR *talg, *wrap_alg = NULL;
- const ASN1_OBJECT *aoid;
- ASN1_BIT_STRING *pubkey;
- ASN1_STRING *wrap_str;
- ASN1_OCTET_STRING *ukm;
- unsigned char *penc = NULL;
- int penclen;
- int rv = 0;
- int ecdh_nid, kdf_type, kdf_nid, wrap_nid;
- const EVP_MD *kdf_md;
- pctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
- if (!pctx)
- return 0;
- /* Get ephemeral key */
- pkey = EVP_PKEY_CTX_get0_pkey(pctx);
- if (!CMS_RecipientInfo_kari_get0_orig_id(ri, &talg, &pubkey,
- NULL, NULL, NULL))
- goto err;
- X509_ALGOR_get0(&aoid, NULL, NULL, talg);
- /* Is everything uninitialised? */
- if (aoid == OBJ_nid2obj(NID_undef)) {
-
- EC_KEY *eckey = pkey->pkey.ec;
- /* Set the key */
- unsigned char *p;
-
- penclen = i2o_ECPublicKey(eckey, NULL);
- if (penclen <= 0)
- goto err;
- penc = OPENSSL_malloc(penclen);
- if (penc == NULL)
- goto err;
- p = penc;
- penclen = i2o_ECPublicKey(eckey, &p);
- if (penclen <= 0)
- goto err;
- ASN1_STRING_set0(pubkey, penc, penclen);
- pubkey->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
- pubkey->flags |= ASN1_STRING_FLAG_BITS_LEFT;
-
- penc = NULL;
- X509_ALGOR_set0(talg, OBJ_nid2obj(NID_X9_62_id_ecPublicKey),
- V_ASN1_UNDEF, NULL);
- }
-
- /* See if custom parameters set */
- kdf_type = EVP_PKEY_CTX_get_ecdh_kdf_type(pctx);
- if (kdf_type <= 0)
- goto err;
- if (!EVP_PKEY_CTX_get_ecdh_kdf_md(pctx, &kdf_md))
- goto err;
- ecdh_nid = EVP_PKEY_CTX_get_ecdh_cofactor_mode(pctx);
- if (ecdh_nid < 0)
- goto err;
- else if (ecdh_nid == 0)
- ecdh_nid = NID_dh_std_kdf;
- else if (ecdh_nid == 1)
- ecdh_nid = NID_dh_cofactor_kdf;
-
- if (kdf_type == EVP_PKEY_ECDH_KDF_NONE) {
- kdf_type = EVP_PKEY_ECDH_KDF_X9_62;
- if (EVP_PKEY_CTX_set_ecdh_kdf_type(pctx, kdf_type) <= 0)
- goto err;
- } else
- /* Unknown KDF */
- goto err;
- if (kdf_md == NULL) {
- /* Fixme later for better MD */
- kdf_md = EVP_sha1();
- if (EVP_PKEY_CTX_set_ecdh_kdf_md(pctx, kdf_md) <= 0)
- goto err;
- }
-
- if (!CMS_RecipientInfo_kari_get0_alg(ri, &talg, &ukm))
- goto err;
-
- /* Lookup NID for KDF+cofactor+digest */
-
- if (!OBJ_find_sigid_by_algs(&kdf_nid, EVP_MD_type(kdf_md), ecdh_nid))
- goto err;
- /* Get wrap NID */
- ctx = CMS_RecipientInfo_kari_get0_ctx(ri);
- wrap_nid = EVP_CIPHER_CTX_type(ctx);
- keylen = EVP_CIPHER_CTX_key_length(ctx);
-
- /* Package wrap algorithm in an AlgorithmIdentifier */
-
- wrap_alg = X509_ALGOR_new();
- if (wrap_alg == NULL)
- goto err;
- wrap_alg->algorithm = OBJ_nid2obj(wrap_nid);
- wrap_alg->parameter = ASN1_TYPE_new();
- if (wrap_alg->parameter == NULL)
- goto err;
- if (EVP_CIPHER_param_to_asn1(ctx, wrap_alg->parameter) <= 0)
- goto err;
- if (ASN1_TYPE_get(wrap_alg->parameter) == NID_undef) {
- ASN1_TYPE_free(wrap_alg->parameter);
- wrap_alg->parameter = NULL;
- }
-
- if (EVP_PKEY_CTX_set_ecdh_kdf_outlen(pctx, keylen) <= 0)
- goto err;
-
- penclen = CMS_SharedInfo_encode(&penc, wrap_alg, ukm, keylen);
-
- if (!penclen)
- goto err;
-
- if (EVP_PKEY_CTX_set0_ecdh_kdf_ukm(pctx, penc, penclen) <= 0)
- goto err;
- penc = NULL;
-
- /*
- * Now need to wrap encoding of wrap AlgorithmIdentifier into parameter
- * of another AlgorithmIdentifier.
- */
- penclen = i2d_X509_ALGOR(wrap_alg, &penc);
- if (!penc || !penclen)
- goto err;
- wrap_str = ASN1_STRING_new();
- if (wrap_str == NULL)
- goto err;
- ASN1_STRING_set0(wrap_str, penc, penclen);
- penc = NULL;
- X509_ALGOR_set0(talg, OBJ_nid2obj(kdf_nid), V_ASN1_SEQUENCE, wrap_str);
-
- rv = 1;
-
- err:
- OPENSSL_free(penc);
- X509_ALGOR_free(wrap_alg);
- return rv;
-}
-
-#endif
projects / openssl.git / blobdiff