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82f52631b2
even when the public key is not present in an EC_KEY Reviewed-by: Stephen Henson <steve@openssl.org>
880 lines
23 KiB
C
880 lines
23 KiB
C
/*
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* Copyright 2006-2016 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <stdio.h>
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#include "internal/cryptlib.h"
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#include <openssl/x509.h>
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#include <openssl/ec.h>
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#include <openssl/bn.h>
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#include <openssl/cms.h>
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#include <openssl/asn1t.h>
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#include "internal/asn1_int.h"
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#include "internal/evp_int.h"
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#include "ec_lcl.h"
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#ifndef OPENSSL_NO_CMS
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static int ecdh_cms_decrypt(CMS_RecipientInfo *ri);
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static int ecdh_cms_encrypt(CMS_RecipientInfo *ri);
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#endif
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static int eckey_param2type(int *pptype, void **ppval, EC_KEY *ec_key)
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{
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const EC_GROUP *group;
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int nid;
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if (ec_key == NULL || (group = EC_KEY_get0_group(ec_key)) == NULL) {
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ECerr(EC_F_ECKEY_PARAM2TYPE, EC_R_MISSING_PARAMETERS);
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return 0;
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}
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if (EC_GROUP_get_asn1_flag(group)
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&& (nid = EC_GROUP_get_curve_name(group)))
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/* we have a 'named curve' => just set the OID */
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{
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*ppval = OBJ_nid2obj(nid);
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*pptype = V_ASN1_OBJECT;
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} else { /* explicit parameters */
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ASN1_STRING *pstr = NULL;
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pstr = ASN1_STRING_new();
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if (pstr == NULL)
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return 0;
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pstr->length = i2d_ECParameters(ec_key, &pstr->data);
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if (pstr->length <= 0) {
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ASN1_STRING_free(pstr);
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ECerr(EC_F_ECKEY_PARAM2TYPE, ERR_R_EC_LIB);
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return 0;
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}
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*ppval = pstr;
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*pptype = V_ASN1_SEQUENCE;
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}
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return 1;
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}
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static int eckey_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
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{
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EC_KEY *ec_key = pkey->pkey.ec;
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void *pval = NULL;
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int ptype;
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unsigned char *penc = NULL, *p;
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int penclen;
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if (!eckey_param2type(&ptype, &pval, ec_key)) {
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ECerr(EC_F_ECKEY_PUB_ENCODE, ERR_R_EC_LIB);
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return 0;
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}
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penclen = i2o_ECPublicKey(ec_key, NULL);
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if (penclen <= 0)
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goto err;
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penc = OPENSSL_malloc(penclen);
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if (penc == NULL)
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goto err;
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p = penc;
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penclen = i2o_ECPublicKey(ec_key, &p);
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if (penclen <= 0)
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goto err;
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if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(EVP_PKEY_EC),
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ptype, pval, penc, penclen))
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return 1;
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err:
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if (ptype == V_ASN1_OBJECT)
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ASN1_OBJECT_free(pval);
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else
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ASN1_STRING_free(pval);
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OPENSSL_free(penc);
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return 0;
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}
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static EC_KEY *eckey_type2param(int ptype, const void *pval)
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{
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EC_KEY *eckey = NULL;
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if (ptype == V_ASN1_SEQUENCE) {
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const ASN1_STRING *pstr = pval;
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const unsigned char *pm = NULL;
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int pmlen;
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pm = pstr->data;
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pmlen = pstr->length;
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if ((eckey = d2i_ECParameters(NULL, &pm, pmlen)) == NULL) {
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ECerr(EC_F_ECKEY_TYPE2PARAM, EC_R_DECODE_ERROR);
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goto ecerr;
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}
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} else if (ptype == V_ASN1_OBJECT) {
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const ASN1_OBJECT *poid = pval;
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EC_GROUP *group;
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/*
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* type == V_ASN1_OBJECT => the parameters are given by an asn1 OID
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*/
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if ((eckey = EC_KEY_new()) == NULL) {
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ECerr(EC_F_ECKEY_TYPE2PARAM, ERR_R_MALLOC_FAILURE);
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goto ecerr;
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}
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group = EC_GROUP_new_by_curve_name(OBJ_obj2nid(poid));
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if (group == NULL)
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goto ecerr;
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EC_GROUP_set_asn1_flag(group, OPENSSL_EC_NAMED_CURVE);
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if (EC_KEY_set_group(eckey, group) == 0)
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goto ecerr;
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EC_GROUP_free(group);
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} else {
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ECerr(EC_F_ECKEY_TYPE2PARAM, EC_R_DECODE_ERROR);
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goto ecerr;
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}
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return eckey;
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ecerr:
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EC_KEY_free(eckey);
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return NULL;
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}
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static int eckey_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey)
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{
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const unsigned char *p = NULL;
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const void *pval;
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int ptype, pklen;
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EC_KEY *eckey = NULL;
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X509_ALGOR *palg;
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if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey))
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return 0;
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X509_ALGOR_get0(NULL, &ptype, &pval, palg);
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eckey = eckey_type2param(ptype, pval);
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if (!eckey) {
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ECerr(EC_F_ECKEY_PUB_DECODE, ERR_R_EC_LIB);
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return 0;
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}
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/* We have parameters now set public key */
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if (!o2i_ECPublicKey(&eckey, &p, pklen)) {
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ECerr(EC_F_ECKEY_PUB_DECODE, EC_R_DECODE_ERROR);
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goto ecerr;
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}
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EVP_PKEY_assign_EC_KEY(pkey, eckey);
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return 1;
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ecerr:
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EC_KEY_free(eckey);
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return 0;
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}
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static int eckey_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
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{
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int r;
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const EC_GROUP *group = EC_KEY_get0_group(b->pkey.ec);
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const EC_POINT *pa = EC_KEY_get0_public_key(a->pkey.ec),
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*pb = EC_KEY_get0_public_key(b->pkey.ec);
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if (group == NULL || pa == NULL || pb == NULL)
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return -2;
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r = EC_POINT_cmp(group, pa, pb, NULL);
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if (r == 0)
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return 1;
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if (r == 1)
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return 0;
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return -2;
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}
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static int eckey_priv_decode(EVP_PKEY *pkey, const PKCS8_PRIV_KEY_INFO *p8)
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{
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const unsigned char *p = NULL;
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const void *pval;
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int ptype, pklen;
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EC_KEY *eckey = NULL;
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const X509_ALGOR *palg;
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if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8))
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return 0;
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X509_ALGOR_get0(NULL, &ptype, &pval, palg);
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eckey = eckey_type2param(ptype, pval);
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if (!eckey)
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goto ecliberr;
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/* We have parameters now set private key */
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if (!d2i_ECPrivateKey(&eckey, &p, pklen)) {
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ECerr(EC_F_ECKEY_PRIV_DECODE, EC_R_DECODE_ERROR);
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goto ecerr;
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}
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EVP_PKEY_assign_EC_KEY(pkey, eckey);
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return 1;
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ecliberr:
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ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
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ecerr:
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EC_KEY_free(eckey);
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return 0;
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}
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static int eckey_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
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{
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EC_KEY ec_key = *(pkey->pkey.ec);
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unsigned char *ep, *p;
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int eplen, ptype;
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void *pval;
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unsigned int old_flags;
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if (!eckey_param2type(&ptype, &pval, &ec_key)) {
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ECerr(EC_F_ECKEY_PRIV_ENCODE, EC_R_DECODE_ERROR);
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return 0;
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}
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/* set the private key */
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/*
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* do not include the parameters in the SEC1 private key see PKCS#11
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* 12.11
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*/
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old_flags = EC_KEY_get_enc_flags(&ec_key);
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EC_KEY_set_enc_flags(&ec_key, old_flags | EC_PKEY_NO_PARAMETERS);
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eplen = i2d_ECPrivateKey(&ec_key, NULL);
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if (!eplen) {
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ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_EC_LIB);
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return 0;
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}
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ep = OPENSSL_malloc(eplen);
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if (ep == NULL) {
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ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_MALLOC_FAILURE);
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return 0;
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}
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p = ep;
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if (!i2d_ECPrivateKey(&ec_key, &p)) {
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OPENSSL_free(ep);
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ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_EC_LIB);
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return 0;
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}
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if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_X9_62_id_ecPublicKey), 0,
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ptype, pval, ep, eplen))
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return 0;
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return 1;
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}
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static int int_ec_size(const EVP_PKEY *pkey)
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{
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return ECDSA_size(pkey->pkey.ec);
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}
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static int ec_bits(const EVP_PKEY *pkey)
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{
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return EC_GROUP_order_bits(EC_KEY_get0_group(pkey->pkey.ec));
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}
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static int ec_security_bits(const EVP_PKEY *pkey)
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{
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int ecbits = ec_bits(pkey);
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if (ecbits >= 512)
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return 256;
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if (ecbits >= 384)
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return 192;
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if (ecbits >= 256)
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return 128;
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if (ecbits >= 224)
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return 112;
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if (ecbits >= 160)
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return 80;
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return ecbits / 2;
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}
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static int ec_missing_parameters(const EVP_PKEY *pkey)
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{
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if (pkey->pkey.ec == NULL || EC_KEY_get0_group(pkey->pkey.ec) == NULL)
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return 1;
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return 0;
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}
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static int ec_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
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{
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EC_GROUP *group = EC_GROUP_dup(EC_KEY_get0_group(from->pkey.ec));
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if (group == NULL)
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return 0;
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if (to->pkey.ec == NULL) {
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to->pkey.ec = EC_KEY_new();
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if (to->pkey.ec == NULL)
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return 0;
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}
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if (EC_KEY_set_group(to->pkey.ec, group) == 0)
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return 0;
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EC_GROUP_free(group);
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return 1;
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}
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static int ec_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
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{
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const EC_GROUP *group_a = EC_KEY_get0_group(a->pkey.ec),
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*group_b = EC_KEY_get0_group(b->pkey.ec);
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if (group_a == NULL || group_b == NULL)
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return -2;
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if (EC_GROUP_cmp(group_a, group_b, NULL))
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return 0;
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else
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return 1;
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}
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static void int_ec_free(EVP_PKEY *pkey)
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{
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EC_KEY_free(pkey->pkey.ec);
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}
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typedef enum {
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EC_KEY_PRINT_PRIVATE,
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EC_KEY_PRINT_PUBLIC,
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EC_KEY_PRINT_PARAM
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} ec_print_t;
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static int do_EC_KEY_print(BIO *bp, const EC_KEY *x, int off, ec_print_t ktype)
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{
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const char *ecstr;
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unsigned char *priv = NULL, *pub = NULL;
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size_t privlen = 0, publen = 0;
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int ret = 0;
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const EC_GROUP *group;
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if (x == NULL || (group = EC_KEY_get0_group(x)) == NULL) {
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ECerr(EC_F_DO_EC_KEY_PRINT, ERR_R_PASSED_NULL_PARAMETER);
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return 0;
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}
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if (ktype != EC_KEY_PRINT_PARAM && EC_KEY_get0_public_key(x) != NULL) {
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publen = EC_KEY_key2buf(x, EC_KEY_get_conv_form(x), &pub, NULL);
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if (publen == 0)
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goto err;
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}
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if (ktype == EC_KEY_PRINT_PRIVATE && EC_KEY_get0_private_key(x) != NULL) {
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privlen = EC_KEY_priv2buf(x, &priv);
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if (privlen == 0)
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goto err;
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}
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if (ktype == EC_KEY_PRINT_PRIVATE)
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ecstr = "Private-Key";
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else if (ktype == EC_KEY_PRINT_PUBLIC)
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ecstr = "Public-Key";
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else
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ecstr = "ECDSA-Parameters";
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if (!BIO_indent(bp, off, 128))
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goto err;
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if (BIO_printf(bp, "%s: (%d bit)\n", ecstr,
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EC_GROUP_order_bits(group)) <= 0)
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goto err;
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if (privlen != 0) {
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if (BIO_printf(bp, "%*spriv:\n", off, "") <= 0)
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goto err;
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if (ASN1_buf_print(bp, priv, privlen, off + 4) == 0)
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goto err;
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}
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if (publen != 0) {
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if (BIO_printf(bp, "%*spub:\n", off, "") <= 0)
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goto err;
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if (ASN1_buf_print(bp, pub, publen, off + 4) == 0)
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goto err;
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}
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if (!ECPKParameters_print(bp, group, off))
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goto err;
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ret = 1;
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err:
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if (!ret)
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ECerr(EC_F_DO_EC_KEY_PRINT, ERR_R_EC_LIB);
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OPENSSL_clear_free(priv, privlen);
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OPENSSL_free(pub);
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return ret;
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}
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static int eckey_param_decode(EVP_PKEY *pkey,
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const unsigned char **pder, int derlen)
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{
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EC_KEY *eckey;
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if ((eckey = d2i_ECParameters(NULL, pder, derlen)) == NULL) {
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ECerr(EC_F_ECKEY_PARAM_DECODE, ERR_R_EC_LIB);
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return 0;
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}
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EVP_PKEY_assign_EC_KEY(pkey, eckey);
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return 1;
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}
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static int eckey_param_encode(const EVP_PKEY *pkey, unsigned char **pder)
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{
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return i2d_ECParameters(pkey->pkey.ec, pder);
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}
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static int eckey_param_print(BIO *bp, const EVP_PKEY *pkey, int indent,
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ASN1_PCTX *ctx)
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{
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return do_EC_KEY_print(bp, pkey->pkey.ec, indent, EC_KEY_PRINT_PARAM);
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}
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static int eckey_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent,
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ASN1_PCTX *ctx)
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{
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return do_EC_KEY_print(bp, pkey->pkey.ec, indent, EC_KEY_PRINT_PUBLIC);
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}
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static int eckey_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent,
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ASN1_PCTX *ctx)
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{
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return do_EC_KEY_print(bp, pkey->pkey.ec, indent, EC_KEY_PRINT_PRIVATE);
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}
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static int old_ec_priv_decode(EVP_PKEY *pkey,
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const unsigned char **pder, int derlen)
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{
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EC_KEY *ec;
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if ((ec = d2i_ECPrivateKey(NULL, pder, derlen)) == NULL) {
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ECerr(EC_F_OLD_EC_PRIV_DECODE, EC_R_DECODE_ERROR);
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return 0;
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}
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EVP_PKEY_assign_EC_KEY(pkey, ec);
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return 1;
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}
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static int old_ec_priv_encode(const EVP_PKEY *pkey, unsigned char **pder)
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{
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return i2d_ECPrivateKey(pkey->pkey.ec, pder);
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}
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static int ec_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
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{
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switch (op) {
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case ASN1_PKEY_CTRL_PKCS7_SIGN:
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if (arg1 == 0) {
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int snid, hnid;
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X509_ALGOR *alg1, *alg2;
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PKCS7_SIGNER_INFO_get0_algs(arg2, NULL, &alg1, &alg2);
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if (alg1 == NULL || alg1->algorithm == NULL)
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return -1;
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hnid = OBJ_obj2nid(alg1->algorithm);
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if (hnid == NID_undef)
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return -1;
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if (!OBJ_find_sigid_by_algs(&snid, hnid, EVP_PKEY_id(pkey)))
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return -1;
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X509_ALGOR_set0(alg2, OBJ_nid2obj(snid), V_ASN1_UNDEF, 0);
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}
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return 1;
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#ifndef OPENSSL_NO_CMS
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case ASN1_PKEY_CTRL_CMS_SIGN:
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if (arg1 == 0) {
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int snid, hnid;
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X509_ALGOR *alg1, *alg2;
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CMS_SignerInfo_get0_algs(arg2, NULL, NULL, &alg1, &alg2);
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if (alg1 == NULL || alg1->algorithm == NULL)
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return -1;
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hnid = OBJ_obj2nid(alg1->algorithm);
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if (hnid == NID_undef)
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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:
|
|
*(int *)arg2 = NID_sha256;
|
|
return 2;
|
|
|
|
case ASN1_PKEY_CTRL_SET1_TLS_ENCPT:
|
|
return EC_KEY_oct2key(EVP_PKEY_get0_EC_KEY(pkey), arg2, arg1, NULL);
|
|
|
|
case ASN1_PKEY_CTRL_GET1_TLS_ENCPT:
|
|
return EC_KEY_key2buf(EVP_PKEY_get0_EC_KEY(pkey),
|
|
POINT_CONVERSION_UNCOMPRESSED, arg2, NULL);
|
|
|
|
default:
|
|
return -2;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
const EVP_PKEY_ASN1_METHOD eckey_asn1_meth = {
|
|
EVP_PKEY_EC,
|
|
EVP_PKEY_EC,
|
|
0,
|
|
"EC",
|
|
"OpenSSL EC algorithm",
|
|
|
|
eckey_pub_decode,
|
|
eckey_pub_encode,
|
|
eckey_pub_cmp,
|
|
eckey_pub_print,
|
|
|
|
eckey_priv_decode,
|
|
eckey_priv_encode,
|
|
eckey_priv_print,
|
|
|
|
int_ec_size,
|
|
ec_bits,
|
|
ec_security_bits,
|
|
|
|
eckey_param_decode,
|
|
eckey_param_encode,
|
|
ec_missing_parameters,
|
|
ec_copy_parameters,
|
|
ec_cmp_parameters,
|
|
eckey_param_print,
|
|
0,
|
|
|
|
int_ec_free,
|
|
ec_pkey_ctrl,
|
|
old_ec_priv_decode,
|
|
old_ec_priv_encode
|
|
};
|
|
|
|
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, off,
|
|
private ? EC_KEY_PRINT_PRIVATE : EC_KEY_PRINT_PUBLIC);
|
|
}
|
|
|
|
int ECParameters_print(BIO *bp, const EC_KEY *x)
|
|
{
|
|
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
|