869 lines
22 KiB
C
869 lines
22 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/asn1.h>
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#include "dh_locl.h"
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#include <openssl/bn.h>
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#include "internal/asn1_int.h"
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#include "internal/evp_int.h"
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#include <openssl/cms.h>
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/*
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* i2d/d2i like DH parameter functions which use the appropriate routine for
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* PKCS#3 DH or X9.42 DH.
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*/
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static DH *d2i_dhp(const EVP_PKEY *pkey, const unsigned char **pp,
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long length)
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{
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if (pkey->ameth == &dhx_asn1_meth)
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return d2i_DHxparams(NULL, pp, length);
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return d2i_DHparams(NULL, pp, length);
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}
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static int i2d_dhp(const EVP_PKEY *pkey, const DH *a, unsigned char **pp)
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{
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if (pkey->ameth == &dhx_asn1_meth)
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return i2d_DHxparams(a, pp);
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return i2d_DHparams(a, pp);
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}
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static void int_dh_free(EVP_PKEY *pkey)
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{
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DH_free(pkey->pkey.dh);
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}
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static int dh_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey)
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{
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const unsigned char *p, *pm;
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int pklen, pmlen;
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int ptype;
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void *pval;
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ASN1_STRING *pstr;
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X509_ALGOR *palg;
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ASN1_INTEGER *public_key = NULL;
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DH *dh = NULL;
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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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if (ptype != V_ASN1_SEQUENCE) {
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DHerr(DH_F_DH_PUB_DECODE, DH_R_PARAMETER_ENCODING_ERROR);
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goto err;
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}
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pstr = pval;
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pm = pstr->data;
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pmlen = pstr->length;
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if ((dh = d2i_dhp(pkey, &pm, pmlen)) == NULL) {
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DHerr(DH_F_DH_PUB_DECODE, DH_R_DECODE_ERROR);
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goto err;
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}
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if ((public_key = d2i_ASN1_INTEGER(NULL, &p, pklen)) == NULL) {
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DHerr(DH_F_DH_PUB_DECODE, DH_R_DECODE_ERROR);
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goto err;
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}
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/* We have parameters now set public key */
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if ((dh->pub_key = ASN1_INTEGER_to_BN(public_key, NULL)) == NULL) {
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DHerr(DH_F_DH_PUB_DECODE, DH_R_BN_DECODE_ERROR);
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goto err;
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}
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ASN1_INTEGER_free(public_key);
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EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, dh);
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return 1;
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err:
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ASN1_INTEGER_free(public_key);
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DH_free(dh);
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return 0;
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}
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static int dh_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
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{
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DH *dh;
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int ptype;
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unsigned char *penc = NULL;
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int penclen;
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ASN1_STRING *str;
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ASN1_INTEGER *pub_key = NULL;
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dh = pkey->pkey.dh;
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str = ASN1_STRING_new();
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if (str == NULL) {
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DHerr(DH_F_DH_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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str->length = i2d_dhp(pkey, dh, &str->data);
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if (str->length <= 0) {
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DHerr(DH_F_DH_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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ptype = V_ASN1_SEQUENCE;
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pub_key = BN_to_ASN1_INTEGER(dh->pub_key, NULL);
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if (!pub_key)
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goto err;
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penclen = i2d_ASN1_INTEGER(pub_key, &penc);
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ASN1_INTEGER_free(pub_key);
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if (penclen <= 0) {
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DHerr(DH_F_DH_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(pkey->ameth->pkey_id),
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ptype, str, penc, penclen))
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return 1;
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err:
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OPENSSL_free(penc);
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ASN1_STRING_free(str);
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return 0;
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}
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/*
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* PKCS#8 DH is defined in PKCS#11 of all places. It is similar to DH in that
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* the AlgorithmIdentifier contains the parameters, the private key is
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* explicitly included and the pubkey must be recalculated.
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*/
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static int dh_priv_decode(EVP_PKEY *pkey, PKCS8_PRIV_KEY_INFO *p8)
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{
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const unsigned char *p, *pm;
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int pklen, pmlen;
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int ptype;
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void *pval;
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ASN1_STRING *pstr;
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X509_ALGOR *palg;
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ASN1_INTEGER *privkey = NULL;
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DH *dh = NULL;
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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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if (ptype != V_ASN1_SEQUENCE)
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goto decerr;
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if ((privkey = d2i_ASN1_INTEGER(NULL, &p, pklen)) == NULL)
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goto decerr;
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pstr = pval;
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pm = pstr->data;
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pmlen = pstr->length;
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if ((dh = d2i_dhp(pkey, &pm, pmlen)) == NULL)
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goto decerr;
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/* We have parameters now set private key */
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if ((dh->priv_key = BN_secure_new()) == NULL
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|| !ASN1_INTEGER_to_BN(privkey, dh->priv_key)) {
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DHerr(DH_F_DH_PRIV_DECODE, DH_R_BN_ERROR);
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goto dherr;
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}
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/* Calculate public key */
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if (!DH_generate_key(dh))
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goto dherr;
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EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, dh);
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ASN1_STRING_clear_free(privkey);
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return 1;
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decerr:
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DHerr(DH_F_DH_PRIV_DECODE, EVP_R_DECODE_ERROR);
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dherr:
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DH_free(dh);
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ASN1_STRING_clear_free(privkey);
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return 0;
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}
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static int dh_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
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{
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ASN1_STRING *params = NULL;
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ASN1_INTEGER *prkey = NULL;
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unsigned char *dp = NULL;
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int dplen;
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params = ASN1_STRING_new();
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if (params == NULL) {
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DHerr(DH_F_DH_PRIV_ENCODE, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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params->length = i2d_dhp(pkey, pkey->pkey.dh, ¶ms->data);
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if (params->length <= 0) {
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DHerr(DH_F_DH_PRIV_ENCODE, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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params->type = V_ASN1_SEQUENCE;
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/* Get private key into integer */
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prkey = BN_to_ASN1_INTEGER(pkey->pkey.dh->priv_key, NULL);
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if (!prkey) {
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DHerr(DH_F_DH_PRIV_ENCODE, DH_R_BN_ERROR);
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goto err;
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}
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dplen = i2d_ASN1_INTEGER(prkey, &dp);
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ASN1_STRING_clear_free(prkey);
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prkey = NULL;
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if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(pkey->ameth->pkey_id), 0,
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V_ASN1_SEQUENCE, params, dp, dplen))
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goto err;
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return 1;
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err:
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OPENSSL_free(dp);
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ASN1_STRING_free(params);
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ASN1_STRING_clear_free(prkey);
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return 0;
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}
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static int dh_param_decode(EVP_PKEY *pkey,
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const unsigned char **pder, int derlen)
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{
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DH *dh;
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if ((dh = d2i_dhp(pkey, pder, derlen)) == NULL) {
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DHerr(DH_F_DH_PARAM_DECODE, ERR_R_DH_LIB);
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return 0;
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}
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EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, dh);
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return 1;
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}
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static int dh_param_encode(const EVP_PKEY *pkey, unsigned char **pder)
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{
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return i2d_dhp(pkey, pkey->pkey.dh, pder);
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}
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static int do_dh_print(BIO *bp, const DH *x, int indent, int ptype)
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{
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int reason = ERR_R_BUF_LIB;
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const char *ktype = NULL;
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BIGNUM *priv_key, *pub_key;
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if (ptype == 2)
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priv_key = x->priv_key;
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else
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priv_key = NULL;
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if (ptype > 0)
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pub_key = x->pub_key;
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else
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pub_key = NULL;
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if (priv_key == NULL && pub_key == NULL) {
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reason = ERR_R_PASSED_NULL_PARAMETER;
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goto err;
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}
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if (ptype == 2)
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ktype = "DH Private-Key";
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else if (ptype == 1)
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ktype = "DH Public-Key";
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else
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ktype = "DH Parameters";
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BIO_indent(bp, indent, 128);
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if (BIO_printf(bp, "%s: (%d bit)\n", ktype, BN_num_bits(x->p)) <= 0)
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goto err;
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indent += 4;
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if (!ASN1_bn_print(bp, "private-key:", priv_key, NULL, indent))
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goto err;
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if (!ASN1_bn_print(bp, "public-key:", pub_key, NULL, indent))
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goto err;
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if (!ASN1_bn_print(bp, "prime:", x->p, NULL, indent))
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goto err;
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if (!ASN1_bn_print(bp, "generator:", x->g, NULL, indent))
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goto err;
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if (x->q && !ASN1_bn_print(bp, "subgroup order:", x->q, NULL, indent))
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goto err;
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if (x->j && !ASN1_bn_print(bp, "subgroup factor:", x->j, NULL, indent))
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goto err;
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if (x->seed) {
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int i;
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BIO_indent(bp, indent, 128);
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BIO_puts(bp, "seed:");
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for (i = 0; i < x->seedlen; i++) {
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if ((i % 15) == 0) {
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if (BIO_puts(bp, "\n") <= 0
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|| !BIO_indent(bp, indent + 4, 128))
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goto err;
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}
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if (BIO_printf(bp, "%02x%s", x->seed[i],
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((i + 1) == x->seedlen) ? "" : ":") <= 0)
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goto err;
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}
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if (BIO_write(bp, "\n", 1) <= 0)
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return (0);
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}
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if (x->counter && !ASN1_bn_print(bp, "counter:", x->counter, NULL, indent))
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goto err;
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if (x->length != 0) {
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BIO_indent(bp, indent, 128);
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if (BIO_printf(bp, "recommended-private-length: %d bits\n",
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(int)x->length) <= 0)
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goto err;
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}
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return 1;
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err:
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DHerr(DH_F_DO_DH_PRINT, reason);
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return 0;
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}
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static int int_dh_size(const EVP_PKEY *pkey)
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{
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return (DH_size(pkey->pkey.dh));
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}
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static int dh_bits(const EVP_PKEY *pkey)
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{
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return BN_num_bits(pkey->pkey.dh->p);
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}
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static int dh_security_bits(const EVP_PKEY *pkey)
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{
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return DH_security_bits(pkey->pkey.dh);
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}
|
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|
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static int dh_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
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{
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if (BN_cmp(a->pkey.dh->p, b->pkey.dh->p) ||
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BN_cmp(a->pkey.dh->g, b->pkey.dh->g))
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return 0;
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else if (a->ameth == &dhx_asn1_meth) {
|
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if (BN_cmp(a->pkey.dh->q, b->pkey.dh->q))
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return 0;
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}
|
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return 1;
|
|
}
|
|
|
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static int int_dh_bn_cpy(BIGNUM **dst, const BIGNUM *src)
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{
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BIGNUM *a;
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if (src) {
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a = BN_dup(src);
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if (!a)
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return 0;
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} else
|
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a = NULL;
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BN_free(*dst);
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*dst = a;
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return 1;
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}
|
|
|
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static int int_dh_param_copy(DH *to, const DH *from, int is_x942)
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|
{
|
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if (is_x942 == -1)
|
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is_x942 = ! !from->q;
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if (!int_dh_bn_cpy(&to->p, from->p))
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return 0;
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if (!int_dh_bn_cpy(&to->g, from->g))
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return 0;
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if (is_x942) {
|
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if (!int_dh_bn_cpy(&to->q, from->q))
|
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return 0;
|
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if (!int_dh_bn_cpy(&to->j, from->j))
|
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return 0;
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OPENSSL_free(to->seed);
|
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to->seed = NULL;
|
|
to->seedlen = 0;
|
|
if (from->seed) {
|
|
to->seed = OPENSSL_memdup(from->seed, from->seedlen);
|
|
if (!to->seed)
|
|
return 0;
|
|
to->seedlen = from->seedlen;
|
|
}
|
|
} else
|
|
to->length = from->length;
|
|
return 1;
|
|
}
|
|
|
|
DH *DHparams_dup(DH *dh)
|
|
{
|
|
DH *ret;
|
|
ret = DH_new();
|
|
if (ret == NULL)
|
|
return NULL;
|
|
if (!int_dh_param_copy(ret, dh, -1)) {
|
|
DH_free(ret);
|
|
return NULL;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int dh_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
|
|
{
|
|
if (to->pkey.dh == NULL) {
|
|
to->pkey.dh = DH_new();
|
|
if (to->pkey.dh == NULL)
|
|
return 0;
|
|
}
|
|
return int_dh_param_copy(to->pkey.dh, from->pkey.dh,
|
|
from->ameth == &dhx_asn1_meth);
|
|
}
|
|
|
|
static int dh_missing_parameters(const EVP_PKEY *a)
|
|
{
|
|
if (!a->pkey.dh->p || !a->pkey.dh->g)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static int dh_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
|
|
{
|
|
if (dh_cmp_parameters(a, b) == 0)
|
|
return 0;
|
|
if (BN_cmp(b->pkey.dh->pub_key, a->pkey.dh->pub_key) != 0)
|
|
return 0;
|
|
else
|
|
return 1;
|
|
}
|
|
|
|
static int dh_param_print(BIO *bp, const EVP_PKEY *pkey, int indent,
|
|
ASN1_PCTX *ctx)
|
|
{
|
|
return do_dh_print(bp, pkey->pkey.dh, indent, 0);
|
|
}
|
|
|
|
static int dh_public_print(BIO *bp, const EVP_PKEY *pkey, int indent,
|
|
ASN1_PCTX *ctx)
|
|
{
|
|
return do_dh_print(bp, pkey->pkey.dh, indent, 1);
|
|
}
|
|
|
|
static int dh_private_print(BIO *bp, const EVP_PKEY *pkey, int indent,
|
|
ASN1_PCTX *ctx)
|
|
{
|
|
return do_dh_print(bp, pkey->pkey.dh, indent, 2);
|
|
}
|
|
|
|
int DHparams_print(BIO *bp, const DH *x)
|
|
{
|
|
return do_dh_print(bp, x, 4, 0);
|
|
}
|
|
|
|
#ifndef OPENSSL_NO_CMS
|
|
static int dh_cms_decrypt(CMS_RecipientInfo *ri);
|
|
static int dh_cms_encrypt(CMS_RecipientInfo *ri);
|
|
#endif
|
|
|
|
static int dh_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
|
|
{
|
|
switch (op) {
|
|
#ifndef OPENSSL_NO_CMS
|
|
|
|
case ASN1_PKEY_CTRL_CMS_ENVELOPE:
|
|
if (arg1 == 1)
|
|
return dh_cms_decrypt(arg2);
|
|
else if (arg1 == 0)
|
|
return dh_cms_encrypt(arg2);
|
|
return -2;
|
|
|
|
case ASN1_PKEY_CTRL_CMS_RI_TYPE:
|
|
*(int *)arg2 = CMS_RECIPINFO_AGREE;
|
|
return 1;
|
|
#endif
|
|
default:
|
|
return -2;
|
|
}
|
|
|
|
}
|
|
|
|
const EVP_PKEY_ASN1_METHOD dh_asn1_meth = {
|
|
EVP_PKEY_DH,
|
|
EVP_PKEY_DH,
|
|
0,
|
|
|
|
"DH",
|
|
"OpenSSL PKCS#3 DH method",
|
|
|
|
dh_pub_decode,
|
|
dh_pub_encode,
|
|
dh_pub_cmp,
|
|
dh_public_print,
|
|
|
|
dh_priv_decode,
|
|
dh_priv_encode,
|
|
dh_private_print,
|
|
|
|
int_dh_size,
|
|
dh_bits,
|
|
dh_security_bits,
|
|
|
|
dh_param_decode,
|
|
dh_param_encode,
|
|
dh_missing_parameters,
|
|
dh_copy_parameters,
|
|
dh_cmp_parameters,
|
|
dh_param_print,
|
|
0,
|
|
|
|
int_dh_free,
|
|
0
|
|
};
|
|
|
|
const EVP_PKEY_ASN1_METHOD dhx_asn1_meth = {
|
|
EVP_PKEY_DHX,
|
|
EVP_PKEY_DHX,
|
|
0,
|
|
|
|
"X9.42 DH",
|
|
"OpenSSL X9.42 DH method",
|
|
|
|
dh_pub_decode,
|
|
dh_pub_encode,
|
|
dh_pub_cmp,
|
|
dh_public_print,
|
|
|
|
dh_priv_decode,
|
|
dh_priv_encode,
|
|
dh_private_print,
|
|
|
|
int_dh_size,
|
|
dh_bits,
|
|
dh_security_bits,
|
|
|
|
dh_param_decode,
|
|
dh_param_encode,
|
|
dh_missing_parameters,
|
|
dh_copy_parameters,
|
|
dh_cmp_parameters,
|
|
dh_param_print,
|
|
0,
|
|
|
|
int_dh_free,
|
|
dh_pkey_ctrl
|
|
};
|
|
|
|
#ifndef OPENSSL_NO_CMS
|
|
|
|
static int dh_cms_set_peerkey(EVP_PKEY_CTX *pctx,
|
|
X509_ALGOR *alg, ASN1_BIT_STRING *pubkey)
|
|
{
|
|
ASN1_OBJECT *aoid;
|
|
int atype;
|
|
void *aval;
|
|
ASN1_INTEGER *public_key = NULL;
|
|
int rv = 0;
|
|
EVP_PKEY *pkpeer = NULL, *pk = NULL;
|
|
DH *dhpeer = NULL;
|
|
const unsigned char *p;
|
|
int plen;
|
|
|
|
X509_ALGOR_get0(&aoid, &atype, &aval, alg);
|
|
if (OBJ_obj2nid(aoid) != NID_dhpublicnumber)
|
|
goto err;
|
|
/* Only absent parameters allowed in RFC XXXX */
|
|
if (atype != V_ASN1_UNDEF && atype == V_ASN1_NULL)
|
|
goto err;
|
|
|
|
pk = EVP_PKEY_CTX_get0_pkey(pctx);
|
|
if (!pk)
|
|
goto err;
|
|
if (pk->type != EVP_PKEY_DHX)
|
|
goto err;
|
|
/* Get parameters from parent key */
|
|
dhpeer = DHparams_dup(pk->pkey.dh);
|
|
/* We have parameters now set public key */
|
|
plen = ASN1_STRING_length(pubkey);
|
|
p = ASN1_STRING_data(pubkey);
|
|
if (!p || !plen)
|
|
goto err;
|
|
|
|
if ((public_key = d2i_ASN1_INTEGER(NULL, &p, plen)) == NULL) {
|
|
DHerr(DH_F_DH_CMS_SET_PEERKEY, DH_R_DECODE_ERROR);
|
|
goto err;
|
|
}
|
|
|
|
/* We have parameters now set public key */
|
|
if ((dhpeer->pub_key = ASN1_INTEGER_to_BN(public_key, NULL)) == NULL) {
|
|
DHerr(DH_F_DH_CMS_SET_PEERKEY, DH_R_BN_DECODE_ERROR);
|
|
goto err;
|
|
}
|
|
|
|
pkpeer = EVP_PKEY_new();
|
|
if (pkpeer == NULL)
|
|
goto err;
|
|
EVP_PKEY_assign(pkpeer, pk->ameth->pkey_id, dhpeer);
|
|
dhpeer = NULL;
|
|
if (EVP_PKEY_derive_set_peer(pctx, pkpeer) > 0)
|
|
rv = 1;
|
|
err:
|
|
ASN1_INTEGER_free(public_key);
|
|
EVP_PKEY_free(pkpeer);
|
|
DH_free(dhpeer);
|
|
return rv;
|
|
}
|
|
|
|
static int dh_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 *dukm = NULL;
|
|
size_t dukmlen = 0;
|
|
int keylen, plen;
|
|
const EVP_CIPHER *kekcipher;
|
|
EVP_CIPHER_CTX *kekctx;
|
|
|
|
if (!CMS_RecipientInfo_kari_get0_alg(ri, &alg, &ukm))
|
|
goto err;
|
|
|
|
/*
|
|
* For DH we only have one OID permissible. If ever any more get defined
|
|
* we will need something cleverer.
|
|
*/
|
|
if (OBJ_obj2nid(alg->algorithm) != NID_id_smime_alg_ESDH) {
|
|
DHerr(DH_F_DH_CMS_SET_SHARED_INFO, DH_R_KDF_PARAMETER_ERROR);
|
|
goto err;
|
|
}
|
|
|
|
if (EVP_PKEY_CTX_set_dh_kdf_type(pctx, EVP_PKEY_DH_KDF_X9_42) <= 0)
|
|
goto err;
|
|
|
|
if (EVP_PKEY_CTX_set_dh_kdf_md(pctx, EVP_sha1()) <= 0)
|
|
goto err;
|
|
|
|
if (alg->parameter->type != V_ASN1_SEQUENCE)
|
|
goto err;
|
|
|
|
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_dh_kdf_outlen(pctx, keylen) <= 0)
|
|
goto err;
|
|
/* Use OBJ_nid2obj to ensure we use built in OID that isn't freed */
|
|
if (EVP_PKEY_CTX_set0_dh_kdf_oid(pctx,
|
|
OBJ_nid2obj(EVP_CIPHER_type(kekcipher)))
|
|
<= 0)
|
|
goto err;
|
|
|
|
if (ukm) {
|
|
dukmlen = ASN1_STRING_length(ukm);
|
|
dukm = OPENSSL_memdup(ASN1_STRING_data(ukm), dukmlen);
|
|
if (!dukm)
|
|
goto err;
|
|
}
|
|
|
|
if (EVP_PKEY_CTX_set0_dh_kdf_ukm(pctx, dukm, dukmlen) <= 0)
|
|
goto err;
|
|
dukm = NULL;
|
|
|
|
rv = 1;
|
|
err:
|
|
X509_ALGOR_free(kekalg);
|
|
OPENSSL_free(dukm);
|
|
return rv;
|
|
}
|
|
|
|
static int dh_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 (!dh_cms_set_peerkey(pctx, alg, pubkey)) {
|
|
DHerr(DH_F_DH_CMS_DECRYPT, DH_R_PEER_KEY_ERROR);
|
|
return 0;
|
|
}
|
|
}
|
|
/* Set DH derivation parameters and initialise unwrap context */
|
|
if (!dh_cms_set_shared_info(pctx, ri)) {
|
|
DHerr(DH_F_DH_CMS_DECRYPT, DH_R_SHARED_INFO_ERROR);
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static int dh_cms_encrypt(CMS_RecipientInfo *ri)
|
|
{
|
|
EVP_PKEY_CTX *pctx;
|
|
EVP_PKEY *pkey;
|
|
EVP_CIPHER_CTX *ctx;
|
|
int keylen;
|
|
X509_ALGOR *talg, *wrap_alg = NULL;
|
|
ASN1_OBJECT *aoid;
|
|
ASN1_BIT_STRING *pubkey;
|
|
ASN1_STRING *wrap_str;
|
|
ASN1_OCTET_STRING *ukm;
|
|
unsigned char *penc = NULL, *dukm = NULL;
|
|
int penclen;
|
|
size_t dukmlen = 0;
|
|
int rv = 0;
|
|
int kdf_type, 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)) {
|
|
ASN1_INTEGER *pubk = BN_to_ASN1_INTEGER(pkey->pkey.dh->pub_key, NULL);
|
|
if (!pubk)
|
|
goto err;
|
|
/* Set the key */
|
|
|
|
penclen = i2d_ASN1_INTEGER(pubk, &penc);
|
|
ASN1_INTEGER_free(pubk);
|
|
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_dhpublicnumber),
|
|
V_ASN1_UNDEF, NULL);
|
|
}
|
|
|
|
/* See if custom parameters set */
|
|
kdf_type = EVP_PKEY_CTX_get_dh_kdf_type(pctx);
|
|
if (kdf_type <= 0)
|
|
goto err;
|
|
if (!EVP_PKEY_CTX_get_dh_kdf_md(pctx, &kdf_md))
|
|
goto err;
|
|
|
|
if (kdf_type == EVP_PKEY_DH_KDF_NONE) {
|
|
kdf_type = EVP_PKEY_DH_KDF_X9_42;
|
|
if (EVP_PKEY_CTX_set_dh_kdf_type(pctx, kdf_type) <= 0)
|
|
goto err;
|
|
} else if (kdf_type != EVP_PKEY_DH_KDF_X9_42)
|
|
/* Unknown KDF */
|
|
goto err;
|
|
if (kdf_md == NULL) {
|
|
/* Only SHA1 supported */
|
|
kdf_md = EVP_sha1();
|
|
if (EVP_PKEY_CTX_set_dh_kdf_md(pctx, kdf_md) <= 0)
|
|
goto err;
|
|
} else if (EVP_MD_type(kdf_md) != NID_sha1)
|
|
/* Unsupported digest */
|
|
goto err;
|
|
|
|
if (!CMS_RecipientInfo_kari_get0_alg(ri, &talg, &ukm))
|
|
goto err;
|
|
|
|
/* Get wrap NID */
|
|
ctx = CMS_RecipientInfo_kari_get0_ctx(ri);
|
|
wrap_nid = EVP_CIPHER_CTX_type(ctx);
|
|
if (EVP_PKEY_CTX_set0_dh_kdf_oid(pctx, OBJ_nid2obj(wrap_nid)) <= 0)
|
|
goto err;
|
|
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_dh_kdf_outlen(pctx, keylen) <= 0)
|
|
goto err;
|
|
|
|
if (ukm) {
|
|
dukmlen = ASN1_STRING_length(ukm);
|
|
dukm = OPENSSL_memdup(ASN1_STRING_data(ukm), dukmlen);
|
|
if (!dukm)
|
|
goto err;
|
|
}
|
|
|
|
if (EVP_PKEY_CTX_set0_dh_kdf_ukm(pctx, dukm, dukmlen) <= 0)
|
|
goto err;
|
|
dukm = NULL;
|
|
|
|
/*
|
|
* Now need to wrap encoding of wrap AlgorithmIdentifier into parameter
|
|
* of another AlgorithmIdentifier.
|
|
*/
|
|
penc = NULL;
|
|
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(NID_id_smime_alg_ESDH),
|
|
V_ASN1_SEQUENCE, wrap_str);
|
|
|
|
rv = 1;
|
|
|
|
err:
|
|
OPENSSL_free(penc);
|
|
X509_ALGOR_free(wrap_alg);
|
|
return rv;
|
|
}
|
|
|
|
#endif
|