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openssl/crypto/crmf/crmf_lib.c
Dr. David von Oheimb 36b91a198a CMS, PKCS7, and CRMF: simplify use of EVP_PKEY_decrypt() by helper function 
Also remove needless constant_time_* and ERR_clear_error() calls
from OSSL_CRMF_ENCRYPTEDVALUE_get1_encCert().

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Dmitry Belyavskiy <beldmit@gmail.com>
Reviewed-by: David von Oheimb <david.von.oheimb@siemens.com>
(Merged from https://github.com/openssl/openssl/pull/17354)
2023-05-30 22:02:10 +02:00

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/*-
* Copyright 2007-2021 The OpenSSL Project Authors. All Rights Reserved.
* Copyright Nokia 2007-2018
* Copyright Siemens AG 2015-2019
*
* 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
*
* CRMF implementation by Martin Peylo, Miikka Viljanen, and David von Oheimb.
*/
/*
* This file contains the functions that handle the individual items inside
* the CRMF structures
*/
/*
* NAMING
*
* The 0 functions use the supplied structure pointer directly in the parent and
* it will be freed up when the parent is freed.
*
* The 1 functions use a copy of the supplied structure pointer (or in some
* cases increases its link count) in the parent and so both should be freed up.
*/
#include <openssl/asn1t.h>
#include "crmf_local.h"
#include "internal/sizes.h"
#include "crypto/evp.h"
#include "crypto/x509.h"
/* explicit #includes not strictly needed since implied by the above: */
#include <openssl/crmf.h>
#include <openssl/err.h>
#include <openssl/evp.h>
/*-
* atyp = Attribute Type
* valt = Value Type
* ctrlinf = "regCtrl" or "regInfo"
*/
#define IMPLEMENT_CRMF_CTRL_FUNC(atyp, valt, ctrlinf) \
valt *OSSL_CRMF_MSG_get0_##ctrlinf##_##atyp(const OSSL_CRMF_MSG *msg) \
{ \
int i; \
STACK_OF(OSSL_CRMF_ATTRIBUTETYPEANDVALUE) *controls; \
OSSL_CRMF_ATTRIBUTETYPEANDVALUE *atav = NULL; \
\
if (msg == NULL || msg->certReq == NULL) \
return NULL; \
controls = msg->certReq->controls; \
for (i = 0; i < sk_OSSL_CRMF_ATTRIBUTETYPEANDVALUE_num(controls); i++) { \
atav = sk_OSSL_CRMF_ATTRIBUTETYPEANDVALUE_value(controls, i); \
if (OBJ_obj2nid(atav->type) == NID_id_##ctrlinf##_##atyp) \
return atav->value.atyp; \
} \
return NULL; \
} \
\
int OSSL_CRMF_MSG_set1_##ctrlinf##_##atyp(OSSL_CRMF_MSG *msg, const valt *in) \
{ \
OSSL_CRMF_ATTRIBUTETYPEANDVALUE *atav = NULL; \
\
if (msg == NULL || in == NULL) \
goto err; \
if ((atav = OSSL_CRMF_ATTRIBUTETYPEANDVALUE_new()) == NULL) \
goto err; \
if ((atav->type = OBJ_nid2obj(NID_id_##ctrlinf##_##atyp)) == NULL) \
goto err; \
if ((atav->value.atyp = valt##_dup(in)) == NULL) \
goto err; \
if (!OSSL_CRMF_MSG_push0_##ctrlinf(msg, atav)) \
goto err; \
return 1; \
err: \
OSSL_CRMF_ATTRIBUTETYPEANDVALUE_free(atav); \
return 0; \
}
/*-
* Pushes the given control attribute into the controls stack of a CertRequest
* (section 6)
* returns 1 on success, 0 on error
*/
static int OSSL_CRMF_MSG_push0_regCtrl(OSSL_CRMF_MSG *crm,
OSSL_CRMF_ATTRIBUTETYPEANDVALUE *ctrl)
{
int new = 0;
if (crm == NULL || crm->certReq == NULL || ctrl == NULL) {
ERR_raise(ERR_LIB_CRMF, CRMF_R_NULL_ARGUMENT);
return 0;
}
if (crm->certReq->controls == NULL) {
crm->certReq->controls = sk_OSSL_CRMF_ATTRIBUTETYPEANDVALUE_new_null();
if (crm->certReq->controls == NULL)
goto err;
new = 1;
}
if (!sk_OSSL_CRMF_ATTRIBUTETYPEANDVALUE_push(crm->certReq->controls, ctrl))
goto err;
return 1;
err:
if (new != 0) {
sk_OSSL_CRMF_ATTRIBUTETYPEANDVALUE_free(crm->certReq->controls);
crm->certReq->controls = NULL;
}
return 0;
}
/* id-regCtrl-regToken Control (section 6.1) */
IMPLEMENT_CRMF_CTRL_FUNC(regToken, ASN1_STRING, regCtrl)
/* id-regCtrl-authenticator Control (section 6.2) */
#define ASN1_UTF8STRING_dup ASN1_STRING_dup
IMPLEMENT_CRMF_CTRL_FUNC(authenticator, ASN1_UTF8STRING, regCtrl)
int OSSL_CRMF_MSG_set0_SinglePubInfo(OSSL_CRMF_SINGLEPUBINFO *spi,
int method, GENERAL_NAME *nm)
{
if (spi == NULL
|| method < OSSL_CRMF_PUB_METHOD_DONTCARE
|| method > OSSL_CRMF_PUB_METHOD_LDAP) {
ERR_raise(ERR_LIB_CRMF, ERR_R_PASSED_INVALID_ARGUMENT);
return 0;
}
if (!ASN1_INTEGER_set(spi->pubMethod, method))
return 0;
GENERAL_NAME_free(spi->pubLocation);
spi->pubLocation = nm;
return 1;
}
int
OSSL_CRMF_MSG_PKIPublicationInfo_push0_SinglePubInfo(OSSL_CRMF_PKIPUBLICATIONINFO *pi,
OSSL_CRMF_SINGLEPUBINFO *spi)
{
if (pi == NULL || spi == NULL) {
ERR_raise(ERR_LIB_CRMF, CRMF_R_NULL_ARGUMENT);
return 0;
}
if (pi->pubInfos == NULL)
pi->pubInfos = sk_OSSL_CRMF_SINGLEPUBINFO_new_null();
if (pi->pubInfos == NULL)
return 0;
return sk_OSSL_CRMF_SINGLEPUBINFO_push(pi->pubInfos, spi);
}
int OSSL_CRMF_MSG_set_PKIPublicationInfo_action(OSSL_CRMF_PKIPUBLICATIONINFO *pi,
int action)
{
if (pi == NULL
|| action < OSSL_CRMF_PUB_ACTION_DONTPUBLISH
|| action > OSSL_CRMF_PUB_ACTION_PLEASEPUBLISH) {
ERR_raise(ERR_LIB_CRMF, ERR_R_PASSED_INVALID_ARGUMENT);
return 0;
}
return ASN1_INTEGER_set(pi->action, action);
}
/* id-regCtrl-pkiPublicationInfo Control (section 6.3) */
IMPLEMENT_CRMF_CTRL_FUNC(pkiPublicationInfo, OSSL_CRMF_PKIPUBLICATIONINFO,
regCtrl)
/* id-regCtrl-oldCertID Control (section 6.5) from the given */
IMPLEMENT_CRMF_CTRL_FUNC(oldCertID, OSSL_CRMF_CERTID, regCtrl)
OSSL_CRMF_CERTID *OSSL_CRMF_CERTID_gen(const X509_NAME *issuer,
const ASN1_INTEGER *serial)
{
OSSL_CRMF_CERTID *cid = NULL;
if (issuer == NULL || serial == NULL) {
ERR_raise(ERR_LIB_CRMF, CRMF_R_NULL_ARGUMENT);
return NULL;
}
if ((cid = OSSL_CRMF_CERTID_new()) == NULL)
goto err;
if (!X509_NAME_set(&cid->issuer->d.directoryName, issuer))
goto err;
cid->issuer->type = GEN_DIRNAME;
ASN1_INTEGER_free(cid->serialNumber);
if ((cid->serialNumber = ASN1_INTEGER_dup(serial)) == NULL)
goto err;
return cid;
err:
OSSL_CRMF_CERTID_free(cid);
return NULL;
}
/*
* id-regCtrl-protocolEncrKey Control (section 6.6)
*/
IMPLEMENT_CRMF_CTRL_FUNC(protocolEncrKey, X509_PUBKEY, regCtrl)
/*-
* Pushes the attribute given in regInfo in to the CertReqMsg->regInfo stack.
* (section 7)
* returns 1 on success, 0 on error
*/
static int OSSL_CRMF_MSG_push0_regInfo(OSSL_CRMF_MSG *crm,
OSSL_CRMF_ATTRIBUTETYPEANDVALUE *ri)
{
STACK_OF(OSSL_CRMF_ATTRIBUTETYPEANDVALUE) *info = NULL;
if (crm == NULL || ri == NULL) {
ERR_raise(ERR_LIB_CRMF, CRMF_R_NULL_ARGUMENT);
return 0;
}
if (crm->regInfo == NULL)
crm->regInfo = info = sk_OSSL_CRMF_ATTRIBUTETYPEANDVALUE_new_null();
if (crm->regInfo == NULL)
goto err;
if (!sk_OSSL_CRMF_ATTRIBUTETYPEANDVALUE_push(crm->regInfo, ri))
goto err;
return 1;
err:
if (info != NULL)
crm->regInfo = NULL;
sk_OSSL_CRMF_ATTRIBUTETYPEANDVALUE_free(info);
return 0;
}
/* id-regInfo-utf8Pairs to regInfo (section 7.1) */
IMPLEMENT_CRMF_CTRL_FUNC(utf8Pairs, ASN1_UTF8STRING, regInfo)
/* id-regInfo-certReq to regInfo (section 7.2) */
IMPLEMENT_CRMF_CTRL_FUNC(certReq, OSSL_CRMF_CERTREQUEST, regInfo)
/* retrieves the certificate template of crm */
OSSL_CRMF_CERTTEMPLATE *OSSL_CRMF_MSG_get0_tmpl(const OSSL_CRMF_MSG *crm)
{
if (crm == NULL || crm->certReq == NULL) {
ERR_raise(ERR_LIB_CRMF, CRMF_R_NULL_ARGUMENT);
return NULL;
}
return crm->certReq->certTemplate;
}
int OSSL_CRMF_MSG_set0_validity(OSSL_CRMF_MSG *crm,
ASN1_TIME *notBefore, ASN1_TIME *notAfter)
{
OSSL_CRMF_OPTIONALVALIDITY *vld;
OSSL_CRMF_CERTTEMPLATE *tmpl = OSSL_CRMF_MSG_get0_tmpl(crm);
if (tmpl == NULL) { /* also crm == NULL implies this */
ERR_raise(ERR_LIB_CRMF, CRMF_R_NULL_ARGUMENT);
return 0;
}
if ((vld = OSSL_CRMF_OPTIONALVALIDITY_new()) == NULL)
return 0;
vld->notBefore = notBefore;
vld->notAfter = notAfter;
tmpl->validity = vld;
return 1;
}
int OSSL_CRMF_MSG_set_certReqId(OSSL_CRMF_MSG *crm, int rid)
{
if (crm == NULL || crm->certReq == NULL || crm->certReq->certReqId == NULL) {
ERR_raise(ERR_LIB_CRMF, CRMF_R_NULL_ARGUMENT);
return 0;
}
return ASN1_INTEGER_set(crm->certReq->certReqId, rid);
}
/* get ASN.1 encoded integer, return -1 on error */
static int crmf_asn1_get_int(const ASN1_INTEGER *a)
{
int64_t res;
if (!ASN1_INTEGER_get_int64(&res, a)) {
ERR_raise(ERR_LIB_CRMF, ASN1_R_INVALID_NUMBER);
return -1;
}
if (res < INT_MIN) {
ERR_raise(ERR_LIB_CRMF, ASN1_R_TOO_SMALL);
return -1;
}
if (res > INT_MAX) {
ERR_raise(ERR_LIB_CRMF, ASN1_R_TOO_LARGE);
return -1;
}
return (int)res;
}
int OSSL_CRMF_MSG_get_certReqId(const OSSL_CRMF_MSG *crm)
{
if (crm == NULL || /* not really needed: */ crm->certReq == NULL) {
ERR_raise(ERR_LIB_CRMF, CRMF_R_NULL_ARGUMENT);
return -1;
}
return crmf_asn1_get_int(crm->certReq->certReqId);
}
int OSSL_CRMF_MSG_set0_extensions(OSSL_CRMF_MSG *crm,
X509_EXTENSIONS *exts)
{
OSSL_CRMF_CERTTEMPLATE *tmpl = OSSL_CRMF_MSG_get0_tmpl(crm);
if (tmpl == NULL) { /* also crm == NULL implies this */
ERR_raise(ERR_LIB_CRMF, CRMF_R_NULL_ARGUMENT);
return 0;
}
if (sk_X509_EXTENSION_num(exts) == 0) {
sk_X509_EXTENSION_free(exts);
exts = NULL; /* do not include empty extensions list */
}
sk_X509_EXTENSION_pop_free(tmpl->extensions, X509_EXTENSION_free);
tmpl->extensions = exts;
return 1;
}
int OSSL_CRMF_MSG_push0_extension(OSSL_CRMF_MSG *crm,
X509_EXTENSION *ext)
{
int new = 0;
OSSL_CRMF_CERTTEMPLATE *tmpl = OSSL_CRMF_MSG_get0_tmpl(crm);
if (tmpl == NULL || ext == NULL) { /* also crm == NULL implies this */
ERR_raise(ERR_LIB_CRMF, CRMF_R_NULL_ARGUMENT);
return 0;
}
if (tmpl->extensions == NULL) {
if ((tmpl->extensions = sk_X509_EXTENSION_new_null()) == NULL)
goto err;
new = 1;
}
if (!sk_X509_EXTENSION_push(tmpl->extensions, ext))
goto err;
return 1;
err:
if (new != 0) {
sk_X509_EXTENSION_free(tmpl->extensions);
tmpl->extensions = NULL;
}
return 0;
}
static int create_popo_signature(OSSL_CRMF_POPOSIGNINGKEY *ps,
const OSSL_CRMF_CERTREQUEST *cr,
EVP_PKEY *pkey, const EVP_MD *digest,
OSSL_LIB_CTX *libctx, const char *propq)
{
char name[80] = "";
EVP_PKEY *pub;
if (ps == NULL || cr == NULL || pkey == NULL) {
ERR_raise(ERR_LIB_CRMF, CRMF_R_NULL_ARGUMENT);
return 0;
}
pub = X509_PUBKEY_get0(cr->certTemplate->publicKey);
if (!ossl_x509_check_private_key(pub, pkey))
return 0;
if (ps->poposkInput != NULL) {
/* We do not support cases 1+2 defined in RFC 4211, section 4.1 */
ERR_raise(ERR_LIB_CRMF, CRMF_R_POPOSKINPUT_NOT_SUPPORTED);
return 0;
}
if (EVP_PKEY_get_default_digest_name(pkey, name, sizeof(name)) > 0
&& strcmp(name, "UNDEF") == 0) /* at least for Ed25519, Ed448 */
digest = NULL;
return ASN1_item_sign_ex(ASN1_ITEM_rptr(OSSL_CRMF_CERTREQUEST),
ps->algorithmIdentifier, NULL, ps->signature, cr,
NULL, pkey, digest, libctx, propq);
}
int OSSL_CRMF_MSG_create_popo(int meth, OSSL_CRMF_MSG *crm,
EVP_PKEY *pkey, const EVP_MD *digest,
OSSL_LIB_CTX *libctx, const char *propq)
{
OSSL_CRMF_POPO *pp = NULL;
ASN1_INTEGER *tag = NULL;
if (crm == NULL || (meth == OSSL_CRMF_POPO_SIGNATURE && pkey == NULL)) {
ERR_raise(ERR_LIB_CRMF, CRMF_R_NULL_ARGUMENT);
return 0;
}
if (meth == OSSL_CRMF_POPO_NONE)
goto end;
if ((pp = OSSL_CRMF_POPO_new()) == NULL)
goto err;
pp->type = meth;
switch (meth) {
case OSSL_CRMF_POPO_RAVERIFIED:
if ((pp->value.raVerified = ASN1_NULL_new()) == NULL)
goto err;
break;
case OSSL_CRMF_POPO_SIGNATURE:
{
OSSL_CRMF_POPOSIGNINGKEY *ps = OSSL_CRMF_POPOSIGNINGKEY_new();
if (ps == NULL)
goto err;
if (!create_popo_signature(ps, crm->certReq, pkey, digest,
libctx, propq)) {
OSSL_CRMF_POPOSIGNINGKEY_free(ps);
goto err;
}
pp->value.signature = ps;
}
break;
case OSSL_CRMF_POPO_KEYENC:
if ((pp->value.keyEncipherment = OSSL_CRMF_POPOPRIVKEY_new()) == NULL)
goto err;
tag = ASN1_INTEGER_new();
pp->value.keyEncipherment->type =
OSSL_CRMF_POPOPRIVKEY_SUBSEQUENTMESSAGE;
pp->value.keyEncipherment->value.subsequentMessage = tag;
if (tag == NULL
|| !ASN1_INTEGER_set(tag, OSSL_CRMF_SUBSEQUENTMESSAGE_ENCRCERT))
goto err;
break;
default:
ERR_raise(ERR_LIB_CRMF, CRMF_R_UNSUPPORTED_METHOD_FOR_CREATING_POPO);
goto err;
}
end:
OSSL_CRMF_POPO_free(crm->popo);
crm->popo = pp;
return 1;
err:
OSSL_CRMF_POPO_free(pp);
return 0;
}
/* verifies the Proof-of-Possession of the request with the given rid in reqs */
int OSSL_CRMF_MSGS_verify_popo(const OSSL_CRMF_MSGS *reqs,
int rid, int acceptRAVerified,
OSSL_LIB_CTX *libctx, const char *propq)
{
OSSL_CRMF_MSG *req = NULL;
X509_PUBKEY *pubkey = NULL;
OSSL_CRMF_POPOSIGNINGKEY *sig = NULL;
const ASN1_ITEM *it;
void *asn;
if (reqs == NULL || (req = sk_OSSL_CRMF_MSG_value(reqs, rid)) == NULL) {
ERR_raise(ERR_LIB_CRMF, CRMF_R_NULL_ARGUMENT);
return 0;
}
if (req->popo == NULL) {
ERR_raise(ERR_LIB_CRMF, CRMF_R_POPO_MISSING);
return 0;
}
switch (req->popo->type) {
case OSSL_CRMF_POPO_RAVERIFIED:
if (!acceptRAVerified) {
ERR_raise(ERR_LIB_CRMF, CRMF_R_POPO_RAVERIFIED_NOT_ACCEPTED);
return 0;
}
break;
case OSSL_CRMF_POPO_SIGNATURE:
pubkey = req->certReq->certTemplate->publicKey;
if (pubkey == NULL) {
ERR_raise(ERR_LIB_CRMF, CRMF_R_POPO_MISSING_PUBLIC_KEY);
return 0;
}
sig = req->popo->value.signature;
if (sig->poposkInput != NULL) {
/*
* According to RFC 4211: publicKey contains a copy of
* the public key from the certificate template. This MUST be
* exactly the same value as contained in the certificate template.
*/
if (sig->poposkInput->publicKey == NULL) {
ERR_raise(ERR_LIB_CRMF, CRMF_R_POPO_MISSING_PUBLIC_KEY);
return 0;
}
if (X509_PUBKEY_eq(pubkey, sig->poposkInput->publicKey) != 1) {
ERR_raise(ERR_LIB_CRMF, CRMF_R_POPO_INCONSISTENT_PUBLIC_KEY);
return 0;
}
/*
* Should check at this point the contents of the authInfo sub-field
* as requested in FR #19807 according to RFC 4211 section 4.1.
*/
it = ASN1_ITEM_rptr(OSSL_CRMF_POPOSIGNINGKEYINPUT);
asn = sig->poposkInput;
} else {
if (req->certReq->certTemplate->subject == NULL) {
ERR_raise(ERR_LIB_CRMF, CRMF_R_POPO_MISSING_SUBJECT);
return 0;
}
it = ASN1_ITEM_rptr(OSSL_CRMF_CERTREQUEST);
asn = req->certReq;
}
if (ASN1_item_verify_ex(it, sig->algorithmIdentifier, sig->signature,
asn, NULL, X509_PUBKEY_get0(pubkey), libctx,
propq) < 1)
return 0;
break;
case OSSL_CRMF_POPO_KEYENC:
/*
* When OSSL_CMP_certrep_new() supports encrypted certs,
* should return 1 if the type of req->popo->value.keyEncipherment
* is OSSL_CRMF_POPOPRIVKEY_SUBSEQUENTMESSAGE and
* its value.subsequentMessage == OSSL_CRMF_SUBSEQUENTMESSAGE_ENCRCERT
*/
case OSSL_CRMF_POPO_KEYAGREE:
default:
ERR_raise(ERR_LIB_CRMF, CRMF_R_UNSUPPORTED_POPO_METHOD);
return 0;
}
return 1;
}
X509_PUBKEY
*OSSL_CRMF_CERTTEMPLATE_get0_publicKey(const OSSL_CRMF_CERTTEMPLATE *tmpl)
{
return tmpl != NULL ? tmpl->publicKey : NULL;
}
const ASN1_INTEGER
*OSSL_CRMF_CERTTEMPLATE_get0_serialNumber(const OSSL_CRMF_CERTTEMPLATE *tmpl)
{
return tmpl != NULL ? tmpl->serialNumber : NULL;
}
const X509_NAME
*OSSL_CRMF_CERTTEMPLATE_get0_subject(const OSSL_CRMF_CERTTEMPLATE *tmpl)
{
return tmpl != NULL ? tmpl->subject : NULL;
}
const X509_NAME
*OSSL_CRMF_CERTTEMPLATE_get0_issuer(const OSSL_CRMF_CERTTEMPLATE *tmpl)
{
return tmpl != NULL ? tmpl->issuer : NULL;
}
X509_EXTENSIONS
*OSSL_CRMF_CERTTEMPLATE_get0_extensions(const OSSL_CRMF_CERTTEMPLATE *tmpl)
{
return tmpl != NULL ? tmpl->extensions : NULL;
}
const X509_NAME *OSSL_CRMF_CERTID_get0_issuer(const OSSL_CRMF_CERTID *cid)
{
return cid != NULL && cid->issuer->type == GEN_DIRNAME ?
cid->issuer->d.directoryName : NULL;
}
const ASN1_INTEGER *OSSL_CRMF_CERTID_get0_serialNumber(const OSSL_CRMF_CERTID
*cid)
{
return cid != NULL ? cid->serialNumber : NULL;
}
/*-
* Fill in the certificate template |tmpl|.
* Any other NULL argument will leave the respective field unchanged.
*/
int OSSL_CRMF_CERTTEMPLATE_fill(OSSL_CRMF_CERTTEMPLATE *tmpl,
EVP_PKEY *pubkey,
const X509_NAME *subject,
const X509_NAME *issuer,
const ASN1_INTEGER *serial)
{
if (tmpl == NULL) {
ERR_raise(ERR_LIB_CRMF, CRMF_R_NULL_ARGUMENT);
return 0;
}
if (subject != NULL && !X509_NAME_set((X509_NAME **)&tmpl->subject, subject))
return 0;
if (issuer != NULL && !X509_NAME_set((X509_NAME **)&tmpl->issuer, issuer))
return 0;
if (serial != NULL) {
ASN1_INTEGER_free(tmpl->serialNumber);
if ((tmpl->serialNumber = ASN1_INTEGER_dup(serial)) == NULL)
return 0;
}
if (pubkey != NULL && !X509_PUBKEY_set(&tmpl->publicKey, pubkey))
return 0;
return 1;
}
/*-
* Decrypts the certificate in the given encryptedValue using private key pkey.
* This is needed for the indirect PoP method as in RFC 4210 section 5.2.8.2.
*
* returns a pointer to the decrypted certificate
* returns NULL on error or if no certificate available
*/
X509
*OSSL_CRMF_ENCRYPTEDVALUE_get1_encCert(const OSSL_CRMF_ENCRYPTEDVALUE *ecert,
OSSL_LIB_CTX *libctx, const char *propq,
EVP_PKEY *pkey)
{
X509 *cert = NULL; /* decrypted certificate */
EVP_CIPHER_CTX *evp_ctx = NULL; /* context for symmetric encryption */
unsigned char *ek = NULL; /* decrypted symmetric encryption key */
size_t eksize = 0; /* size of decrypted symmetric encryption key */
EVP_CIPHER *cipher = NULL; /* used cipher */
int cikeysize = 0; /* key size from cipher */
unsigned char *iv = NULL; /* initial vector for symmetric encryption */
unsigned char *outbuf = NULL; /* decryption output buffer */
const unsigned char *p = NULL; /* needed for decoding ASN1 */
int n, outlen = 0;
EVP_PKEY_CTX *pkctx = NULL; /* private key context */
char name[OSSL_MAX_NAME_SIZE];
if (ecert == NULL || ecert->symmAlg == NULL || ecert->encSymmKey == NULL
|| ecert->encValue == NULL || pkey == NULL) {
ERR_raise(ERR_LIB_CRMF, CRMF_R_NULL_ARGUMENT);
return NULL;
}
/* select symmetric cipher based on algorithm given in message */
OBJ_obj2txt(name, sizeof(name), ecert->symmAlg->algorithm, 0);
(void)ERR_set_mark();
cipher = EVP_CIPHER_fetch(NULL, name, NULL);
if (cipher == NULL)
cipher = (EVP_CIPHER *)EVP_get_cipherbyname(name);
if (cipher == NULL) {
(void)ERR_clear_last_mark();
ERR_raise(ERR_LIB_CRMF, CRMF_R_UNSUPPORTED_CIPHER);
goto end;
}
(void)ERR_pop_to_mark();
cikeysize = EVP_CIPHER_get_key_length(cipher);
/* first the symmetric key needs to be decrypted */
pkctx = EVP_PKEY_CTX_new_from_pkey(libctx, pkey, propq);
if (pkctx == NULL || EVP_PKEY_decrypt_init(pkctx) <= 0
|| evp_pkey_decrypt_alloc(pkctx, &ek, &eksize, (size_t)cikeysize,
ecert->encSymmKey->data,
ecert->encSymmKey->length) <= 0)
goto end;
if ((iv = OPENSSL_malloc(EVP_CIPHER_get_iv_length(cipher))) == NULL)
goto end;
if (ASN1_TYPE_get_octetstring(ecert->symmAlg->parameter, iv,
EVP_CIPHER_get_iv_length(cipher))
!= EVP_CIPHER_get_iv_length(cipher)) {
ERR_raise(ERR_LIB_CRMF, CRMF_R_MALFORMED_IV);
goto end;
}
/*
* d2i_X509 changes the given pointer, so use p for decoding the message and
* keep the original pointer in outbuf so the memory can be freed later
*/
if ((p = outbuf = OPENSSL_malloc(ecert->encValue->length +
EVP_CIPHER_get_block_size(cipher))) == NULL
|| (evp_ctx = EVP_CIPHER_CTX_new()) == NULL)
goto end;
EVP_CIPHER_CTX_set_padding(evp_ctx, 0);
if (!EVP_DecryptInit(evp_ctx, cipher, ek, iv)
|| !EVP_DecryptUpdate(evp_ctx, outbuf, &outlen,
ecert->encValue->data,
ecert->encValue->length)
|| !EVP_DecryptFinal(evp_ctx, outbuf + outlen, &n)) {
ERR_raise(ERR_LIB_CRMF, CRMF_R_ERROR_DECRYPTING_CERTIFICATE);
goto end;
}
outlen += n;
/* convert decrypted certificate from DER to internal ASN.1 structure */
if ((cert = X509_new_ex(libctx, propq)) == NULL)
goto end;
if (d2i_X509(&cert, &p, outlen) == NULL)
ERR_raise(ERR_LIB_CRMF, CRMF_R_ERROR_DECODING_CERTIFICATE);
end:
EVP_PKEY_CTX_free(pkctx);
OPENSSL_free(outbuf);
EVP_CIPHER_CTX_free(evp_ctx);
EVP_CIPHER_free(cipher);
OPENSSL_clear_free(ek, eksize);
OPENSSL_free(iv);
return cert;
}
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