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/*
* Copyright 2006-2022 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <assert.h>
#include <openssl/cms.h>
#include <openssl/err.h>
#include "crypto/asn1.h"
#include "crypto/rsa.h"
#include "cms_local.h"
static RSA_OAEP_PARAMS *rsa_oaep_decode(const X509_ALGOR *alg)
{
RSA_OAEP_PARAMS *oaep;
oaep = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(RSA_OAEP_PARAMS),
alg->parameter);
if (oaep == NULL)
return NULL;
if (oaep->maskGenFunc != NULL) {
oaep->maskHash = ossl_x509_algor_mgf1_decode(oaep->maskGenFunc);
if (oaep->maskHash == NULL) {
RSA_OAEP_PARAMS_free(oaep);
return NULL;
}
}
return oaep;
}
static int rsa_cms_decrypt(CMS_RecipientInfo *ri)
{
EVP_PKEY_CTX *pkctx;
X509_ALGOR *cmsalg;
int nid;
int rv = -1;
unsigned char *label = NULL;
int labellen = 0;
const EVP_MD *mgf1md = NULL, *md = NULL;
RSA_OAEP_PARAMS *oaep;
pkctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
if (pkctx == NULL)
return 0;
if (!CMS_RecipientInfo_ktri_get0_algs(ri, NULL, NULL, &cmsalg))
return -1;
nid = OBJ_obj2nid(cmsalg->algorithm);
if (nid == NID_rsaEncryption)
return 1;
if (nid != NID_rsaesOaep) {
ERR_raise(ERR_LIB_CMS, CMS_R_UNSUPPORTED_ENCRYPTION_TYPE);
return -1;
}
/* Decode OAEP parameters */
oaep = rsa_oaep_decode(cmsalg);
if (oaep == NULL) {
ERR_raise(ERR_LIB_CMS, CMS_R_INVALID_OAEP_PARAMETERS);
goto err;
}
mgf1md = ossl_x509_algor_get_md(oaep->maskHash);
if (mgf1md == NULL)
goto err;
md = ossl_x509_algor_get_md(oaep->hashFunc);
if (md == NULL)
goto err;
if (oaep->pSourceFunc != NULL) {
X509_ALGOR *plab = oaep->pSourceFunc;
if (OBJ_obj2nid(plab->algorithm) != NID_pSpecified) {
ERR_raise(ERR_LIB_CMS, CMS_R_UNSUPPORTED_LABEL_SOURCE);
goto err;
}
if (plab->parameter->type != V_ASN1_OCTET_STRING) {
ERR_raise(ERR_LIB_CMS, CMS_R_INVALID_LABEL);
goto err;
}
label = plab->parameter->value.octet_string->data;
/* Stop label being freed when OAEP parameters are freed */
plab->parameter->value.octet_string->data = NULL;
labellen = plab->parameter->value.octet_string->length;
}
if (EVP_PKEY_CTX_set_rsa_padding(pkctx, RSA_PKCS1_OAEP_PADDING) <= 0)
goto err;
if (EVP_PKEY_CTX_set_rsa_oaep_md(pkctx, md) <= 0)
goto err;
if (EVP_PKEY_CTX_set_rsa_mgf1_md(pkctx, mgf1md) <= 0)
goto err;
if (label != NULL
&& EVP_PKEY_CTX_set0_rsa_oaep_label(pkctx, label, labellen) <= 0)
goto err;
/* Carry on */
rv = 1;
err:
RSA_OAEP_PARAMS_free(oaep);
return rv;
}
static int rsa_cms_encrypt(CMS_RecipientInfo *ri)
{
const EVP_MD *md, *mgf1md;
RSA_OAEP_PARAMS *oaep = NULL;
ASN1_STRING *os = NULL;
X509_ALGOR *alg;
EVP_PKEY_CTX *pkctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
int pad_mode = RSA_PKCS1_PADDING, rv = 0, labellen;
unsigned char *label;
if (CMS_RecipientInfo_ktri_get0_algs(ri, NULL, NULL, &alg) <= 0)
return 0;
if (pkctx != NULL) {
if (EVP_PKEY_CTX_get_rsa_padding(pkctx, &pad_mode) <= 0)
return 0;
}
if (pad_mode == RSA_PKCS1_PADDING)
return X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaEncryption),
V_ASN1_NULL, NULL);
/* Not supported */
if (pad_mode != RSA_PKCS1_OAEP_PADDING)
return 0;
if (EVP_PKEY_CTX_get_rsa_oaep_md(pkctx, &md) <= 0)
goto err;
if (EVP_PKEY_CTX_get_rsa_mgf1_md(pkctx, &mgf1md) <= 0)
goto err;
labellen = EVP_PKEY_CTX_get0_rsa_oaep_label(pkctx, &label);
if (labellen < 0)
goto err;
oaep = RSA_OAEP_PARAMS_new();
if (oaep == NULL)
goto err;
if (!ossl_x509_algor_new_from_md(&oaep->hashFunc, md))
goto err;
if (!ossl_x509_algor_md_to_mgf1(&oaep->maskGenFunc, mgf1md))
goto err;
if (labellen > 0) {
ASN1_OCTET_STRING *los = ASN1_OCTET_STRING_new();
if (los == NULL)
goto err;
if (!ASN1_OCTET_STRING_set(los, label, labellen)) {
ASN1_OCTET_STRING_free(los);
goto err;
}
oaep->pSourceFunc = ossl_X509_ALGOR_from_nid(NID_pSpecified,
V_ASN1_OCTET_STRING, los);
if (oaep->pSourceFunc == NULL)
goto err;
}
/* create string with pss parameter encoding. */
if (!ASN1_item_pack(oaep, ASN1_ITEM_rptr(RSA_OAEP_PARAMS), &os))
goto err;
if (!X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaesOaep), V_ASN1_SEQUENCE, os))
goto err;
os = NULL;
rv = 1;
err:
RSA_OAEP_PARAMS_free(oaep);
ASN1_STRING_free(os);
return rv;
}
int ossl_cms_rsa_envelope(CMS_RecipientInfo *ri, int decrypt)
{
assert(decrypt == 0 || decrypt == 1);
if (decrypt == 1)
return rsa_cms_decrypt(ri);
if (decrypt == 0)
return rsa_cms_encrypt(ri);
ERR_raise(ERR_LIB_CMS, CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
return 0;
}
static int rsa_cms_sign(CMS_SignerInfo *si)
{
int pad_mode = RSA_PKCS1_PADDING;
X509_ALGOR *alg;
EVP_PKEY_CTX *pkctx = CMS_SignerInfo_get0_pkey_ctx(si);
ASN1_STRING *os = NULL;
CMS_SignerInfo_get0_algs(si, NULL, NULL, NULL, &alg);
if (pkctx != NULL) {
if (EVP_PKEY_CTX_get_rsa_padding(pkctx, &pad_mode) <= 0)
return 0;
}
if (pad_mode == RSA_PKCS1_PADDING)
return X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaEncryption),
V_ASN1_NULL, NULL);
/* We don't support it */
if (pad_mode != RSA_PKCS1_PSS_PADDING)
return 0;
os = ossl_rsa_ctx_to_pss_string(pkctx);
if (os == NULL)
return 0;
if (X509_ALGOR_set0(alg, OBJ_nid2obj(EVP_PKEY_RSA_PSS),
V_ASN1_SEQUENCE, os))
return 1;
ASN1_STRING_free(os);
return 0;
}
static int rsa_cms_verify(CMS_SignerInfo *si)
{
int nid, nid2;
X509_ALGOR *alg;
EVP_PKEY_CTX *pkctx = CMS_SignerInfo_get0_pkey_ctx(si);
EVP_PKEY *pkey = EVP_PKEY_CTX_get0_pkey(pkctx);
CMS_SignerInfo_get0_algs(si, NULL, NULL, NULL, &alg);
nid = OBJ_obj2nid(alg->algorithm);
if (nid == EVP_PKEY_RSA_PSS)
return ossl_rsa_pss_to_ctx(NULL, pkctx, alg, NULL) > 0;
/* Only PSS allowed for PSS keys */
if (EVP_PKEY_is_a(pkey, "RSA-PSS")) {
ERR_raise(ERR_LIB_RSA, RSA_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE);
return 0;
}
if (nid == NID_rsaEncryption)
return 1;
/* Workaround for some implementation that use a signature OID */
if (OBJ_find_sigid_algs(nid, NULL, &nid2)) {
if (nid2 == NID_rsaEncryption)
return 1;
}
return 0;
}
int ossl_cms_rsa_sign(CMS_SignerInfo *si, int verify)
{
assert(verify == 0 || verify == 1);
if (verify == 1)
return rsa_cms_verify(si);
if (verify == 0)
return rsa_cms_sign(si);
ERR_raise(ERR_LIB_CMS, CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
return 0;
}
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