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fecb3aae22
Reviewed-by: Tomas Mraz <tomas@openssl.org> Release: yes
256 lines
7.3 KiB
C
256 lines
7.3 KiB
C
/*
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* Copyright 2006-2022 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (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 <assert.h>
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#include <openssl/cms.h>
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#include <openssl/err.h>
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#include "crypto/asn1.h"
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#include "crypto/rsa.h"
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#include "cms_local.h"
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static RSA_OAEP_PARAMS *rsa_oaep_decode(const X509_ALGOR *alg)
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{
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RSA_OAEP_PARAMS *oaep;
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oaep = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(RSA_OAEP_PARAMS),
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alg->parameter);
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if (oaep == NULL)
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return NULL;
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if (oaep->maskGenFunc != NULL) {
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oaep->maskHash = ossl_x509_algor_mgf1_decode(oaep->maskGenFunc);
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if (oaep->maskHash == NULL) {
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RSA_OAEP_PARAMS_free(oaep);
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return NULL;
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}
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}
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return oaep;
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}
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static int rsa_cms_decrypt(CMS_RecipientInfo *ri)
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{
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EVP_PKEY_CTX *pkctx;
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X509_ALGOR *cmsalg;
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int nid;
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int rv = -1;
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unsigned char *label = NULL;
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int labellen = 0;
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const EVP_MD *mgf1md = NULL, *md = NULL;
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RSA_OAEP_PARAMS *oaep;
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pkctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
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if (pkctx == NULL)
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return 0;
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if (!CMS_RecipientInfo_ktri_get0_algs(ri, NULL, NULL, &cmsalg))
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return -1;
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nid = OBJ_obj2nid(cmsalg->algorithm);
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if (nid == NID_rsaEncryption)
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return 1;
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if (nid != NID_rsaesOaep) {
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ERR_raise(ERR_LIB_CMS, CMS_R_UNSUPPORTED_ENCRYPTION_TYPE);
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return -1;
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}
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/* Decode OAEP parameters */
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oaep = rsa_oaep_decode(cmsalg);
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if (oaep == NULL) {
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ERR_raise(ERR_LIB_CMS, CMS_R_INVALID_OAEP_PARAMETERS);
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goto err;
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}
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mgf1md = ossl_x509_algor_get_md(oaep->maskHash);
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if (mgf1md == NULL)
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goto err;
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md = ossl_x509_algor_get_md(oaep->hashFunc);
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if (md == NULL)
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goto err;
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if (oaep->pSourceFunc != NULL) {
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X509_ALGOR *plab = oaep->pSourceFunc;
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if (OBJ_obj2nid(plab->algorithm) != NID_pSpecified) {
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ERR_raise(ERR_LIB_CMS, CMS_R_UNSUPPORTED_LABEL_SOURCE);
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goto err;
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}
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if (plab->parameter->type != V_ASN1_OCTET_STRING) {
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ERR_raise(ERR_LIB_CMS, CMS_R_INVALID_LABEL);
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goto err;
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}
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label = plab->parameter->value.octet_string->data;
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/* Stop label being freed when OAEP parameters are freed */
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plab->parameter->value.octet_string->data = NULL;
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labellen = plab->parameter->value.octet_string->length;
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}
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if (EVP_PKEY_CTX_set_rsa_padding(pkctx, RSA_PKCS1_OAEP_PADDING) <= 0)
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goto err;
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if (EVP_PKEY_CTX_set_rsa_oaep_md(pkctx, md) <= 0)
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goto err;
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if (EVP_PKEY_CTX_set_rsa_mgf1_md(pkctx, mgf1md) <= 0)
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goto err;
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if (label != NULL
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&& EVP_PKEY_CTX_set0_rsa_oaep_label(pkctx, label, labellen) <= 0)
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goto err;
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/* Carry on */
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rv = 1;
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err:
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RSA_OAEP_PARAMS_free(oaep);
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return rv;
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}
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static int rsa_cms_encrypt(CMS_RecipientInfo *ri)
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{
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const EVP_MD *md, *mgf1md;
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RSA_OAEP_PARAMS *oaep = NULL;
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ASN1_STRING *os = NULL;
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X509_ALGOR *alg;
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EVP_PKEY_CTX *pkctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
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int pad_mode = RSA_PKCS1_PADDING, rv = 0, labellen;
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unsigned char *label;
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if (CMS_RecipientInfo_ktri_get0_algs(ri, NULL, NULL, &alg) <= 0)
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return 0;
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if (pkctx != NULL) {
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if (EVP_PKEY_CTX_get_rsa_padding(pkctx, &pad_mode) <= 0)
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return 0;
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}
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if (pad_mode == RSA_PKCS1_PADDING)
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return X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaEncryption),
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V_ASN1_NULL, NULL);
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/* Not supported */
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if (pad_mode != RSA_PKCS1_OAEP_PADDING)
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return 0;
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if (EVP_PKEY_CTX_get_rsa_oaep_md(pkctx, &md) <= 0)
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goto err;
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if (EVP_PKEY_CTX_get_rsa_mgf1_md(pkctx, &mgf1md) <= 0)
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goto err;
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labellen = EVP_PKEY_CTX_get0_rsa_oaep_label(pkctx, &label);
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if (labellen < 0)
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goto err;
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oaep = RSA_OAEP_PARAMS_new();
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if (oaep == NULL)
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goto err;
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if (!ossl_x509_algor_new_from_md(&oaep->hashFunc, md))
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goto err;
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if (!ossl_x509_algor_md_to_mgf1(&oaep->maskGenFunc, mgf1md))
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goto err;
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if (labellen > 0) {
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ASN1_OCTET_STRING *los = ASN1_OCTET_STRING_new();
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if (los == NULL)
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goto err;
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if (!ASN1_OCTET_STRING_set(los, label, labellen)) {
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ASN1_OCTET_STRING_free(los);
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goto err;
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}
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oaep->pSourceFunc = ossl_X509_ALGOR_from_nid(NID_pSpecified,
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V_ASN1_OCTET_STRING, los);
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if (oaep->pSourceFunc == NULL)
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goto err;
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}
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/* create string with pss parameter encoding. */
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if (!ASN1_item_pack(oaep, ASN1_ITEM_rptr(RSA_OAEP_PARAMS), &os))
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goto err;
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if (!X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaesOaep), V_ASN1_SEQUENCE, os))
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goto err;
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os = NULL;
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rv = 1;
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err:
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RSA_OAEP_PARAMS_free(oaep);
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ASN1_STRING_free(os);
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return rv;
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}
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int ossl_cms_rsa_envelope(CMS_RecipientInfo *ri, int decrypt)
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{
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assert(decrypt == 0 || decrypt == 1);
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if (decrypt == 1)
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return rsa_cms_decrypt(ri);
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if (decrypt == 0)
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return rsa_cms_encrypt(ri);
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ERR_raise(ERR_LIB_CMS, CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
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return 0;
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}
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static int rsa_cms_sign(CMS_SignerInfo *si)
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{
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int pad_mode = RSA_PKCS1_PADDING;
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X509_ALGOR *alg;
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EVP_PKEY_CTX *pkctx = CMS_SignerInfo_get0_pkey_ctx(si);
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ASN1_STRING *os = NULL;
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CMS_SignerInfo_get0_algs(si, NULL, NULL, NULL, &alg);
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if (pkctx != NULL) {
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if (EVP_PKEY_CTX_get_rsa_padding(pkctx, &pad_mode) <= 0)
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return 0;
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}
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if (pad_mode == RSA_PKCS1_PADDING)
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return X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaEncryption),
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V_ASN1_NULL, NULL);
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/* We don't support it */
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if (pad_mode != RSA_PKCS1_PSS_PADDING)
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return 0;
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os = ossl_rsa_ctx_to_pss_string(pkctx);
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if (os == NULL)
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return 0;
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if (X509_ALGOR_set0(alg, OBJ_nid2obj(EVP_PKEY_RSA_PSS),
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V_ASN1_SEQUENCE, os))
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return 1;
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ASN1_STRING_free(os);
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return 0;
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}
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static int rsa_cms_verify(CMS_SignerInfo *si)
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{
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int nid, nid2;
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X509_ALGOR *alg;
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EVP_PKEY_CTX *pkctx = CMS_SignerInfo_get0_pkey_ctx(si);
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EVP_PKEY *pkey = EVP_PKEY_CTX_get0_pkey(pkctx);
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CMS_SignerInfo_get0_algs(si, NULL, NULL, NULL, &alg);
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nid = OBJ_obj2nid(alg->algorithm);
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if (nid == EVP_PKEY_RSA_PSS)
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return ossl_rsa_pss_to_ctx(NULL, pkctx, alg, NULL) > 0;
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/* Only PSS allowed for PSS keys */
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if (EVP_PKEY_is_a(pkey, "RSA-PSS")) {
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ERR_raise(ERR_LIB_RSA, RSA_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE);
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return 0;
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}
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if (nid == NID_rsaEncryption)
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return 1;
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/* Workaround for some implementation that use a signature OID */
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if (OBJ_find_sigid_algs(nid, NULL, &nid2)) {
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if (nid2 == NID_rsaEncryption)
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return 1;
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}
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return 0;
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}
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int ossl_cms_rsa_sign(CMS_SignerInfo *si, int verify)
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{
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assert(verify == 0 || verify == 1);
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if (verify == 1)
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return rsa_cms_verify(si);
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if (verify == 0)
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return rsa_cms_sign(si);
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ERR_raise(ERR_LIB_CMS, CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
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return 0;
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}
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