mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
synced 2024-12-11 14:28:08 +01:00
418 lines
12 KiB
C
418 lines
12 KiB
C
/*
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* Copyright 2006-2023 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 <limits.h>
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#include <openssl/cms.h>
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#include <openssl/err.h>
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#include <openssl/decoder.h>
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#include "internal/sizes.h"
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#include "crypto/evp.h"
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#include "cms_local.h"
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static EVP_PKEY *pkey_type2param(int ptype, const void *pval,
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OSSL_LIB_CTX *libctx, const char *propq)
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{
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EVP_PKEY *pkey = NULL;
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EVP_PKEY_CTX *pctx = NULL;
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OSSL_DECODER_CTX *ctx = 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 = pstr->data;
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size_t pmlen = (size_t)pstr->length;
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int selection = OSSL_KEYMGMT_SELECT_ALL_PARAMETERS;
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ctx = OSSL_DECODER_CTX_new_for_pkey(&pkey, "DER", NULL, "EC",
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selection, libctx, propq);
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if (ctx == NULL)
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goto err;
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if (!OSSL_DECODER_from_data(ctx, &pm, &pmlen)) {
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ERR_raise(ERR_LIB_CMS, CMS_R_DECODE_ERROR);
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goto err;
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}
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OSSL_DECODER_CTX_free(ctx);
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return pkey;
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} else if (ptype == V_ASN1_OBJECT) {
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const ASN1_OBJECT *poid = pval;
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char groupname[OSSL_MAX_NAME_SIZE];
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/* type == V_ASN1_OBJECT => the parameters are given by an asn1 OID */
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pctx = EVP_PKEY_CTX_new_from_name(libctx, "EC", propq);
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if (pctx == NULL || EVP_PKEY_paramgen_init(pctx) <= 0)
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goto err;
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if (OBJ_obj2txt(groupname, sizeof(groupname), poid, 0) <= 0
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|| EVP_PKEY_CTX_set_group_name(pctx, groupname) <= 0) {
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ERR_raise(ERR_LIB_CMS, CMS_R_DECODE_ERROR);
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goto err;
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}
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if (EVP_PKEY_paramgen(pctx, &pkey) <= 0)
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goto err;
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EVP_PKEY_CTX_free(pctx);
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return pkey;
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}
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ERR_raise(ERR_LIB_CMS, CMS_R_DECODE_ERROR);
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return NULL;
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err:
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EVP_PKEY_free(pkey);
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EVP_PKEY_CTX_free(pctx);
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OSSL_DECODER_CTX_free(ctx);
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return NULL;
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}
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static int ecdh_cms_set_peerkey(EVP_PKEY_CTX *pctx,
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X509_ALGOR *alg, ASN1_BIT_STRING *pubkey)
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{
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const ASN1_OBJECT *aoid;
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int atype;
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const void *aval;
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int rv = 0;
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EVP_PKEY *pkpeer = NULL;
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const unsigned char *p;
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int plen;
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X509_ALGOR_get0(&aoid, &atype, &aval, alg);
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if (OBJ_obj2nid(aoid) != NID_X9_62_id_ecPublicKey)
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goto err;
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/* If absent parameters get group from main key */
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if (atype == V_ASN1_UNDEF || atype == V_ASN1_NULL) {
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EVP_PKEY *pk;
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pk = EVP_PKEY_CTX_get0_pkey(pctx);
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if (pk == NULL)
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goto err;
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pkpeer = EVP_PKEY_new();
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if (pkpeer == NULL)
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goto err;
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if (!EVP_PKEY_copy_parameters(pkpeer, pk))
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goto err;
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} else {
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pkpeer = pkey_type2param(atype, aval,
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EVP_PKEY_CTX_get0_libctx(pctx),
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EVP_PKEY_CTX_get0_propq(pctx));
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if (pkpeer == NULL)
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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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plen = ASN1_STRING_length(pubkey);
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p = ASN1_STRING_get0_data(pubkey);
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if (p == NULL || plen == 0)
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goto err;
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if (!EVP_PKEY_set1_encoded_public_key(pkpeer, p, plen))
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goto err;
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if (EVP_PKEY_derive_set_peer(pctx, pkpeer) > 0)
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rv = 1;
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err:
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EVP_PKEY_free(pkpeer);
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return rv;
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}
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/* Set KDF parameters based on KDF NID */
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static int ecdh_cms_set_kdf_param(EVP_PKEY_CTX *pctx, int eckdf_nid)
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{
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int kdf_nid, kdfmd_nid, cofactor;
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const EVP_MD *kdf_md;
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if (eckdf_nid == NID_undef)
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return 0;
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/* Lookup KDF type, cofactor mode and digest */
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if (!OBJ_find_sigid_algs(eckdf_nid, &kdfmd_nid, &kdf_nid))
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return 0;
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if (kdf_nid == NID_dh_std_kdf)
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cofactor = 0;
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else if (kdf_nid == NID_dh_cofactor_kdf)
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cofactor = 1;
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else
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return 0;
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if (EVP_PKEY_CTX_set_ecdh_cofactor_mode(pctx, cofactor) <= 0)
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return 0;
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if (EVP_PKEY_CTX_set_ecdh_kdf_type(pctx, EVP_PKEY_ECDH_KDF_X9_63) <= 0)
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return 0;
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kdf_md = EVP_get_digestbynid(kdfmd_nid);
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if (!kdf_md)
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return 0;
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if (EVP_PKEY_CTX_set_ecdh_kdf_md(pctx, kdf_md) <= 0)
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return 0;
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return 1;
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}
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static int ecdh_cms_set_shared_info(EVP_PKEY_CTX *pctx, CMS_RecipientInfo *ri)
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{
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int rv = 0;
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X509_ALGOR *alg, *kekalg = NULL;
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ASN1_OCTET_STRING *ukm;
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const unsigned char *p;
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unsigned char *der = NULL;
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int plen, keylen;
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EVP_CIPHER *kekcipher = NULL;
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EVP_CIPHER_CTX *kekctx;
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char name[OSSL_MAX_NAME_SIZE];
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if (!CMS_RecipientInfo_kari_get0_alg(ri, &alg, &ukm))
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return 0;
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if (!ecdh_cms_set_kdf_param(pctx, OBJ_obj2nid(alg->algorithm))) {
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ERR_raise(ERR_LIB_CMS, CMS_R_KDF_PARAMETER_ERROR);
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return 0;
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}
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if (alg->parameter->type != V_ASN1_SEQUENCE)
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return 0;
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p = alg->parameter->value.sequence->data;
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plen = alg->parameter->value.sequence->length;
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kekalg = d2i_X509_ALGOR(NULL, &p, plen);
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if (kekalg == NULL)
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goto err;
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kekctx = CMS_RecipientInfo_kari_get0_ctx(ri);
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if (kekctx == NULL)
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goto err;
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OBJ_obj2txt(name, sizeof(name), kekalg->algorithm, 0);
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kekcipher = EVP_CIPHER_fetch(pctx->libctx, name, pctx->propquery);
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if (kekcipher == NULL || EVP_CIPHER_get_mode(kekcipher) != EVP_CIPH_WRAP_MODE)
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goto err;
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if (!EVP_EncryptInit_ex(kekctx, kekcipher, NULL, NULL, NULL))
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goto err;
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if (EVP_CIPHER_asn1_to_param(kekctx, kekalg->parameter) <= 0)
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goto err;
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keylen = EVP_CIPHER_CTX_get_key_length(kekctx);
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if (EVP_PKEY_CTX_set_ecdh_kdf_outlen(pctx, keylen) <= 0)
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goto err;
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plen = CMS_SharedInfo_encode(&der, kekalg, ukm, keylen);
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if (plen <= 0)
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goto err;
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if (EVP_PKEY_CTX_set0_ecdh_kdf_ukm(pctx, der, plen) <= 0)
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goto err;
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der = NULL;
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rv = 1;
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err:
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EVP_CIPHER_free(kekcipher);
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X509_ALGOR_free(kekalg);
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OPENSSL_free(der);
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return rv;
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}
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static int ecdh_cms_decrypt(CMS_RecipientInfo *ri)
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{
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EVP_PKEY_CTX *pctx;
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pctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
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if (pctx == NULL)
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return 0;
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/* See if we need to set peer key */
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if (!EVP_PKEY_CTX_get0_peerkey(pctx)) {
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X509_ALGOR *alg;
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ASN1_BIT_STRING *pubkey;
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if (!CMS_RecipientInfo_kari_get0_orig_id(ri, &alg, &pubkey,
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NULL, NULL, NULL))
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return 0;
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if (alg == NULL || pubkey == NULL)
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return 0;
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if (!ecdh_cms_set_peerkey(pctx, alg, pubkey)) {
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ERR_raise(ERR_LIB_CMS, CMS_R_PEER_KEY_ERROR);
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return 0;
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}
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}
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/* Set ECDH derivation parameters and initialise unwrap context */
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if (!ecdh_cms_set_shared_info(pctx, ri)) {
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ERR_raise(ERR_LIB_CMS, CMS_R_SHARED_INFO_ERROR);
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return 0;
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}
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return 1;
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}
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static int ecdh_cms_encrypt(CMS_RecipientInfo *ri)
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{
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EVP_PKEY_CTX *pctx;
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EVP_PKEY *pkey;
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EVP_CIPHER_CTX *ctx;
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int keylen;
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X509_ALGOR *talg, *wrap_alg = NULL;
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const ASN1_OBJECT *aoid;
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ASN1_BIT_STRING *pubkey;
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ASN1_STRING *wrap_str;
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ASN1_OCTET_STRING *ukm;
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unsigned char *penc = NULL;
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int penclen;
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int rv = 0;
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int ecdh_nid, kdf_type, kdf_nid, wrap_nid;
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const EVP_MD *kdf_md;
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pctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
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if (pctx == NULL)
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return 0;
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/* Get ephemeral key */
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pkey = EVP_PKEY_CTX_get0_pkey(pctx);
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if (!CMS_RecipientInfo_kari_get0_orig_id(ri, &talg, &pubkey,
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NULL, NULL, NULL))
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goto err;
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X509_ALGOR_get0(&aoid, NULL, NULL, talg);
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/* Is everything uninitialised? */
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if (aoid == OBJ_nid2obj(NID_undef)) {
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/* Set the key */
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size_t enckeylen;
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enckeylen = EVP_PKEY_get1_encoded_public_key(pkey, &penc);
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if (enckeylen > INT_MAX || enckeylen == 0)
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goto err;
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ASN1_STRING_set0(pubkey, penc, (int)enckeylen);
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pubkey->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
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pubkey->flags |= ASN1_STRING_FLAG_BITS_LEFT;
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penc = NULL;
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(void)X509_ALGOR_set0(talg, OBJ_nid2obj(NID_X9_62_id_ecPublicKey),
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V_ASN1_UNDEF, NULL); /* cannot fail */
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}
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/* See if custom parameters set */
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kdf_type = EVP_PKEY_CTX_get_ecdh_kdf_type(pctx);
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if (kdf_type <= 0)
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goto err;
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if (EVP_PKEY_CTX_get_ecdh_kdf_md(pctx, &kdf_md) <= 0)
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goto err;
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ecdh_nid = EVP_PKEY_CTX_get_ecdh_cofactor_mode(pctx);
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if (ecdh_nid < 0)
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goto err;
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else if (ecdh_nid == 0)
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ecdh_nid = NID_dh_std_kdf;
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else if (ecdh_nid == 1)
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ecdh_nid = NID_dh_cofactor_kdf;
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if (kdf_type == EVP_PKEY_ECDH_KDF_NONE) {
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kdf_type = EVP_PKEY_ECDH_KDF_X9_63;
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if (EVP_PKEY_CTX_set_ecdh_kdf_type(pctx, kdf_type) <= 0)
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goto err;
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} else
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/* Unknown KDF */
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goto err;
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if (kdf_md == NULL) {
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/* Fixme later for better MD */
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kdf_md = EVP_sha1();
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if (EVP_PKEY_CTX_set_ecdh_kdf_md(pctx, kdf_md) <= 0)
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goto err;
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}
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if (!CMS_RecipientInfo_kari_get0_alg(ri, &talg, &ukm))
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goto err;
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/* Lookup NID for KDF+cofactor+digest */
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if (!OBJ_find_sigid_by_algs(&kdf_nid, EVP_MD_get_type(kdf_md), ecdh_nid))
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goto err;
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/* Get wrap NID */
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ctx = CMS_RecipientInfo_kari_get0_ctx(ri);
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wrap_nid = EVP_CIPHER_CTX_get_type(ctx);
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keylen = EVP_CIPHER_CTX_get_key_length(ctx);
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/* Package wrap algorithm in an AlgorithmIdentifier */
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wrap_alg = X509_ALGOR_new();
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if (wrap_alg == NULL)
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goto err;
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wrap_alg->algorithm = OBJ_nid2obj(wrap_nid);
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wrap_alg->parameter = ASN1_TYPE_new();
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if (wrap_alg->parameter == NULL)
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goto err;
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if (EVP_CIPHER_param_to_asn1(ctx, wrap_alg->parameter) <= 0)
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goto err;
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if (ASN1_TYPE_get(wrap_alg->parameter) == NID_undef) {
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ASN1_TYPE_free(wrap_alg->parameter);
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wrap_alg->parameter = NULL;
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}
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if (EVP_PKEY_CTX_set_ecdh_kdf_outlen(pctx, keylen) <= 0)
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goto err;
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penclen = CMS_SharedInfo_encode(&penc, wrap_alg, ukm, keylen);
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if (penclen <= 0)
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goto err;
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if (EVP_PKEY_CTX_set0_ecdh_kdf_ukm(pctx, penc, penclen) <= 0)
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goto err;
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penc = NULL;
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/*
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* Now need to wrap encoding of wrap AlgorithmIdentifier into parameter
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* of another AlgorithmIdentifier.
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*/
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penclen = i2d_X509_ALGOR(wrap_alg, &penc);
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if (penclen <= 0)
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goto err;
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wrap_str = ASN1_STRING_new();
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if (wrap_str == NULL)
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goto err;
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ASN1_STRING_set0(wrap_str, penc, penclen);
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penc = NULL;
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X509_ALGOR_set0(talg, OBJ_nid2obj(kdf_nid), V_ASN1_SEQUENCE, wrap_str);
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rv = 1;
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err:
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OPENSSL_free(penc);
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X509_ALGOR_free(wrap_alg);
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return rv;
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}
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int ossl_cms_ecdh_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 ecdh_cms_decrypt(ri);
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if (decrypt == 0)
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return ecdh_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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/* ECDSA and DSA implementation is the same */
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int ossl_cms_ecdsa_dsa_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 == 0) {
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int snid, hnid;
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X509_ALGOR *alg1, *alg2;
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EVP_PKEY *pkey = si->pkey;
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CMS_SignerInfo_get0_algs(si, 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;
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if (!OBJ_find_sigid_by_algs(&snid, hnid, EVP_PKEY_get_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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}
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