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      1 /*
      2  * Copyright 2020-2022 The OpenSSL Project Authors. All Rights Reserved.
      3  *
      4  * Licensed under the Apache License 2.0 (the "License").  You may not use
      5  * this file except in compliance with the License.  You can obtain a copy
      6  * in the file LICENSE in the source distribution or at
      7  * https://www.openssl.org/source/license.html
      8  */
      9 
     10 #include <openssl/core.h>
     11 #include <openssl/buffer.h>
     12 #include "internal/asn1.h"
     13 #include "prov/bio.h"
     14 #include "endecoder_local.h"
     15 
     16 OSSL_FUNC_keymgmt_new_fn *
     17 ossl_prov_get_keymgmt_new(const OSSL_DISPATCH *fns)
     18 {
     19     /* Pilfer the keymgmt dispatch table */
     20     for (; fns->function_id != 0; fns++)
     21         if (fns->function_id == OSSL_FUNC_KEYMGMT_NEW)
     22             return OSSL_FUNC_keymgmt_new(fns);
     23 
     24     return NULL;
     25 }
     26 
     27 OSSL_FUNC_keymgmt_free_fn *
     28 ossl_prov_get_keymgmt_free(const OSSL_DISPATCH *fns)
     29 {
     30     /* Pilfer the keymgmt dispatch table */
     31     for (; fns->function_id != 0; fns++)
     32         if (fns->function_id == OSSL_FUNC_KEYMGMT_FREE)
     33             return OSSL_FUNC_keymgmt_free(fns);
     34 
     35     return NULL;
     36 }
     37 
     38 OSSL_FUNC_keymgmt_import_fn *
     39 ossl_prov_get_keymgmt_import(const OSSL_DISPATCH *fns)
     40 {
     41     /* Pilfer the keymgmt dispatch table */
     42     for (; fns->function_id != 0; fns++)
     43         if (fns->function_id == OSSL_FUNC_KEYMGMT_IMPORT)
     44             return OSSL_FUNC_keymgmt_import(fns);
     45 
     46     return NULL;
     47 }
     48 
     49 OSSL_FUNC_keymgmt_export_fn *
     50 ossl_prov_get_keymgmt_export(const OSSL_DISPATCH *fns)
     51 {
     52     /* Pilfer the keymgmt dispatch table */
     53     for (; fns->function_id != 0; fns++)
     54         if (fns->function_id == OSSL_FUNC_KEYMGMT_EXPORT)
     55             return OSSL_FUNC_keymgmt_export(fns);
     56 
     57     return NULL;
     58 }
     59 
     60 void *ossl_prov_import_key(const OSSL_DISPATCH *fns, void *provctx,
     61                            int selection, const OSSL_PARAM params[])
     62 {
     63     OSSL_FUNC_keymgmt_new_fn *kmgmt_new = ossl_prov_get_keymgmt_new(fns);
     64     OSSL_FUNC_keymgmt_free_fn *kmgmt_free = ossl_prov_get_keymgmt_free(fns);
     65     OSSL_FUNC_keymgmt_import_fn *kmgmt_import =
     66         ossl_prov_get_keymgmt_import(fns);
     67     void *key = NULL;
     68 
     69     if (kmgmt_new != NULL && kmgmt_import != NULL && kmgmt_free != NULL) {
     70         if ((key = kmgmt_new(provctx)) == NULL
     71             || !kmgmt_import(key, selection, params)) {
     72             kmgmt_free(key);
     73             key = NULL;
     74         }
     75     }
     76     return key;
     77 }
     78 
     79 void ossl_prov_free_key(const OSSL_DISPATCH *fns, void *key)
     80 {
     81     OSSL_FUNC_keymgmt_free_fn *kmgmt_free = ossl_prov_get_keymgmt_free(fns);
     82 
     83     if (kmgmt_free != NULL)
     84         kmgmt_free(key);
     85 }
     86 
     87 int ossl_read_der(PROV_CTX *provctx, OSSL_CORE_BIO *cin,  unsigned char **data,
     88                   long *len)
     89 {
     90     BUF_MEM *mem = NULL;
     91     BIO *in = ossl_bio_new_from_core_bio(provctx, cin);
     92     int ok;
     93 
     94     if (in == NULL)
     95         return 0;
     96     ok = (asn1_d2i_read_bio(in, &mem) >= 0);
     97     if (ok) {
     98         *data = (unsigned char *)mem->data;
     99         *len = (long)mem->length;
    100         OPENSSL_free(mem);
    101     }
    102     BIO_free(in);
    103     return ok;
    104 }
    105