crypto/evp/evp_pkey.c

   1 /*
   2  * Copyright 1999-2021 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 <stdio.h>
  11 #include <stdlib.h>
  12 #include "internal/cryptlib.h"
  13 #include <openssl/x509.h>
  14 #include <openssl/rand.h>
  15 #include <openssl/encoder.h>
  16 #include "internal/provider.h"
  17 #include "crypto/asn1.h"
  18 #include "crypto/evp.h"
  19 #include "crypto/x509.h"
  20
  21 /* Extract a private key from a PKCS8 structure */
  22
  23 EVP_PKEY *EVP_PKCS82PKEY_ex(const PKCS8_PRIV_KEY_INFO *p8, OSSL_LIB_CTX *libctx,
  24                             const char *propq)
  25 {
  26     EVP_PKEY *pkey = NULL;
  27     const ASN1_OBJECT *algoid;
  28     char obj_tmp[80];
  29
  30     if (!PKCS8_pkey_get0(&algoid, NULL, NULL, NULL, p8))
  31         return NULL;
  32
  33     if ((pkey = EVP_PKEY_new()) == NULL) {
  34         ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
  35         return NULL;
  36     }
  37
  38     if (!EVP_PKEY_set_type(pkey, OBJ_obj2nid(algoid))) {
  39         i2t_ASN1_OBJECT(obj_tmp, 80, algoid);
  40         ERR_raise_data(ERR_LIB_EVP, EVP_R_UNSUPPORTED_PRIVATE_KEY_ALGORITHM,
  41                        "TYPE=%s", obj_tmp);
  42         goto error;
  43     }
  44
  45     if (pkey->ameth->priv_decode_ex != NULL) {
  46         if (!pkey->ameth->priv_decode_ex(pkey, p8, libctx, propq))
  47             goto error;
  48     } else if (pkey->ameth->priv_decode != NULL) {
  49         if (!pkey->ameth->priv_decode(pkey, p8)) {
  50             ERR_raise(ERR_LIB_EVP, EVP_R_PRIVATE_KEY_DECODE_ERROR);
  51             goto error;
  52         }
  53     } else {
  54         ERR_raise(ERR_LIB_EVP, EVP_R_METHOD_NOT_SUPPORTED);
  55         goto error;
  56     }
  57
  58     return pkey;
  59
  60  error:
  61     EVP_PKEY_free(pkey);
  62     return NULL;
  63 }
  64
  65 EVP_PKEY *EVP_PKCS82PKEY(const PKCS8_PRIV_KEY_INFO *p8)
  66 {
  67     return EVP_PKCS82PKEY_ex(p8, NULL, NULL);
  68 }
  69
  70 /* Turn a private key into a PKCS8 structure */
  71
  72 PKCS8_PRIV_KEY_INFO *EVP_PKEY2PKCS8(const EVP_PKEY *pkey)
  73 {
  74     PKCS8_PRIV_KEY_INFO *p8 = NULL;
  75     OSSL_ENCODER_CTX *ctx = NULL;
  76
  77     /*
  78      * The implementation for provider-native keys is to encode the
  79      * key to a DER encoded PKCS#8 structure, then convert it to a
  80      * PKCS8_PRIV_KEY_INFO with good old d2i functions.
  81      */
  82     if (evp_pkey_is_provided(pkey)) {
  83         int selection = OSSL_KEYMGMT_SELECT_ALL;
  84         unsigned char *der = NULL;
  85         size_t derlen = 0;
  86         const unsigned char *pp;
  87
  88         if ((ctx = OSSL_ENCODER_CTX_new_for_pkey(pkey, selection,
  89                                                  "DER", "pkcs8",
  90                                                  NULL)) == NULL
  91             || !OSSL_ENCODER_to_data(ctx, &der, &derlen))
  92             goto error;
  93
  94         pp = der;
  95         p8 = d2i_PKCS8_PRIV_KEY_INFO(NULL, &pp, (long)derlen);
  96         OPENSSL_free(der);
  97         if (p8 == NULL)
  98             goto error;
  99     } else {
 100         p8 = PKCS8_PRIV_KEY_INFO_new();
 101         if (p8  == NULL) {
 102             ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
 103             return NULL;
 104         }
 105
 106         if (pkey->ameth != NULL) {
 107             if (pkey->ameth->priv_encode != NULL) {
 108                 if (!pkey->ameth->priv_encode(p8, pkey)) {
 109                     ERR_raise(ERR_LIB_EVP, EVP_R_PRIVATE_KEY_ENCODE_ERROR);
 110                     goto error;
 111                 }
 112             } else {
 113                 ERR_raise(ERR_LIB_EVP, EVP_R_METHOD_NOT_SUPPORTED);
 114                 goto error;
 115             }
 116         } else {
 117             ERR_raise(ERR_LIB_EVP, EVP_R_UNSUPPORTED_PRIVATE_KEY_ALGORITHM);
 118             goto error;
 119         }
 120     }
 121     goto end;
 122  error:
 123     PKCS8_PRIV_KEY_INFO_free(p8);
 124     p8 = NULL;
 125  end:
 126     OSSL_ENCODER_CTX_free(ctx);
 127     return p8;
 128
 129 }
 130
 131 /* EVP_PKEY attribute functions */
 132
 133 int EVP_PKEY_get_attr_count(const EVP_PKEY *key)
 134 {
 135     return X509at_get_attr_count(key->attributes);
 136 }
 137
 138 int EVP_PKEY_get_attr_by_NID(const EVP_PKEY *key, int nid, int lastpos)
 139 {
 140     return X509at_get_attr_by_NID(key->attributes, nid, lastpos);
 141 }
 142
 143 int EVP_PKEY_get_attr_by_OBJ(const EVP_PKEY *key, const ASN1_OBJECT *obj,
 144                              int lastpos)
 145 {
 146     return X509at_get_attr_by_OBJ(key->attributes, obj, lastpos);
 147 }
 148
 149 X509_ATTRIBUTE *EVP_PKEY_get_attr(const EVP_PKEY *key, int loc)
 150 {
 151     return X509at_get_attr(key->attributes, loc);
 152 }
 153
 154 X509_ATTRIBUTE *EVP_PKEY_delete_attr(EVP_PKEY *key, int loc)
 155 {
 156     return X509at_delete_attr(key->attributes, loc);
 157 }
 158
 159 int EVP_PKEY_add1_attr(EVP_PKEY *key, X509_ATTRIBUTE *attr)
 160 {
 161     if (X509at_add1_attr(&key->attributes, attr))
 162         return 1;
 163     return 0;
 164 }
 165
 166 int EVP_PKEY_add1_attr_by_OBJ(EVP_PKEY *key,
 167                               const ASN1_OBJECT *obj, int type,
 168                               const unsigned char *bytes, int len)
 169 {
 170     if (X509at_add1_attr_by_OBJ(&key->attributes, obj, type, bytes, len))
 171         return 1;
 172     return 0;
 173 }
 174
 175 int EVP_PKEY_add1_attr_by_NID(EVP_PKEY *key,
 176                               int nid, int type,
 177                               const unsigned char *bytes, int len)
 178 {
 179     if (X509at_add1_attr_by_NID(&key->attributes, nid, type, bytes, len))
 180         return 1;
 181     return 0;
 182 }
 183
 184 int EVP_PKEY_add1_attr_by_txt(EVP_PKEY *key,
 185                               const char *attrname, int type,
 186                               const unsigned char *bytes, int len)
 187 {
 188     if (X509at_add1_attr_by_txt(&key->attributes, attrname, type, bytes, len))
 189         return 1;
 190     return 0;
 191 }
 192
 193 const char *EVP_PKEY_get0_first_alg_name(const EVP_PKEY *key)
 194 {
 195     const EVP_PKEY_ASN1_METHOD *ameth;
 196     const char *name = NULL;
 197
 198     if (key->keymgmt != NULL)
 199         return EVP_KEYMGMT_get0_first_name(key->keymgmt);
 200
 201     /* Otherwise fallback to legacy */
 202     ameth = EVP_PKEY_get0_asn1(key);
 203     if (ameth != NULL)
 204         EVP_PKEY_asn1_get0_info(NULL, NULL,
 205                                 NULL, NULL, &name, ameth);
 206
 207     return name;
 208 }