crypto/evp/evp_pkey.c

   1 /*
   2  * Copyright 1999-2020 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 "crypto/asn1.h"
  16 #include "crypto/evp.h"
  17 #include "crypto/x509.h"
  18
  19 /* Extract a private key from a PKCS8 structure */
  20
  21 EVP_PKEY *EVP_PKCS82PKEY_with_libctx(const PKCS8_PRIV_KEY_INFO *p8,
  22                                      OPENSSL_CTX *libctx, const char *propq)
  23 {
  24     EVP_PKEY *pkey = NULL;
  25     const ASN1_OBJECT *algoid;
  26     char obj_tmp[80];
  27
  28     if (!PKCS8_pkey_get0(&algoid, NULL, NULL, NULL, p8))
  29         return NULL;
  30
  31     if ((pkey = EVP_PKEY_new()) == NULL) {
  32         EVPerr(0, ERR_R_MALLOC_FAILURE);
  33         return NULL;
  34     }
  35
  36     if (!EVP_PKEY_set_type(pkey, OBJ_obj2nid(algoid))) {
  37         EVPerr(0, EVP_R_UNSUPPORTED_PRIVATE_KEY_ALGORITHM);
  38         i2t_ASN1_OBJECT(obj_tmp, 80, algoid);
  39         ERR_add_error_data(2, "TYPE=", obj_tmp);
  40         goto error;
  41     }
  42
  43     if (pkey->ameth->priv_decode_with_libctx != NULL) {
  44         if (!pkey->ameth->priv_decode_with_libctx(pkey, p8, libctx, propq)) {
  45             EVPerr(0, EVP_R_PRIVATE_KEY_DECODE_ERROR);
  46             goto error;
  47         }
  48     } else if (pkey->ameth->priv_decode != NULL) {
  49         if (!pkey->ameth->priv_decode(pkey, p8)) {
  50             EVPerr(0, EVP_R_PRIVATE_KEY_DECODE_ERROR);
  51             goto error;
  52         }
  53     } else {
  54         EVPerr(0, 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_with_libctx(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 = PKCS8_PRIV_KEY_INFO_new();
  75     if (p8  == NULL) {
  76         EVPerr(EVP_F_EVP_PKEY2PKCS8, ERR_R_MALLOC_FAILURE);
  77         return NULL;
  78     }
  79
  80     /* Force a key downgrade if that's possible */
  81     /* TODO(3.0) Is there a better way for provider-native keys? */
  82     if (EVP_PKEY_get0(pkey) == NULL)
  83         return NULL;
  84
  85     if (pkey->ameth) {
  86         if (pkey->ameth->priv_encode) {
  87             if (!pkey->ameth->priv_encode(p8, pkey)) {
  88                 EVPerr(EVP_F_EVP_PKEY2PKCS8, EVP_R_PRIVATE_KEY_ENCODE_ERROR);
  89                 goto error;
  90             }
  91         } else {
  92             EVPerr(EVP_F_EVP_PKEY2PKCS8, EVP_R_METHOD_NOT_SUPPORTED);
  93             goto error;
  94         }
  95     } else {
  96         EVPerr(EVP_F_EVP_PKEY2PKCS8, EVP_R_UNSUPPORTED_PRIVATE_KEY_ALGORITHM);
  97         goto error;
  98     }
  99     return p8;
 100  error:
 101     PKCS8_PRIV_KEY_INFO_free(p8);
 102     return NULL;
 103 }
 104
 105 /* EVP_PKEY attribute functions */
 106
 107 int EVP_PKEY_get_attr_count(const EVP_PKEY *key)
 108 {
 109     return X509at_get_attr_count(key->attributes);
 110 }
 111
 112 int EVP_PKEY_get_attr_by_NID(const EVP_PKEY *key, int nid, int lastpos)
 113 {
 114     return X509at_get_attr_by_NID(key->attributes, nid, lastpos);
 115 }
 116
 117 int EVP_PKEY_get_attr_by_OBJ(const EVP_PKEY *key, const ASN1_OBJECT *obj,
 118                              int lastpos)
 119 {
 120     return X509at_get_attr_by_OBJ(key->attributes, obj, lastpos);
 121 }
 122
 123 X509_ATTRIBUTE *EVP_PKEY_get_attr(const EVP_PKEY *key, int loc)
 124 {
 125     return X509at_get_attr(key->attributes, loc);
 126 }
 127
 128 X509_ATTRIBUTE *EVP_PKEY_delete_attr(EVP_PKEY *key, int loc)
 129 {
 130     return X509at_delete_attr(key->attributes, loc);
 131 }
 132
 133 int EVP_PKEY_add1_attr(EVP_PKEY *key, X509_ATTRIBUTE *attr)
 134 {
 135     if (X509at_add1_attr(&key->attributes, attr))
 136         return 1;
 137     return 0;
 138 }
 139
 140 int EVP_PKEY_add1_attr_by_OBJ(EVP_PKEY *key,
 141                               const ASN1_OBJECT *obj, int type,
 142                               const unsigned char *bytes, int len)
 143 {
 144     if (X509at_add1_attr_by_OBJ(&key->attributes, obj, type, bytes, len))
 145         return 1;
 146     return 0;
 147 }
 148
 149 int EVP_PKEY_add1_attr_by_NID(EVP_PKEY *key,
 150                               int nid, int type,
 151                               const unsigned char *bytes, int len)
 152 {
 153     if (X509at_add1_attr_by_NID(&key->attributes, nid, type, bytes, len))
 154         return 1;
 155     return 0;
 156 }
 157
 158 int EVP_PKEY_add1_attr_by_txt(EVP_PKEY *key,
 159                               const char *attrname, int type,
 160                               const unsigned char *bytes, int len)
 161 {
 162     if (X509at_add1_attr_by_txt(&key->attributes, attrname, type, bytes, len))
 163         return 1;
 164     return 0;
 165 }
 166
 167 const char *EVP_PKEY_get0_first_alg_name(const EVP_PKEY *key)
 168 {
 169     const EVP_PKEY_ASN1_METHOD *ameth;
 170     const char *name = NULL;
 171
 172     if (key->keymgmt != NULL)
 173         return EVP_KEYMGMT_get0_first_name(key->keymgmt);
 174
 175     /* Otherwise fallback to legacy */
 176     ameth = EVP_PKEY_get0_asn1(key);
 177     if (ameth != NULL)
 178         EVP_PKEY_asn1_get0_info(NULL, NULL,
 179                                 NULL, NULL, &name, ameth);
 180
 181     return name;
 182 }