crypto/asn1/i2d_evp.c

   1 /*
   2  * Copyright 1995-2021 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 /*
  11  * Low level APIs are deprecated for public use, but still ok for
  12  * internal use.
  13  */
  14 #include "internal/deprecated.h"
  15
  16 #include <stdio.h>
  17 #include "internal/cryptlib.h"
  18 #include <openssl/evp.h>
  19 #include <openssl/encoder.h>
  20 #include <openssl/buffer.h>
  21 #include <openssl/x509.h>
  22 #include <openssl/rsa.h>         /* For i2d_RSAPublicKey */
  23 #include <openssl/dsa.h>         /* For i2d_DSAPublicKey */
  24 #include <openssl/ec.h>          /* For i2o_ECPublicKey */
  25 #include "crypto/asn1.h"
  26 #include "crypto/evp.h"
  27
  28 static int i2d_provided(const EVP_PKEY *a, int selection,
  29                         const char *output_structures[],
  30                         unsigned char **pp)
  31 {
  32     OSSL_ENCODER_CTX *ctx = NULL;
  33     int ret;
  34
  35     for (ret = -1;
  36          ret == -1 && *output_structures != NULL;
  37          output_structures++) {
  38         /*
  39          * The i2d_ calls don't take a boundary length for *pp.  However,
  40          * OSSL_ENCODER_CTX_get_num_encoders() needs one, so we make one
  41          * up.
  42          */
  43         size_t len = INT_MAX;
  44
  45         ctx = OSSL_ENCODER_CTX_new_for_pkey(a, selection, "DER",
  46                                             *output_structures, NULL);
  47         if (ctx == NULL)
  48             return -1;
  49         if (OSSL_ENCODER_to_data(ctx, pp, &len))
  50             ret = (int)len;
  51         OSSL_ENCODER_CTX_free(ctx);
  52         ctx = NULL;
  53     }
  54
  55     if (ret == -1)
  56         ERR_raise(ERR_LIB_ASN1, ASN1_R_UNSUPPORTED_TYPE);
  57     return ret;
  58 }
  59
  60 int i2d_KeyParams(const EVP_PKEY *a, unsigned char **pp)
  61 {
  62     if (evp_pkey_is_provided(a)) {
  63         const char *output_structures[] = { "type-specific", NULL };
  64
  65         return i2d_provided(a, EVP_PKEY_KEY_PARAMETERS, output_structures, pp);
  66     }
  67     if (a->ameth != NULL && a->ameth->param_encode != NULL)
  68         return a->ameth->param_encode(a, pp);
  69     ERR_raise(ERR_LIB_ASN1, ASN1_R_UNSUPPORTED_TYPE);
  70     return -1;
  71 }
  72
  73 int i2d_KeyParams_bio(BIO *bp, const EVP_PKEY *pkey)
  74 {
  75     return ASN1_i2d_bio_of(EVP_PKEY, i2d_KeyParams, bp, pkey);
  76 }
  77
  78 int i2d_PrivateKey(const EVP_PKEY *a, unsigned char **pp)
  79 {
  80     if (evp_pkey_is_provided(a)) {
  81         const char *output_structures[] = { "type-specific", "pkcs8", NULL };
  82
  83         return i2d_provided(a, EVP_PKEY_KEYPAIR, output_structures, pp);
  84     }
  85     if (a->ameth != NULL && a->ameth->old_priv_encode != NULL) {
  86         return a->ameth->old_priv_encode(a, pp);
  87     }
  88     if (a->ameth != NULL && a->ameth->priv_encode != NULL) {
  89         PKCS8_PRIV_KEY_INFO *p8 = EVP_PKEY2PKCS8(a);
  90         int ret = 0;
  91
  92         if (p8 != NULL) {
  93             ret = i2d_PKCS8_PRIV_KEY_INFO(p8, pp);
  94             PKCS8_PRIV_KEY_INFO_free(p8);
  95         }
  96         return ret;
  97     }
  98     ERR_raise(ERR_LIB_ASN1, ASN1_R_UNSUPPORTED_PUBLIC_KEY_TYPE);
  99     return -1;
 100 }
 101
 102 int i2d_PublicKey(const EVP_PKEY *a, unsigned char **pp)
 103 {
 104     if (evp_pkey_is_provided(a)) {
 105         const char *output_structures[] = { "type-specific", NULL };
 106
 107         return i2d_provided(a, EVP_PKEY_PUBLIC_KEY, output_structures, pp);
 108     }
 109     switch (EVP_PKEY_id(a)) {
 110     case EVP_PKEY_RSA:
 111         return i2d_RSAPublicKey(EVP_PKEY_get0_RSA(a), pp);
 112 #ifndef OPENSSL_NO_DSA
 113     case EVP_PKEY_DSA:
 114         return i2d_DSAPublicKey(EVP_PKEY_get0_DSA(a), pp);
 115 #endif
 116 #ifndef OPENSSL_NO_EC
 117     case EVP_PKEY_EC:
 118         return i2o_ECPublicKey(EVP_PKEY_get0_EC_KEY(a), pp);
 119 #endif
 120     default:
 121         ERR_raise(ERR_LIB_ASN1, ASN1_R_UNSUPPORTED_PUBLIC_KEY_TYPE);
 122         return -1;
 123     }
 124 }