crypto/asn1/d2i_pr.c

   1 /*
   2  * Copyright 1995-2016 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 "internal/cryptlib.h"
  12 #include <openssl/bn.h>
  13 #include <openssl/evp.h>
  14 #include <openssl/objects.h>
  15 #include <openssl/engine.h>
  16 #include <openssl/x509.h>
  17 #include <openssl/asn1.h>
  18 #include "crypto/asn1.h"
  19 #include "crypto/evp.h"
  20
  21 EVP_PKEY *d2i_PrivateKey_ex(int type, EVP_PKEY **a, const unsigned char **pp,
  22                             long length, OPENSSL_CTX *libctx, const char *propq)
  23 {
  24     EVP_PKEY *ret;
  25     const unsigned char *p = *pp;
  26
  27     if ((a == NULL) || (*a == NULL)) {
  28         if ((ret = EVP_PKEY_new()) == NULL) {
  29             ASN1err(0, ERR_R_EVP_LIB);
  30             return NULL;
  31         }
  32     } else {
  33         ret = *a;
  34 #ifndef OPENSSL_NO_ENGINE
  35         ENGINE_finish(ret->engine);
  36         ret->engine = NULL;
  37 #endif
  38     }
  39
  40     if (!EVP_PKEY_set_type(ret, type)) {
  41         ASN1err(0, ASN1_R_UNKNOWN_PUBLIC_KEY_TYPE);
  42         goto err;
  43     }
  44
  45     if (!ret->ameth->old_priv_decode ||
  46         !ret->ameth->old_priv_decode(ret, &p, length)) {
  47         if (ret->ameth->priv_decode != NULL
  48                 || ret->ameth->priv_decode_with_libctx != NULL) {
  49             EVP_PKEY *tmp;
  50             PKCS8_PRIV_KEY_INFO *p8 = NULL;
  51             p8 = d2i_PKCS8_PRIV_KEY_INFO(NULL, &p, length);
  52             if (p8 == NULL)
  53                 goto err;
  54             tmp = evp_pkcs82pkey_int(p8, libctx, propq);
  55             PKCS8_PRIV_KEY_INFO_free(p8);
  56             if (tmp == NULL)
  57                 goto err;
  58             EVP_PKEY_free(ret);
  59             ret = tmp;
  60         } else {
  61             ASN1err(0, ERR_R_ASN1_LIB);
  62             goto err;
  63         }
  64     }
  65     *pp = p;
  66     if (a != NULL)
  67         (*a) = ret;
  68     return ret;
  69  err:
  70     if (a == NULL || *a != ret)
  71         EVP_PKEY_free(ret);
  72     return NULL;
  73 }
  74
  75 EVP_PKEY *d2i_PrivateKey(int type, EVP_PKEY **a, const unsigned char **pp,
  76                          long length)
  77 {
  78     return d2i_PrivateKey_ex(type, a, pp, length, NULL, NULL);
  79 }
  80
  81 /*
  82  * This works like d2i_PrivateKey() except it automatically works out the
  83  * type
  84  */
  85
  86 EVP_PKEY *d2i_AutoPrivateKey_ex(EVP_PKEY **a, const unsigned char **pp,
  87                                 long length, OPENSSL_CTX *libctx,
  88                                 const char *propq)
  89 {
  90     STACK_OF(ASN1_TYPE) *inkey;
  91     const unsigned char *p;
  92     int keytype;
  93     p = *pp;
  94     /*
  95      * Dirty trick: read in the ASN1 data into a STACK_OF(ASN1_TYPE): by
  96      * analyzing it we can determine the passed structure: this assumes the
  97      * input is surrounded by an ASN1 SEQUENCE.
  98      */
  99     inkey = d2i_ASN1_SEQUENCE_ANY(NULL, &p, length);
 100     p = *pp;
 101     /*
 102      * Since we only need to discern "traditional format" RSA and DSA keys we
 103      * can just count the elements.
 104      */
 105     if (sk_ASN1_TYPE_num(inkey) == 6) {
 106         keytype = EVP_PKEY_DSA;
 107     } else if (sk_ASN1_TYPE_num(inkey) == 4) {
 108         keytype = EVP_PKEY_EC;
 109     } else if (sk_ASN1_TYPE_num(inkey) == 3) { /* This seems to be PKCS8, not
 110                                               * traditional format */
 111         PKCS8_PRIV_KEY_INFO *p8 = d2i_PKCS8_PRIV_KEY_INFO(NULL, &p, length);
 112         EVP_PKEY *ret;
 113
 114         sk_ASN1_TYPE_pop_free(inkey, ASN1_TYPE_free);
 115         if (p8 == NULL) {
 116             ASN1err(0, ASN1_R_UNSUPPORTED_PUBLIC_KEY_TYPE);
 117             return NULL;
 118         }
 119         ret = evp_pkcs82pkey_int(p8, libctx, propq);
 120         PKCS8_PRIV_KEY_INFO_free(p8);
 121         if (ret == NULL)
 122             return NULL;
 123         *pp = p;
 124         if (a) {
 125             *a = ret;
 126         }
 127         return ret;
 128     } else {
 129         keytype = EVP_PKEY_RSA;
 130     }
 131     sk_ASN1_TYPE_pop_free(inkey, ASN1_TYPE_free);
 132     return d2i_PrivateKey_ex(keytype, a, pp, length, libctx, propq);
 133 }
 134
 135 EVP_PKEY *d2i_AutoPrivateKey(EVP_PKEY **a, const unsigned char **pp,
 136                              long length)
 137 {
 138     return d2i_AutoPrivateKey_ex(a, pp, length, NULL, NULL);
 139 }