[331] | 1 | /*
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| 2 | * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #include <stdio.h>
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| 11 | #include "internal/cryptlib.h"
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| 12 | #include <openssl/bn.h>
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| 13 | #include <openssl/evp.h>
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| 14 | #include <openssl/objects.h>
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| 15 | #include <openssl/engine.h>
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| 16 | #include <openssl/x509.h>
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| 17 | #include <openssl/asn1.h>
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| 18 | #include "internal/asn1_int.h"
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| 19 | #include "internal/evp_int.h"
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| 20 |
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| 21 | EVP_PKEY *d2i_PrivateKey(int type, EVP_PKEY **a, const unsigned char **pp,
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| 22 | long length)
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| 23 | {
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| 24 | EVP_PKEY *ret;
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| 25 | const unsigned char *p = *pp;
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| 26 |
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| 27 | if ((a == NULL) || (*a == NULL)) {
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| 28 | if ((ret = EVP_PKEY_new()) == NULL) {
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| 29 | ASN1err(ASN1_F_D2I_PRIVATEKEY, ERR_R_EVP_LIB);
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| 30 | return (NULL);
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| 31 | }
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| 32 | } else {
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| 33 | ret = *a;
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| 34 | #ifndef OPENSSL_NO_ENGINE
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| 35 | ENGINE_finish(ret->engine);
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| 36 | ret->engine = NULL;
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| 37 | #endif
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| 38 | }
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| 39 |
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| 40 | if (!EVP_PKEY_set_type(ret, type)) {
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| 41 | ASN1err(ASN1_F_D2I_PRIVATEKEY, ASN1_R_UNKNOWN_PUBLIC_KEY_TYPE);
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| 42 | goto err;
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| 43 | }
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| 44 |
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| 45 | if (!ret->ameth->old_priv_decode ||
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| 46 | !ret->ameth->old_priv_decode(ret, &p, length)) {
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| 47 | if (ret->ameth->priv_decode) {
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| 48 | EVP_PKEY *tmp;
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| 49 | PKCS8_PRIV_KEY_INFO *p8 = NULL;
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| 50 | p8 = d2i_PKCS8_PRIV_KEY_INFO(NULL, &p, length);
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| 51 | if (!p8)
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| 52 | goto err;
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| 53 | tmp = EVP_PKCS82PKEY(p8);
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| 54 | PKCS8_PRIV_KEY_INFO_free(p8);
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| 55 | if (tmp == NULL)
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| 56 | goto err;
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| 57 | EVP_PKEY_free(ret);
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| 58 | ret = tmp;
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| 59 | } else {
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| 60 | ASN1err(ASN1_F_D2I_PRIVATEKEY, ERR_R_ASN1_LIB);
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| 61 | goto err;
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| 62 | }
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| 63 | }
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| 64 | *pp = p;
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| 65 | if (a != NULL)
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| 66 | (*a) = ret;
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| 67 | return (ret);
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| 68 | err:
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| 69 | if (a == NULL || *a != ret)
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| 70 | EVP_PKEY_free(ret);
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| 71 | return (NULL);
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| 72 | }
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| 73 |
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| 74 | /*
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| 75 | * This works like d2i_PrivateKey() except it automatically works out the
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| 76 | * type
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| 77 | */
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| 78 |
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| 79 | EVP_PKEY *d2i_AutoPrivateKey(EVP_PKEY **a, const unsigned char **pp,
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| 80 | long length)
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| 81 | {
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| 82 | STACK_OF(ASN1_TYPE) *inkey;
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| 83 | const unsigned char *p;
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| 84 | int keytype;
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| 85 | p = *pp;
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| 86 | /*
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| 87 | * Dirty trick: read in the ASN1 data into a STACK_OF(ASN1_TYPE): by
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| 88 | * analyzing it we can determine the passed structure: this assumes the
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| 89 | * input is surrounded by an ASN1 SEQUENCE.
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| 90 | */
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| 91 | inkey = d2i_ASN1_SEQUENCE_ANY(NULL, &p, length);
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| 92 | p = *pp;
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| 93 | /*
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| 94 | * Since we only need to discern "traditional format" RSA and DSA keys we
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| 95 | * can just count the elements.
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| 96 | */
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| 97 | if (sk_ASN1_TYPE_num(inkey) == 6)
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| 98 | keytype = EVP_PKEY_DSA;
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| 99 | else if (sk_ASN1_TYPE_num(inkey) == 4)
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| 100 | keytype = EVP_PKEY_EC;
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| 101 | else if (sk_ASN1_TYPE_num(inkey) == 3) { /* This seems to be PKCS8, not
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| 102 | * traditional format */
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| 103 | PKCS8_PRIV_KEY_INFO *p8 = d2i_PKCS8_PRIV_KEY_INFO(NULL, &p, length);
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| 104 | EVP_PKEY *ret;
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| 105 |
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| 106 | sk_ASN1_TYPE_pop_free(inkey, ASN1_TYPE_free);
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| 107 | if (!p8) {
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| 108 | ASN1err(ASN1_F_D2I_AUTOPRIVATEKEY,
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| 109 | ASN1_R_UNSUPPORTED_PUBLIC_KEY_TYPE);
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| 110 | return NULL;
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| 111 | }
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| 112 | ret = EVP_PKCS82PKEY(p8);
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| 113 | PKCS8_PRIV_KEY_INFO_free(p8);
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| 114 | if (ret == NULL)
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| 115 | return NULL;
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| 116 | *pp = p;
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| 117 | if (a) {
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| 118 | *a = ret;
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| 119 | }
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| 120 | return ret;
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| 121 | } else
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| 122 | keytype = EVP_PKEY_RSA;
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| 123 | sk_ASN1_TYPE_pop_free(inkey, ASN1_TYPE_free);
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| 124 | return d2i_PrivateKey(keytype, a, pp, length);
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| 125 | }
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