| 1 | /*
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| 2 | * Copyright 2007-2021 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/evp.h>
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| 13 | #include "crypto/asn1.h"
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| 14 | #include "crypto/evp.h"
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| 15 |
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| 16 | /*
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| 17 | * HMAC "ASN1" method. This is just here to indicate the maximum HMAC output
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| 18 | * length and to free up an HMAC key.
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| 19 | */
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| 20 |
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| 21 | static int hmac_size(const EVP_PKEY *pkey)
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| 22 | {
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| 23 | return EVP_MAX_MD_SIZE;
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| 24 | }
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| 25 |
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| 26 | static void hmac_key_free(EVP_PKEY *pkey)
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| 27 | {
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| 28 | ASN1_OCTET_STRING *os = EVP_PKEY_get0(pkey);
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| 29 | if (os) {
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| 30 | if (os->data)
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| 31 | OPENSSL_cleanse(os->data, os->length);
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| 32 | ASN1_OCTET_STRING_free(os);
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| 33 | }
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| 34 | }
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| 35 |
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| 36 | static int hmac_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
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| 37 | {
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| 38 | switch (op) {
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| 39 | case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
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| 40 | *(int *)arg2 = NID_sha256;
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| 41 | return 1;
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| 42 |
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| 43 | default:
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| 44 | return -2;
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| 45 | }
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| 46 | }
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| 47 |
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| 48 | static int hmac_pkey_public_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
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| 49 | {
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| 50 | /* the ameth pub_cmp must return 1 on match, 0 on mismatch */
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| 51 | return ASN1_OCTET_STRING_cmp(EVP_PKEY_get0(a), EVP_PKEY_get0(b)) == 0;
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| 52 | }
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| 53 |
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| 54 | static int hmac_set_priv_key(EVP_PKEY *pkey, const unsigned char *priv,
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| 55 | size_t len)
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| 56 | {
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| 57 | ASN1_OCTET_STRING *os;
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| 58 |
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| 59 | if (pkey->pkey.ptr != NULL)
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| 60 | return 0;
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| 61 |
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| 62 | os = ASN1_OCTET_STRING_new();
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| 63 | if (os == NULL)
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| 64 | return 0;
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| 65 |
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| 66 |
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| 67 | if (!ASN1_OCTET_STRING_set(os, priv, len)) {
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| 68 | ASN1_OCTET_STRING_free(os);
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| 69 | return 0;
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| 70 | }
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| 71 |
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| 72 | pkey->pkey.ptr = os;
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| 73 | return 1;
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| 74 | }
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| 75 |
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| 76 | static int hmac_get_priv_key(const EVP_PKEY *pkey, unsigned char *priv,
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| 77 | size_t *len)
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| 78 | {
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| 79 | ASN1_OCTET_STRING *os = (ASN1_OCTET_STRING *)pkey->pkey.ptr;
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| 80 |
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| 81 | if (priv == NULL) {
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| 82 | *len = ASN1_STRING_length(os);
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| 83 | return 1;
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| 84 | }
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| 85 |
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| 86 | if (os == NULL || *len < (size_t)ASN1_STRING_length(os))
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| 87 | return 0;
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| 88 |
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| 89 | *len = ASN1_STRING_length(os);
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| 90 | memcpy(priv, ASN1_STRING_get0_data(os), *len);
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| 91 |
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| 92 | return 1;
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| 93 | }
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| 94 |
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| 95 | const EVP_PKEY_ASN1_METHOD hmac_asn1_meth = {
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| 96 | EVP_PKEY_HMAC,
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| 97 | EVP_PKEY_HMAC,
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| 98 | 0,
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| 99 |
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| 100 | "HMAC",
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| 101 | "OpenSSL HMAC method",
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| 102 |
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| 103 | 0, 0, hmac_pkey_public_cmp, 0,
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| 104 |
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| 105 | 0, 0, 0,
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| 106 |
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| 107 | hmac_size,
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| 108 | 0, 0,
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| 109 | 0, 0, 0, 0, 0, 0, 0,
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| 110 |
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| 111 | hmac_key_free,
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| 112 | hmac_pkey_ctrl,
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| 113 | NULL,
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| 114 | NULL,
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| 115 |
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| 116 | NULL,
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| 117 | NULL,
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| 118 | NULL,
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| 119 |
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| 120 | NULL,
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| 121 | NULL,
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| 122 | NULL,
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| 123 |
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| 124 | hmac_set_priv_key,
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| 125 | NULL,
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| 126 | hmac_get_priv_key,
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| 127 | NULL,
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| 128 | };
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