1 | /*
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2 | * Copyright 2007-2018 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 | return ASN1_OCTET_STRING_cmp(EVP_PKEY_get0(a), EVP_PKEY_get0(b));
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51 | }
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52 |
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53 | static int hmac_set_priv_key(EVP_PKEY *pkey, const unsigned char *priv,
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54 | size_t len)
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55 | {
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56 | ASN1_OCTET_STRING *os;
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57 |
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58 | if (pkey->pkey.ptr != NULL)
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59 | return 0;
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60 |
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61 | os = ASN1_OCTET_STRING_new();
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62 | if (os == NULL)
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63 | return 0;
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64 |
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65 |
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66 | if (!ASN1_OCTET_STRING_set(os, priv, len)) {
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67 | ASN1_OCTET_STRING_free(os);
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68 | return 0;
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69 | }
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70 |
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71 | pkey->pkey.ptr = os;
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72 | return 1;
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73 | }
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74 |
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75 | static int hmac_get_priv_key(const EVP_PKEY *pkey, unsigned char *priv,
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76 | size_t *len)
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77 | {
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78 | ASN1_OCTET_STRING *os = (ASN1_OCTET_STRING *)pkey->pkey.ptr;
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79 |
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80 | if (priv == NULL) {
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81 | *len = ASN1_STRING_length(os);
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82 | return 1;
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83 | }
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84 |
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85 | if (os == NULL || *len < (size_t)ASN1_STRING_length(os))
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86 | return 0;
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87 |
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88 | *len = ASN1_STRING_length(os);
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89 | memcpy(priv, ASN1_STRING_get0_data(os), *len);
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90 |
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91 | return 1;
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92 | }
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93 |
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94 | const EVP_PKEY_ASN1_METHOD hmac_asn1_meth = {
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95 | EVP_PKEY_HMAC,
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96 | EVP_PKEY_HMAC,
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97 | 0,
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98 |
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99 | "HMAC",
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100 | "OpenSSL HMAC method",
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101 |
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102 | 0, 0, hmac_pkey_public_cmp, 0,
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103 |
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104 | 0, 0, 0,
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105 |
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106 | hmac_size,
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107 | 0, 0,
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108 | 0, 0, 0, 0, 0, 0, 0,
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109 |
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110 | hmac_key_free,
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111 | hmac_pkey_ctrl,
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112 | NULL,
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113 | NULL,
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114 |
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115 | NULL,
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116 | NULL,
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117 | NULL,
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118 |
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119 | NULL,
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120 | NULL,
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121 | NULL,
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122 |
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123 | hmac_set_priv_key,
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124 | NULL,
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125 | hmac_get_priv_key,
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126 | NULL,
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127 | };
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