| yuezonghe | 824eb0c | 2024-06-27 02:32:26 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2007-2021 The OpenSSL Project Authors. All Rights Reserved. |
| 3 | * |
| 4 | * Licensed under the OpenSSL license (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/evp.h> |
| 13 | #include "crypto/asn1.h" |
| 14 | #include "crypto/evp.h" |
| 15 | |
| 16 | /* |
| 17 | * HMAC "ASN1" method. This is just here to indicate the maximum HMAC output |
| 18 | * length and to free up an HMAC key. |
| 19 | */ |
| 20 | |
| 21 | static int hmac_size(const EVP_PKEY *pkey) |
| 22 | { |
| 23 | return EVP_MAX_MD_SIZE; |
| 24 | } |
| 25 | |
| 26 | static void hmac_key_free(EVP_PKEY *pkey) |
| 27 | { |
| 28 | ASN1_OCTET_STRING *os = EVP_PKEY_get0(pkey); |
| 29 | if (os) { |
| 30 | if (os->data) |
| 31 | OPENSSL_cleanse(os->data, os->length); |
| 32 | ASN1_OCTET_STRING_free(os); |
| 33 | } |
| 34 | } |
| 35 | |
| 36 | static int hmac_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2) |
| 37 | { |
| 38 | switch (op) { |
| 39 | case ASN1_PKEY_CTRL_DEFAULT_MD_NID: |
| 40 | *(int *)arg2 = NID_sha256; |
| 41 | return 1; |
| 42 | |
| 43 | default: |
| 44 | return -2; |
| 45 | } |
| 46 | } |
| 47 | |
| 48 | static int hmac_pkey_public_cmp(const EVP_PKEY *a, const EVP_PKEY *b) |
| 49 | { |
| 50 | /* the ameth pub_cmp must return 1 on match, 0 on mismatch */ |
| 51 | return ASN1_OCTET_STRING_cmp(EVP_PKEY_get0(a), EVP_PKEY_get0(b)) == 0; |
| 52 | } |
| 53 | |
| 54 | static int hmac_set_priv_key(EVP_PKEY *pkey, const unsigned char *priv, |
| 55 | size_t len) |
| 56 | { |
| 57 | ASN1_OCTET_STRING *os; |
| 58 | |
| 59 | if (pkey->pkey.ptr != NULL) |
| 60 | return 0; |
| 61 | |
| 62 | os = ASN1_OCTET_STRING_new(); |
| 63 | if (os == NULL) |
| 64 | return 0; |
| 65 | |
| 66 | |
| 67 | if (!ASN1_OCTET_STRING_set(os, priv, len)) { |
| 68 | ASN1_OCTET_STRING_free(os); |
| 69 | return 0; |
| 70 | } |
| 71 | |
| 72 | pkey->pkey.ptr = os; |
| 73 | return 1; |
| 74 | } |
| 75 | |
| 76 | static int hmac_get_priv_key(const EVP_PKEY *pkey, unsigned char *priv, |
| 77 | size_t *len) |
| 78 | { |
| 79 | ASN1_OCTET_STRING *os = (ASN1_OCTET_STRING *)pkey->pkey.ptr; |
| 80 | |
| 81 | if (priv == NULL) { |
| 82 | *len = ASN1_STRING_length(os); |
| 83 | return 1; |
| 84 | } |
| 85 | |
| 86 | if (os == NULL || *len < (size_t)ASN1_STRING_length(os)) |
| 87 | return 0; |
| 88 | |
| 89 | *len = ASN1_STRING_length(os); |
| 90 | memcpy(priv, ASN1_STRING_get0_data(os), *len); |
| 91 | |
| 92 | return 1; |
| 93 | } |
| 94 | |
| 95 | const EVP_PKEY_ASN1_METHOD hmac_asn1_meth = { |
| 96 | EVP_PKEY_HMAC, |
| 97 | EVP_PKEY_HMAC, |
| 98 | 0, |
| 99 | |
| 100 | "HMAC", |
| 101 | "OpenSSL HMAC method", |
| 102 | |
| 103 | 0, 0, hmac_pkey_public_cmp, 0, |
| 104 | |
| 105 | 0, 0, 0, |
| 106 | |
| 107 | hmac_size, |
| 108 | 0, 0, |
| 109 | 0, 0, 0, 0, 0, 0, 0, |
| 110 | |
| 111 | hmac_key_free, |
| 112 | hmac_pkey_ctrl, |
| 113 | NULL, |
| 114 | NULL, |
| 115 | |
| 116 | NULL, |
| 117 | NULL, |
| 118 | NULL, |
| 119 | |
| 120 | NULL, |
| 121 | NULL, |
| 122 | NULL, |
| 123 | |
| 124 | hmac_set_priv_key, |
| 125 | NULL, |
| 126 | hmac_get_priv_key, |
| 127 | NULL, |
| 128 | }; |