| 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/poly1305.h" |
| 15 | #include "poly1305_local.h" |
| 16 | #include "crypto/evp.h" |
| 17 | |
| 18 | /* |
| 19 | * POLY1305 "ASN1" method. This is just here to indicate the maximum |
| 20 | * POLY1305 output length and to free up a POLY1305 key. |
| 21 | */ |
| 22 | |
| 23 | static int poly1305_size(const EVP_PKEY *pkey) |
| 24 | { |
| 25 | return POLY1305_DIGEST_SIZE; |
| 26 | } |
| 27 | |
| 28 | static void poly1305_key_free(EVP_PKEY *pkey) |
| 29 | { |
| 30 | ASN1_OCTET_STRING *os = EVP_PKEY_get0(pkey); |
| 31 | if (os != NULL) { |
| 32 | if (os->data != NULL) |
| 33 | OPENSSL_cleanse(os->data, os->length); |
| 34 | ASN1_OCTET_STRING_free(os); |
| 35 | } |
| 36 | } |
| 37 | |
| 38 | static int poly1305_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2) |
| 39 | { |
| 40 | /* nothing, (including ASN1_PKEY_CTRL_DEFAULT_MD_NID), is supported */ |
| 41 | return -2; |
| 42 | } |
| 43 | |
| 44 | static int poly1305_pkey_public_cmp(const EVP_PKEY *a, const EVP_PKEY *b) |
| 45 | { |
| 46 | return ASN1_OCTET_STRING_cmp(EVP_PKEY_get0(a), EVP_PKEY_get0(b)) == 0; |
| 47 | } |
| 48 | |
| 49 | static int poly1305_set_priv_key(EVP_PKEY *pkey, const unsigned char *priv, |
| 50 | size_t len) |
| 51 | { |
| 52 | ASN1_OCTET_STRING *os; |
| 53 | |
| 54 | if (pkey->pkey.ptr != NULL || len != POLY1305_KEY_SIZE) |
| 55 | return 0; |
| 56 | |
| 57 | os = ASN1_OCTET_STRING_new(); |
| 58 | if (os == NULL) |
| 59 | return 0; |
| 60 | |
| 61 | if (!ASN1_OCTET_STRING_set(os, priv, len)) { |
| 62 | ASN1_OCTET_STRING_free(os); |
| 63 | return 0; |
| 64 | } |
| 65 | |
| 66 | pkey->pkey.ptr = os; |
| 67 | return 1; |
| 68 | } |
| 69 | |
| 70 | static int poly1305_get_priv_key(const EVP_PKEY *pkey, unsigned char *priv, |
| 71 | size_t *len) |
| 72 | { |
| 73 | ASN1_OCTET_STRING *os = (ASN1_OCTET_STRING *)pkey->pkey.ptr; |
| 74 | |
| 75 | if (priv == NULL) { |
| 76 | *len = POLY1305_KEY_SIZE; |
| 77 | return 1; |
| 78 | } |
| 79 | |
| 80 | if (os == NULL || *len < POLY1305_KEY_SIZE) |
| 81 | return 0; |
| 82 | |
| 83 | memcpy(priv, ASN1_STRING_get0_data(os), ASN1_STRING_length(os)); |
| 84 | *len = POLY1305_KEY_SIZE; |
| 85 | |
| 86 | return 1; |
| 87 | } |
| 88 | |
| 89 | const EVP_PKEY_ASN1_METHOD poly1305_asn1_meth = { |
| 90 | EVP_PKEY_POLY1305, |
| 91 | EVP_PKEY_POLY1305, |
| 92 | 0, |
| 93 | |
| 94 | "POLY1305", |
| 95 | "OpenSSL POLY1305 method", |
| 96 | |
| 97 | 0, 0, poly1305_pkey_public_cmp, 0, |
| 98 | |
| 99 | 0, 0, 0, |
| 100 | |
| 101 | poly1305_size, |
| 102 | 0, 0, |
| 103 | 0, 0, 0, 0, 0, 0, 0, |
| 104 | |
| 105 | poly1305_key_free, |
| 106 | poly1305_pkey_ctrl, |
| 107 | NULL, |
| 108 | NULL, |
| 109 | |
| 110 | NULL, |
| 111 | NULL, |
| 112 | NULL, |
| 113 | |
| 114 | NULL, |
| 115 | NULL, |
| 116 | NULL, |
| 117 | |
| 118 | poly1305_set_priv_key, |
| 119 | NULL, |
| 120 | poly1305_get_priv_key, |
| 121 | NULL, |
| 122 | }; |