2 * Copyright 2007-2018 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (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
11 #include "internal/cryptlib.h"
12 #include <openssl/evp.h>
13 #include "crypto/asn1.h"
14 #include "crypto/poly1305.h"
15 #include "crypto/evp.h"
18 * POLY1305 "ASN1" method. This is just here to indicate the maximum
19 * POLY1305 output length and to free up a POLY1305 key.
22 static int poly1305_size(const EVP_PKEY *pkey)
24 return POLY1305_DIGEST_SIZE;
27 static void poly1305_key_free(EVP_PKEY *pkey)
29 ASN1_OCTET_STRING *os = EVP_PKEY_get0(pkey);
32 OPENSSL_cleanse(os->data, os->length);
33 ASN1_OCTET_STRING_free(os);
37 static int poly1305_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
39 /* nothing, (including ASN1_PKEY_CTRL_DEFAULT_MD_NID), is supported */
43 static int poly1305_pkey_public_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
45 return ASN1_OCTET_STRING_cmp(EVP_PKEY_get0(a), EVP_PKEY_get0(b));
48 static int poly1305_set_priv_key(EVP_PKEY *pkey, const unsigned char *priv,
51 ASN1_OCTET_STRING *os;
53 if (pkey->pkey.ptr != NULL || len != POLY1305_KEY_SIZE)
56 os = ASN1_OCTET_STRING_new();
60 if (!ASN1_OCTET_STRING_set(os, priv, len)) {
61 ASN1_OCTET_STRING_free(os);
69 static int poly1305_get_priv_key(const EVP_PKEY *pkey, unsigned char *priv,
72 ASN1_OCTET_STRING *os = (ASN1_OCTET_STRING *)pkey->pkey.ptr;
75 *len = POLY1305_KEY_SIZE;
79 if (os == NULL || *len < POLY1305_KEY_SIZE)
82 memcpy(priv, ASN1_STRING_get0_data(os), ASN1_STRING_length(os));
83 *len = POLY1305_KEY_SIZE;
88 const EVP_PKEY_ASN1_METHOD poly1305_asn1_meth = {
94 "OpenSSL POLY1305 method",
96 0, 0, poly1305_pkey_public_cmp, 0,
117 poly1305_set_priv_key,
119 poly1305_get_priv_key,