2 * Copyright 2007-2018 The OpenSSL Project Authors. All Rights Reserved.
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
11 #include "internal/cryptlib.h"
12 #include <openssl/evp.h>
13 #include "internal/asn1_int.h"
14 #include "internal/poly1305.h"
15 #include "poly1305_local.h"
16 #include "internal/evp_int.h"
19 * POLY1305 "ASN1" method. This is just here to indicate the maximum
20 * POLY1305 output length and to free up a POLY1305 key.
23 static int poly1305_size(const EVP_PKEY *pkey)
25 return POLY1305_DIGEST_SIZE;
28 static void poly1305_key_free(EVP_PKEY *pkey)
30 ASN1_OCTET_STRING *os = EVP_PKEY_get0(pkey);
33 OPENSSL_cleanse(os->data, os->length);
34 ASN1_OCTET_STRING_free(os);
38 static int poly1305_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
40 /* nothing, (including ASN1_PKEY_CTRL_DEFAULT_MD_NID), is supported */
44 static int poly1305_pkey_public_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
46 return ASN1_OCTET_STRING_cmp(EVP_PKEY_get0(a), EVP_PKEY_get0(b));
49 static int poly1305_set_priv_key(EVP_PKEY *pkey, const unsigned char *priv,
52 ASN1_OCTET_STRING *os;
54 if (pkey->pkey.ptr != NULL || len != POLY1305_KEY_SIZE)
57 os = ASN1_OCTET_STRING_new();
61 if (!ASN1_OCTET_STRING_set(os, priv, len)) {
62 ASN1_OCTET_STRING_free(os);
70 static int poly1305_get_priv_key(const EVP_PKEY *pkey, unsigned char *priv,
73 ASN1_OCTET_STRING *os = (ASN1_OCTET_STRING *)pkey->pkey.ptr;
76 *len = POLY1305_KEY_SIZE;
80 if (os == NULL || *len < POLY1305_KEY_SIZE)
83 memcpy(priv, ASN1_STRING_get0_data(os), ASN1_STRING_length(os));
84 *len = POLY1305_KEY_SIZE;
89 const EVP_PKEY_ASN1_METHOD poly1305_asn1_meth = {
95 "OpenSSL POLY1305 method",
97 0, 0, poly1305_pkey_public_cmp, 0,
118 poly1305_set_priv_key,
120 poly1305_get_priv_key,