0d124b0a51
Only applies to algorithms that support it. Both raw private and public keys can be obtained for X25519, Ed25519, X448, Ed448. Raw private keys only can be obtained for HMAC, Poly1305 and SipHash Fixes #6259 Reviewed-by: Rich Salz <rsalz@openssl.org> Reviewed-by: Tim Hudson <tjh@openssl.org> (Merged from https://github.com/openssl/openssl/pull/6394)
127 lines
2.5 KiB
C
127 lines
2.5 KiB
C
/*
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* Copyright 2007-2018 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <stdio.h>
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#include "internal/cryptlib.h"
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#include <openssl/evp.h>
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#include "internal/asn1_int.h"
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#include "internal/evp_int.h"
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/*
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* HMAC "ASN1" method. This is just here to indicate the maximum HMAC output
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* length and to free up an HMAC key.
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*/
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static int hmac_size(const EVP_PKEY *pkey)
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{
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return EVP_MAX_MD_SIZE;
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}
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static void hmac_key_free(EVP_PKEY *pkey)
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{
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ASN1_OCTET_STRING *os = EVP_PKEY_get0(pkey);
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if (os) {
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if (os->data)
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OPENSSL_cleanse(os->data, os->length);
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ASN1_OCTET_STRING_free(os);
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}
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}
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static int hmac_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
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{
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switch (op) {
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case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
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*(int *)arg2 = NID_sha256;
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return 1;
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default:
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return -2;
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}
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}
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static int hmac_pkey_public_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
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{
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return ASN1_OCTET_STRING_cmp(EVP_PKEY_get0(a), EVP_PKEY_get0(b));
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}
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static int hmac_set_priv_key(EVP_PKEY *pkey, const unsigned char *priv,
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size_t len)
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{
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ASN1_OCTET_STRING *os;
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if (pkey->pkey.ptr != NULL)
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return 0;
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os = ASN1_OCTET_STRING_new();
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if (os == NULL)
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return 0;
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if (!ASN1_OCTET_STRING_set(os, priv, len)) {
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ASN1_OCTET_STRING_free(os);
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return 0;
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}
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pkey->pkey.ptr = os;
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return 1;
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}
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static int hmac_get_priv_key(const EVP_PKEY *pkey, unsigned char *priv,
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size_t *len)
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{
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ASN1_OCTET_STRING *os = (ASN1_OCTET_STRING *)pkey->pkey.ptr;
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if (priv == NULL) {
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*len = ASN1_STRING_length(os);
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return 1;
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}
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if (os == NULL || *len < (size_t)ASN1_STRING_length(os))
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return 0;
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*len = ASN1_STRING_length(os);
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memcpy(priv, ASN1_STRING_get0_data(os), *len);
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return 1;
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}
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const EVP_PKEY_ASN1_METHOD hmac_asn1_meth = {
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EVP_PKEY_HMAC,
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EVP_PKEY_HMAC,
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0,
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"HMAC",
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"OpenSSL HMAC method",
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0, 0, hmac_pkey_public_cmp, 0,
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0, 0, 0,
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hmac_size,
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0, 0,
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0, 0, 0, 0, 0, 0, 0,
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hmac_key_free,
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hmac_pkey_ctrl,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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hmac_set_priv_key,
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NULL,
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hmac_get_priv_key,
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NULL,
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};
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