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/*
* Copyright 1998-2021 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <stddef.h>
#include <openssl/x509.h>
#include <openssl/asn1.h>
#include <openssl/asn1t.h>
#include <openssl/err.h>
#include "crypto/asn1.h"
#include "crypto/evp.h"
ASN1_SEQUENCE(X509_ALGOR) = {
ASN1_SIMPLE(X509_ALGOR, algorithm, ASN1_OBJECT),
ASN1_OPT(X509_ALGOR, parameter, ASN1_ANY)
} ASN1_SEQUENCE_END(X509_ALGOR)
ASN1_ITEM_TEMPLATE(X509_ALGORS) =
ASN1_EX_TEMPLATE_TYPE(ASN1_TFLG_SEQUENCE_OF, 0, algorithms, X509_ALGOR)
ASN1_ITEM_TEMPLATE_END(X509_ALGORS)
IMPLEMENT_ASN1_FUNCTIONS(X509_ALGOR)
IMPLEMENT_ASN1_ENCODE_FUNCTIONS_fname(X509_ALGORS, X509_ALGORS, X509_ALGORS)
IMPLEMENT_ASN1_DUP_FUNCTION(X509_ALGOR)
int X509_ALGOR_set0(X509_ALGOR *alg, ASN1_OBJECT *aobj, int ptype, void *pval)
{
if (alg == NULL)
return 0;
if (ptype != V_ASN1_UNDEF && alg->parameter == NULL
&& (alg->parameter = ASN1_TYPE_new()) == NULL)
return 0;
ASN1_OBJECT_free(alg->algorithm);
alg->algorithm = aobj;
if (ptype == V_ASN1_EOC)
return 1;
if (ptype == V_ASN1_UNDEF) {
ASN1_TYPE_free(alg->parameter);
alg->parameter = NULL;
} else
ASN1_TYPE_set(alg->parameter, ptype, pval);
return 1;
}
X509_ALGOR *ossl_X509_ALGOR_from_nid(int nid, int ptype, void *pval)
{
ASN1_OBJECT *algo = OBJ_nid2obj(nid);
X509_ALGOR *alg = NULL;
if (algo == NULL)
return NULL;
if ((alg = X509_ALGOR_new()) == NULL)
goto err;
if (X509_ALGOR_set0(alg, algo, ptype, pval))
return alg;
alg->algorithm = NULL; /* precaution to prevent double free */
err:
X509_ALGOR_free(alg);
/* ASN1_OBJECT_free(algo) is not needed due to OBJ_nid2obj() */
return NULL;
}
void X509_ALGOR_get0(const ASN1_OBJECT **paobj, int *pptype,
const void **ppval, const X509_ALGOR *algor)
{
if (paobj)
*paobj = algor->algorithm;
if (pptype) {
if (algor->parameter == NULL) {
*pptype = V_ASN1_UNDEF;
return;
} else
*pptype = algor->parameter->type;
if (ppval)
*ppval = algor->parameter->value.ptr;
}
}
/* Set up an X509_ALGOR DigestAlgorithmIdentifier from an EVP_MD */
void X509_ALGOR_set_md(X509_ALGOR *alg, const EVP_MD *md)
{
int type = md->flags & EVP_MD_FLAG_DIGALGID_ABSENT ? V_ASN1_UNDEF
: V_ASN1_NULL;
(void)X509_ALGOR_set0(alg, OBJ_nid2obj(EVP_MD_get_type(md)), type, NULL);
}
int X509_ALGOR_cmp(const X509_ALGOR *a, const X509_ALGOR *b)
{
int rv;
rv = OBJ_cmp(a->algorithm, b->algorithm);
if (rv)
return rv;
if (!a->parameter && !b->parameter)
return 0;
return ASN1_TYPE_cmp(a->parameter, b->parameter);
}
int X509_ALGOR_copy(X509_ALGOR *dest, const X509_ALGOR *src)
{
if (src == NULL || dest == NULL)
return 0;
if (dest->algorithm)
ASN1_OBJECT_free(dest->algorithm);
dest->algorithm = NULL;
if (dest->parameter)
ASN1_TYPE_free(dest->parameter);
dest->parameter = NULL;
if (src->algorithm)
if ((dest->algorithm = OBJ_dup(src->algorithm)) == NULL)
return 0;
if (src->parameter != NULL) {
dest->parameter = ASN1_TYPE_new();
if (dest->parameter == NULL)
return 0;
/* Assuming this is also correct for a BOOL.
* set does copy as a side effect.
*/
if (ASN1_TYPE_set1(dest->parameter, src->parameter->type,
src->parameter->value.ptr) == 0)
return 0;
}
return 1;
}
/* allocate and set algorithm ID from EVP_MD, default SHA1 */
int ossl_x509_algor_new_from_md(X509_ALGOR **palg, const EVP_MD *md)
{
X509_ALGOR *alg;
/* Default is SHA1 so no need to create it - still success */
if (md == NULL || EVP_MD_is_a(md, "SHA1"))
return 1;
if ((alg = X509_ALGOR_new()) == NULL)
return 0;
X509_ALGOR_set_md(alg, md);
*palg = alg;
return 1;
}
/* convert algorithm ID to EVP_MD, default SHA1 */
const EVP_MD *ossl_x509_algor_get_md(X509_ALGOR *alg)
{
const EVP_MD *md;
if (alg == NULL)
return EVP_sha1();
md = EVP_get_digestbyobj(alg->algorithm);
if (md == NULL)
ERR_raise(ERR_LIB_ASN1, ASN1_R_UNKNOWN_DIGEST);
return md;
}
X509_ALGOR *ossl_x509_algor_mgf1_decode(X509_ALGOR *alg)
{
if (OBJ_obj2nid(alg->algorithm) != NID_mgf1)
return NULL;
return ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(X509_ALGOR),
alg->parameter);
}
/* Allocate and set MGF1 algorithm ID from EVP_MD */
int ossl_x509_algor_md_to_mgf1(X509_ALGOR **palg, const EVP_MD *mgf1md)
{
X509_ALGOR *algtmp = NULL;
ASN1_STRING *stmp = NULL;
*palg = NULL;
if (mgf1md == NULL || EVP_MD_is_a(mgf1md, "SHA1"))
return 1;
/* need to embed algorithm ID inside another */
if (!ossl_x509_algor_new_from_md(&algtmp, mgf1md))
goto err;
if (ASN1_item_pack(algtmp, ASN1_ITEM_rptr(X509_ALGOR), &stmp) == NULL)
goto err;
*palg = ossl_X509_ALGOR_from_nid(NID_mgf1, V_ASN1_SEQUENCE, stmp);
if (*palg == NULL)
goto err;
stmp = NULL;
err:
ASN1_STRING_free(stmp);
X509_ALGOR_free(algtmp);
return *palg != NULL;
}
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