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X509_digest_sig(): Improve default hash for EdDSA and allow to return the chosen default

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Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/15762)
This commit is contained in:
Dr. David von Oheimb 2021-06-15 13:00:38 +02:00 committed by Matt Caswell
parent 6882652e65
commit eefdb8e013
5 changed files with 58 additions and 23 deletions
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2
apps/lib/cmp_mock_srv.c
View File

@ -347,7 +347,7 @@ static int process_certConf(OSSL_CMP_SRV_CTX *srv_ctx,
return 0;
}
if ((digest = X509_digest_sig(ctx->certOut)) == NULL)
if ((digest = X509_digest_sig(ctx->certOut, NULL, NULL)) == NULL)
return 0;
if (ASN1_OCTET_STRING_cmp(certHash, digest) != 0) {
ASN1_OCTET_STRING_free(digest);

7
crypto/cmp/cmp_msg.c
View File

@ -810,10 +810,11 @@ OSSL_CMP_MSG *ossl_cmp_certConf_new(OSSL_CMP_CTX *ctx, int fail_info,
if (!ASN1_INTEGER_set(certStatus->certReqId, OSSL_CMP_CERTREQID))
goto err;
/*
* the hash of the certificate, using the same hash algorithm
* as is used to create and verify the certificate signature
* The hash of the certificate, using the same hash algorithm
* as is used to create and verify the certificate signature.
* If not available, a default hash algorithm is used.
*/
if ((certHash = X509_digest_sig(ctx->newCert)) == NULL)
if ((certHash = X509_digest_sig(ctx->newCert, NULL, NULL)) == NULL)
goto err;
if (!ossl_cmp_certstatus_set0_certHash(certStatus, certHash))

40
crypto/x509/x_all.c
View File

@ -434,13 +434,20 @@ int X509_digest(const X509 *cert, const EVP_MD *md, unsigned char *data,
}
/* calculate cert digest using the same hash algorithm as in its signature */
ASN1_OCTET_STRING *X509_digest_sig(const X509 *cert)
ASN1_OCTET_STRING *X509_digest_sig(const X509 *cert,
EVP_MD **md_used, int *md_is_fallback)
{
unsigned int len;
unsigned char hash[EVP_MAX_MD_SIZE];
int mdnid, pknid;
EVP_MD *md = NULL;
ASN1_OCTET_STRING *new = NULL;
const char *md_name;
ASN1_OCTET_STRING *new;
if (md_used != NULL)
*md_used = NULL;
if (md_is_fallback != NULL)
*md_is_fallback = 0;
if (cert == NULL) {
ERR_raise(ERR_LIB_X509, ERR_R_PASSED_NULL_PARAMETER);
@ -474,10 +481,23 @@ ASN1_OCTET_STRING *X509_digest_sig(const X509 *cert)
/* Error code from fetch is sufficient */
return NULL;
} else if (pknid != NID_undef) {
/* Default to SHA-256 for known algorithms without a digest */
if ((md = EVP_MD_fetch(cert->libctx, "SHA256",
/* A known algorithm, but without a digest */
switch (pknid) {
case NID_ED25519: /* Follow CMS default given in RFC8419 */
md_name = "SHA512";
break;
case NID_ED448: /* Follow CMS default given in RFC8419 */
md_name = "SHAKE256";
break;
default: /* Fall back to SHA-256 */
md_name = "SHA256";
break;
}
if ((md = EVP_MD_fetch(cert->libctx, md_name,
cert->propq)) == NULL)
return NULL;
if (md_is_fallback != NULL)
*md_is_fallback = 1;
} else {
/* A completely unknown algorithm */
ERR_raise(ERR_LIB_X509, X509_R_UNSUPPORTED_ALGORITHM);
@ -492,13 +512,17 @@ ASN1_OCTET_STRING *X509_digest_sig(const X509 *cert)
if (!X509_digest(cert, md, hash, &len)
|| (new = ASN1_OCTET_STRING_new()) == NULL)
goto err;
if (!(ASN1_OCTET_STRING_set(new, hash, len))) {
ASN1_OCTET_STRING_free(new);
new = NULL;
if ((ASN1_OCTET_STRING_set(new, hash, len))) {
if (md_used != NULL)
*md_used = md;
else
EVP_MD_free(md);
return new;
}
ASN1_OCTET_STRING_free(new);
err:
EVP_MD_free(md);
return new;
return NULL;
}
int X509_CRL_digest(const X509_CRL *data, const EVP_MD *type,

29
doc/man3/X509_digest.pod
View File

@ -17,7 +17,8 @@ PKCS7_ISSUER_AND_SERIAL_digest
int X509_digest(const X509 *data, const EVP_MD *type, unsigned char *md,
unsigned int *len);
ASN1_OCTET_STRING *X509_digest_sig(const X509 *cert);
ASN1_OCTET_STRING *X509_digest_sig(const X509 *cert,
EVP_MD **md_used, int *md_is_fallback);
int X509_CRL_digest(const X509_CRL *data, const EVP_MD *type, unsigned char *md,
unsigned int *len);
@ -39,21 +40,29 @@ PKCS7_ISSUER_AND_SERIAL_digest
=head1 DESCRIPTION
X509_digest_sig() calculates a digest of the given certificate
using the same hash algorithm as in its signature with a fallback to B<SHA-256>
for algorithms where the digest is an integral part of the signature algorithm
such as with B<EdDSA> signatures.
X509_digest_sig() calculates a digest of the given certificate I<cert>
using the same hash algorithm as in its signature, if the digest
is an integral part of the certificate signature algorithm identifier.
Otherwise, a fallback hash algorithm is determined as follows:
SHA512 if the signature alorithm is ED25519,
SHAKE256 if it is ED448, otherwise SHA256.
The output parmeters are assigned as follows.
Unless I<md_used> is NULL, the hash algorithm used is provided
in I<*md_used> and must be freed by the caller (if it is not NULL).
Unless I<md_is_fallback> is NULL,
the I<*md_is_fallback> is set to 1 if the hash algorithm used is a fallback,
otherwise to 0.
X509_pubkey_digest() returns a digest of the DER representation of the public
key in the specified X509 B<data> object.
key in the specified X509 I<data> object.
All other functions described here return a digest of the DER representation
of their entire B<data> objects.
of their entire I<data> objects.
The B<type> parameter specifies the digest to
be used, such as EVP_sha1(). The B<md> is a pointer to the buffer where the
The I<type> parameter specifies the digest to
be used, such as EVP_sha1(). The I<md> is a pointer to the buffer where the
digest will be copied and is assumed to be large enough; the constant
B<EVP_MAX_MD_SIZE> is suggested. The B<len> parameter, if not NULL, points
B<EVP_MAX_MD_SIZE> is suggested. The I<len> parameter, if not NULL, points
to a place where the digest size will be stored.
=head1 RETURN VALUES

3
include/openssl/x509.h.in
View File

@ -346,7 +346,8 @@ int X509_pubkey_digest(const X509 *data, const EVP_MD *type,
unsigned char *md, unsigned int *len);
int X509_digest(const X509 *data, const EVP_MD *type,
unsigned char *md, unsigned int *len);
ASN1_OCTET_STRING *X509_digest_sig(const X509 *cert);
ASN1_OCTET_STRING *X509_digest_sig(const X509 *cert,
EVP_MD **md_used, int *md_is_fallback);
int X509_CRL_digest(const X509_CRL *data, const EVP_MD *type,
unsigned char *md, unsigned int *len);
int X509_REQ_digest(const X509_REQ *data, const EVP_MD *type,