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openssl3/SOURCES/0089-PSS-salt-length-from-p...

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From 0879fac692cb1bff0ec4c196cb364d970ad3ecec Mon Sep 17 00:00:00 2001
From: Clemens Lang <cllang@redhat.com>
Date: Mon, 21 Nov 2022 14:33:57 +0100
Subject: [PATCH 2/3] Obtain PSS salt length from provider
Rather than computing the PSS salt length again in core using
ossl_rsa_ctx_to_pss_string, which calls rsa_ctx_to_pss and computes the
salt length, obtain it from the provider using the
OSSL_SIGNATURE_PARAM_ALGORITHM_ID param to handle the case where the
interpretation of the magic constants in the provider differs from that
of OpenSSL core.
Signed-off-by: Clemens Lang <cllang@redhat.com>
---
crypto/cms/cms_rsa.c | 19 +++++++++++++++----
crypto/rsa/rsa_ameth.c | 34 +++++++++++++++++++++-------------
2 files changed, 36 insertions(+), 17 deletions(-)
diff --git a/crypto/cms/cms_rsa.c b/crypto/cms/cms_rsa.c
index 20ed816918..997567fdbf 100644
--- a/crypto/cms/cms_rsa.c
+++ b/crypto/cms/cms_rsa.c
@@ -10,6 +10,7 @@
#include <assert.h>
#include <openssl/cms.h>
#include <openssl/err.h>
+#include <openssl/core_names.h>
#include "crypto/asn1.h"
#include "crypto/rsa.h"
#include "cms_local.h"
@@ -191,7 +192,10 @@ static int rsa_cms_sign(CMS_SignerInfo *si)
int pad_mode = RSA_PKCS1_PADDING;
X509_ALGOR *alg;
EVP_PKEY_CTX *pkctx = CMS_SignerInfo_get0_pkey_ctx(si);
- ASN1_STRING *os = NULL;
+ unsigned char aid[128];
+ const unsigned char *pp = aid;
+ size_t aid_len = 0;
+ OSSL_PARAM params[2];
CMS_SignerInfo_get0_algs(si, NULL, NULL, NULL, &alg);
if (pkctx != NULL) {
@@ -205,10 +209,17 @@ static int rsa_cms_sign(CMS_SignerInfo *si)
/* We don't support it */
if (pad_mode != RSA_PKCS1_PSS_PADDING)
return 0;
- os = ossl_rsa_ctx_to_pss_string(pkctx);
- if (os == NULL)
+
+ params[0] = OSSL_PARAM_construct_octet_string(
+ OSSL_SIGNATURE_PARAM_ALGORITHM_ID, aid, sizeof(aid));
+ params[1] = OSSL_PARAM_construct_end();
+
+ if (EVP_PKEY_CTX_get_params(pkctx, params) <= 0)
+ return 0;
+ if ((aid_len = params[0].return_size) == 0)
+ return 0;
+ if (d2i_X509_ALGOR(&alg, &pp, aid_len) == NULL)
return 0;
- X509_ALGOR_set0(alg, OBJ_nid2obj(EVP_PKEY_RSA_PSS), V_ASN1_SEQUENCE, os);
return 1;
}
diff --git a/crypto/rsa/rsa_ameth.c b/crypto/rsa/rsa_ameth.c
index c15554505b..61ec53d424 100644
--- a/crypto/rsa/rsa_ameth.c
+++ b/crypto/rsa/rsa_ameth.c
@@ -637,22 +637,30 @@ static int rsa_item_sign(EVP_MD_CTX *ctx, const ASN1_ITEM *it, const void *asn,
if (pad_mode == RSA_PKCS1_PADDING)
return 2;
if (pad_mode == RSA_PKCS1_PSS_PADDING) {
- ASN1_STRING *os1 = NULL;
- os1 = ossl_rsa_ctx_to_pss_string(pkctx);
- if (!os1)
+ unsigned char aid[128];
+ size_t aid_len = 0;
+ OSSL_PARAM params[2];
+
+ params[0] = OSSL_PARAM_construct_octet_string(
+ OSSL_SIGNATURE_PARAM_ALGORITHM_ID, aid, sizeof(aid));
+ params[1] = OSSL_PARAM_construct_end();
+
+ if (EVP_PKEY_CTX_get_params(pkctx, params) <= 0)
return 0;
- /* Duplicate parameters if we have to */
- if (alg2) {
- ASN1_STRING *os2 = ASN1_STRING_dup(os1);
- if (!os2) {
- ASN1_STRING_free(os1);
+ if ((aid_len = params[0].return_size) == 0)
+ return 0;
+
+ if (alg1 != NULL) {
+ const unsigned char *pp = aid;
+ if (d2i_X509_ALGOR(&alg1, &pp, aid_len) == NULL)
+ return 0;
+ }
+ if (alg2 != NULL) {
+ const unsigned char *pp = aid;
+ if (d2i_X509_ALGOR(&alg2, &pp, aid_len) == NULL)
return 0;
- }
- X509_ALGOR_set0(alg2, OBJ_nid2obj(EVP_PKEY_RSA_PSS),
- V_ASN1_SEQUENCE, os2);
}
- X509_ALGOR_set0(alg1, OBJ_nid2obj(EVP_PKEY_RSA_PSS),
- V_ASN1_SEQUENCE, os1);
+
return 3;
}
return 2;
--
2.38.1