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openssl/providers/implementations/signature/rsa_sig.c
pohsingwu f3c03be3ad Restrict salt length for RSA-PSS in the FIPS provider 
Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/25115)
2024-08-13 09:55:36 +10:00

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/*
* Copyright 2019-2023 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
*/
/*
* RSA low level APIs are deprecated for public use, but still ok for
* internal use.
*/
#include "internal/deprecated.h"
#include <string.h>
#include <openssl/crypto.h>
#include <openssl/core_dispatch.h>
#include <openssl/core_names.h>
#include <openssl/err.h>
#include <openssl/rsa.h>
#include <openssl/params.h>
#include <openssl/evp.h>
#include <openssl/proverr.h>
#include "internal/cryptlib.h"
#include "internal/nelem.h"
#include "internal/sizes.h"
#include "crypto/rsa.h"
#include "prov/providercommon.h"
#include "prov/implementations.h"
#include "prov/provider_ctx.h"
#include "prov/der_rsa.h"
#include "prov/securitycheck.h"
#include "prov/fipsindicator.h"
#define RSA_DEFAULT_DIGEST_NAME OSSL_DIGEST_NAME_SHA1
static OSSL_FUNC_signature_newctx_fn rsa_newctx;
static OSSL_FUNC_signature_sign_init_fn rsa_sign_init;
static OSSL_FUNC_signature_verify_init_fn rsa_verify_init;
static OSSL_FUNC_signature_verify_recover_init_fn rsa_verify_recover_init;
static OSSL_FUNC_signature_sign_fn rsa_sign;
static OSSL_FUNC_signature_verify_fn rsa_verify;
static OSSL_FUNC_signature_verify_recover_fn rsa_verify_recover;
static OSSL_FUNC_signature_digest_sign_init_fn rsa_digest_sign_init;
static OSSL_FUNC_signature_digest_sign_update_fn rsa_digest_signverify_update;
static OSSL_FUNC_signature_digest_sign_final_fn rsa_digest_sign_final;
static OSSL_FUNC_signature_digest_verify_init_fn rsa_digest_verify_init;
static OSSL_FUNC_signature_digest_verify_update_fn rsa_digest_signverify_update;
static OSSL_FUNC_signature_digest_verify_final_fn rsa_digest_verify_final;
static OSSL_FUNC_signature_freectx_fn rsa_freectx;
static OSSL_FUNC_signature_dupctx_fn rsa_dupctx;
static OSSL_FUNC_signature_get_ctx_params_fn rsa_get_ctx_params;
static OSSL_FUNC_signature_gettable_ctx_params_fn rsa_gettable_ctx_params;
static OSSL_FUNC_signature_set_ctx_params_fn rsa_set_ctx_params;
static OSSL_FUNC_signature_settable_ctx_params_fn rsa_settable_ctx_params;
static OSSL_FUNC_signature_get_ctx_md_params_fn rsa_get_ctx_md_params;
static OSSL_FUNC_signature_gettable_ctx_md_params_fn rsa_gettable_ctx_md_params;
static OSSL_FUNC_signature_set_ctx_md_params_fn rsa_set_ctx_md_params;
static OSSL_FUNC_signature_settable_ctx_md_params_fn rsa_settable_ctx_md_params;
static OSSL_ITEM padding_item[] = {
{ RSA_PKCS1_PADDING, OSSL_PKEY_RSA_PAD_MODE_PKCSV15 },
{ RSA_NO_PADDING, OSSL_PKEY_RSA_PAD_MODE_NONE },
{ RSA_X931_PADDING, OSSL_PKEY_RSA_PAD_MODE_X931 },
{ RSA_PKCS1_PSS_PADDING, OSSL_PKEY_RSA_PAD_MODE_PSS },
{ 0, NULL }
};
/*
* What's passed as an actual key is defined by the KEYMGMT interface.
* We happen to know that our KEYMGMT simply passes RSA structures, so
* we use that here too.
*/
typedef struct {
OSSL_LIB_CTX *libctx;
char *propq;
RSA *rsa;
int operation;
/*
* Flag to determine if the hash function can be changed (1) or not (0)
* Because it's dangerous to change during a DigestSign or DigestVerify
* operation, this flag is cleared by their Init function, and set again
* by their Final function.
*/
unsigned int flag_allow_md : 1;
unsigned int mgf1_md_set : 1;
/* main digest */
EVP_MD *md;
EVP_MD_CTX *mdctx;
int mdnid;
char mdname[OSSL_MAX_NAME_SIZE]; /* Purely informational */
/* RSA padding mode */
int pad_mode;
/* message digest for MGF1 */
EVP_MD *mgf1_md;
int mgf1_mdnid;
char mgf1_mdname[OSSL_MAX_NAME_SIZE]; /* Purely informational */
/* PSS salt length */
int saltlen;
/* Minimum salt length or -1 if no PSS parameter restriction */
int min_saltlen;
/* Temp buffer */
unsigned char *tbuf;
OSSL_FIPS_IND_DECLARE
} PROV_RSA_CTX;
/* True if PSS parameters are restricted */
#define rsa_pss_restricted(prsactx) (prsactx->min_saltlen != -1)
static size_t rsa_get_md_size(const PROV_RSA_CTX *prsactx)
{
int md_size;
if (prsactx->md != NULL) {
md_size = EVP_MD_get_size(prsactx->md);
if (md_size <= 0)
return 0;
return md_size;
}
return 0;
}
static int rsa_check_padding(const PROV_RSA_CTX *prsactx,
const char *mdname, const char *mgf1_mdname,
int mdnid)
{
switch (prsactx->pad_mode) {
case RSA_NO_PADDING:
if (mdname != NULL || mdnid != NID_undef) {
ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_PADDING_MODE);
return 0;
}
break;
case RSA_X931_PADDING:
if (RSA_X931_hash_id(mdnid) == -1) {
ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_X931_DIGEST);
return 0;
}
break;
case RSA_PKCS1_PSS_PADDING:
if (rsa_pss_restricted(prsactx))
if ((mdname != NULL && !EVP_MD_is_a(prsactx->md, mdname))
|| (mgf1_mdname != NULL
&& !EVP_MD_is_a(prsactx->mgf1_md, mgf1_mdname))) {
ERR_raise(ERR_LIB_PROV, PROV_R_DIGEST_NOT_ALLOWED);
return 0;
}
break;
default:
break;
}
return 1;
}
static int rsa_check_parameters(PROV_RSA_CTX *prsactx, int min_saltlen)
{
if (prsactx->pad_mode == RSA_PKCS1_PSS_PADDING) {
int max_saltlen;
/* See if minimum salt length exceeds maximum possible */
max_saltlen = RSA_size(prsactx->rsa) - EVP_MD_get_size(prsactx->md);
if ((RSA_bits(prsactx->rsa) & 0x7) == 1)
max_saltlen--;
if (min_saltlen < 0 || min_saltlen > max_saltlen) {
ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_SALT_LENGTH);
return 0;
}
prsactx->min_saltlen = min_saltlen;
}
return 1;
}
static void *rsa_newctx(void *provctx, const char *propq)
{
PROV_RSA_CTX *prsactx = NULL;
char *propq_copy = NULL;
if (!ossl_prov_is_running())
return NULL;
if ((prsactx = OPENSSL_zalloc(sizeof(PROV_RSA_CTX))) == NULL
|| (propq != NULL
&& (propq_copy = OPENSSL_strdup(propq)) == NULL)) {
OPENSSL_free(prsactx);
return NULL;
}
OSSL_FIPS_IND_INIT(prsactx)
prsactx->libctx = PROV_LIBCTX_OF(provctx);
prsactx->flag_allow_md = 1;
prsactx->propq = propq_copy;
/* Maximum up to digest length for sign, auto for verify */
prsactx->saltlen = RSA_PSS_SALTLEN_AUTO_DIGEST_MAX;
prsactx->min_saltlen = -1;
return prsactx;
}
static int rsa_pss_compute_saltlen(PROV_RSA_CTX *ctx)
{
int saltlen = ctx->saltlen;
int saltlenMax = -1;
/* FIPS 186-4 section 5 "The RSA Digital Signature Algorithm", subsection
* 5.5 "PKCS #1" says: "For RSASSA-PSS […] the length (in bytes) of the
* salt (sLen) shall satisfy 0 <= sLen <= hLen, where hLen is the length of
* the hash function output block (in bytes)."
*
* Provide a way to use at most the digest length, so that the default does
* not violate FIPS 186-4. */
if (saltlen == RSA_PSS_SALTLEN_DIGEST) {
if ((saltlen = EVP_MD_get_size(ctx->md)) <= 0) {
ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_DIGEST);
return -1;
}
} else if (saltlen == RSA_PSS_SALTLEN_AUTO_DIGEST_MAX) {
saltlen = RSA_PSS_SALTLEN_MAX;
if ((saltlenMax = EVP_MD_get_size(ctx->md)) <= 0) {
ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_DIGEST);
return -1;
}
}
if (saltlen == RSA_PSS_SALTLEN_MAX || saltlen == RSA_PSS_SALTLEN_AUTO) {
int mdsize, rsasize;
if ((mdsize = EVP_MD_get_size(ctx->md)) <= 0) {
ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_DIGEST);
return -1;
}
if ((rsasize = RSA_size(ctx->rsa)) <= 2 || rsasize - 2 < mdsize) {
ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY);
return -1;
}
saltlen = rsasize - mdsize - 2;
if ((RSA_bits(ctx->rsa) & 0x7) == 1)
saltlen--;
if (saltlenMax >= 0 && saltlen > saltlenMax)
saltlen = saltlenMax;
}
if (saltlen < 0) {
ERR_raise(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR);
return -1;
} else if (saltlen < ctx->min_saltlen) {
ERR_raise_data(ERR_LIB_PROV, PROV_R_PSS_SALTLEN_TOO_SMALL,
"minimum salt length: %d, actual salt length: %d",
ctx->min_saltlen, saltlen);
return -1;
}
return saltlen;
}
static unsigned char *rsa_generate_signature_aid(PROV_RSA_CTX *ctx,
unsigned char *aid_buf,
size_t buf_len,
size_t *aid_len)
{
WPACKET pkt;
unsigned char *aid = NULL;
int saltlen;
RSA_PSS_PARAMS_30 pss_params;
int ret;
if (!WPACKET_init_der(&pkt, aid_buf, buf_len)) {
ERR_raise(ERR_LIB_PROV, ERR_R_CRYPTO_LIB);
return NULL;
}
switch (ctx->pad_mode) {
case RSA_PKCS1_PADDING:
ret = ossl_DER_w_algorithmIdentifier_MDWithRSAEncryption(&pkt, -1,
ctx->mdnid);
if (ret > 0) {
break;
} else if (ret == 0) {
ERR_raise(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR);
goto cleanup;
}
ERR_raise_data(ERR_LIB_PROV, ERR_R_UNSUPPORTED,
"Algorithm ID generation - md NID: %d",
ctx->mdnid);
goto cleanup;
case RSA_PKCS1_PSS_PADDING:
saltlen = rsa_pss_compute_saltlen(ctx);
if (saltlen < 0)
goto cleanup;
if (!ossl_rsa_pss_params_30_set_defaults(&pss_params)
|| !ossl_rsa_pss_params_30_set_hashalg(&pss_params, ctx->mdnid)
|| !ossl_rsa_pss_params_30_set_maskgenhashalg(&pss_params,
ctx->mgf1_mdnid)
|| !ossl_rsa_pss_params_30_set_saltlen(&pss_params, saltlen)
|| !ossl_DER_w_algorithmIdentifier_RSA_PSS(&pkt, -1,
RSA_FLAG_TYPE_RSASSAPSS,
&pss_params)) {
ERR_raise(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR);
goto cleanup;
}
break;
default:
ERR_raise_data(ERR_LIB_PROV, ERR_R_UNSUPPORTED,
"Algorithm ID generation - pad mode: %d",
ctx->pad_mode);
goto cleanup;
}
if (WPACKET_finish(&pkt)) {
WPACKET_get_total_written(&pkt, aid_len);
aid = WPACKET_get_curr(&pkt);
}
cleanup:
WPACKET_cleanup(&pkt);
return aid;
}
static int rsa_setup_md(PROV_RSA_CTX *ctx, const char *mdname,
const char *mdprops, const char *desc)
{
EVP_MD *md = NULL;
if (mdprops == NULL)
mdprops = ctx->propq;
if (mdname != NULL) {
int md_nid;
size_t mdname_len = strlen(mdname);
md = EVP_MD_fetch(ctx->libctx, mdname, mdprops);
if (md == NULL) {
ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,
"%s could not be fetched", mdname);
goto err;
}
md_nid = ossl_digest_rsa_sign_get_md_nid(md);
if (md_nid <= 0) {
ERR_raise_data(ERR_LIB_PROV, PROV_R_DIGEST_NOT_ALLOWED,
"digest=%s", mdname);
goto err;
}
/*
* XOF digests are not allowed except for RSA PSS.
* We don't support XOF digests with RSA PSS (yet), so just fail.
* When we do support them, uncomment the second clause.
*/
if ((EVP_MD_get_flags(md) & EVP_MD_FLAG_XOF) != 0
/* && ctx->pad_mode != RSA_PKCS1_PSS_PADDING */) {
ERR_raise(ERR_LIB_PROV, PROV_R_XOF_DIGESTS_NOT_ALLOWED);
goto err;
}
#ifdef FIPS_MODULE
{
int sha1_allowed = (ctx->operation != EVP_PKEY_OP_SIGN);
if (!ossl_fips_ind_digest_sign_check(OSSL_FIPS_IND_GET(ctx),
OSSL_FIPS_IND_SETTABLE1,
ctx->libctx,
md_nid, sha1_allowed, desc,
&FIPS_fips_signature_digest_check))
goto err;
}
#endif
if (!rsa_check_padding(ctx, mdname, NULL, md_nid))
goto err;
if (mdname_len >= sizeof(ctx->mdname)) {
ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,
"%s exceeds name buffer length", mdname);
goto err;
}
if (!ctx->flag_allow_md) {
if (ctx->mdname[0] != '\0' && !EVP_MD_is_a(md, ctx->mdname)) {
ERR_raise_data(ERR_LIB_PROV, PROV_R_DIGEST_NOT_ALLOWED,
"digest %s != %s", mdname, ctx->mdname);
goto err;
}
EVP_MD_free(md);
return 1;
}
if (!ctx->mgf1_md_set) {
if (!EVP_MD_up_ref(md)) {
goto err;
}
EVP_MD_free(ctx->mgf1_md);
ctx->mgf1_md = md;
ctx->mgf1_mdnid = md_nid;
OPENSSL_strlcpy(ctx->mgf1_mdname, mdname, sizeof(ctx->mgf1_mdname));
}
EVP_MD_CTX_free(ctx->mdctx);
EVP_MD_free(ctx->md);
ctx->mdctx = NULL;
ctx->md = md;
ctx->mdnid = md_nid;
OPENSSL_strlcpy(ctx->mdname, mdname, sizeof(ctx->mdname));
}
return 1;
err:
EVP_MD_free(md);
return 0;
}
static int rsa_setup_mgf1_md(PROV_RSA_CTX *ctx, const char *mdname,
const char *mdprops)
{
size_t len;
EVP_MD *md = NULL;
int mdnid;
if (mdprops == NULL)
mdprops = ctx->propq;
if ((md = EVP_MD_fetch(ctx->libctx, mdname, mdprops)) == NULL) {
ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,
"%s could not be fetched", mdname);
return 0;
}
/* The default for mgf1 is SHA1 - so allow SHA1 */
if ((mdnid = ossl_digest_rsa_sign_get_md_nid(md)) <= 0
|| !rsa_check_padding(ctx, NULL, mdname, mdnid)) {
if (mdnid <= 0)
ERR_raise_data(ERR_LIB_PROV, PROV_R_DIGEST_NOT_ALLOWED,
"digest=%s", mdname);
EVP_MD_free(md);
return 0;
}
len = OPENSSL_strlcpy(ctx->mgf1_mdname, mdname, sizeof(ctx->mgf1_mdname));
if (len >= sizeof(ctx->mgf1_mdname)) {
ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,
"%s exceeds name buffer length", mdname);
EVP_MD_free(md);
return 0;
}
EVP_MD_free(ctx->mgf1_md);
ctx->mgf1_md = md;
ctx->mgf1_mdnid = mdnid;
ctx->mgf1_md_set = 1;
return 1;
}
static int rsa_signverify_init(void *vprsactx, void *vrsa,
const OSSL_PARAM params[], int operation,
const char *desc)
{
PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
int protect;
if (!ossl_prov_is_running() || prsactx == NULL)
return 0;
if (vrsa == NULL && prsactx->rsa == NULL) {
ERR_raise(ERR_LIB_PROV, PROV_R_NO_KEY_SET);
return 0;
}
if (vrsa != NULL) {
if (!RSA_up_ref(vrsa))
return 0;
RSA_free(prsactx->rsa);
prsactx->rsa = vrsa;
}
if (!ossl_rsa_key_op_get_protect(prsactx->rsa, operation, &protect))
return 0;
prsactx->operation = operation;
/* Maximize up to digest length for sign, auto for verify */
prsactx->saltlen = RSA_PSS_SALTLEN_AUTO_DIGEST_MAX;
prsactx->min_saltlen = -1;
switch (RSA_test_flags(prsactx->rsa, RSA_FLAG_TYPE_MASK)) {
case RSA_FLAG_TYPE_RSA:
prsactx->pad_mode = RSA_PKCS1_PADDING;
break;
case RSA_FLAG_TYPE_RSASSAPSS:
prsactx->pad_mode = RSA_PKCS1_PSS_PADDING;
{
const RSA_PSS_PARAMS_30 *pss =
ossl_rsa_get0_pss_params_30(prsactx->rsa);
if (!ossl_rsa_pss_params_30_is_unrestricted(pss)) {
int md_nid = ossl_rsa_pss_params_30_hashalg(pss);
int mgf1md_nid = ossl_rsa_pss_params_30_maskgenhashalg(pss);
int min_saltlen = ossl_rsa_pss_params_30_saltlen(pss);
const char *mdname, *mgf1mdname;
size_t len;
mdname = ossl_rsa_oaeppss_nid2name(md_nid);
mgf1mdname = ossl_rsa_oaeppss_nid2name(mgf1md_nid);
if (mdname == NULL) {
ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,
"PSS restrictions lack hash algorithm");
return 0;
}
if (mgf1mdname == NULL) {
ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,
"PSS restrictions lack MGF1 hash algorithm");
return 0;
}
len = OPENSSL_strlcpy(prsactx->mdname, mdname,
sizeof(prsactx->mdname));
if (len >= sizeof(prsactx->mdname)) {
ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,
"hash algorithm name too long");
return 0;
}
len = OPENSSL_strlcpy(prsactx->mgf1_mdname, mgf1mdname,
sizeof(prsactx->mgf1_mdname));
if (len >= sizeof(prsactx->mgf1_mdname)) {
ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,
"MGF1 hash algorithm name too long");
return 0;
}
prsactx->saltlen = min_saltlen;
/* call rsa_setup_mgf1_md before rsa_setup_md to avoid duplication */
if (!rsa_setup_mgf1_md(prsactx, mgf1mdname, prsactx->propq)
|| !rsa_setup_md(prsactx, mdname, prsactx->propq, desc)
|| !rsa_check_parameters(prsactx, min_saltlen))
return 0;
}
}
break;
default:
ERR_raise(ERR_LIB_RSA, PROV_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
return 0;
}
OSSL_FIPS_IND_SET_APPROVED(prsactx)
if (!rsa_set_ctx_params(prsactx, params))
return 0;
#ifdef FIPS_MODULE
if (!ossl_fips_ind_rsa_key_check(OSSL_FIPS_IND_GET(prsactx),
OSSL_FIPS_IND_SETTABLE0, prsactx->libctx,
prsactx->rsa, desc, protect))
return 0;
#endif
return 1;
}
static int setup_tbuf(PROV_RSA_CTX *ctx)
{
if (ctx->tbuf != NULL)
return 1;
if ((ctx->tbuf = OPENSSL_malloc(RSA_size(ctx->rsa))) == NULL)
return 0;
return 1;
}
static void clean_tbuf(PROV_RSA_CTX *ctx)
{
if (ctx->tbuf != NULL)
OPENSSL_cleanse(ctx->tbuf, RSA_size(ctx->rsa));
}
static void free_tbuf(PROV_RSA_CTX *ctx)
{
clean_tbuf(ctx);
OPENSSL_free(ctx->tbuf);
ctx->tbuf = NULL;
}
#ifdef FIPS_MODULE
static int rsa_pss_saltlen_check_passed(PROV_RSA_CTX *ctx, const char *algoname, int saltlen)
{
int mdsize = rsa_get_md_size(ctx);
/*
* Perform the check if the salt length is compliant to FIPS 186-5.
*
* According to FIPS 186-5 5.4 (g), the salt length shall be between zero
* and the output block length of the digest function (inclusive).
*/
int approved = (saltlen >= 0 && saltlen <= mdsize);
if (!approved) {
if (!OSSL_FIPS_IND_ON_UNAPPROVED(ctx, OSSL_FIPS_IND_SETTABLE3,
ctx->libctx,
algoname, "PSS Salt Length",
FIPS_rsa_pss_saltlen_check)) {
ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_SALT_LENGTH);
return 0;
}
}
return 1;
}
#endif
static int rsa_sign_init(void *vprsactx, void *vrsa, const OSSL_PARAM params[])
{
if (!ossl_prov_is_running())
return 0;
return rsa_signverify_init(vprsactx, vrsa, params, EVP_PKEY_OP_SIGN,
"RSA Sign Init");
}
static int rsa_sign(void *vprsactx, unsigned char *sig, size_t *siglen,
size_t sigsize, const unsigned char *tbs, size_t tbslen)
{
PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
int ret;
size_t rsasize = RSA_size(prsactx->rsa);
size_t mdsize = rsa_get_md_size(prsactx);
if (!ossl_prov_is_running())
return 0;
if (sig == NULL) {
*siglen = rsasize;
return 1;
}
if (sigsize < rsasize) {
ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_SIGNATURE_SIZE,
"is %zu, should be at least %zu", sigsize, rsasize);
return 0;
}
if (mdsize != 0) {
if (tbslen != mdsize) {
ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_DIGEST_LENGTH);
return 0;
}
#ifndef FIPS_MODULE
if (EVP_MD_is_a(prsactx->md, OSSL_DIGEST_NAME_MDC2)) {
unsigned int sltmp;
if (prsactx->pad_mode != RSA_PKCS1_PADDING) {
ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_PADDING_MODE,
"only PKCS#1 padding supported with MDC2");
return 0;
}
ret = RSA_sign_ASN1_OCTET_STRING(0, tbs, tbslen, sig, &sltmp,
prsactx->rsa);
if (ret <= 0) {
ERR_raise(ERR_LIB_PROV, ERR_R_RSA_LIB);
return 0;
}
ret = sltmp;
goto end;
}
#endif
switch (prsactx->pad_mode) {
case RSA_X931_PADDING:
if ((size_t)RSA_size(prsactx->rsa) < tbslen + 1) {
ERR_raise_data(ERR_LIB_PROV, PROV_R_KEY_SIZE_TOO_SMALL,
"RSA key size = %d, expected minimum = %d",
RSA_size(prsactx->rsa), tbslen + 1);
return 0;
}
if (!setup_tbuf(prsactx)) {
ERR_raise(ERR_LIB_PROV, ERR_R_PROV_LIB);
return 0;
}
memcpy(prsactx->tbuf, tbs, tbslen);
prsactx->tbuf[tbslen] = RSA_X931_hash_id(prsactx->mdnid);
ret = RSA_private_encrypt(tbslen + 1, prsactx->tbuf,
sig, prsactx->rsa, RSA_X931_PADDING);
clean_tbuf(prsactx);
break;
case RSA_PKCS1_PADDING:
{
unsigned int sltmp;
ret = RSA_sign(prsactx->mdnid, tbs, tbslen, sig, &sltmp,
prsactx->rsa);
if (ret <= 0) {
ERR_raise(ERR_LIB_PROV, ERR_R_RSA_LIB);
return 0;
}
ret = sltmp;
}
break;
case RSA_PKCS1_PSS_PADDING:
{
int saltlen;
/* Check PSS restrictions */
if (rsa_pss_restricted(prsactx)) {
switch (prsactx->saltlen) {
case RSA_PSS_SALTLEN_DIGEST:
if (prsactx->min_saltlen > EVP_MD_get_size(prsactx->md)) {
ERR_raise_data(ERR_LIB_PROV,
PROV_R_PSS_SALTLEN_TOO_SMALL,
"minimum salt length set to %d, "
"but the digest only gives %d",
prsactx->min_saltlen,
EVP_MD_get_size(prsactx->md));
return 0;
}
/* FALLTHRU */
default:
if (prsactx->saltlen >= 0
&& prsactx->saltlen < prsactx->min_saltlen) {
ERR_raise_data(ERR_LIB_PROV,
PROV_R_PSS_SALTLEN_TOO_SMALL,
"minimum salt length set to %d, but the"
"actual salt length is only set to %d",
prsactx->min_saltlen,
prsactx->saltlen);
return 0;
}
break;
}
}
if (!setup_tbuf(prsactx))
return 0;
saltlen = prsactx->saltlen;
if (!ossl_rsa_padding_add_PKCS1_PSS_mgf1(prsactx->rsa,
prsactx->tbuf, tbs,
prsactx->md, prsactx->mgf1_md,
&saltlen)) {
ERR_raise(ERR_LIB_PROV, ERR_R_RSA_LIB);
return 0;
}
#ifdef FIPS_MODULE
if (!rsa_pss_saltlen_check_passed(prsactx, "RSA Sign", saltlen))
return 0;
#endif
ret = RSA_private_encrypt(RSA_size(prsactx->rsa), prsactx->tbuf,
sig, prsactx->rsa, RSA_NO_PADDING);
clean_tbuf(prsactx);
}
break;
default:
ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_PADDING_MODE,
"Only X.931, PKCS#1 v1.5 or PSS padding allowed");
return 0;
}
} else {
ret = RSA_private_encrypt(tbslen, tbs, sig, prsactx->rsa,
prsactx->pad_mode);
}
#ifndef FIPS_MODULE
end:
#endif
if (ret <= 0) {
ERR_raise(ERR_LIB_PROV, ERR_R_RSA_LIB);
return 0;
}
*siglen = ret;
return 1;
}
static int rsa_verify_recover_init(void *vprsactx, void *vrsa,
const OSSL_PARAM params[])
{
if (!ossl_prov_is_running())
return 0;
return rsa_signverify_init(vprsactx, vrsa, params,
EVP_PKEY_OP_VERIFYRECOVER, "RSA VerifyRecover Init");
}
static int rsa_verify_recover(void *vprsactx,
unsigned char *rout,
size_t *routlen,
size_t routsize,
const unsigned char *sig,
size_t siglen)
{
PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
int ret;
if (!ossl_prov_is_running())
return 0;
if (rout == NULL) {
*routlen = RSA_size(prsactx->rsa);
return 1;
}
if (prsactx->md != NULL) {
switch (prsactx->pad_mode) {
case RSA_X931_PADDING:
if (!setup_tbuf(prsactx))
return 0;
ret = RSA_public_decrypt(siglen, sig, prsactx->tbuf, prsactx->rsa,
RSA_X931_PADDING);
if (ret < 1) {
ERR_raise(ERR_LIB_PROV, ERR_R_RSA_LIB);
return 0;
}
ret--;
if (prsactx->tbuf[ret] != RSA_X931_hash_id(prsactx->mdnid)) {
ERR_raise(ERR_LIB_PROV, PROV_R_ALGORITHM_MISMATCH);
return 0;
}
if (ret != EVP_MD_get_size(prsactx->md)) {
ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST_LENGTH,
"Should be %d, but got %d",
EVP_MD_get_size(prsactx->md), ret);
return 0;
}
*routlen = ret;
if (rout != prsactx->tbuf) {
if (routsize < (size_t)ret) {
ERR_raise_data(ERR_LIB_PROV, PROV_R_OUTPUT_BUFFER_TOO_SMALL,
"buffer size is %d, should be %d",
routsize, ret);
return 0;
}
memcpy(rout, prsactx->tbuf, ret);
}
break;
case RSA_PKCS1_PADDING:
{
size_t sltmp;
ret = ossl_rsa_verify(prsactx->mdnid, NULL, 0, rout, &sltmp,
sig, siglen, prsactx->rsa);
if (ret <= 0) {
ERR_raise(ERR_LIB_PROV, ERR_R_RSA_LIB);
return 0;
}
ret = sltmp;
}
break;
default:
ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_PADDING_MODE,
"Only X.931 or PKCS#1 v1.5 padding allowed");
return 0;
}
} else {
ret = RSA_public_decrypt(siglen, sig, rout, prsactx->rsa,
prsactx->pad_mode);
if (ret < 0) {
ERR_raise(ERR_LIB_PROV, ERR_R_RSA_LIB);
return 0;
}
}
*routlen = ret;
return 1;
}
static int rsa_verify_init(void *vprsactx, void *vrsa,
const OSSL_PARAM params[])
{
if (!ossl_prov_is_running())
return 0;
return rsa_signverify_init(vprsactx, vrsa, params, EVP_PKEY_OP_VERIFY,
"RSA Verify Init");
}
static int rsa_verify(void *vprsactx, const unsigned char *sig, size_t siglen,
const unsigned char *tbs, size_t tbslen)
{
PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
size_t rslen;
if (!ossl_prov_is_running())
return 0;
if (prsactx->md != NULL) {
switch (prsactx->pad_mode) {
case RSA_PKCS1_PADDING:
if (!RSA_verify(prsactx->mdnid, tbs, tbslen, sig, siglen,
prsactx->rsa)) {
ERR_raise(ERR_LIB_PROV, ERR_R_RSA_LIB);
return 0;
}
return 1;
case RSA_X931_PADDING:
if (!setup_tbuf(prsactx))
return 0;
if (rsa_verify_recover(prsactx, prsactx->tbuf, &rslen, 0,
sig, siglen) <= 0)
return 0;
break;
case RSA_PKCS1_PSS_PADDING:
{
int ret;
int saltlen;
size_t mdsize;
/*
* We need to check this for the RSA_verify_PKCS1_PSS_mgf1()
* call
*/
mdsize = rsa_get_md_size(prsactx);
if (tbslen != mdsize) {
ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST_LENGTH,
"Should be %d, but got %d",
mdsize, tbslen);
return 0;
}
if (!setup_tbuf(prsactx))
return 0;
ret = RSA_public_decrypt(siglen, sig, prsactx->tbuf,
prsactx->rsa, RSA_NO_PADDING);
if (ret <= 0) {
ERR_raise(ERR_LIB_PROV, ERR_R_RSA_LIB);
return 0;
}
saltlen = prsactx->saltlen;
ret = ossl_rsa_verify_PKCS1_PSS_mgf1(prsactx->rsa, tbs,
prsactx->md, prsactx->mgf1_md,
prsactx->tbuf,
&saltlen);
if (ret <= 0) {
ERR_raise(ERR_LIB_PROV, ERR_R_RSA_LIB);
return 0;
}
#ifdef FIPS_MODULE
if (!rsa_pss_saltlen_check_passed(prsactx, "RSA Verify", saltlen))
return 0;
#endif
return 1;
}
default:
ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_PADDING_MODE,
"Only X.931, PKCS#1 v1.5 or PSS padding allowed");
return 0;
}
} else {
int ret;
if (!setup_tbuf(prsactx))
return 0;
ret = RSA_public_decrypt(siglen, sig, prsactx->tbuf, prsactx->rsa,
prsactx->pad_mode);
if (ret <= 0) {
ERR_raise(ERR_LIB_PROV, ERR_R_RSA_LIB);
return 0;
}
rslen = (size_t)ret;
}
if ((rslen != tbslen) || memcmp(tbs, prsactx->tbuf, rslen))
return 0;
return 1;
}
static int rsa_digest_signverify_init(void *vprsactx, const char *mdname,
void *vrsa, const OSSL_PARAM params[],
int operation, const char *desc)
{
PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
if (!ossl_prov_is_running())
return 0;
if (!rsa_signverify_init(vprsactx, vrsa, params, operation, desc))
return 0;
if (mdname != NULL
/* was rsa_setup_md already called in rsa_signverify_init()? */
&& (mdname[0] == '\0' || OPENSSL_strcasecmp(prsactx->mdname, mdname) != 0)
&& !rsa_setup_md(prsactx, mdname, prsactx->propq, desc))
return 0;
prsactx->flag_allow_md = 0;
if (prsactx->mdctx == NULL) {
prsactx->mdctx = EVP_MD_CTX_new();
if (prsactx->mdctx == NULL)
goto error;
}
if (!EVP_DigestInit_ex2(prsactx->mdctx, prsactx->md, params))
goto error;
return 1;
error:
EVP_MD_CTX_free(prsactx->mdctx);
prsactx->mdctx = NULL;
return 0;
}
static int rsa_digest_signverify_update(void *vprsactx,
const unsigned char *data,
size_t datalen)
{
PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
if (prsactx == NULL || prsactx->mdctx == NULL)
return 0;
return EVP_DigestUpdate(prsactx->mdctx, data, datalen);
}
static int rsa_digest_sign_init(void *vprsactx, const char *mdname,
void *vrsa, const OSSL_PARAM params[])
{
if (!ossl_prov_is_running())
return 0;
return rsa_digest_signverify_init(vprsactx, mdname, vrsa,
params, EVP_PKEY_OP_SIGN,
"RSA Digest Sign Init");
}
static int rsa_digest_sign_final(void *vprsactx, unsigned char *sig,
size_t *siglen, size_t sigsize)
{
PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
unsigned char digest[EVP_MAX_MD_SIZE];
unsigned int dlen = 0;
if (!ossl_prov_is_running() || prsactx == NULL)
return 0;
prsactx->flag_allow_md = 1;
if (prsactx->mdctx == NULL)
return 0;
/*
* If sig is NULL then we're just finding out the sig size. Other fields
* are ignored. Defer to rsa_sign.
*/
if (sig != NULL) {
/*
* The digests used here are all known (see rsa_get_md_nid()), so they
* should not exceed the internal buffer size of EVP_MAX_MD_SIZE.
*/
if (!EVP_DigestFinal_ex(prsactx->mdctx, digest, &dlen))
return 0;
}
return rsa_sign(vprsactx, sig, siglen, sigsize, digest, (size_t)dlen);
}
static int rsa_digest_verify_init(void *vprsactx, const char *mdname,
void *vrsa, const OSSL_PARAM params[])
{
if (!ossl_prov_is_running())
return 0;
return rsa_digest_signverify_init(vprsactx, mdname, vrsa,
params, EVP_PKEY_OP_VERIFY,
"RSA Digest Verify Init");
}
int rsa_digest_verify_final(void *vprsactx, const unsigned char *sig,
size_t siglen)
{
PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
unsigned char digest[EVP_MAX_MD_SIZE];
unsigned int dlen = 0;
if (!ossl_prov_is_running())
return 0;
if (prsactx == NULL)
return 0;
prsactx->flag_allow_md = 1;
if (prsactx->mdctx == NULL)
return 0;
/*
* The digests used here are all known (see rsa_get_md_nid()), so they
* should not exceed the internal buffer size of EVP_MAX_MD_SIZE.
*/
if (!EVP_DigestFinal_ex(prsactx->mdctx, digest, &dlen))
return 0;
return rsa_verify(vprsactx, sig, siglen, digest, (size_t)dlen);
}
static void rsa_freectx(void *vprsactx)
{
PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
if (prsactx == NULL)
return;
EVP_MD_CTX_free(prsactx->mdctx);
EVP_MD_free(prsactx->md);
EVP_MD_free(prsactx->mgf1_md);
OPENSSL_free(prsactx->propq);
free_tbuf(prsactx);
RSA_free(prsactx->rsa);
OPENSSL_clear_free(prsactx, sizeof(*prsactx));
}
static void *rsa_dupctx(void *vprsactx)
{
PROV_RSA_CTX *srcctx = (PROV_RSA_CTX *)vprsactx;
PROV_RSA_CTX *dstctx;
if (!ossl_prov_is_running())
return NULL;
dstctx = OPENSSL_zalloc(sizeof(*srcctx));
if (dstctx == NULL)
return NULL;
*dstctx = *srcctx;
dstctx->rsa = NULL;
dstctx->md = NULL;
dstctx->mgf1_md = NULL;
dstctx->mdctx = NULL;
dstctx->tbuf = NULL;
dstctx->propq = NULL;
if (srcctx->rsa != NULL && !RSA_up_ref(srcctx->rsa))
goto err;
dstctx->rsa = srcctx->rsa;
if (srcctx->md != NULL && !EVP_MD_up_ref(srcctx->md))
goto err;
dstctx->md = srcctx->md;
if (srcctx->mgf1_md != NULL && !EVP_MD_up_ref(srcctx->mgf1_md))
goto err;
dstctx->mgf1_md = srcctx->mgf1_md;
if (srcctx->mdctx != NULL) {
dstctx->mdctx = EVP_MD_CTX_new();
if (dstctx->mdctx == NULL
|| !EVP_MD_CTX_copy_ex(dstctx->mdctx, srcctx->mdctx))
goto err;
}
if (srcctx->propq != NULL) {
dstctx->propq = OPENSSL_strdup(srcctx->propq);
if (dstctx->propq == NULL)
goto err;
}
return dstctx;
err:
rsa_freectx(dstctx);
return NULL;
}
static int rsa_get_ctx_params(void *vprsactx, OSSL_PARAM *params)
{
PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
OSSL_PARAM *p;
if (prsactx == NULL)
return 0;
p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_ALGORITHM_ID);
if (p != NULL) {
/* The Algorithm Identifier of the combined signature algorithm */
unsigned char aid_buf[128];
unsigned char *aid;
size_t aid_len;
aid = rsa_generate_signature_aid(prsactx, aid_buf,
sizeof(aid_buf), &aid_len);
if (aid == NULL || !OSSL_PARAM_set_octet_string(p, aid, aid_len))
return 0;
}
p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_PAD_MODE);
if (p != NULL)
switch (p->data_type) {
case OSSL_PARAM_INTEGER:
if (!OSSL_PARAM_set_int(p, prsactx->pad_mode))
return 0;
break;
case OSSL_PARAM_UTF8_STRING:
{
int i;
const char *word = NULL;
for (i = 0; padding_item[i].id != 0; i++) {
if (prsactx->pad_mode == (int)padding_item[i].id) {
word = padding_item[i].ptr;
break;
}
}
if (word != NULL) {
if (!OSSL_PARAM_set_utf8_string(p, word))
return 0;
} else {
ERR_raise(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR);
}
}
break;
default:
return 0;
}
p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_DIGEST);
if (p != NULL && !OSSL_PARAM_set_utf8_string(p, prsactx->mdname))
return 0;
p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_MGF1_DIGEST);
if (p != NULL && !OSSL_PARAM_set_utf8_string(p, prsactx->mgf1_mdname))
return 0;
p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_PSS_SALTLEN);
if (p != NULL) {
if (p->data_type == OSSL_PARAM_INTEGER) {
if (!OSSL_PARAM_set_int(p, prsactx->saltlen))
return 0;
} else if (p->data_type == OSSL_PARAM_UTF8_STRING) {
const char *value = NULL;
switch (prsactx->saltlen) {
case RSA_PSS_SALTLEN_DIGEST:
value = OSSL_PKEY_RSA_PSS_SALT_LEN_DIGEST;
break;
case RSA_PSS_SALTLEN_MAX:
value = OSSL_PKEY_RSA_PSS_SALT_LEN_MAX;
break;
case RSA_PSS_SALTLEN_AUTO:
value = OSSL_PKEY_RSA_PSS_SALT_LEN_AUTO;
break;
case RSA_PSS_SALTLEN_AUTO_DIGEST_MAX:
value = OSSL_PKEY_RSA_PSS_SALT_LEN_AUTO_DIGEST_MAX;
break;
default:
{
int len = BIO_snprintf(p->data, p->data_size, "%d",
prsactx->saltlen);
if (len <= 0)
return 0;
p->return_size = len;
break;
}
}
if (value != NULL
&& !OSSL_PARAM_set_utf8_string(p, value))
return 0;
}
}
if (!OSSL_FIPS_IND_GET_CTX_PARAM(prsactx, params))
return 0;
return 1;
}
static const OSSL_PARAM known_gettable_ctx_params[] = {
OSSL_PARAM_octet_string(OSSL_SIGNATURE_PARAM_ALGORITHM_ID, NULL, 0),
OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_PAD_MODE, NULL, 0),
OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_DIGEST, NULL, 0),
OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_MGF1_DIGEST, NULL, 0),
OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_PSS_SALTLEN, NULL, 0),
OSSL_FIPS_IND_GETTABLE_CTX_PARAM()
OSSL_PARAM_END
};
static const OSSL_PARAM *rsa_gettable_ctx_params(ossl_unused void *vprsactx,
ossl_unused void *provctx)
{
return known_gettable_ctx_params;
}
#ifdef FIPS_MODULE
static int rsa_x931_padding_allowed(PROV_RSA_CTX *ctx)
{
int approved = ((ctx->operation & EVP_PKEY_OP_SIGN) == 0);
if (!approved) {
if (!OSSL_FIPS_IND_ON_UNAPPROVED(ctx, OSSL_FIPS_IND_SETTABLE2,
ctx->libctx,
"RSA Sign set ctx", "X931 Padding",
FIPS_rsa_sign_x931_disallowed)) {
ERR_raise(ERR_LIB_PROV,
PROV_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE);
return 0;
}
}
return 1;
}
#endif
static int rsa_set_ctx_params(void *vprsactx, const OSSL_PARAM params[])
{
PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
const OSSL_PARAM *p;
int pad_mode;
int saltlen;
char mdname[OSSL_MAX_NAME_SIZE] = "", *pmdname = NULL;
char mdprops[OSSL_MAX_PROPQUERY_SIZE] = "", *pmdprops = NULL;
char mgf1mdname[OSSL_MAX_NAME_SIZE] = "", *pmgf1mdname = NULL;
char mgf1mdprops[OSSL_MAX_PROPQUERY_SIZE] = "", *pmgf1mdprops = NULL;
if (prsactx == NULL)
return 0;
if (params == NULL)
return 1;
if (!OSSL_FIPS_IND_SET_CTX_PARAM(prsactx, OSSL_FIPS_IND_SETTABLE0, params,
OSSL_SIGNATURE_PARAM_FIPS_KEY_CHECK))
return 0;
if (!OSSL_FIPS_IND_SET_CTX_PARAM(prsactx, OSSL_FIPS_IND_SETTABLE1, params,
OSSL_SIGNATURE_PARAM_FIPS_DIGEST_CHECK))
return 0;
if (!OSSL_FIPS_IND_SET_CTX_PARAM(prsactx, OSSL_FIPS_IND_SETTABLE2, params,
OSSL_SIGNATURE_PARAM_FIPS_SIGN_X931_PAD_CHECK))
return 0;
if (!OSSL_FIPS_IND_SET_CTX_PARAM(prsactx, OSSL_FIPS_IND_SETTABLE3, params,
OSSL_SIGNATURE_PARAM_FIPS_RSA_PSS_SALTLEN_CHECK))
return 0;
pad_mode = prsactx->pad_mode;
saltlen = prsactx->saltlen;
p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_DIGEST);
if (p != NULL) {
const OSSL_PARAM *propsp =
OSSL_PARAM_locate_const(params,
OSSL_SIGNATURE_PARAM_PROPERTIES);
pmdname = mdname;
if (!OSSL_PARAM_get_utf8_string(p, &pmdname, sizeof(mdname)))
return 0;
if (propsp != NULL) {
pmdprops = mdprops;
if (!OSSL_PARAM_get_utf8_string(propsp,
&pmdprops, sizeof(mdprops)))
return 0;
}
}
p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_PAD_MODE);
if (p != NULL) {
const char *err_extra_text = NULL;
switch (p->data_type) {
case OSSL_PARAM_INTEGER: /* Support for legacy pad mode number */
if (!OSSL_PARAM_get_int(p, &pad_mode))
return 0;
break;
case OSSL_PARAM_UTF8_STRING:
{
int i;
if (p->data == NULL)
return 0;
for (i = 0; padding_item[i].id != 0; i++) {
if (strcmp(p->data, padding_item[i].ptr) == 0) {
pad_mode = padding_item[i].id;
break;
}
}
}
break;
default:
return 0;
}
switch (pad_mode) {
case RSA_PKCS1_OAEP_PADDING:
/*
* OAEP padding is for asymmetric cipher only so is not compatible
* with signature use.
*/
err_extra_text = "OAEP padding not allowed for signing / verifying";
goto bad_pad;
case RSA_PKCS1_PSS_PADDING:
if ((prsactx->operation
& (EVP_PKEY_OP_SIGN | EVP_PKEY_OP_VERIFY)) == 0) {
err_extra_text =
"PSS padding only allowed for sign and verify operations";
goto bad_pad;
}
break;
case RSA_PKCS1_PADDING:
err_extra_text = "PKCS#1 padding not allowed with RSA-PSS";
goto cont;
case RSA_NO_PADDING:
err_extra_text = "No padding not allowed with RSA-PSS";
goto cont;
case RSA_X931_PADDING:
#ifdef FIPS_MODULE
/* X9.31 only allows sizes of 1024 + 256 * s (bits) */
if ((RSA_bits(prsactx->rsa) & 0xFF) != 0) {
ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);
return 0;
}
/* RSA Signing with X9.31 padding is not allowed in FIPS 140-3 */
if (!rsa_x931_padding_allowed(prsactx))
return 0;
#endif
err_extra_text = "X.931 padding not allowed with RSA-PSS";
cont:
if (RSA_test_flags(prsactx->rsa,
RSA_FLAG_TYPE_MASK) == RSA_FLAG_TYPE_RSA)
break;
/* FALLTHRU */
default:
bad_pad:
if (err_extra_text == NULL)
ERR_raise(ERR_LIB_PROV,
PROV_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE);
else
ERR_raise_data(ERR_LIB_PROV,
PROV_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE,
err_extra_text);
return 0;
}
}
p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_PSS_SALTLEN);
if (p != NULL) {
if (pad_mode != RSA_PKCS1_PSS_PADDING) {
ERR_raise_data(ERR_LIB_PROV, PROV_R_NOT_SUPPORTED,
"PSS saltlen can only be specified if "
"PSS padding has been specified first");
return 0;
}
switch (p->data_type) {
case OSSL_PARAM_INTEGER: /* Support for legacy pad mode number */
if (!OSSL_PARAM_get_int(p, &saltlen))
return 0;
break;
case OSSL_PARAM_UTF8_STRING:
if (strcmp(p->data, OSSL_PKEY_RSA_PSS_SALT_LEN_DIGEST) == 0)
saltlen = RSA_PSS_SALTLEN_DIGEST;
else if (strcmp(p->data, OSSL_PKEY_RSA_PSS_SALT_LEN_MAX) == 0)
saltlen = RSA_PSS_SALTLEN_MAX;
else if (strcmp(p->data, OSSL_PKEY_RSA_PSS_SALT_LEN_AUTO) == 0)
saltlen = RSA_PSS_SALTLEN_AUTO;
else if (strcmp(p->data, OSSL_PKEY_RSA_PSS_SALT_LEN_AUTO_DIGEST_MAX) == 0)
saltlen = RSA_PSS_SALTLEN_AUTO_DIGEST_MAX;
else
saltlen = atoi(p->data);
break;
default:
return 0;
}
/*
* RSA_PSS_SALTLEN_AUTO_DIGEST_MAX seems curiously named in this check.
* Contrary to what it's name suggests, it's the currently lowest
* saltlen number possible.
*/
if (saltlen < RSA_PSS_SALTLEN_AUTO_DIGEST_MAX) {
ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_SALT_LENGTH);
return 0;
}
if (rsa_pss_restricted(prsactx)) {
switch (saltlen) {
case RSA_PSS_SALTLEN_AUTO:
case RSA_PSS_SALTLEN_AUTO_DIGEST_MAX:
if (prsactx->operation == EVP_PKEY_OP_VERIFY) {
ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_SALT_LENGTH,
"Cannot use autodetected salt length");
return 0;
}
break;
case RSA_PSS_SALTLEN_DIGEST:
if (prsactx->min_saltlen > EVP_MD_get_size(prsactx->md)) {
ERR_raise_data(ERR_LIB_PROV,
PROV_R_PSS_SALTLEN_TOO_SMALL,
"Should be more than %d, but would be "
"set to match digest size (%d)",
prsactx->min_saltlen,
EVP_MD_get_size(prsactx->md));
return 0;
}
break;
default:
if (saltlen >= 0 && saltlen < prsactx->min_saltlen) {
ERR_raise_data(ERR_LIB_PROV,
PROV_R_PSS_SALTLEN_TOO_SMALL,
"Should be more than %d, "
"but would be set to %d",
prsactx->min_saltlen, saltlen);
return 0;
}
}
}
}
p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_MGF1_DIGEST);
if (p != NULL) {
const OSSL_PARAM *propsp =
OSSL_PARAM_locate_const(params,
OSSL_SIGNATURE_PARAM_MGF1_PROPERTIES);
pmgf1mdname = mgf1mdname;
if (!OSSL_PARAM_get_utf8_string(p, &pmgf1mdname, sizeof(mgf1mdname)))
return 0;
if (propsp != NULL) {
pmgf1mdprops = mgf1mdprops;
if (!OSSL_PARAM_get_utf8_string(propsp,
&pmgf1mdprops, sizeof(mgf1mdprops)))
return 0;
}
if (pad_mode != RSA_PKCS1_PSS_PADDING) {
ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_MGF1_MD);
return 0;
}
}
prsactx->saltlen = saltlen;
prsactx->pad_mode = pad_mode;
if (prsactx->md == NULL && pmdname == NULL
&& pad_mode == RSA_PKCS1_PSS_PADDING)
pmdname = RSA_DEFAULT_DIGEST_NAME;
if (pmgf1mdname != NULL
&& !rsa_setup_mgf1_md(prsactx, pmgf1mdname, pmgf1mdprops))
return 0;
if (pmdname != NULL) {
if (!rsa_setup_md(prsactx, pmdname, pmdprops, "RSA Sign Set Ctx"))
return 0;
} else {
if (!rsa_check_padding(prsactx, NULL, NULL, prsactx->mdnid))
return 0;
}
return 1;
}
static const OSSL_PARAM settable_ctx_params[] = {
OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_DIGEST, NULL, 0),
OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_PROPERTIES, NULL, 0),
OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_PAD_MODE, NULL, 0),
OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_MGF1_DIGEST, NULL, 0),
OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_MGF1_PROPERTIES, NULL, 0),
OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_PSS_SALTLEN, NULL, 0),
OSSL_FIPS_IND_SETTABLE_CTX_PARAM(OSSL_SIGNATURE_PARAM_FIPS_KEY_CHECK)
OSSL_FIPS_IND_SETTABLE_CTX_PARAM(OSSL_SIGNATURE_PARAM_FIPS_DIGEST_CHECK)
OSSL_FIPS_IND_SETTABLE_CTX_PARAM(OSSL_SIGNATURE_PARAM_FIPS_RSA_PSS_SALTLEN_CHECK)
OSSL_FIPS_IND_SETTABLE_CTX_PARAM(OSSL_SIGNATURE_PARAM_FIPS_SIGN_X931_PAD_CHECK)
OSSL_PARAM_END
};
static const OSSL_PARAM settable_ctx_params_no_digest[] = {
OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_PAD_MODE, NULL, 0),
OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_MGF1_DIGEST, NULL, 0),
OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_MGF1_PROPERTIES, NULL, 0),
OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_PSS_SALTLEN, NULL, 0),
OSSL_FIPS_IND_SETTABLE_CTX_PARAM(OSSL_SIGNATURE_PARAM_FIPS_KEY_CHECK)
OSSL_FIPS_IND_SETTABLE_CTX_PARAM(OSSL_SIGNATURE_PARAM_FIPS_DIGEST_CHECK)
OSSL_FIPS_IND_SETTABLE_CTX_PARAM(OSSL_SIGNATURE_PARAM_FIPS_RSA_PSS_SALTLEN_CHECK)
OSSL_FIPS_IND_SETTABLE_CTX_PARAM(OSSL_SIGNATURE_PARAM_FIPS_SIGN_X931_PAD_CHECK)
OSSL_PARAM_END
};
static const OSSL_PARAM *rsa_settable_ctx_params(void *vprsactx,
ossl_unused void *provctx)
{
PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
if (prsactx != NULL && !prsactx->flag_allow_md)
return settable_ctx_params_no_digest;
return settable_ctx_params;
}
static int rsa_get_ctx_md_params(void *vprsactx, OSSL_PARAM *params)
{
PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
if (prsactx->mdctx == NULL)
return 0;
return EVP_MD_CTX_get_params(prsactx->mdctx, params);
}
static const OSSL_PARAM *rsa_gettable_ctx_md_params(void *vprsactx)
{
PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
if (prsactx->md == NULL)
return 0;
return EVP_MD_gettable_ctx_params(prsactx->md);
}
static int rsa_set_ctx_md_params(void *vprsactx, const OSSL_PARAM params[])
{
PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
if (prsactx->mdctx == NULL)
return 0;
return EVP_MD_CTX_set_params(prsactx->mdctx, params);
}
static const OSSL_PARAM *rsa_settable_ctx_md_params(void *vprsactx)
{
PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
if (prsactx->md == NULL)
return 0;
return EVP_MD_settable_ctx_params(prsactx->md);
}
const OSSL_DISPATCH ossl_rsa_signature_functions[] = {
{ OSSL_FUNC_SIGNATURE_NEWCTX, (void (*)(void))rsa_newctx },
{ OSSL_FUNC_SIGNATURE_SIGN_INIT, (void (*)(void))rsa_sign_init },
{ OSSL_FUNC_SIGNATURE_SIGN, (void (*)(void))rsa_sign },
{ OSSL_FUNC_SIGNATURE_VERIFY_INIT, (void (*)(void))rsa_verify_init },
{ OSSL_FUNC_SIGNATURE_VERIFY, (void (*)(void))rsa_verify },
{ OSSL_FUNC_SIGNATURE_VERIFY_RECOVER_INIT,
(void (*)(void))rsa_verify_recover_init },
{ OSSL_FUNC_SIGNATURE_VERIFY_RECOVER,
(void (*)(void))rsa_verify_recover },
{ OSSL_FUNC_SIGNATURE_DIGEST_SIGN_INIT,
(void (*)(void))rsa_digest_sign_init },
{ OSSL_FUNC_SIGNATURE_DIGEST_SIGN_UPDATE,
(void (*)(void))rsa_digest_signverify_update },
{ OSSL_FUNC_SIGNATURE_DIGEST_SIGN_FINAL,
(void (*)(void))rsa_digest_sign_final },
{ OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_INIT,
(void (*)(void))rsa_digest_verify_init },
{ OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_UPDATE,
(void (*)(void))rsa_digest_signverify_update },
{ OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_FINAL,
(void (*)(void))rsa_digest_verify_final },
{ OSSL_FUNC_SIGNATURE_FREECTX, (void (*)(void))rsa_freectx },
{ OSSL_FUNC_SIGNATURE_DUPCTX, (void (*)(void))rsa_dupctx },
{ OSSL_FUNC_SIGNATURE_GET_CTX_PARAMS, (void (*)(void))rsa_get_ctx_params },
{ OSSL_FUNC_SIGNATURE_GETTABLE_CTX_PARAMS,
(void (*)(void))rsa_gettable_ctx_params },
{ OSSL_FUNC_SIGNATURE_SET_CTX_PARAMS, (void (*)(void))rsa_set_ctx_params },
{ OSSL_FUNC_SIGNATURE_SETTABLE_CTX_PARAMS,
(void (*)(void))rsa_settable_ctx_params },
{ OSSL_FUNC_SIGNATURE_GET_CTX_MD_PARAMS,
(void (*)(void))rsa_get_ctx_md_params },
{ OSSL_FUNC_SIGNATURE_GETTABLE_CTX_MD_PARAMS,
(void (*)(void))rsa_gettable_ctx_md_params },
{ OSSL_FUNC_SIGNATURE_SET_CTX_MD_PARAMS,
(void (*)(void))rsa_set_ctx_md_params },
{ OSSL_FUNC_SIGNATURE_SETTABLE_CTX_MD_PARAMS,
(void (*)(void))rsa_settable_ctx_md_params },
OSSL_DISPATCH_END
};
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