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src/lib/libcrypto/rsa/rsa_ameth.c

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/* $OpenBSD: rsa_ameth.c,v 1.56 2024/01/04 17:01:26 tb Exp $ */
/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
* project 2006.
*/
/* ====================================================================
* Copyright (c) 2006 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* licensing@OpenSSL.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com).
*
*/
#include <stdio.h>
#include <openssl/opensslconf.h>
#include <openssl/asn1t.h>
#include <openssl/bn.h>
#include <openssl/cms.h>
#include <openssl/err.h>
#include <openssl/rsa.h>
#include <openssl/x509.h>
#include "asn1_local.h"
#include "bn_local.h"
#include "cryptlib.h"
#include "evp_local.h"
#include "rsa_local.h"
#include "x509_local.h"
/* Macros to test if a pkey or ctx is for a PSS key */
#define pkey_is_pss(pkey) (pkey->ameth->pkey_id == EVP_PKEY_RSA_PSS)
#define pkey_ctx_is_pss(ctx) (ctx->pmeth->pkey_id == EVP_PKEY_RSA_PSS)
#ifndef OPENSSL_NO_CMS
static int rsa_cms_sign(CMS_SignerInfo *si);
static int rsa_cms_verify(CMS_SignerInfo *si);
static int rsa_cms_decrypt(CMS_RecipientInfo *ri);
static int rsa_cms_encrypt(CMS_RecipientInfo *ri);
#endif
static RSA_PSS_PARAMS *rsa_pss_decode(const X509_ALGOR *alg);
static int rsa_alg_set_pkcs1_padding(X509_ALGOR *alg);
/* Set any parameters associated with pkey */
static int
rsa_param_encode(const EVP_PKEY *pkey, ASN1_STRING **pstr, int *pstrtype)
{
const RSA *rsa = pkey->pkey.rsa;
*pstr = NULL;
/* If RSA it's just NULL type */
if (pkey->ameth->pkey_id != EVP_PKEY_RSA_PSS) {
*pstrtype = V_ASN1_NULL;
return 1;
}
/* If no PSS parameters we omit parameters entirely */
if (rsa->pss == NULL) {
*pstrtype = V_ASN1_UNDEF;
return 1;
}
/* Encode PSS parameters */
if (ASN1_item_pack(rsa->pss, &RSA_PSS_PARAMS_it, pstr) == NULL)
return 0;
*pstrtype = V_ASN1_SEQUENCE;
return 1;
}
/* Decode any parameters and set them in RSA structure */
static int
rsa_param_decode(RSA *rsa, const X509_ALGOR *alg)
{
const ASN1_OBJECT *algoid;
const void *algp;
int algptype;
X509_ALGOR_get0(&algoid, &algptype, &algp, alg);
if (OBJ_obj2nid(algoid) != EVP_PKEY_RSA_PSS)
return 1;
if (algptype == V_ASN1_UNDEF)
return 1;
if (algptype != V_ASN1_SEQUENCE) {
RSAerror(RSA_R_INVALID_PSS_PARAMETERS);
return 0;
}
rsa->pss = rsa_pss_decode(alg);
if (rsa->pss == NULL)
return 0;
return 1;
}
static int
rsa_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
{
ASN1_STRING *str = NULL;
int strtype;
unsigned char *penc = NULL;
int penclen = 0;
ASN1_OBJECT *aobj;
if (!rsa_param_encode(pkey, &str, &strtype))
goto err;
if ((penclen = i2d_RSAPublicKey(pkey->pkey.rsa, &penc)) <= 0) {
penclen = 0;
goto err;
}
if ((aobj = OBJ_nid2obj(pkey->ameth->pkey_id)) == NULL)
goto err;
if (!X509_PUBKEY_set0_param(pk, aobj, strtype, str, penc, penclen))
goto err;
return 1;
err:
ASN1_STRING_free(str);
freezero(penc, penclen);
return 0;
}
static int
rsa_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey)
{
const unsigned char *p;
int pklen;
X509_ALGOR *alg;
RSA *rsa = NULL;
if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &alg, pubkey))
return 0;
if ((rsa = d2i_RSAPublicKey(NULL, &p, pklen)) == NULL) {
RSAerror(ERR_R_RSA_LIB);
return 0;
}
if (!rsa_param_decode(rsa, alg)) {
RSA_free(rsa);
return 0;
}
if (!EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, rsa)) {
RSA_free(rsa);
return 0;
}
return 1;
}
static int
rsa_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
{
if (BN_cmp(b->pkey.rsa->n, a->pkey.rsa->n) != 0 ||
BN_cmp(b->pkey.rsa->e, a->pkey.rsa->e) != 0)
return 0;
return 1;
}
static int
old_rsa_priv_decode(EVP_PKEY *pkey, const unsigned char **pder, int derlen)
{
RSA *rsa;
int ret = 0;
if ((rsa = d2i_RSAPrivateKey(NULL, pder, derlen)) == NULL) {
RSAerror(ERR_R_RSA_LIB);
goto err;
}
if (!EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, rsa))
goto err;
rsa = NULL;
ret = 1;
err:
RSA_free(rsa);
return ret;
}
static int
old_rsa_priv_encode(const EVP_PKEY *pkey, unsigned char **pder)
{
return i2d_RSAPrivateKey(pkey->pkey.rsa, pder);
}
static int
rsa_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
{
ASN1_STRING *str = NULL;
ASN1_OBJECT *aobj;
int strtype;
unsigned char *rk = NULL;
int rklen = 0;
if (!rsa_param_encode(pkey, &str, &strtype))
goto err;
if ((rklen = i2d_RSAPrivateKey(pkey->pkey.rsa, &rk)) <= 0) {
RSAerror(ERR_R_MALLOC_FAILURE);
rklen = 0;
goto err;
}
if ((aobj = OBJ_nid2obj(pkey->ameth->pkey_id)) == NULL)
goto err;
if (!PKCS8_pkey_set0(p8, aobj, 0, strtype, str, rk, rklen)) {
RSAerror(ERR_R_MALLOC_FAILURE);
goto err;
}
return 1;
err:
ASN1_STRING_free(str);
freezero(rk, rklen);
return 0;
}
static int
rsa_priv_decode(EVP_PKEY *pkey, const PKCS8_PRIV_KEY_INFO *p8)
{
const unsigned char *p;
RSA *rsa = NULL;
int pklen;
const X509_ALGOR *alg;
int ret = 0;
if (!PKCS8_pkey_get0(NULL, &p, &pklen, &alg, p8))
goto err;
if ((rsa = d2i_RSAPrivateKey(NULL, &p, pklen)) == NULL)
goto err;
if (!rsa_param_decode(rsa, alg))
goto err;
if (!EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, rsa))
goto err;
rsa = NULL;
ret = 1;
err:
RSA_free(rsa);
return ret;
}
static int
rsa_size(const EVP_PKEY *pkey)
{
return RSA_size(pkey->pkey.rsa);
}
static int
rsa_bits(const EVP_PKEY *pkey)
{
return BN_num_bits(pkey->pkey.rsa->n);
}
static int
rsa_security_bits(const EVP_PKEY *pkey)
{
return RSA_security_bits(pkey->pkey.rsa);
}
static void
rsa_free(EVP_PKEY *pkey)
{
RSA_free(pkey->pkey.rsa);
}
static X509_ALGOR *
rsa_mgf1_decode(X509_ALGOR *alg)
{
if (OBJ_obj2nid(alg->algorithm) != NID_mgf1)
return NULL;
return ASN1_TYPE_unpack_sequence(&X509_ALGOR_it, alg->parameter);
}
static RSA_PSS_PARAMS *
rsa_pss_decode(const X509_ALGOR *alg)
{
RSA_PSS_PARAMS *pss;
pss = ASN1_TYPE_unpack_sequence(&RSA_PSS_PARAMS_it, alg->parameter);
if (pss == NULL)
return NULL;
if (pss->maskGenAlgorithm != NULL) {
pss->maskHash = rsa_mgf1_decode(pss->maskGenAlgorithm);
if (pss->maskHash == NULL) {
RSA_PSS_PARAMS_free(pss);
return NULL;
}
}
return pss;
}
static int
rsa_pss_param_print(BIO *bp, int pss_key, RSA_PSS_PARAMS *pss, int indent)
{
int rv = 0;
X509_ALGOR *maskHash = NULL;
if (!BIO_indent(bp, indent, 128))
goto err;
if (pss_key) {
if (pss == NULL) {
if (BIO_puts(bp, "No PSS parameter restrictions\n") <= 0)
return 0;
return 1;
} else {
if (BIO_puts(bp, "PSS parameter restrictions:") <= 0)
return 0;
}
} else if (pss == NULL) {
if (BIO_puts(bp,"(INVALID PSS PARAMETERS)\n") <= 0)
return 0;
return 1;
}
if (BIO_puts(bp, "\n") <= 0)
goto err;
if (pss_key)
indent += 2;
if (!BIO_indent(bp, indent, 128))
goto err;
if (BIO_puts(bp, "Hash Algorithm: ") <= 0)
goto err;
if (pss->hashAlgorithm) {
if (i2a_ASN1_OBJECT(bp, pss->hashAlgorithm->algorithm) <= 0)
goto err;
} else if (BIO_puts(bp, "sha1 (default)") <= 0) {
goto err;
}
if (BIO_puts(bp, "\n") <= 0)
goto err;
if (!BIO_indent(bp, indent, 128))
goto err;
if (BIO_puts(bp, "Mask Algorithm: ") <= 0)
goto err;
if (pss->maskGenAlgorithm) {
if (i2a_ASN1_OBJECT(bp, pss->maskGenAlgorithm->algorithm) <= 0)
goto err;
if (BIO_puts(bp, " with ") <= 0)
goto err;
maskHash = rsa_mgf1_decode(pss->maskGenAlgorithm);
if (maskHash != NULL) {
if (i2a_ASN1_OBJECT(bp, maskHash->algorithm) <= 0)
goto err;
} else if (BIO_puts(bp, "INVALID") <= 0) {
goto err;
}
} else if (BIO_puts(bp, "mgf1 with sha1 (default)") <= 0) {
goto err;
}
BIO_puts(bp, "\n");
if (!BIO_indent(bp, indent, 128))
goto err;
if (BIO_printf(bp, "%s Salt Length: 0x", pss_key ? "Minimum" : "") <= 0)
goto err;
if (pss->saltLength) {
if (i2a_ASN1_INTEGER(bp, pss->saltLength) <= 0)
goto err;
} else if (BIO_puts(bp, "14 (default)") <= 0) {
goto err;
}
BIO_puts(bp, "\n");
if (!BIO_indent(bp, indent, 128))
goto err;
if (BIO_puts(bp, "Trailer Field: 0x") <= 0)
goto err;
if (pss->trailerField) {
if (i2a_ASN1_INTEGER(bp, pss->trailerField) <= 0)
goto err;
} else if (BIO_puts(bp, "BC (default)") <= 0) {
goto err;
}
BIO_puts(bp, "\n");
rv = 1;
err:
X509_ALGOR_free(maskHash);
return rv;
}
static int
pkey_rsa_print(BIO *bp, const EVP_PKEY *pkey, int off, int priv)
{
const RSA *x = pkey->pkey.rsa;
char *str;
const char *s;
int ret = 0, mod_len = 0;
if (x->n != NULL)
mod_len = BN_num_bits(x->n);
if (!BIO_indent(bp, off, 128))
goto err;
if (BIO_printf(bp, "%s ", pkey_is_pss(pkey) ? "RSA-PSS" : "RSA") <= 0)
goto err;
if (priv && x->d != NULL) {
if (BIO_printf(bp, "Private-Key: (%d bit)\n", mod_len) <= 0)
goto err;
str = "modulus:";
s = "publicExponent:";
} else {
if (BIO_printf(bp, "Public-Key: (%d bit)\n", mod_len) <= 0)
goto err;
str = "Modulus:";
s = "Exponent:";
}
if (!bn_printf(bp, x->n, off, "%s", str))
goto err;
if (!bn_printf(bp, x->e, off, "%s", s))
goto err;
if (priv) {
if (!bn_printf(bp, x->d, off, "privateExponent:"))
goto err;
if (!bn_printf(bp, x->p, off, "prime1:"))
goto err;
if (!bn_printf(bp, x->q, off, "prime2:"))
goto err;
if (!bn_printf(bp, x->dmp1, off, "exponent1:"))
goto err;
if (!bn_printf(bp, x->dmq1, off, "exponent2:"))
goto err;
if (!bn_printf(bp, x->iqmp, off, "coefficient:"))
goto err;
}
if (pkey_is_pss(pkey) && !rsa_pss_param_print(bp, 1, x->pss, off))
goto err;
ret = 1;
err:
return ret;
}
static int
rsa_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent, ASN1_PCTX *ctx)
{
return pkey_rsa_print(bp, pkey, indent, 0);
}
static int
rsa_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent, ASN1_PCTX *ctx)
{
return pkey_rsa_print(bp, pkey, indent, 1);
}
static int
rsa_sig_print(BIO *bp, const X509_ALGOR *sigalg, const ASN1_STRING *sig,
int indent, ASN1_PCTX *pctx)
{
if (OBJ_obj2nid(sigalg->algorithm) == EVP_PKEY_RSA_PSS) {
int rv;
RSA_PSS_PARAMS *pss = rsa_pss_decode(sigalg);
rv = rsa_pss_param_print(bp, 0, pss, indent);
RSA_PSS_PARAMS_free(pss);
if (!rv)
return 0;
} else if (!sig && BIO_puts(bp, "\n") <= 0) {
return 0;
}
if (sig)
return X509_signature_dump(bp, sig, indent);
return 1;
}
static int
rsa_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
{
X509_ALGOR *alg = NULL;
const EVP_MD *md;
const EVP_MD *mgf1md;
int min_saltlen;
switch (op) {
case ASN1_PKEY_CTRL_PKCS7_SIGN:
if (arg1 == 0)
PKCS7_SIGNER_INFO_get0_algs(arg2, NULL, NULL, &alg);
break;
case ASN1_PKEY_CTRL_PKCS7_ENCRYPT:
if (pkey_is_pss(pkey))
return -2;
if (arg1 == 0)
PKCS7_RECIP_INFO_get0_alg(arg2, &alg);
break;
#ifndef OPENSSL_NO_CMS
case ASN1_PKEY_CTRL_CMS_SIGN:
if (arg1 == 0)
return rsa_cms_sign(arg2);
else if (arg1 == 1)
return rsa_cms_verify(arg2);
break;
case ASN1_PKEY_CTRL_CMS_ENVELOPE:
if (pkey_is_pss(pkey))
return -2;
if (arg1 == 0)
return rsa_cms_encrypt(arg2);
else if (arg1 == 1)
return rsa_cms_decrypt(arg2);
break;
case ASN1_PKEY_CTRL_CMS_RI_TYPE:
if (pkey_is_pss(pkey))
return -2;
*(int *)arg2 = CMS_RECIPINFO_TRANS;
return 1;
#endif
case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
if (pkey->pkey.rsa->pss != NULL) {
if (!rsa_pss_get_param(pkey->pkey.rsa->pss, &md, &mgf1md,
&min_saltlen)) {
RSAerror(ERR_R_INTERNAL_ERROR);
return 0;
}
*(int *)arg2 = EVP_MD_type(md);
/* Return of 2 indicates this MD is mandatory */
return 2;
}
*(int *)arg2 = NID_sha256;
return 1;
default:
return -2;
}
if (alg != NULL)
return rsa_alg_set_pkcs1_padding(alg);
return 1;
}
static int
rsa_md_to_algor(const EVP_MD *md, X509_ALGOR **out_alg)
{
X509_ALGOR *alg = NULL;
int ret = 0;
X509_ALGOR_free(*out_alg);
*out_alg = NULL;
/* RFC 8017 - default hash is SHA-1 and hence omitted. */
if (md == NULL || EVP_MD_type(md) == NID_sha1)
goto done;
if ((alg = X509_ALGOR_new()) == NULL)
goto err;
if (!X509_ALGOR_set_evp_md(alg, md))
goto err;
done:
*out_alg = alg;
alg = NULL;
ret = 1;
err:
X509_ALGOR_free(alg);
return ret;
}
/*
* RFC 8017, A.2.1 and A.2.3 - encode maskGenAlgorithm for RSAES-OAEP
* and RSASSA-PSS. The default is mgfSHA1 and hence omitted.
*/
static int
rsa_mgf1md_to_maskGenAlgorithm(const EVP_MD *mgf1md, X509_ALGOR **out_alg)
{
X509_ALGOR *alg = NULL;
X509_ALGOR *inner_alg = NULL;
ASN1_STRING *astr = NULL;
int ret = 0;
X509_ALGOR_free(*out_alg);
*out_alg = NULL;
if (mgf1md == NULL || EVP_MD_type(mgf1md) == NID_sha1)
goto done;
if ((inner_alg = X509_ALGOR_new()) == NULL)
goto err;
if (!X509_ALGOR_set_evp_md(inner_alg, mgf1md))
goto err;
if ((astr = ASN1_item_pack(inner_alg, &X509_ALGOR_it, NULL)) == NULL)
goto err;
if ((alg = X509_ALGOR_new()) == NULL)
goto err;
if (!X509_ALGOR_set0_by_nid(alg, NID_mgf1, V_ASN1_SEQUENCE, astr))
goto err;
astr = NULL;
done:
*out_alg = alg;
alg = NULL;
ret = 1;
err:
X509_ALGOR_free(alg);
X509_ALGOR_free(inner_alg);
ASN1_STRING_free(astr);
return ret;
}
/* Convert algorithm ID to EVP_MD, defaults to SHA1. */
static const EVP_MD *
rsa_algor_to_md(X509_ALGOR *alg)
{
const EVP_MD *md;
if (!alg)
return EVP_sha1();
md = EVP_get_digestbyobj(alg->algorithm);
if (md == NULL)
RSAerror(RSA_R_UNKNOWN_DIGEST);
return md;
}
/*
* Convert EVP_PKEY_CTX in PSS mode into corresponding algorithm parameter,
* suitable for setting an AlgorithmIdentifier.
*/
static RSA_PSS_PARAMS *
rsa_ctx_to_pss(EVP_PKEY_CTX *pkey_ctx)
{
const EVP_MD *sigmd, *mgf1md;
EVP_PKEY *pk = EVP_PKEY_CTX_get0_pkey(pkey_ctx);
int saltlen;
if (EVP_PKEY_CTX_get_signature_md(pkey_ctx, &sigmd) <= 0)
return NULL;
if (EVP_PKEY_CTX_get_rsa_mgf1_md(pkey_ctx, &mgf1md) <= 0)
return NULL;
if (!EVP_PKEY_CTX_get_rsa_pss_saltlen(pkey_ctx, &saltlen))
return NULL;
if (saltlen == -1) {
saltlen = EVP_MD_size(sigmd);
} else if (saltlen == -2 || saltlen == -3) {
saltlen = EVP_PKEY_size(pk) - EVP_MD_size(sigmd) - 2;
if ((EVP_PKEY_bits(pk) & 0x7) == 1)
saltlen--;
if (saltlen < 0)
return NULL;
}
return rsa_pss_params_create(sigmd, mgf1md, saltlen);
}
RSA_PSS_PARAMS *
rsa_pss_params_create(const EVP_MD *sigmd, const EVP_MD *mgf1md, int saltlen)
{
RSA_PSS_PARAMS *pss = NULL;
if (mgf1md == NULL)
mgf1md = sigmd;
if ((pss = RSA_PSS_PARAMS_new()) == NULL)
goto err;
if (!rsa_md_to_algor(sigmd, &pss->hashAlgorithm))
goto err;
if (!rsa_mgf1md_to_maskGenAlgorithm(mgf1md, &pss->maskGenAlgorithm))
goto err;
/* Translate mgf1md to X509_ALGOR in decoded form for internal use. */
if (!rsa_md_to_algor(mgf1md, &pss->maskHash))
goto err;
/* RFC 8017, A.2.3 - default saltLength is SHA_DIGEST_LENGTH. */
if (saltlen != SHA_DIGEST_LENGTH) {
if ((pss->saltLength = ASN1_INTEGER_new()) == NULL)
goto err;
if (!ASN1_INTEGER_set(pss->saltLength, saltlen))
goto err;
}
return pss;
err:
RSA_PSS_PARAMS_free(pss);
return NULL;
}
/*
* From PSS AlgorithmIdentifier set public key parameters. If pkey isn't NULL
* then the EVP_MD_CTX is setup and initialised. If it is NULL parameters are
* passed to pkey_ctx instead.
*/
static int
rsa_pss_to_ctx(EVP_MD_CTX *ctx, EVP_PKEY_CTX *pkey_ctx,
X509_ALGOR *sigalg, EVP_PKEY *pkey)
{
int rv = -1;
int saltlen;
const EVP_MD *mgf1md = NULL, *md = NULL;
RSA_PSS_PARAMS *pss;
/* Sanity check: make sure it is PSS */
if (OBJ_obj2nid(sigalg->algorithm) != EVP_PKEY_RSA_PSS) {
RSAerror(RSA_R_UNSUPPORTED_SIGNATURE_TYPE);
return -1;
}
/* Decode PSS parameters */
pss = rsa_pss_decode(sigalg);
if (!rsa_pss_get_param(pss, &md, &mgf1md, &saltlen)) {
RSAerror(RSA_R_INVALID_PSS_PARAMETERS);
goto err;
}
/* We have all parameters now set up context */
if (pkey) {
if (!EVP_DigestVerifyInit(ctx, &pkey_ctx, md, NULL, pkey))
goto err;
} else {
const EVP_MD *checkmd;
if (EVP_PKEY_CTX_get_signature_md(pkey_ctx, &checkmd) <= 0)
goto err;
if (EVP_MD_type(md) != EVP_MD_type(checkmd)) {
RSAerror(RSA_R_DIGEST_DOES_NOT_MATCH);
goto err;
}
}
if (EVP_PKEY_CTX_set_rsa_padding(pkey_ctx, RSA_PKCS1_PSS_PADDING) <= 0)
goto err;
if (EVP_PKEY_CTX_set_rsa_pss_saltlen(pkey_ctx, saltlen) <= 0)
goto err;
if (EVP_PKEY_CTX_set_rsa_mgf1_md(pkey_ctx, mgf1md) <= 0)
goto err;
/* Carry on */
rv = 1;
err:
RSA_PSS_PARAMS_free(pss);
return rv;
}
int
rsa_pss_get_param(const RSA_PSS_PARAMS *pss, const EVP_MD **pmd,
const EVP_MD **pmgf1md, int *psaltlen)
{
if (pss == NULL)
return 0;
*pmd = rsa_algor_to_md(pss->hashAlgorithm);
if (*pmd == NULL)
return 0;
*pmgf1md = rsa_algor_to_md(pss->maskHash);
if (*pmgf1md == NULL)
return 0;
if (pss->saltLength) {
*psaltlen = ASN1_INTEGER_get(pss->saltLength);
if (*psaltlen < 0) {
RSAerror(RSA_R_INVALID_SALT_LENGTH);
return 0;
}
} else {
*psaltlen = 20;
}
/*
* low-level routines support only trailer field 0xbc (value 1) and
* PKCS#1 says we should reject any other value anyway.
*/
if (pss->trailerField && ASN1_INTEGER_get(pss->trailerField) != 1) {
RSAerror(RSA_R_INVALID_TRAILER);
return 0;
}
return 1;
}
#ifndef OPENSSL_NO_CMS
static int
rsa_cms_verify(CMS_SignerInfo *si)
{
int nid, nid2;
X509_ALGOR *alg;
EVP_PKEY_CTX *pkey_ctx = CMS_SignerInfo_get0_pkey_ctx(si);
CMS_SignerInfo_get0_algs(si, NULL, NULL, NULL, &alg);
nid = OBJ_obj2nid(alg->algorithm);
if (nid == EVP_PKEY_RSA_PSS)
return rsa_pss_to_ctx(NULL, pkey_ctx, alg, NULL);
/* Only PSS allowed for PSS keys */
if (pkey_ctx_is_pss(pkey_ctx)) {
RSAerror(RSA_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE);
return 0;
}
if (nid == NID_rsaEncryption)
return 1;
/* Workaround for some implementation that use a signature OID */
if (OBJ_find_sigid_algs(nid, NULL, &nid2)) {
if (nid2 == NID_rsaEncryption)
return 1;
}
return 0;
}
#endif
/*
* Customised RSA item verification routine. This is called when a signature
* is encountered requiring special handling. We currently only handle PSS.
*/
static int
rsa_item_verify(EVP_MD_CTX *ctx, const ASN1_ITEM *it, void *asn,
X509_ALGOR *sigalg, ASN1_BIT_STRING *sig, EVP_PKEY *pkey)
{
/* Sanity check: make sure it is PSS */
if (OBJ_obj2nid(sigalg->algorithm) != EVP_PKEY_RSA_PSS) {
RSAerror(RSA_R_UNSUPPORTED_SIGNATURE_TYPE);
return -1;
}
if (rsa_pss_to_ctx(ctx, NULL, sigalg, pkey) > 0) {
/* Carry on */
return 2;
}
return -1;
}
static int
rsa_alg_set_pkcs1_padding(X509_ALGOR *alg)
{
return X509_ALGOR_set0_by_nid(alg, NID_rsaEncryption, V_ASN1_NULL, NULL);
}
static int
rsa_alg_set_pss_padding(X509_ALGOR *alg, EVP_PKEY_CTX *pkey_ctx)
{
RSA_PSS_PARAMS *pss = NULL;
ASN1_STRING *astr = NULL;
int ret = 0;
if (pkey_ctx == NULL)
goto err;
if ((pss = rsa_ctx_to_pss(pkey_ctx)) == NULL)
goto err;
if ((astr = ASN1_item_pack(pss, &RSA_PSS_PARAMS_it, NULL)) == NULL)
goto err;
if (!X509_ALGOR_set0_by_nid(alg, EVP_PKEY_RSA_PSS, V_ASN1_SEQUENCE, astr))
goto err;
astr = NULL;
ret = 1;
err:
ASN1_STRING_free(astr);
RSA_PSS_PARAMS_free(pss);
return ret;
}
#ifndef OPENSSL_NO_CMS
static int
rsa_alg_set_oaep_padding(X509_ALGOR *alg, EVP_PKEY_CTX *pkey_ctx)
{
const EVP_MD *md, *mgf1md;
RSA_OAEP_PARAMS *oaep = NULL;
ASN1_STRING *astr = NULL;
ASN1_OCTET_STRING *ostr = NULL;
unsigned char *label;
int labellen;
int ret = 0;
if (EVP_PKEY_CTX_get_rsa_oaep_md(pkey_ctx, &md) <= 0)
goto err;
if (EVP_PKEY_CTX_get_rsa_mgf1_md(pkey_ctx, &mgf1md) <= 0)
goto err;
labellen = EVP_PKEY_CTX_get0_rsa_oaep_label(pkey_ctx, &label);
if (labellen < 0)
goto err;
if ((oaep = RSA_OAEP_PARAMS_new()) == NULL)
goto err;
if (!rsa_md_to_algor(md, &oaep->hashFunc))
goto err;
if (!rsa_mgf1md_to_maskGenAlgorithm(mgf1md, &oaep->maskGenFunc))
goto err;
/* XXX - why do we not set oaep->maskHash here? */
if (labellen > 0) {
if ((oaep->pSourceFunc = X509_ALGOR_new()) == NULL)
goto err;
if ((ostr = ASN1_OCTET_STRING_new()) == NULL)
goto err;
if (!ASN1_OCTET_STRING_set(ostr, label, labellen))
goto err;
if (!X509_ALGOR_set0_by_nid(oaep->pSourceFunc, NID_pSpecified,
V_ASN1_OCTET_STRING, ostr))
goto err;
ostr = NULL;
}
if ((astr = ASN1_item_pack(oaep, &RSA_OAEP_PARAMS_it, NULL)) == NULL)
goto err;
if (!X509_ALGOR_set0_by_nid(alg, NID_rsaesOaep, V_ASN1_SEQUENCE, astr))
goto err;
astr = NULL;
ret = 1;
err:
RSA_OAEP_PARAMS_free(oaep);
ASN1_STRING_free(astr);
ASN1_OCTET_STRING_free(ostr);
return ret;
}
static int
rsa_cms_sign(CMS_SignerInfo *si)
{
EVP_PKEY_CTX *pkey_ctx;
X509_ALGOR *alg;
int pad_mode = RSA_PKCS1_PADDING;
if ((pkey_ctx = CMS_SignerInfo_get0_pkey_ctx(si)) != NULL) {
if (EVP_PKEY_CTX_get_rsa_padding(pkey_ctx, &pad_mode) <= 0)
return 0;
}
CMS_SignerInfo_get0_algs(si, NULL, NULL, NULL, &alg);
if (pad_mode == RSA_PKCS1_PADDING)
return rsa_alg_set_pkcs1_padding(alg);
if (pad_mode == RSA_PKCS1_PSS_PADDING)
return rsa_alg_set_pss_padding(alg, pkey_ctx);
return 0;
}
#endif
static int
rsa_item_sign(EVP_MD_CTX *ctx, const ASN1_ITEM *it, void *asn,
X509_ALGOR *alg1, X509_ALGOR *alg2, ASN1_BIT_STRING *sig)
{
EVP_PKEY_CTX *pkey_ctx = ctx->pctx;
int pad_mode;
if (EVP_PKEY_CTX_get_rsa_padding(pkey_ctx, &pad_mode) <= 0)
return 0;
if (pad_mode == RSA_PKCS1_PADDING)
return 2;
if (pad_mode == RSA_PKCS1_PSS_PADDING) {
if (!rsa_alg_set_pss_padding(alg1, pkey_ctx))
return 0;
if (alg2 != NULL) {
if (!rsa_alg_set_pss_padding(alg2, pkey_ctx))
return 0;
}
return 3;
}
return 2;
}
static int
rsa_pkey_check(const EVP_PKEY *pkey)
{
return RSA_check_key(pkey->pkey.rsa);
}
#ifndef OPENSSL_NO_CMS
static RSA_OAEP_PARAMS *
rsa_oaep_decode(const X509_ALGOR *alg)
{
RSA_OAEP_PARAMS *oaep;
oaep = ASN1_TYPE_unpack_sequence(&RSA_OAEP_PARAMS_it, alg->parameter);
if (oaep == NULL)
return NULL;
if (oaep->maskGenFunc != NULL) {
oaep->maskHash = rsa_mgf1_decode(oaep->maskGenFunc);
if (oaep->maskHash == NULL) {
RSA_OAEP_PARAMS_free(oaep);
return NULL;
}
}
return oaep;
}
static int
rsa_cms_decrypt(CMS_RecipientInfo *ri)
{
EVP_PKEY_CTX *pkctx;
X509_ALGOR *cmsalg;
int nid;
int rv = -1;
unsigned char *label = NULL;
int labellen = 0;
const EVP_MD *mgf1md = NULL, *md = NULL;
RSA_OAEP_PARAMS *oaep;
pkctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
if (pkctx == NULL)
return 0;
if (!CMS_RecipientInfo_ktri_get0_algs(ri, NULL, NULL, &cmsalg))
return -1;
nid = OBJ_obj2nid(cmsalg->algorithm);
if (nid == NID_rsaEncryption)
return 1;
if (nid != NID_rsaesOaep) {
RSAerror(RSA_R_UNSUPPORTED_ENCRYPTION_TYPE);
return -1;
}
/* Decode OAEP parameters */
oaep = rsa_oaep_decode(cmsalg);
if (oaep == NULL) {
RSAerror(RSA_R_INVALID_OAEP_PARAMETERS);
goto err;
}
mgf1md = rsa_algor_to_md(oaep->maskHash);
if (mgf1md == NULL)
goto err;
md = rsa_algor_to_md(oaep->hashFunc);
if (md == NULL)
goto err;
if (oaep->pSourceFunc != NULL) {
X509_ALGOR *plab = oaep->pSourceFunc;
if (OBJ_obj2nid(plab->algorithm) != NID_pSpecified) {
RSAerror(RSA_R_UNSUPPORTED_LABEL_SOURCE);
goto err;
}
if (plab->parameter->type != V_ASN1_OCTET_STRING) {
RSAerror(RSA_R_INVALID_LABEL);
goto err;
}
label = plab->parameter->value.octet_string->data;
/* Stop label being freed when OAEP parameters are freed */
/* XXX - this leaks label on error... */
plab->parameter->value.octet_string->data = NULL;
labellen = plab->parameter->value.octet_string->length;
}
if (EVP_PKEY_CTX_set_rsa_padding(pkctx, RSA_PKCS1_OAEP_PADDING) <= 0)
goto err;
if (EVP_PKEY_CTX_set_rsa_oaep_md(pkctx, md) <= 0)
goto err;
if (EVP_PKEY_CTX_set_rsa_mgf1_md(pkctx, mgf1md) <= 0)
goto err;
if (EVP_PKEY_CTX_set0_rsa_oaep_label(pkctx, label, labellen) <= 0)
goto err;
rv = 1;
err:
RSA_OAEP_PARAMS_free(oaep);
return rv;
}
static int
rsa_cms_encrypt(CMS_RecipientInfo *ri)
{
X509_ALGOR *alg;
EVP_PKEY_CTX *pkey_ctx;
int pad_mode = RSA_PKCS1_PADDING;
if ((pkey_ctx = CMS_RecipientInfo_get0_pkey_ctx(ri)) != NULL) {
if (EVP_PKEY_CTX_get_rsa_padding(pkey_ctx, &pad_mode) <= 0)
return 0;
}
if (!CMS_RecipientInfo_ktri_get0_algs(ri, NULL, NULL, &alg))
return 0;
if (pad_mode == RSA_PKCS1_PADDING)
return rsa_alg_set_pkcs1_padding(alg);
if (pad_mode == RSA_PKCS1_OAEP_PADDING)
return rsa_alg_set_oaep_padding(alg, pkey_ctx);
return 0;
}
#endif
const EVP_PKEY_ASN1_METHOD rsa_asn1_meth = {
.base_method = &rsa_asn1_meth,
.pkey_id = EVP_PKEY_RSA,
.pkey_flags = ASN1_PKEY_SIGPARAM_NULL,
.pem_str = "RSA",
.info = "OpenSSL RSA method",
.pub_decode = rsa_pub_decode,
.pub_encode = rsa_pub_encode,
.pub_cmp = rsa_pub_cmp,
.pub_print = rsa_pub_print,
.priv_decode = rsa_priv_decode,
.priv_encode = rsa_priv_encode,
.priv_print = rsa_priv_print,
.pkey_size = rsa_size,
.pkey_bits = rsa_bits,
.pkey_security_bits = rsa_security_bits,
.sig_print = rsa_sig_print,
.pkey_free = rsa_free,
.pkey_ctrl = rsa_pkey_ctrl,
.old_priv_decode = old_rsa_priv_decode,
.old_priv_encode = old_rsa_priv_encode,
.item_verify = rsa_item_verify,
.item_sign = rsa_item_sign,
.pkey_check = rsa_pkey_check,
};
const EVP_PKEY_ASN1_METHOD rsa2_asn1_meth = {
.base_method = &rsa_asn1_meth,
.pkey_id = EVP_PKEY_RSA2,
.pkey_flags = ASN1_PKEY_ALIAS,
.pkey_check = rsa_pkey_check,
};
const EVP_PKEY_ASN1_METHOD rsa_pss_asn1_meth = {
.base_method = &rsa_pss_asn1_meth,
.pkey_id = EVP_PKEY_RSA_PSS,
.pkey_flags = ASN1_PKEY_SIGPARAM_NULL,
.pem_str = "RSA-PSS",
.info = "OpenSSL RSA-PSS method",
.pub_decode = rsa_pub_decode,
.pub_encode = rsa_pub_encode,
.pub_cmp = rsa_pub_cmp,
.pub_print = rsa_pub_print,
.priv_decode = rsa_priv_decode,
.priv_encode = rsa_priv_encode,
.priv_print = rsa_priv_print,
.pkey_size = rsa_size,
.pkey_bits = rsa_bits,
.pkey_security_bits = rsa_security_bits,
.sig_print = rsa_sig_print,
.pkey_free = rsa_free,
.pkey_ctrl = rsa_pkey_ctrl,
.item_verify = rsa_item_verify,
.item_sign = rsa_item_sign
};
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