/*
- * Copyright 2006-2016 The OpenSSL Project Authors. All Rights Reserved.
+ * Copyright 2006-2020 The OpenSSL Project Authors. All Rights Reserved.
*
- * Licensed under the OpenSSL license (the "License"). You may not use
+ * 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 "internal/constant_time.h"
+
#include <stdio.h>
#include "internal/cryptlib.h"
#include <openssl/asn1t.h>
#include <openssl/evp.h>
#include <openssl/x509v3.h>
#include <openssl/cms.h>
-#include "internal/evp_int.h"
-#include "rsa_locl.h"
+#include "crypto/evp.h"
+#include "crypto/rsa.h"
+#include "rsa_local.h"
/* RSA pkey context structure */
/* Key gen parameters */
int nbits;
BIGNUM *pub_exp;
+ int primes;
/* Keygen callback info */
int gentmp[2];
/* RSA padding mode */
const EVP_MD *mgf1md;
/* PSS salt length */
int saltlen;
+ /* Minimum salt length or -1 if no PSS parameter restriction */
+ int min_saltlen;
/* Temp buffer */
unsigned char *tbuf;
/* OAEP label */
size_t oaep_labellen;
} RSA_PKEY_CTX;
+/* True if PSS parameters are restricted */
+#define rsa_pss_restricted(rctx) (rctx->min_saltlen != -1)
+
static int pkey_rsa_init(EVP_PKEY_CTX *ctx)
{
- RSA_PKEY_CTX *rctx;
- rctx = OPENSSL_zalloc(sizeof(*rctx));
+ RSA_PKEY_CTX *rctx = OPENSSL_zalloc(sizeof(*rctx));
+
if (rctx == NULL)
return 0;
- rctx->nbits = 1024;
- rctx->pad_mode = RSA_PKCS1_PADDING;
- rctx->saltlen = -2;
+ rctx->nbits = 2048;
+ rctx->primes = RSA_DEFAULT_PRIME_NUM;
+ if (pkey_ctx_is_pss(ctx))
+ rctx->pad_mode = RSA_PKCS1_PSS_PADDING;
+ else
+ rctx->pad_mode = RSA_PKCS1_PADDING;
+ /* Maximum for sign, auto for verify */
+ rctx->saltlen = RSA_PSS_SALTLEN_AUTO;
+ rctx->min_saltlen = -1;
ctx->data = rctx;
ctx->keygen_info = rctx->gentmp;
ctx->keygen_info_count = 2;
return 1;
}
-static int pkey_rsa_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
+static int pkey_rsa_copy(EVP_PKEY_CTX *dst, const EVP_PKEY_CTX *src)
{
RSA_PKEY_CTX *dctx, *sctx;
+
if (!pkey_rsa_init(dst))
return 0;
sctx = src->data;
dctx->pad_mode = sctx->pad_mode;
dctx->md = sctx->md;
dctx->mgf1md = sctx->mgf1md;
+ dctx->saltlen = sctx->saltlen;
if (sctx->oaep_label) {
OPENSSL_free(dctx->oaep_label);
dctx->oaep_label = OPENSSL_memdup(sctx->oaep_label, sctx->oaep_labellen);
static int setup_tbuf(RSA_PKEY_CTX *ctx, EVP_PKEY_CTX *pk)
{
- if (ctx->tbuf)
+ if (ctx->tbuf != NULL)
return 1;
- ctx->tbuf = OPENSSL_malloc(EVP_PKEY_size(pk->pkey));
- if (ctx->tbuf == NULL)
+ if ((ctx->tbuf = OPENSSL_malloc(RSA_size(pk->pkey->pkey.rsa))) == NULL) {
+ RSAerr(RSA_F_SETUP_TBUF, ERR_R_MALLOC_FAILURE);
return 0;
+ }
return 1;
}
return ret;
ret = sltmp;
} else if (rctx->pad_mode == RSA_X931_PADDING) {
- if ((size_t)EVP_PKEY_size(ctx->pkey) < tbslen + 1) {
+ if ((size_t)RSA_size(rsa) < tbslen + 1) {
RSAerr(RSA_F_PKEY_RSA_SIGN, RSA_R_KEY_SIZE_TOO_SMALL);
return -1;
}
return -1;
ret = RSA_private_encrypt(RSA_size(rsa), rctx->tbuf,
sig, rsa, RSA_NO_PADDING);
- } else
+ } else {
return -1;
- } else
+ }
+ } else {
ret = RSA_private_encrypt(tbslen, tbs, sig, ctx->pkey->pkey.rsa,
rctx->pad_mode);
+ }
if (ret < 0)
return ret;
*siglen = ret;
if (ret <= 0)
return 0;
ret = sltmp;
- } else
+ } else {
return -1;
- } else
+ }
+ } else {
ret = RSA_public_decrypt(siglen, sig, rout, ctx->pkey->pkey.rsa,
rctx->pad_mode);
+ }
if (ret < 0)
return ret;
*routlen = ret;
RSA_PKEY_CTX *rctx = ctx->data;
RSA *rsa = ctx->pkey->pkey.rsa;
size_t rslen;
+
if (rctx->md) {
if (rctx->pad_mode == RSA_PKCS1_PADDING)
return RSA_verify(EVP_MD_type(rctx->md), tbs, tbslen,
if (ret <= 0)
return 0;
return 1;
- } else
+ } else {
return -1;
+ }
} else {
if (!setup_tbuf(rctx, ctx))
return -1;
{
int ret;
RSA_PKEY_CTX *rctx = ctx->data;
+
if (rctx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
int klen = RSA_size(ctx->pkey->pkey.rsa);
if (!setup_tbuf(rctx, ctx))
return -1;
ret = RSA_public_encrypt(klen, rctx->tbuf, out,
ctx->pkey->pkey.rsa, RSA_NO_PADDING);
- } else
+ } else {
ret = RSA_public_encrypt(inlen, in, out, ctx->pkey->pkey.rsa,
rctx->pad_mode);
+ }
if (ret < 0)
return ret;
*outlen = ret;
{
int ret;
RSA_PKEY_CTX *rctx = ctx->data;
+
if (rctx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
- int i;
if (!setup_tbuf(rctx, ctx))
return -1;
ret = RSA_private_decrypt(inlen, in, rctx->tbuf,
ctx->pkey->pkey.rsa, RSA_NO_PADDING);
if (ret <= 0)
return ret;
- for (i = 0; i < ret; i++) {
- if (rctx->tbuf[i])
- break;
- }
- ret = RSA_padding_check_PKCS1_OAEP_mgf1(out, ret, rctx->tbuf + i,
- ret - i, ret,
+ ret = RSA_padding_check_PKCS1_OAEP_mgf1(out, ret, rctx->tbuf,
+ ret, ret,
rctx->oaep_label,
rctx->oaep_labellen,
rctx->md, rctx->mgf1md);
- } else
+ } else {
ret = RSA_private_decrypt(inlen, in, out, ctx->pkey->pkey.rsa,
rctx->pad_mode);
- if (ret < 0)
- return ret;
- *outlen = ret;
- return 1;
+ }
+ *outlen = constant_time_select_s(constant_time_msb_s(ret), *outlen, ret);
+ ret = constant_time_select_int(constant_time_msb(ret), ret, 1);
+ return ret;
}
static int check_padding_md(const EVP_MD *md, int padding)
{
int mdnid;
+
if (!md)
return 1;
case NID_sha256:
case NID_sha384:
case NID_sha512:
+ case NID_sha512_224:
+ case NID_sha512_256:
case NID_md5:
case NID_md5_sha1:
case NID_md2:
case NID_md4:
case NID_mdc2:
case NID_ripemd160:
+ case NID_sha3_224:
+ case NID_sha3_256:
+ case NID_sha3_384:
+ case NID_sha3_512:
return 1;
default:
static int pkey_rsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
{
RSA_PKEY_CTX *rctx = ctx->data;
+
switch (type) {
case EVP_PKEY_CTRL_RSA_PADDING:
if ((p1 >= RSA_PKCS1_PADDING) && (p1 <= RSA_PKCS1_PSS_PADDING)) {
goto bad_pad;
if (!rctx->md)
rctx->md = EVP_sha1();
+ } else if (pkey_ctx_is_pss(ctx)) {
+ goto bad_pad;
}
if (p1 == RSA_PKCS1_OAEP_PADDING) {
if (!(ctx->operation & EVP_PKEY_OP_TYPE_CRYPT))
RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PSS_SALTLEN);
return -2;
}
- if (type == EVP_PKEY_CTRL_GET_RSA_PSS_SALTLEN)
+ if (type == EVP_PKEY_CTRL_GET_RSA_PSS_SALTLEN) {
*(int *)p2 = rctx->saltlen;
- else {
- if (p1 < -2)
+ } else {
+ if (p1 < RSA_PSS_SALTLEN_MAX)
return -2;
+ if (rsa_pss_restricted(rctx)) {
+ if (p1 == RSA_PSS_SALTLEN_AUTO
+ && ctx->operation == EVP_PKEY_OP_VERIFY) {
+ RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PSS_SALTLEN);
+ return -2;
+ }
+ if ((p1 == RSA_PSS_SALTLEN_DIGEST
+ && rctx->min_saltlen > EVP_MD_size(rctx->md))
+ || (p1 >= 0 && p1 < rctx->min_saltlen)) {
+ RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_PSS_SALTLEN_TOO_SMALL);
+ return 0;
+ }
+ }
rctx->saltlen = p1;
}
return 1;
case EVP_PKEY_CTRL_RSA_KEYGEN_BITS:
- if (p1 < 512) {
+ if (p1 < RSA_MIN_MODULUS_BITS) {
RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_KEY_SIZE_TOO_SMALL);
return -2;
}
rctx->pub_exp = p2;
return 1;
+ case EVP_PKEY_CTRL_RSA_KEYGEN_PRIMES:
+ if (p1 < RSA_DEFAULT_PRIME_NUM || p1 > RSA_MAX_PRIME_NUM) {
+ RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_KEY_PRIME_NUM_INVALID);
+ return -2;
+ }
+ rctx->primes = p1;
+ return 1;
+
case EVP_PKEY_CTRL_RSA_OAEP_MD:
case EVP_PKEY_CTRL_GET_RSA_OAEP_MD:
if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
case EVP_PKEY_CTRL_MD:
if (!check_padding_md(p2, rctx->pad_mode))
return 0;
+ if (rsa_pss_restricted(rctx)) {
+ if (EVP_MD_type(rctx->md) == EVP_MD_type(p2))
+ return 1;
+ RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_DIGEST_NOT_ALLOWED);
+ return 0;
+ }
rctx->md = p2;
return 1;
*(const EVP_MD **)p2 = rctx->mgf1md;
else
*(const EVP_MD **)p2 = rctx->md;
- } else
+ } else {
+ if (rsa_pss_restricted(rctx)) {
+ if (EVP_MD_type(rctx->mgf1md) == EVP_MD_type(p2))
+ return 1;
+ RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_MGF1_DIGEST_NOT_ALLOWED);
+ return 0;
+ }
rctx->mgf1md = p2;
+ }
return 1;
case EVP_PKEY_CTRL_RSA_OAEP_LABEL:
return rctx->oaep_labellen;
case EVP_PKEY_CTRL_DIGESTINIT:
+ case EVP_PKEY_CTRL_PKCS7_SIGN:
+#ifndef OPENSSL_NO_CMS
+ case EVP_PKEY_CTRL_CMS_SIGN:
+#endif
+ return 1;
+
case EVP_PKEY_CTRL_PKCS7_ENCRYPT:
case EVP_PKEY_CTRL_PKCS7_DECRYPT:
- case EVP_PKEY_CTRL_PKCS7_SIGN:
- return 1;
#ifndef OPENSSL_NO_CMS
case EVP_PKEY_CTRL_CMS_DECRYPT:
case EVP_PKEY_CTRL_CMS_ENCRYPT:
- case EVP_PKEY_CTRL_CMS_SIGN:
- return 1;
#endif
+ if (!pkey_ctx_is_pss(ctx))
+ return 1;
+ /* fall through */
case EVP_PKEY_CTRL_PEER_KEY:
RSAerr(RSA_F_PKEY_RSA_CTRL,
RSA_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
static int pkey_rsa_ctrl_str(EVP_PKEY_CTX *ctx,
const char *type, const char *value)
{
- if (!value) {
+ if (value == NULL) {
RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_VALUE_MISSING);
return 0;
}
if (strcmp(type, "rsa_padding_mode") == 0) {
int pm;
- if (strcmp(value, "pkcs1") == 0)
+
+ if (strcmp(value, "pkcs1") == 0) {
pm = RSA_PKCS1_PADDING;
- else if (strcmp(value, "sslv23") == 0)
+ } else if (strcmp(value, "sslv23") == 0) {
pm = RSA_SSLV23_PADDING;
- else if (strcmp(value, "none") == 0)
+ } else if (strcmp(value, "none") == 0) {
pm = RSA_NO_PADDING;
- else if (strcmp(value, "oeap") == 0)
+ } else if (strcmp(value, "oeap") == 0) {
pm = RSA_PKCS1_OAEP_PADDING;
- else if (strcmp(value, "oaep") == 0)
+ } else if (strcmp(value, "oaep") == 0) {
pm = RSA_PKCS1_OAEP_PADDING;
- else if (strcmp(value, "x931") == 0)
+ } else if (strcmp(value, "x931") == 0) {
pm = RSA_X931_PADDING;
- else if (strcmp(value, "pss") == 0)
+ } else if (strcmp(value, "pss") == 0) {
pm = RSA_PKCS1_PSS_PADDING;
- else {
+ } else {
RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_UNKNOWN_PADDING_TYPE);
return -2;
}
if (strcmp(type, "rsa_pss_saltlen") == 0) {
int saltlen;
- saltlen = atoi(value);
+
+ if (!strcmp(value, "digest"))
+ saltlen = RSA_PSS_SALTLEN_DIGEST;
+ else if (!strcmp(value, "max"))
+ saltlen = RSA_PSS_SALTLEN_MAX;
+ else if (!strcmp(value, "auto"))
+ saltlen = RSA_PSS_SALTLEN_AUTO;
+ else
+ saltlen = atoi(value);
return EVP_PKEY_CTX_set_rsa_pss_saltlen(ctx, saltlen);
}
if (strcmp(type, "rsa_keygen_bits") == 0) {
- int nbits;
- nbits = atoi(value);
+ int nbits = atoi(value);
+
return EVP_PKEY_CTX_set_rsa_keygen_bits(ctx, nbits);
}
if (strcmp(type, "rsa_keygen_pubexp") == 0) {
int ret;
+
BIGNUM *pubexp = NULL;
if (!BN_asc2bn(&pubexp, value))
return 0;
return ret;
}
+ if (strcmp(type, "rsa_keygen_primes") == 0) {
+ int nprimes = atoi(value);
+
+ return EVP_PKEY_CTX_set_rsa_keygen_primes(ctx, nprimes);
+ }
+
if (strcmp(type, "rsa_mgf1_md") == 0)
return EVP_PKEY_CTX_md(ctx,
EVP_PKEY_OP_TYPE_SIG | EVP_PKEY_OP_TYPE_CRYPT,
EVP_PKEY_CTRL_RSA_MGF1_MD, value);
- if (strcmp(type, "rsa_oaep_md") == 0) {
- const EVP_MD *md;
- if ((md = EVP_get_digestbyname(value)) == NULL) {
- RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_INVALID_DIGEST);
- return 0;
+ if (pkey_ctx_is_pss(ctx)) {
+
+ if (strcmp(type, "rsa_pss_keygen_mgf1_md") == 0)
+ return EVP_PKEY_CTX_md(ctx, EVP_PKEY_OP_KEYGEN,
+ EVP_PKEY_CTRL_RSA_MGF1_MD, value);
+
+ if (strcmp(type, "rsa_pss_keygen_md") == 0)
+ return EVP_PKEY_CTX_md(ctx, EVP_PKEY_OP_KEYGEN,
+ EVP_PKEY_CTRL_MD, value);
+
+ if (strcmp(type, "rsa_pss_keygen_saltlen") == 0) {
+ int saltlen = atoi(value);
+
+ return EVP_PKEY_CTX_set_rsa_pss_keygen_saltlen(ctx, saltlen);
}
}
unsigned char *lab;
long lablen;
int ret;
+
lab = OPENSSL_hexstr2buf(value, &lablen);
if (!lab)
return 0;
return -2;
}
+/* Set PSS parameters when generating a key, if necessary */
+static int rsa_set_pss_param(RSA *rsa, EVP_PKEY_CTX *ctx)
+{
+ RSA_PKEY_CTX *rctx = ctx->data;
+
+ if (!pkey_ctx_is_pss(ctx))
+ return 1;
+ /* If all parameters are default values don't set pss */
+ if (rctx->md == NULL && rctx->mgf1md == NULL && rctx->saltlen == -2)
+ return 1;
+ rsa->pss = rsa_pss_params_create(rctx->md, rctx->mgf1md,
+ rctx->saltlen == -2 ? 0 : rctx->saltlen);
+ if (rsa->pss == NULL)
+ return 0;
+ return 1;
+}
+
static int pkey_rsa_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
{
RSA *rsa = NULL;
RSA_PKEY_CTX *rctx = ctx->data;
BN_GENCB *pcb;
int ret;
+
if (rctx->pub_exp == NULL) {
rctx->pub_exp = BN_new();
if (rctx->pub_exp == NULL || !BN_set_word(rctx->pub_exp, RSA_F4))
return 0;
}
evp_pkey_set_cb_translate(pcb, ctx);
- } else
+ } else {
pcb = NULL;
- ret = RSA_generate_key_ex(rsa, rctx->nbits, rctx->pub_exp, pcb);
+ }
+ ret = RSA_generate_multi_prime_key(rsa, rctx->nbits, rctx->primes,
+ rctx->pub_exp, pcb);
BN_GENCB_free(pcb);
+ if (ret > 0 && !rsa_set_pss_param(rsa, ctx)) {
+ RSA_free(rsa);
+ return 0;
+ }
if (ret > 0)
EVP_PKEY_assign(pkey, ctx->pmeth->pkey_id, rsa);
else
return ret;
}
-const EVP_PKEY_METHOD rsa_pkey_meth = {
+static const EVP_PKEY_METHOD rsa_pkey_meth = {
EVP_PKEY_RSA,
EVP_PKEY_FLAG_AUTOARGLEN,
pkey_rsa_init,
pkey_rsa_ctrl_str
};
-const EVP_PKEY_METHOD rsa_pss_pkey_meth = {
+const EVP_PKEY_METHOD *rsa_pkey_method(void)
+{
+ return &rsa_pkey_meth;
+}
+
+/*
+ * Called for PSS sign or verify initialisation: checks PSS parameter
+ * sanity and sets any restrictions on key usage.
+ */
+
+static int pkey_pss_init(EVP_PKEY_CTX *ctx)
+{
+ RSA *rsa;
+ RSA_PKEY_CTX *rctx = ctx->data;
+ const EVP_MD *md;
+ const EVP_MD *mgf1md;
+ int min_saltlen, max_saltlen;
+
+ /* Should never happen */
+ if (!pkey_ctx_is_pss(ctx))
+ return 0;
+ rsa = ctx->pkey->pkey.rsa;
+ /* If no restrictions just return */
+ if (rsa->pss == NULL)
+ return 1;
+ /* Get and check parameters */
+ if (!rsa_pss_get_param(rsa->pss, &md, &mgf1md, &min_saltlen))
+ return 0;
+
+ /* See if minimum salt length exceeds maximum possible */
+ max_saltlen = RSA_size(rsa) - EVP_MD_size(md);
+ if ((RSA_bits(rsa) & 0x7) == 1)
+ max_saltlen--;
+ if (min_saltlen > max_saltlen) {
+ RSAerr(RSA_F_PKEY_PSS_INIT, RSA_R_INVALID_SALT_LENGTH);
+ return 0;
+ }
+
+ rctx->min_saltlen = min_saltlen;
+
+ /*
+ * Set PSS restrictions as defaults: we can then block any attempt to
+ * use invalid values in pkey_rsa_ctrl
+ */
+
+ rctx->md = md;
+ rctx->mgf1md = mgf1md;
+ rctx->saltlen = min_saltlen;
+
+ return 1;
+}
+
+static const EVP_PKEY_METHOD rsa_pss_pkey_meth = {
EVP_PKEY_RSA_PSS,
EVP_PKEY_FLAG_AUTOARGLEN,
pkey_rsa_init,
0,
pkey_rsa_keygen,
- 0,
+ pkey_pss_init,
pkey_rsa_sign,
- 0,
+ pkey_pss_init,
pkey_rsa_verify,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
pkey_rsa_ctrl,
pkey_rsa_ctrl_str
};
+
+const EVP_PKEY_METHOD *rsa_pss_pkey_method(void)
+{
+ return &rsa_pss_pkey_meth;
+}
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