575 lines
13 KiB
C
575 lines
13 KiB
C
/* crypto/rsa/rsa_pmeth.c */
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/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
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* project 2006.
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*/
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/* ====================================================================
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* Copyright (c) 2006 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* licensing@OpenSSL.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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#include <stdio.h>
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#include "cryptlib.h"
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#include <openssl/asn1t.h>
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#include <openssl/x509.h>
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#include <openssl/rsa.h>
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#include <openssl/evp.h>
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#include "evp_locl.h"
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#include "rsa_locl.h"
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/* RSA pkey context structure */
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typedef struct
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{
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/* Key gen parameters */
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int nbits;
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BIGNUM *pub_exp;
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/* Keygen callback info */
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int gentmp[2];
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/* RSA padding mode */
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int pad_mode;
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/* message digest */
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const EVP_MD *md;
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/* PSS/OAEP salt length */
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int saltlen;
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/* Temp buffer */
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unsigned char *tbuf;
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} RSA_PKEY_CTX;
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static int pkey_rsa_init(EVP_PKEY_CTX *ctx)
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{
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RSA_PKEY_CTX *rctx;
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rctx = OPENSSL_malloc(sizeof(RSA_PKEY_CTX));
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if (!rctx)
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return 0;
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rctx->nbits = 1024;
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rctx->pub_exp = NULL;
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rctx->pad_mode = RSA_PKCS1_PADDING;
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rctx->md = NULL;
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rctx->tbuf = NULL;
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rctx->saltlen = -2;
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ctx->data = rctx;
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ctx->keygen_info = rctx->gentmp;
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ctx->keygen_info_count = 2;
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return 1;
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}
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static int pkey_rsa_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
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{
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RSA_PKEY_CTX *dctx, *sctx;
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if (!pkey_rsa_init(dst))
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return 0;
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sctx = src->data;
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dctx = dst->data;
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dctx->nbits = sctx->nbits;
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if (sctx->pub_exp)
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{
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dctx->pub_exp = BN_dup(sctx->pub_exp);
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if (!dctx->pub_exp)
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return 0;
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}
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dctx->pad_mode = sctx->pad_mode;
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dctx->md = sctx->md;
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return 1;
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}
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static int setup_tbuf(RSA_PKEY_CTX *ctx, EVP_PKEY_CTX *pk)
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{
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if (ctx->tbuf)
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return 1;
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ctx->tbuf = OPENSSL_malloc(EVP_PKEY_size(pk->pkey));
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if (!ctx->tbuf)
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return 0;
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return 1;
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}
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static void pkey_rsa_cleanup(EVP_PKEY_CTX *ctx)
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{
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RSA_PKEY_CTX *rctx = ctx->data;
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if (rctx)
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{
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if (rctx->pub_exp)
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BN_free(rctx->pub_exp);
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if (rctx->tbuf)
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OPENSSL_free(rctx->tbuf);
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OPENSSL_free(rctx);
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}
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}
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static int pkey_rsa_sign(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
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const unsigned char *tbs, size_t tbslen)
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{
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int ret;
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RSA_PKEY_CTX *rctx = ctx->data;
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RSA *rsa = ctx->pkey->pkey.rsa;
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if (rctx->md)
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{
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if (tbslen != (size_t)EVP_MD_size(rctx->md))
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{
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RSAerr(RSA_F_PKEY_RSA_SIGN,
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RSA_R_INVALID_DIGEST_LENGTH);
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return -1;
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}
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if (rctx->pad_mode == RSA_X931_PADDING)
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{
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if (!setup_tbuf(rctx, ctx))
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return -1;
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memcpy(rctx->tbuf, tbs, tbslen);
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rctx->tbuf[tbslen] =
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RSA_X931_hash_id(EVP_MD_type(rctx->md));
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ret = RSA_private_encrypt(tbslen + 1, rctx->tbuf,
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sig, rsa, RSA_X931_PADDING);
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}
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else if (rctx->pad_mode == RSA_PKCS1_PADDING)
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{
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unsigned int sltmp;
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ret = RSA_sign(EVP_MD_type(rctx->md),
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tbs, tbslen, sig, &sltmp, rsa);
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if (ret <= 0)
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return ret;
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ret = sltmp;
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}
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else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING)
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{
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if (!setup_tbuf(rctx, ctx))
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return -1;
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if (!RSA_padding_add_PKCS1_PSS(rsa, rctx->tbuf, tbs,
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rctx->md, rctx->saltlen))
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return -1;
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ret = RSA_private_encrypt(RSA_size(rsa), rctx->tbuf,
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sig, rsa, RSA_NO_PADDING);
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}
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else
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return -1;
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}
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else
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ret = RSA_private_encrypt(tbslen, tbs, sig, ctx->pkey->pkey.rsa,
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rctx->pad_mode);
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if (ret < 0)
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return ret;
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*siglen = ret;
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return 1;
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}
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static int pkey_rsa_verifyrecover(EVP_PKEY_CTX *ctx,
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unsigned char *rout, size_t *routlen,
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const unsigned char *sig, size_t siglen)
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{
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int ret;
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RSA_PKEY_CTX *rctx = ctx->data;
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if (rctx->md)
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{
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if (rctx->pad_mode == RSA_X931_PADDING)
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{
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if (!setup_tbuf(rctx, ctx))
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return -1;
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ret = RSA_public_decrypt(siglen, sig,
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rctx->tbuf, ctx->pkey->pkey.rsa,
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RSA_X931_PADDING);
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if (ret < 1)
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return 0;
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ret--;
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if (rctx->tbuf[ret] !=
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RSA_X931_hash_id(EVP_MD_type(rctx->md)))
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{
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RSAerr(RSA_F_PKEY_RSA_VERIFYRECOVER,
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RSA_R_ALGORITHM_MISMATCH);
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return 0;
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}
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if (ret != EVP_MD_size(rctx->md))
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{
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RSAerr(RSA_F_PKEY_RSA_VERIFYRECOVER,
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RSA_R_INVALID_DIGEST_LENGTH);
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return 0;
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}
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if (rout)
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memcpy(rout, rctx->tbuf, ret);
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}
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else if (rctx->pad_mode == RSA_PKCS1_PADDING)
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{
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size_t sltmp;
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ret = int_rsa_verify(EVP_MD_type(rctx->md),
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NULL, 0, rout, &sltmp,
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sig, siglen, ctx->pkey->pkey.rsa);
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ret = sltmp;
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}
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else
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return -1;
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}
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else
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ret = RSA_public_decrypt(siglen, sig, rout, ctx->pkey->pkey.rsa,
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rctx->pad_mode);
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if (ret < 0)
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return ret;
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*routlen = ret;
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return 1;
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}
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static int pkey_rsa_verify(EVP_PKEY_CTX *ctx,
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const unsigned char *sig, size_t siglen,
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const unsigned char *tbs, size_t tbslen)
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{
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RSA_PKEY_CTX *rctx = ctx->data;
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RSA *rsa = ctx->pkey->pkey.rsa;
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size_t rslen;
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if (rctx->md)
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{
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if (rctx->pad_mode == RSA_PKCS1_PADDING)
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return RSA_verify(EVP_MD_type(rctx->md), tbs, tbslen,
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sig, siglen, rsa);
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if (rctx->pad_mode == RSA_X931_PADDING)
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{
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if (pkey_rsa_verifyrecover(ctx, NULL, &rslen,
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sig, siglen) <= 0)
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return 0;
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}
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else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING)
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{
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int ret;
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if (!setup_tbuf(rctx, ctx))
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return -1;
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ret = RSA_public_decrypt(siglen, sig, rctx->tbuf,
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rsa, RSA_NO_PADDING);
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if (ret <= 0)
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return 0;
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ret = RSA_verify_PKCS1_PSS(rsa, tbs, rctx->md,
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rctx->tbuf, rctx->saltlen);
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if (ret <= 0)
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return 0;
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return 1;
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}
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else
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return -1;
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}
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else
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{
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if (!setup_tbuf(rctx, ctx))
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return -1;
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rslen = RSA_public_decrypt(siglen, sig, rctx->tbuf,
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rsa, rctx->pad_mode);
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if (rslen == 0)
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return 0;
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}
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if ((rslen != tbslen) || memcmp(tbs, rctx->tbuf, rslen))
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return 0;
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return 1;
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}
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static int pkey_rsa_encrypt(EVP_PKEY_CTX *ctx,
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unsigned char *out, size_t *outlen,
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const unsigned char *in, size_t inlen)
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{
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int ret;
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RSA_PKEY_CTX *rctx = ctx->data;
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ret = RSA_public_encrypt(inlen, in, out, ctx->pkey->pkey.rsa,
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rctx->pad_mode);
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if (ret < 0)
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return ret;
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*outlen = ret;
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return 1;
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}
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static int pkey_rsa_decrypt(EVP_PKEY_CTX *ctx,
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unsigned char *out, size_t *outlen,
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const unsigned char *in, size_t inlen)
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{
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int ret;
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RSA_PKEY_CTX *rctx = ctx->data;
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ret = RSA_private_decrypt(inlen, in, out, ctx->pkey->pkey.rsa,
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rctx->pad_mode);
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if (ret < 0)
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return ret;
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*outlen = ret;
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return 1;
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}
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static int check_padding_md(const EVP_MD *md, int padding)
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{
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if (!md)
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return 1;
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if (padding == RSA_NO_PADDING)
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{
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RSAerr(RSA_F_CHECK_PADDING_MD, RSA_R_INVALID_PADDING_MODE);
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return 0;
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}
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if (padding == RSA_X931_PADDING)
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{
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if (RSA_X931_hash_id(EVP_MD_type(md)) == -1)
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{
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RSAerr(RSA_F_CHECK_PADDING_MD,
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RSA_R_INVALID_X931_DIGEST);
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return 0;
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}
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return 1;
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}
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return 1;
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}
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static int pkey_rsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
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{
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RSA_PKEY_CTX *rctx = ctx->data;
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switch (type)
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{
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case EVP_PKEY_CTRL_RSA_PADDING:
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if ((p1 >= RSA_PKCS1_PADDING) && (p1 <= RSA_PKCS1_PSS_PADDING))
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{
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if (!check_padding_md(rctx->md, p1))
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return 0;
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if (p1 == RSA_PKCS1_PSS_PADDING)
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{
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if (!(ctx->operation &
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(EVP_PKEY_OP_SIGN | EVP_PKEY_OP_VERIFY)))
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goto bad_pad;
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if (!rctx->md)
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rctx->md = EVP_sha1();
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}
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if (p1 == RSA_PKCS1_OAEP_PADDING)
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{
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if (!(ctx->operation & EVP_PKEY_OP_TYPE_CRYPT))
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goto bad_pad;
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if (!rctx->md)
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rctx->md = EVP_sha1();
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}
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rctx->pad_mode = p1;
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return 1;
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}
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bad_pad:
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RSAerr(RSA_F_PKEY_RSA_CTRL,
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RSA_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE);
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return -2;
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case EVP_PKEY_CTRL_RSA_PSS_SALTLEN:
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if (p1 < -2)
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return -2;
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if (rctx->pad_mode != RSA_PKCS1_PSS_PADDING)
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{
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RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PSS_SALTLEN);
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return -2;
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}
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rctx->saltlen = p1;
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return 1;
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case EVP_PKEY_CTRL_RSA_KEYGEN_BITS:
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if (p1 < 256)
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{
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RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_KEYBITS);
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return -2;
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}
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rctx->nbits = p1;
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return 1;
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case EVP_PKEY_CTRL_RSA_KEYGEN_PUBEXP:
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if (!p2)
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return -2;
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rctx->pub_exp = p2;
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return 1;
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case EVP_PKEY_CTRL_MD:
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if (!check_padding_md(p2, rctx->pad_mode))
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return 0;
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rctx->md = p2;
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return 1;
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case EVP_PKEY_CTRL_PKCS7_ENCRYPT:
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case EVP_PKEY_CTRL_PKCS7_DECRYPT:
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case EVP_PKEY_CTRL_PKCS7_SIGN:
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return 1;
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default:
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return -2;
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}
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}
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static int pkey_rsa_ctrl_str(EVP_PKEY_CTX *ctx,
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const char *type, const char *value)
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{
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if (!value)
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{
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RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_VALUE_MISSING);
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return 0;
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}
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if (!strcmp(type, "rsa_padding_mode"))
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{
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int pm;
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if (!strcmp(value, "pkcs1"))
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pm = RSA_PKCS1_PADDING;
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else if (!strcmp(value, "sslv23"))
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pm = RSA_SSLV23_PADDING;
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else if (!strcmp(value, "none"))
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pm = RSA_NO_PADDING;
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else if (!strcmp(value, "oeap"))
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pm = RSA_PKCS1_OAEP_PADDING;
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else if (!strcmp(value, "x931"))
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pm = RSA_X931_PADDING;
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else if (!strcmp(value, "pss"))
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pm = RSA_PKCS1_PSS_PADDING;
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else
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{
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RSAerr(RSA_F_PKEY_RSA_CTRL_STR,
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RSA_R_UNKNOWN_PADDING_TYPE);
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return -2;
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}
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return EVP_PKEY_CTX_set_rsa_padding(ctx, pm);
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}
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if (!strcmp(type, "rsa_pss_saltlen"))
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{
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int saltlen;
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saltlen = atoi(value);
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return EVP_PKEY_CTX_set_rsa_pss_saltlen(ctx, saltlen);
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}
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if (!strcmp(type, "rsa_keygen_bits"))
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{
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int nbits;
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nbits = atoi(value);
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return EVP_PKEY_CTX_set_rsa_keygen_bits(ctx, nbits);
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}
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if (!strcmp(type, "rsa_keygen_pubexp"))
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{
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int ret;
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BIGNUM *pubexp = NULL;
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if (!BN_asc2bn(&pubexp, value))
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return 0;
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ret = EVP_PKEY_CTX_set_rsa_keygen_pubexp(ctx, pubexp);
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if (ret <= 0)
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BN_free(pubexp);
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return ret;
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}
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return -2;
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}
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static int pkey_rsa_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
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{
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RSA *rsa = NULL;
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RSA_PKEY_CTX *rctx = ctx->data;
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BN_GENCB *pcb, cb;
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int ret;
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if (!rctx->pub_exp)
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{
|
|
rctx->pub_exp = BN_new();
|
|
if (!rctx->pub_exp || !BN_set_word(rctx->pub_exp, RSA_F4))
|
|
return 0;
|
|
}
|
|
rsa = RSA_new();
|
|
if (!rsa)
|
|
return 0;
|
|
if (ctx->pkey_gencb)
|
|
{
|
|
pcb = &cb;
|
|
evp_pkey_set_cb_translate(pcb, ctx);
|
|
}
|
|
else
|
|
pcb = NULL;
|
|
ret = RSA_generate_key_ex(rsa, rctx->nbits, rctx->pub_exp, pcb);
|
|
if (ret > 0)
|
|
EVP_PKEY_assign_RSA(pkey, rsa);
|
|
else
|
|
RSA_free(rsa);
|
|
return ret;
|
|
}
|
|
|
|
const EVP_PKEY_METHOD rsa_pkey_meth =
|
|
{
|
|
EVP_PKEY_RSA,
|
|
EVP_PKEY_FLAG_AUTOARGLEN,
|
|
pkey_rsa_init,
|
|
pkey_rsa_copy,
|
|
pkey_rsa_cleanup,
|
|
|
|
0,0,
|
|
|
|
0,
|
|
pkey_rsa_keygen,
|
|
|
|
0,
|
|
pkey_rsa_sign,
|
|
|
|
0,
|
|
pkey_rsa_verify,
|
|
|
|
0,
|
|
pkey_rsa_verifyrecover,
|
|
|
|
|
|
0,0,0,0,
|
|
|
|
0,
|
|
pkey_rsa_encrypt,
|
|
|
|
0,
|
|
pkey_rsa_decrypt,
|
|
|
|
0,0,
|
|
|
|
pkey_rsa_ctrl,
|
|
pkey_rsa_ctrl_str
|
|
|
|
|
|
};
|