crypto/rsa/rsa_pmeth.c - third_party/openssl - Git at Google

 /* crypto/rsa/rsa_pmeth.c */
 /* 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 "cryptlib.h"
 #include <openssl/asn1t.h>
 #include <openssl/x509.h>
 #include <openssl/rsa.h>
 #include <openssl/bn.h>
 #include <openssl/evp.h>
 #include "evp_locl.h"
 #include "rsa_locl.h"

 /* RSA pkey context structure */

 typedef struct
 	{
 	/* Key gen parameters */
 	int nbits;
 	BIGNUM *pub_exp;
 	/* Keygen callback info */
 	int gentmp[2];
 	/* RSA padding mode */
 	int pad_mode;
 	/* message digest */
 	const EVP_MD *md;
 	/* PSS/OAEP salt length */
 	int saltlen;
 	/* Temp buffer */
 	unsigned char *tbuf;
 	} RSA_PKEY_CTX;

 static int pkey_rsa_init(EVP_PKEY_CTX *ctx)
 	{
 	RSA_PKEY_CTX *rctx;
 	rctx = OPENSSL_malloc(sizeof(RSA_PKEY_CTX));
 	if (!rctx)
 		return 0;
 	rctx->nbits = 1024;
 	rctx->pub_exp = NULL;
 	rctx->pad_mode = RSA_PKCS1_PADDING;
 	rctx->md = NULL;
 	rctx->tbuf = NULL;

 	rctx->saltlen = -2;

 	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)
 	{
 	RSA_PKEY_CTX *dctx, *sctx;
 	if (!pkey_rsa_init(dst))
 		return 0;
        	sctx = src->data;
 	dctx = dst->data;
 	dctx->nbits = sctx->nbits;
 	if (sctx->pub_exp)
 		{
 		dctx->pub_exp = BN_dup(sctx->pub_exp);
 		if (!dctx->pub_exp)
 			return 0;
 		}
 	dctx->pad_mode = sctx->pad_mode;
 	dctx->md = sctx->md;
 	return 1;
 	}

 static int setup_tbuf(RSA_PKEY_CTX *ctx, EVP_PKEY_CTX *pk)
 	{
 	if (ctx->tbuf)
 		return 1;
 	ctx->tbuf = OPENSSL_malloc(EVP_PKEY_size(pk->pkey));
 	if (!ctx->tbuf)
 		return 0;
 	return 1;
 	}

 static void pkey_rsa_cleanup(EVP_PKEY_CTX *ctx)
 	{
 	RSA_PKEY_CTX *rctx = ctx->data;
 	if (rctx)
 		{
 		if (rctx->pub_exp)
 			BN_free(rctx->pub_exp);
 		if (rctx->tbuf)
 			OPENSSL_free(rctx->tbuf);
 		OPENSSL_free(rctx);
 		}
 	}

 static int pkey_rsa_sign(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
 					const unsigned char *tbs, size_t tbslen)
 	{
 	int ret;
 	RSA_PKEY_CTX *rctx = ctx->data;
 	RSA *rsa = ctx->pkey->pkey.rsa;

 	if (rctx->md)
 		{
 		if (tbslen != (size_t)EVP_MD_size(rctx->md))
 			{
 			RSAerr(RSA_F_PKEY_RSA_SIGN,
 					RSA_R_INVALID_DIGEST_LENGTH);
 			return -1;
 			}
 		if (rctx->pad_mode == RSA_X931_PADDING)
 			{
 			if (!setup_tbuf(rctx, ctx))
 				return -1;
 			memcpy(rctx->tbuf, tbs, tbslen);
 			rctx->tbuf[tbslen] =
 				RSA_X931_hash_id(EVP_MD_type(rctx->md));
 			ret = RSA_private_encrypt(tbslen + 1, rctx->tbuf,
 						sig, rsa, RSA_X931_PADDING);
 			}
 		else if (rctx->pad_mode == RSA_PKCS1_PADDING)
 			{
 			unsigned int sltmp;
 			ret = RSA_sign(EVP_MD_type(rctx->md),
 						tbs, tbslen, sig, &sltmp, rsa);
 			if (ret <= 0)
 				return ret;
 			ret = sltmp;
 			}
 		else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING)
 			{
 			if (!setup_tbuf(rctx, ctx))
 				return -1;
 			if (!RSA_padding_add_PKCS1_PSS(rsa, rctx->tbuf, tbs,
 						rctx->md, rctx->saltlen))
 				return -1;
 			ret = RSA_private_encrypt(RSA_size(rsa), rctx->tbuf,
 						sig, rsa, RSA_NO_PADDING);
 			}
 		else
 			return -1;
 		}
 	else
 		ret = RSA_private_encrypt(tbslen, tbs, sig, ctx->pkey->pkey.rsa,
 							rctx->pad_mode);
 	if (ret < 0)
 		return ret;
 	*siglen = ret;
 	return 1;
 	}


 static int pkey_rsa_verifyrecover(EVP_PKEY_CTX *ctx,
 					unsigned char *rout, size_t *routlen,
 					const unsigned char *sig, size_t siglen)
 	{
 	int ret;
 	RSA_PKEY_CTX *rctx = ctx->data;

 	if (rctx->md)
 		{
 		if (rctx->pad_mode == RSA_X931_PADDING)
 			{
 			if (!setup_tbuf(rctx, ctx))
 				return -1;
 			ret = RSA_public_decrypt(siglen, sig,
 						rctx->tbuf, ctx->pkey->pkey.rsa,
 						RSA_X931_PADDING);
 			if (ret < 1)
 				return 0;
 			ret--;
 			if (rctx->tbuf[ret] !=
 				RSA_X931_hash_id(EVP_MD_type(rctx->md)))
 				{
 				RSAerr(RSA_F_PKEY_RSA_VERIFYRECOVER,
 						RSA_R_ALGORITHM_MISMATCH);
 				return 0;
 				}
 			if (ret != EVP_MD_size(rctx->md))
 				{
 				RSAerr(RSA_F_PKEY_RSA_VERIFYRECOVER,
 					RSA_R_INVALID_DIGEST_LENGTH);
 				return 0;
 				}
 			if (rout)
 				memcpy(rout, rctx->tbuf, ret);
 			}
 		else if (rctx->pad_mode == RSA_PKCS1_PADDING)
 			{
 			size_t sltmp;
 			ret = int_rsa_verify(EVP_MD_type(rctx->md),
 						NULL, 0, rout, &sltmp,
 					sig, siglen, ctx->pkey->pkey.rsa);
 			ret = sltmp;
 			}
 		else
 			return -1;
 		}
 	else
 		ret = RSA_public_decrypt(siglen, sig, rout, ctx->pkey->pkey.rsa,
 							rctx->pad_mode);
 	if (ret < 0)
 		return ret;
 	*routlen = ret;
 	return 1;
 	}

 static int pkey_rsa_verify(EVP_PKEY_CTX *ctx,
 					const unsigned char *sig, size_t siglen,
 					const unsigned char *tbs, size_t tbslen)
 	{
 	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,
 					sig, siglen, rsa);
 		if (rctx->pad_mode == RSA_X931_PADDING)
 			{
 			if (pkey_rsa_verifyrecover(ctx, NULL, &rslen,
 					sig, siglen) <= 0)
 				return 0;
 			}
 		else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING)
 			{
 			int ret;
 			if (!setup_tbuf(rctx, ctx))
 				return -1;
 			ret = RSA_public_decrypt(siglen, sig, rctx->tbuf,
 							rsa, RSA_NO_PADDING);
 			if (ret <= 0)
 				return 0;
 			ret = RSA_verify_PKCS1_PSS(rsa, tbs, rctx->md,
 						rctx->tbuf, rctx->saltlen);
 			if (ret <= 0)
 				return 0;
 			return 1;
 			}
 		else
 			return -1;
 		}
 	else
 		{
 		if (!setup_tbuf(rctx, ctx))
 			return -1;
 		rslen = RSA_public_decrypt(siglen, sig, rctx->tbuf,
 						rsa, rctx->pad_mode);
 		if (rslen == 0)
 			return 0;
 		}

 	if ((rslen != tbslen) || memcmp(tbs, rctx->tbuf, rslen))
 		return 0;

 	return 1;

 	}


 static int pkey_rsa_encrypt(EVP_PKEY_CTX *ctx,
 					unsigned char *out, size_t *outlen,
 					const unsigned char *in, size_t inlen)
 	{
 	int ret;
 	RSA_PKEY_CTX *rctx = ctx->data;
 	ret = RSA_public_encrypt(inlen, in, out, ctx->pkey->pkey.rsa,
 							rctx->pad_mode);
 	if (ret < 0)
 		return ret;
 	*outlen = ret;
 	return 1;
 	}

 static int pkey_rsa_decrypt(EVP_PKEY_CTX *ctx,
 					unsigned char *out, size_t *outlen,
 					const unsigned char *in, size_t inlen)
 	{
 	int ret;
 	RSA_PKEY_CTX *rctx = ctx->data;
 	ret = RSA_private_decrypt(inlen, in, out, ctx->pkey->pkey.rsa,
 							rctx->pad_mode);
 	if (ret < 0)
 		return ret;
 	*outlen = ret;
 	return 1;
 	}

 static int check_padding_md(const EVP_MD *md, int padding)
 	{
 	if (!md)
 		return 1;

 	if (padding == RSA_NO_PADDING)
 		{
 		RSAerr(RSA_F_CHECK_PADDING_MD, RSA_R_INVALID_PADDING_MODE);
 		return 0;
 		}

 	if (padding == RSA_X931_PADDING)
 		{
 		if (RSA_X931_hash_id(EVP_MD_type(md)) == -1)
 			{
 			RSAerr(RSA_F_CHECK_PADDING_MD,
 						RSA_R_INVALID_X931_DIGEST);
 			return 0;
 			}
 		return 1;
 		}

 	return 1;
 	}


 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))
 			{
 			if (!check_padding_md(rctx->md, p1))
 				return 0;
 			if (p1 == RSA_PKCS1_PSS_PADDING)
 				{
 				if (!(ctx->operation &
 				     (EVP_PKEY_OP_SIGN | EVP_PKEY_OP_VERIFY)))
 					goto bad_pad;
 				if (!rctx->md)
 					rctx->md = EVP_sha1();
 				}
 			if (p1 == RSA_PKCS1_OAEP_PADDING)
 				{
 				if (!(ctx->operation & EVP_PKEY_OP_TYPE_CRYPT))
 					goto bad_pad;
 				if (!rctx->md)
 					rctx->md = EVP_sha1();
 				}
 			rctx->pad_mode = p1;
 			return 1;
 			}
 		bad_pad:
 		RSAerr(RSA_F_PKEY_RSA_CTRL,
 				RSA_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE);
 		return -2;

 		case EVP_PKEY_CTRL_RSA_PSS_SALTLEN:
 		if (p1 < -2)
 			return -2;
 		if (rctx->pad_mode != RSA_PKCS1_PSS_PADDING)
 			{
 			RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PSS_SALTLEN);
 			return -2;
 			}
 		rctx->saltlen = p1;
 		return 1;

 		case EVP_PKEY_CTRL_RSA_KEYGEN_BITS:
 		if (p1 < 256)
 			{
 			RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_KEYBITS);
 			return -2;
 			}
 		rctx->nbits = p1;
 		return 1;

 		case EVP_PKEY_CTRL_RSA_KEYGEN_PUBEXP:
 		if (!p2)
 			return -2;
 		rctx->pub_exp = p2;
 		return 1;

 		case EVP_PKEY_CTRL_MD:
 		if (!check_padding_md(p2, rctx->pad_mode))
 			return 0;
 		rctx->md = p2;
 		return 1;

 		case EVP_PKEY_CTRL_DIGESTINIT:
 		case EVP_PKEY_CTRL_PKCS7_ENCRYPT:
 		case EVP_PKEY_CTRL_PKCS7_DECRYPT:
 		case EVP_PKEY_CTRL_PKCS7_SIGN:
 #ifndef OPENSSL_NO_CMS
 		case EVP_PKEY_CTRL_CMS_ENCRYPT:
 		case EVP_PKEY_CTRL_CMS_DECRYPT:
 		case EVP_PKEY_CTRL_CMS_SIGN:
 #endif
 		return 1;
 		case EVP_PKEY_CTRL_PEER_KEY:
 			RSAerr(RSA_F_PKEY_RSA_CTRL,
 			RSA_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 			return -2;

 		default:
 		return -2;

 		}
 	}

 static int pkey_rsa_ctrl_str(EVP_PKEY_CTX *ctx,
 			const char *type, const char *value)
 	{
 	if (!value)
 		{
 		RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_VALUE_MISSING);
 		return 0;
 		}
 	if (!strcmp(type, "rsa_padding_mode"))
 		{
 		int pm;
 		if (!strcmp(value, "pkcs1"))
 			pm = RSA_PKCS1_PADDING;
 		else if (!strcmp(value, "sslv23"))
 			pm = RSA_SSLV23_PADDING;
 		else if (!strcmp(value, "none"))
 			pm = RSA_NO_PADDING;
 		else if (!strcmp(value, "oeap"))
 			pm = RSA_PKCS1_OAEP_PADDING;
 		else if (!strcmp(value, "x931"))
 			pm = RSA_X931_PADDING;
 		else if (!strcmp(value, "pss"))
 			pm = RSA_PKCS1_PSS_PADDING;
 		else
 			{
 			RSAerr(RSA_F_PKEY_RSA_CTRL_STR,
 						RSA_R_UNKNOWN_PADDING_TYPE);
 			return -2;
 			}
 		return EVP_PKEY_CTX_set_rsa_padding(ctx, pm);
 		}

 	if (!strcmp(type, "rsa_pss_saltlen"))
 		{
 		int saltlen;
 		saltlen = atoi(value);
 		return EVP_PKEY_CTX_set_rsa_pss_saltlen(ctx, saltlen);
 		}

 	if (!strcmp(type, "rsa_keygen_bits"))
 		{
 		int nbits;
 		nbits = atoi(value);
 		return EVP_PKEY_CTX_set_rsa_keygen_bits(ctx, nbits);
 		}

 	if (!strcmp(type, "rsa_keygen_pubexp"))
 		{
 		int ret;
 		BIGNUM *pubexp = NULL;
 		if (!BN_asc2bn(&pubexp, value))
 			return 0;
 		ret = EVP_PKEY_CTX_set_rsa_keygen_pubexp(ctx, pubexp);
 		if (ret <= 0)
 			BN_free(pubexp);
 		return ret;
 		}

 	return -2;
 	}

 static int pkey_rsa_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
 	{
 	RSA *rsa = NULL;
 	RSA_PKEY_CTX *rctx = ctx->data;
 	BN_GENCB *pcb, cb;
 	int ret;
 	if (!rctx->pub_exp)
 		{
 		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


 	};
	/* crypto/rsa/rsa_pmeth.c */
	/* 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 "cryptlib.h"
	#include <openssl/asn1t.h>
	#include <openssl/x509.h>
	#include <openssl/rsa.h>
	#include <openssl/bn.h>
	#include <openssl/evp.h>
	#include "evp_locl.h"
	#include "rsa_locl.h"

	/* RSA pkey context structure */

	typedef struct
	{
	/* Key gen parameters */
	int nbits;
	BIGNUM *pub_exp;
	/* Keygen callback info */
	int gentmp[2];
	/* RSA padding mode */
	int pad_mode;
	/* message digest */
	const EVP_MD *md;
	/* PSS/OAEP salt length */
	int saltlen;
	/* Temp buffer */
	unsigned char *tbuf;
	} RSA_PKEY_CTX;

	static int pkey_rsa_init(EVP_PKEY_CTX *ctx)
	{
	RSA_PKEY_CTX *rctx;
	rctx = OPENSSL_malloc(sizeof(RSA_PKEY_CTX));
	if (!rctx)
	return 0;
	rctx->nbits = 1024;
	rctx->pub_exp = NULL;
	rctx->pad_mode = RSA_PKCS1_PADDING;
	rctx->md = NULL;
	rctx->tbuf = NULL;

	rctx->saltlen = -2;

	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)
	{
	RSA_PKEY_CTX dctx, sctx;
	if (!pkey_rsa_init(dst))
	return 0;
	sctx = src->data;
	dctx = dst->data;
	dctx->nbits = sctx->nbits;
	if (sctx->pub_exp)
	{
	dctx->pub_exp = BN_dup(sctx->pub_exp);
	if (!dctx->pub_exp)
	return 0;
	}
	dctx->pad_mode = sctx->pad_mode;
	dctx->md = sctx->md;
	return 1;
	}

	static int setup_tbuf(RSA_PKEY_CTX ctx, EVP_PKEY_CTX pk)
	{
	if (ctx->tbuf)
	return 1;
	ctx->tbuf = OPENSSL_malloc(EVP_PKEY_size(pk->pkey));
	if (!ctx->tbuf)
	return 0;
	return 1;
	}

	static void pkey_rsa_cleanup(EVP_PKEY_CTX *ctx)
	{
	RSA_PKEY_CTX *rctx = ctx->data;
	if (rctx)
	{
	if (rctx->pub_exp)
	BN_free(rctx->pub_exp);
	if (rctx->tbuf)
	OPENSSL_free(rctx->tbuf);
	OPENSSL_free(rctx);
	}
	}

	static int pkey_rsa_sign(EVP_PKEY_CTX ctx, unsigned char sig, size_t *siglen,
	const unsigned char *tbs, size_t tbslen)
	{
	int ret;
	RSA_PKEY_CTX *rctx = ctx->data;
	RSA *rsa = ctx->pkey->pkey.rsa;

	if (rctx->md)
	{
	if (tbslen != (size_t)EVP_MD_size(rctx->md))
	{
	RSAerr(RSA_F_PKEY_RSA_SIGN,
	RSA_R_INVALID_DIGEST_LENGTH);
	return -1;
	}
	if (rctx->pad_mode == RSA_X931_PADDING)
	{
	if (!setup_tbuf(rctx, ctx))
	return -1;
	memcpy(rctx->tbuf, tbs, tbslen);
	rctx->tbuf[tbslen] =
	RSA_X931_hash_id(EVP_MD_type(rctx->md));
	ret = RSA_private_encrypt(tbslen + 1, rctx->tbuf,
	sig, rsa, RSA_X931_PADDING);
	}
	else if (rctx->pad_mode == RSA_PKCS1_PADDING)
	{
	unsigned int sltmp;
	ret = RSA_sign(EVP_MD_type(rctx->md),
	tbs, tbslen, sig, &sltmp, rsa);
	if (ret <= 0)
	return ret;
	ret = sltmp;
	}
	else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING)
	{
	if (!setup_tbuf(rctx, ctx))
	return -1;
	if (!RSA_padding_add_PKCS1_PSS(rsa, rctx->tbuf, tbs,
	rctx->md, rctx->saltlen))
	return -1;
	ret = RSA_private_encrypt(RSA_size(rsa), rctx->tbuf,
	sig, rsa, RSA_NO_PADDING);
	}
	else
	return -1;
	}
	else
	ret = RSA_private_encrypt(tbslen, tbs, sig, ctx->pkey->pkey.rsa,
	rctx->pad_mode);
	if (ret < 0)
	return ret;
	*siglen = ret;
	return 1;
	}


	static int pkey_rsa_verifyrecover(EVP_PKEY_CTX *ctx,
	unsigned char rout, size_t routlen,
	const unsigned char *sig, size_t siglen)
	{
	int ret;
	RSA_PKEY_CTX *rctx = ctx->data;

	if (rctx->md)
	{
	if (rctx->pad_mode == RSA_X931_PADDING)
	{
	if (!setup_tbuf(rctx, ctx))
	return -1;
	ret = RSA_public_decrypt(siglen, sig,
	rctx->tbuf, ctx->pkey->pkey.rsa,
	RSA_X931_PADDING);
	if (ret < 1)
	return 0;
	ret--;
	if (rctx->tbuf[ret] !=
	RSA_X931_hash_id(EVP_MD_type(rctx->md)))
	{
	RSAerr(RSA_F_PKEY_RSA_VERIFYRECOVER,
	RSA_R_ALGORITHM_MISMATCH);
	return 0;
	}
	if (ret != EVP_MD_size(rctx->md))
	{
	RSAerr(RSA_F_PKEY_RSA_VERIFYRECOVER,
	RSA_R_INVALID_DIGEST_LENGTH);
	return 0;
	}
	if (rout)
	memcpy(rout, rctx->tbuf, ret);
	}
	else if (rctx->pad_mode == RSA_PKCS1_PADDING)
	{
	size_t sltmp;
	ret = int_rsa_verify(EVP_MD_type(rctx->md),
	NULL, 0, rout, &sltmp,
	sig, siglen, ctx->pkey->pkey.rsa);
	ret = sltmp;
	}
	else
	return -1;
	}
	else
	ret = RSA_public_decrypt(siglen, sig, rout, ctx->pkey->pkey.rsa,
	rctx->pad_mode);
	if (ret < 0)
	return ret;
	*routlen = ret;
	return 1;
	}

	static int pkey_rsa_verify(EVP_PKEY_CTX *ctx,
	const unsigned char *sig, size_t siglen,
	const unsigned char *tbs, size_t tbslen)
	{
	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,
	sig, siglen, rsa);
	if (rctx->pad_mode == RSA_X931_PADDING)
	{
	if (pkey_rsa_verifyrecover(ctx, NULL, &rslen,
	sig, siglen) <= 0)
	return 0;
	}
	else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING)
	{
	int ret;
	if (!setup_tbuf(rctx, ctx))
	return -1;
	ret = RSA_public_decrypt(siglen, sig, rctx->tbuf,
	rsa, RSA_NO_PADDING);
	if (ret <= 0)
	return 0;
	ret = RSA_verify_PKCS1_PSS(rsa, tbs, rctx->md,
	rctx->tbuf, rctx->saltlen);
	if (ret <= 0)
	return 0;
	return 1;
	}
	else
	return -1;
	}
	else
	{
	if (!setup_tbuf(rctx, ctx))
	return -1;
	rslen = RSA_public_decrypt(siglen, sig, rctx->tbuf,
	rsa, rctx->pad_mode);
	if (rslen == 0)
	return 0;
	}

	if ((rslen != tbslen) \|\| memcmp(tbs, rctx->tbuf, rslen))
	return 0;

	return 1;

	}


	static int pkey_rsa_encrypt(EVP_PKEY_CTX *ctx,
	unsigned char out, size_t outlen,
	const unsigned char *in, size_t inlen)
	{
	int ret;
	RSA_PKEY_CTX *rctx = ctx->data;
	ret = RSA_public_encrypt(inlen, in, out, ctx->pkey->pkey.rsa,
	rctx->pad_mode);
	if (ret < 0)
	return ret;
	*outlen = ret;
	return 1;
	}

	static int pkey_rsa_decrypt(EVP_PKEY_CTX *ctx,
	unsigned char out, size_t outlen,
	const unsigned char *in, size_t inlen)
	{
	int ret;
	RSA_PKEY_CTX *rctx = ctx->data;
	ret = RSA_private_decrypt(inlen, in, out, ctx->pkey->pkey.rsa,
	rctx->pad_mode);
	if (ret < 0)
	return ret;
	*outlen = ret;
	return 1;
	}

	static int check_padding_md(const EVP_MD *md, int padding)
	{
	if (!md)
	return 1;

	if (padding == RSA_NO_PADDING)
	{
	RSAerr(RSA_F_CHECK_PADDING_MD, RSA_R_INVALID_PADDING_MODE);
	return 0;
	}

	if (padding == RSA_X931_PADDING)
	{
	if (RSA_X931_hash_id(EVP_MD_type(md)) == -1)
	{
	RSAerr(RSA_F_CHECK_PADDING_MD,
	RSA_R_INVALID_X931_DIGEST);
	return 0;
	}
	return 1;
	}

	return 1;
	}


	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))
	{
	if (!check_padding_md(rctx->md, p1))
	return 0;
	if (p1 == RSA_PKCS1_PSS_PADDING)
	{
	if (!(ctx->operation &
	(EVP_PKEY_OP_SIGN \| EVP_PKEY_OP_VERIFY)))
	goto bad_pad;
	if (!rctx->md)
	rctx->md = EVP_sha1();
	}
	if (p1 == RSA_PKCS1_OAEP_PADDING)
	{
	if (!(ctx->operation & EVP_PKEY_OP_TYPE_CRYPT))
	goto bad_pad;
	if (!rctx->md)
	rctx->md = EVP_sha1();
	}
	rctx->pad_mode = p1;
	return 1;
	}
	bad_pad:
	RSAerr(RSA_F_PKEY_RSA_CTRL,
	RSA_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE);
	return -2;

	case EVP_PKEY_CTRL_RSA_PSS_SALTLEN:
	if (p1 < -2)
	return -2;
	if (rctx->pad_mode != RSA_PKCS1_PSS_PADDING)
	{
	RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PSS_SALTLEN);
	return -2;
	}
	rctx->saltlen = p1;
	return 1;

	case EVP_PKEY_CTRL_RSA_KEYGEN_BITS:
	if (p1 < 256)
	{
	RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_KEYBITS);
	return -2;
	}
	rctx->nbits = p1;
	return 1;

	case EVP_PKEY_CTRL_RSA_KEYGEN_PUBEXP:
	if (!p2)
	return -2;
	rctx->pub_exp = p2;
	return 1;

	case EVP_PKEY_CTRL_MD:
	if (!check_padding_md(p2, rctx->pad_mode))
	return 0;
	rctx->md = p2;
	return 1;

	case EVP_PKEY_CTRL_DIGESTINIT:
	case EVP_PKEY_CTRL_PKCS7_ENCRYPT:
	case EVP_PKEY_CTRL_PKCS7_DECRYPT:
	case EVP_PKEY_CTRL_PKCS7_SIGN:
	#ifndef OPENSSL_NO_CMS
	case EVP_PKEY_CTRL_CMS_ENCRYPT:
	case EVP_PKEY_CTRL_CMS_DECRYPT:
	case EVP_PKEY_CTRL_CMS_SIGN:
	#endif
	return 1;
	case EVP_PKEY_CTRL_PEER_KEY:
	RSAerr(RSA_F_PKEY_RSA_CTRL,
	RSA_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
	return -2;

	default:
	return -2;

	}
	}

	static int pkey_rsa_ctrl_str(EVP_PKEY_CTX *ctx,
	const char type, const char value)
	{
	if (!value)
	{
	RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_VALUE_MISSING);
	return 0;
	}
	if (!strcmp(type, "rsa_padding_mode"))
	{
	int pm;
	if (!strcmp(value, "pkcs1"))
	pm = RSA_PKCS1_PADDING;
	else if (!strcmp(value, "sslv23"))
	pm = RSA_SSLV23_PADDING;
	else if (!strcmp(value, "none"))
	pm = RSA_NO_PADDING;
	else if (!strcmp(value, "oeap"))
	pm = RSA_PKCS1_OAEP_PADDING;
	else if (!strcmp(value, "x931"))
	pm = RSA_X931_PADDING;
	else if (!strcmp(value, "pss"))
	pm = RSA_PKCS1_PSS_PADDING;
	else
	{
	RSAerr(RSA_F_PKEY_RSA_CTRL_STR,
	RSA_R_UNKNOWN_PADDING_TYPE);
	return -2;
	}
	return EVP_PKEY_CTX_set_rsa_padding(ctx, pm);
	}

	if (!strcmp(type, "rsa_pss_saltlen"))
	{
	int saltlen;
	saltlen = atoi(value);
	return EVP_PKEY_CTX_set_rsa_pss_saltlen(ctx, saltlen);
	}

	if (!strcmp(type, "rsa_keygen_bits"))
	{
	int nbits;
	nbits = atoi(value);
	return EVP_PKEY_CTX_set_rsa_keygen_bits(ctx, nbits);
	}

	if (!strcmp(type, "rsa_keygen_pubexp"))
	{
	int ret;
	BIGNUM *pubexp = NULL;
	if (!BN_asc2bn(&pubexp, value))
	return 0;
	ret = EVP_PKEY_CTX_set_rsa_keygen_pubexp(ctx, pubexp);
	if (ret <= 0)
	BN_free(pubexp);
	return ret;
	}

	return -2;
	}

	static int pkey_rsa_keygen(EVP_PKEY_CTX ctx, EVP_PKEY pkey)
	{
	RSA *rsa = NULL;
	RSA_PKEY_CTX *rctx = ctx->data;
	BN_GENCB *pcb, cb;
	int ret;
	if (!rctx->pub_exp)
	{
	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


	};