Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	lib/libcrypto/crypto/../../libssl/src/crypto/rsa/rsa_pmeth.c	Lines:	73	275	26.5 %
Date:	2016-12-06	Branches:	20	194	10.3 %


/* $OpenBSD: rsa_pmeth.c,v 1.17 2015/06/20 01:07:25 doug 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 <limits.h>
#include <stdio.h>
#include <string.h>

#include <openssl/opensslconf.h>

#include <openssl/asn1t.h>
#include <openssl/bn.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/rsa.h>
#include <openssl/x509.h>

#ifndef OPENSSL_NO_CMS
#include <openssl/cms.h>
#endif

#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;
	/* message digest for MGF1 */
	const EVP_MD *mgf1md;
	/* 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 = malloc(sizeof(RSA_PKEY_CTX));
	if (!rctx)
		return 0;
	rctx->nbits = 2048;
	rctx->pub_exp = NULL;
	rctx->pad_mode = RSA_PKCS1_PADDING;
	rctx->md = NULL;
	rctx->mgf1md = 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 = 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) {
		BN_free(rctx->pub_exp);
		free(rctx->tbuf);
		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_mgf1(rsa, rctx->tbuf,
			    tbs, rctx->md, rctx->mgf1md, 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);
			if (ret <= 0)
				return 0;
			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_mgf1(rsa, tbs, rctx->md,
			    rctx->mgf1md, 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_GET_RSA_PADDING:
		*(int *)p2 = rctx->pad_mode;
		return 1;

	case EVP_PKEY_CTRL_RSA_PSS_SALTLEN:
	case EVP_PKEY_CTRL_GET_RSA_PSS_SALTLEN:
		if (rctx->pad_mode != RSA_PKCS1_PSS_PADDING) {
			RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PSS_SALTLEN);
			return -2;
		}
		if (type == EVP_PKEY_CTRL_GET_RSA_PSS_SALTLEN)
			*(int *)p2 = rctx->saltlen;
		else {
			if (p1 < -2)
				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_RSA_MGF1_MD:
	case EVP_PKEY_CTRL_GET_RSA_MGF1_MD:
		if (rctx->pad_mode != RSA_PKCS1_PSS_PADDING) {
			RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_MGF1_MD);
			return -2;
		}
		if (type == EVP_PKEY_CTRL_GET_RSA_MGF1_MD) {
			if (rctx->mgf1md)
				*(const EVP_MD **)p2 = rctx->mgf1md;
			else
				*(const EVP_MD **)p2 = rctx->md;
		} else
			rctx->mgf1md = 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:
		return 1;
#ifndef OPENSSL_NO_CMS
	case EVP_PKEY_CTRL_CMS_DECRYPT:
		{
			X509_ALGOR *alg = NULL;
			ASN1_OBJECT *encalg = NULL;

			if (p2)
				CMS_RecipientInfo_ktri_get0_algs(p2, NULL,
				    NULL, &alg);
			if (alg)
				X509_ALGOR_get0(&encalg, NULL, NULL, alg);
			if (encalg && OBJ_obj2nid(encalg) == NID_rsaesOaep)
				rctx->pad_mode = RSA_PKCS1_OAEP_PADDING;
		}
		/* FALLTHROUGH */

	case EVP_PKEY_CTRL_CMS_ENCRYPT:
	case EVP_PKEY_CTRL_CMS_SIGN:
		return 1;
#endif
	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)
{
	long lval;
	char *ep;

	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, "oaep"))
			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;

		errno = 0;
		lval = strtol(value, &ep, 10);
		if (value[0] == '\0' || *ep != '\0')
			goto not_a_number;
		if ((errno == ERANGE &&
		    (lval == LONG_MAX || lval == LONG_MIN)) ||
		    (lval > INT_MAX || lval < INT_MIN))
			goto out_of_range;
		saltlen = lval;
		return EVP_PKEY_CTX_set_rsa_pss_saltlen(ctx, saltlen);
	}

	if (!strcmp(type, "rsa_keygen_bits")) {
		int nbits;

		errno = 0;
		lval = strtol(value, &ep, 10);
		if (value[0] == '\0' || *ep != '\0')
			goto not_a_number;
		if ((errno == ERANGE &&
		    (lval == LONG_MAX || lval == LONG_MIN)) ||
		    (lval > INT_MAX || lval < INT_MIN))
			goto out_of_range;
		nbits = lval;
		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;
	}

not_a_number:
out_of_range:
	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 = {
	.pkey_id = EVP_PKEY_RSA,
	.flags = EVP_PKEY_FLAG_AUTOARGLEN,

	.init = pkey_rsa_init,
	.copy = pkey_rsa_copy,
	.cleanup = pkey_rsa_cleanup,

	.keygen = pkey_rsa_keygen,

	.sign = pkey_rsa_sign,

	.verify = pkey_rsa_verify,

	.verify_recover = pkey_rsa_verifyrecover,

	.encrypt = pkey_rsa_encrypt,

	.decrypt = pkey_rsa_decrypt,

	.ctrl = pkey_rsa_ctrl,
	.ctrl_str = pkey_rsa_ctrl_str
};


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: rsa_pmeth.c,v 1.17 2015/06/20 01:07:25 doug Exp $ */
2			/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
3			* project 2006.
4			*/
5			/* ====================================================================
6			* Copyright (c) 2006 The OpenSSL Project. All rights reserved.
7			*
8			* Redistribution and use in source and binary forms, with or without
9			* modification, are permitted provided that the following conditions
10			* are met:
11			*
12			* 1. Redistributions of source code must retain the above copyright
13			* notice, this list of conditions and the following disclaimer.
14			*
15			* 2. Redistributions in binary form must reproduce the above copyright
16			* notice, this list of conditions and the following disclaimer in
17			* the documentation and/or other materials provided with the
18			* distribution.
19			*
20			* 3. All advertising materials mentioning features or use of this
21			* software must display the following acknowledgment:
22			* "This product includes software developed by the OpenSSL Project
23			* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
24			*
25			* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26			* endorse or promote products derived from this software without
27			* prior written permission. For written permission, please contact
28			* licensing@OpenSSL.org.
29			*
30			* 5. Products derived from this software may not be called "OpenSSL"
31			* nor may "OpenSSL" appear in their names without prior written
32			* permission of the OpenSSL Project.
33			*
34			* 6. Redistributions of any form whatsoever must retain the following
35			* acknowledgment:
36			* "This product includes software developed by the OpenSSL Project
37			* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38			*
39			* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40			* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41			* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42			* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
43			* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44			* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45			* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46			* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47			* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48			* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49			* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50			* OF THE POSSIBILITY OF SUCH DAMAGE.
51			* ====================================================================
52			*
53			* This product includes cryptographic software written by Eric Young
54			* (eay@cryptsoft.com). This product includes software written by Tim
55			* Hudson (tjh@cryptsoft.com).
56			*
57			*/
58
59			#include <limits.h>
60			#include <stdio.h>
61			#include <string.h>
62
63			#include <openssl/opensslconf.h>
64
65			#include <openssl/asn1t.h>
66			#include <openssl/bn.h>
67			#include <openssl/err.h>
68			#include <openssl/evp.h>
69			#include <openssl/rsa.h>
70			#include <openssl/x509.h>
71
72			#ifndef OPENSSL_NO_CMS
73			#include <openssl/cms.h>
74			#endif
75
76			#include "evp_locl.h"
77			#include "rsa_locl.h"
78
79			/* RSA pkey context structure */
80
81			typedef struct {
82			/* Key gen parameters */
83			int nbits;
84			BIGNUM *pub_exp;
85			/* Keygen callback info */
86			int gentmp[2];
87			/* RSA padding mode */
88			int pad_mode;
89			/* message digest */
90			const EVP_MD *md;
91			/* message digest for MGF1 */
92			const EVP_MD *mgf1md;
93			/* PSS/OAEP salt length */
94			int saltlen;
95			/* Temp buffer */
96			unsigned char *tbuf;
97			} RSA_PKEY_CTX;
98
99			static int
100			pkey_rsa_init(EVP_PKEY_CTX *ctx)
101		19	{
102			RSA_PKEY_CTX *rctx;
103
104		19	rctx = malloc(sizeof(RSA_PKEY_CTX));
105	✗✓	19	if (!rctx)
106			return 0;
107		19	rctx->nbits = 2048;
108		19	rctx->pub_exp = NULL;
109		19	rctx->pad_mode = RSA_PKCS1_PADDING;
110		19	rctx->md = NULL;
111		19	rctx->mgf1md = NULL;
112		19	rctx->tbuf = NULL;
113
114		19	rctx->saltlen = -2;
115
116		19	ctx->data = rctx;
117		19	ctx->keygen_info = rctx->gentmp;
118		19	ctx->keygen_info_count = 2;
119
120		19	return 1;
121			}
122
123			static int
124			pkey_rsa_copy(EVP_PKEY_CTX dst, EVP_PKEY_CTX src)
125		7	{
126			RSA_PKEY_CTX dctx, sctx;
127
128	✗✓	7	if (!pkey_rsa_init(dst))
129			return 0;
130		7	sctx = src->data;
131		7	dctx = dst->data;
132		7	dctx->nbits = sctx->nbits;
133	✗✓	7	if (sctx->pub_exp) {
134			dctx->pub_exp = BN_dup(sctx->pub_exp);
135			if (!dctx->pub_exp)
136			return 0;
137			}
138		7	dctx->pad_mode = sctx->pad_mode;
139		7	dctx->md = sctx->md;
140		7	return 1;
141			}
142
143			static int
144			setup_tbuf(RSA_PKEY_CTX ctx, EVP_PKEY_CTX pk)
145			{
146			if (ctx->tbuf)
147			return 1;
148			ctx->tbuf = malloc(EVP_PKEY_size(pk->pkey));
149			if (!ctx->tbuf)
150			return 0;
151			return 1;
152			}
153
154			static void
155			pkey_rsa_cleanup(EVP_PKEY_CTX *ctx)
156		19	{
157		19	RSA_PKEY_CTX *rctx = ctx->data;
158
159	✓✗	19	if (rctx) {
160		19	BN_free(rctx->pub_exp);
161		19	free(rctx->tbuf);
162		19	free(rctx);
163			}
164		19	}
165
166			static int
167			pkey_rsa_sign(EVP_PKEY_CTX ctx, unsigned char sig, size_t *siglen,
168			const unsigned char *tbs, size_t tbslen)
169		2	{
170			int ret;
171		2	RSA_PKEY_CTX *rctx = ctx->data;
172		2	RSA *rsa = ctx->pkey->pkey.rsa;
173
174	✓✗	2	if (rctx->md) {
175	✗✓	2	if (tbslen != (size_t)EVP_MD_size(rctx->md)) {
176			RSAerr(RSA_F_PKEY_RSA_SIGN,
177			RSA_R_INVALID_DIGEST_LENGTH);
178			return -1;
179			}
180
181	✗✓	2	if (rctx->pad_mode == RSA_X931_PADDING) {
182			if (!setup_tbuf(rctx, ctx))
183			return -1;
184			memcpy(rctx->tbuf, tbs, tbslen);
185			rctx->tbuf[tbslen] =
186			RSA_X931_hash_id(EVP_MD_type(rctx->md));
187			ret = RSA_private_encrypt(tbslen + 1, rctx->tbuf, sig,
188			rsa, RSA_X931_PADDING);
189	✓✗	2	} else if (rctx->pad_mode == RSA_PKCS1_PADDING) {
190			unsigned int sltmp;
191
192		2	ret = RSA_sign(EVP_MD_type(rctx->md), tbs, tbslen, sig,
193			&sltmp, rsa);
194	✗✓	2	if (ret <= 0)
195			return ret;
196		2	ret = sltmp;
197			} else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING) {
198			if (!setup_tbuf(rctx, ctx))
199			return -1;
200			if (!RSA_padding_add_PKCS1_PSS_mgf1(rsa, rctx->tbuf,
201			tbs, rctx->md, rctx->mgf1md, rctx->saltlen))
202			return -1;
203			ret = RSA_private_encrypt(RSA_size(rsa), rctx->tbuf,
204			sig, rsa, RSA_NO_PADDING);
205			} else
206			return -1;
207			} else
208			ret = RSA_private_encrypt(tbslen, tbs, sig, ctx->pkey->pkey.rsa,
209			rctx->pad_mode);
210	✗✓	2	if (ret < 0)
211			return ret;
212		2	*siglen = ret;
213		2	return 1;
214			}
215
216			static int
217			pkey_rsa_verifyrecover(EVP_PKEY_CTX ctx, unsigned char rout, size_t *routlen,
218			const unsigned char *sig, size_t siglen)
219			{
220			int ret;
221			RSA_PKEY_CTX *rctx = ctx->data;
222
223			if (rctx->md) {
224			if (rctx->pad_mode == RSA_X931_PADDING) {
225			if (!setup_tbuf(rctx, ctx))
226			return -1;
227			ret = RSA_public_decrypt(siglen, sig, rctx->tbuf,
228			ctx->pkey->pkey.rsa, RSA_X931_PADDING);
229			if (ret < 1)
230			return 0;
231			ret--;
232			if (rctx->tbuf[ret] !=
233			RSA_X931_hash_id(EVP_MD_type(rctx->md))) {
234			RSAerr(RSA_F_PKEY_RSA_VERIFYRECOVER,
235			RSA_R_ALGORITHM_MISMATCH);
236			return 0;
237			}
238			if (ret != EVP_MD_size(rctx->md)) {
239			RSAerr(RSA_F_PKEY_RSA_VERIFYRECOVER,
240			RSA_R_INVALID_DIGEST_LENGTH);
241			return 0;
242			}
243			if (rout)
244			memcpy(rout, rctx->tbuf, ret);
245			} else if (rctx->pad_mode == RSA_PKCS1_PADDING) {
246			size_t sltmp;
247
248			ret = int_rsa_verify(EVP_MD_type(rctx->md), NULL, 0,
249			rout, &sltmp, sig, siglen, ctx->pkey->pkey.rsa);
250			if (ret <= 0)
251			return 0;
252			ret = sltmp;
253			} else
254			return -1;
255			} else
256			ret = RSA_public_decrypt(siglen, sig, rout, ctx->pkey->pkey.rsa,
257			rctx->pad_mode);
258			if (ret < 0)
259			return ret;
260			*routlen = ret;
261			return 1;
262			}
263
264			static int
265			pkey_rsa_verify(EVP_PKEY_CTX ctx, const unsigned char sig, size_t siglen,
266			const unsigned char *tbs, size_t tbslen)
267		8	{
268		8	RSA_PKEY_CTX *rctx = ctx->data;
269		8	RSA *rsa = ctx->pkey->pkey.rsa;
270			size_t rslen;
271
272	✓✗	8	if (rctx->md) {
273	✓✗	8	if (rctx->pad_mode == RSA_PKCS1_PADDING)
274		8	return RSA_verify(EVP_MD_type(rctx->md), tbs, tbslen,
275			sig, siglen, rsa);
276			if (rctx->pad_mode == RSA_X931_PADDING) {
277			if (pkey_rsa_verifyrecover(ctx, NULL, &rslen, sig,
278			siglen) <= 0)
279			return 0;
280			} else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING) {
281			int ret;
282
283			if (!setup_tbuf(rctx, ctx))
284			return -1;
285			ret = RSA_public_decrypt(siglen, sig, rctx->tbuf,
286			rsa, RSA_NO_PADDING);
287			if (ret <= 0)
288			return 0;
289			ret = RSA_verify_PKCS1_PSS_mgf1(rsa, tbs, rctx->md,
290			rctx->mgf1md, rctx->tbuf, rctx->saltlen);
291			if (ret <= 0)
292			return 0;
293			return 1;
294			} else
295			return -1;
296			} else {
297			if (!setup_tbuf(rctx, ctx))
298			return -1;
299			rslen = RSA_public_decrypt(siglen, sig, rctx->tbuf, rsa,
300			rctx->pad_mode);
301			if (rslen == 0)
302			return 0;
303			}
304
305			if (rslen != tbslen \|\| memcmp(tbs, rctx->tbuf, rslen))
306			return 0;
307
308			return 1;
309			}
310
311			static int
312			pkey_rsa_encrypt(EVP_PKEY_CTX ctx, unsigned char out, size_t *outlen,
313			const unsigned char *in, size_t inlen)
314		1	{
315			int ret;
316		1	RSA_PKEY_CTX *rctx = ctx->data;
317
318		1	ret = RSA_public_encrypt(inlen, in, out, ctx->pkey->pkey.rsa,
319			rctx->pad_mode);
320	✗✓	1	if (ret < 0)
321			return ret;
322		1	*outlen = ret;
323		1	return 1;
324			}
325
326			static int
327			pkey_rsa_decrypt(EVP_PKEY_CTX ctx, unsigned char out, size_t *outlen,
328			const unsigned char *in, size_t inlen)
329		1	{
330			int ret;
331		1	RSA_PKEY_CTX *rctx = ctx->data;
332
333		1	ret = RSA_private_decrypt(inlen, in, out, ctx->pkey->pkey.rsa,
334			rctx->pad_mode);
335	✗✓	1	if (ret < 0)
336			return ret;
337		1	*outlen = ret;
338		1	return 1;
339			}
340
341			static int
342			check_padding_md(const EVP_MD *md, int padding)
343		10	{
344	✗✓	10	if (!md)
345			return 1;
346
347	✗✓	10	if (padding == RSA_NO_PADDING) {
348			RSAerr(RSA_F_CHECK_PADDING_MD, RSA_R_INVALID_PADDING_MODE);
349			return 0;
350			}
351
352	✗✓	10	if (padding == RSA_X931_PADDING) {
353			if (RSA_X931_hash_id(EVP_MD_type(md)) == -1) {
354			RSAerr(RSA_F_CHECK_PADDING_MD,
355			RSA_R_INVALID_X931_DIGEST);
356			return 0;
357			}
358			return 1;
359			}
360
361		10	return 1;
362			}
363
364			static int
365			pkey_rsa_ctrl(EVP_PKEY_CTX ctx, int type, int p1, void p2)
366		23	{
367		23	RSA_PKEY_CTX *rctx = ctx->data;
368
369	✗✗✗✗ ✗✓✗✓ ✗✗	23	switch (type) {
370			case EVP_PKEY_CTRL_RSA_PADDING:
371			if (p1 >= RSA_PKCS1_PADDING && p1 <= RSA_PKCS1_PSS_PADDING) {
372			if (!check_padding_md(rctx->md, p1))
373			return 0;
374			if (p1 == RSA_PKCS1_PSS_PADDING) {
375			if (!(ctx->operation &
376			(EVP_PKEY_OP_SIGN \| EVP_PKEY_OP_VERIFY)))
377			goto bad_pad;
378			if (!rctx->md)
379			rctx->md = EVP_sha1();
380			}
381			if (p1 == RSA_PKCS1_OAEP_PADDING) {
382			if (!(ctx->operation & EVP_PKEY_OP_TYPE_CRYPT))
383			goto bad_pad;
384			if (!rctx->md)
385			rctx->md = EVP_sha1();
386			}
387			rctx->pad_mode = p1;
388			return 1;
389			}
390			bad_pad:
391			RSAerr(RSA_F_PKEY_RSA_CTRL,
392			RSA_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE);
393			return -2;
394
395			case EVP_PKEY_CTRL_GET_RSA_PADDING:
396			(int )p2 = rctx->pad_mode;
397			return 1;
398
399			case EVP_PKEY_CTRL_RSA_PSS_SALTLEN:
400			case EVP_PKEY_CTRL_GET_RSA_PSS_SALTLEN:
401			if (rctx->pad_mode != RSA_PKCS1_PSS_PADDING) {
402			RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PSS_SALTLEN);
403			return -2;
404			}
405			if (type == EVP_PKEY_CTRL_GET_RSA_PSS_SALTLEN)
406			(int )p2 = rctx->saltlen;
407			else {
408			if (p1 < -2)
409			return -2;
410			rctx->saltlen = p1;
411			}
412			return 1;
413
414			case EVP_PKEY_CTRL_RSA_KEYGEN_BITS:
415			if (p1 < 256) {
416			RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_KEYBITS);
417			return -2;
418			}
419			rctx->nbits = p1;
420			return 1;
421
422			case EVP_PKEY_CTRL_RSA_KEYGEN_PUBEXP:
423			if (!p2)
424			return -2;
425			rctx->pub_exp = p2;
426			return 1;
427
428			case EVP_PKEY_CTRL_MD:
429	✗✓	10	if (!check_padding_md(p2, rctx->pad_mode))
430			return 0;
431		10	rctx->md = p2;
432		10	return 1;
433
434			case EVP_PKEY_CTRL_RSA_MGF1_MD:
435			case EVP_PKEY_CTRL_GET_RSA_MGF1_MD:
436			if (rctx->pad_mode != RSA_PKCS1_PSS_PADDING) {
437			RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_MGF1_MD);
438			return -2;
439			}
440			if (type == EVP_PKEY_CTRL_GET_RSA_MGF1_MD) {
441			if (rctx->mgf1md)
442			(const EVP_MD *)p2 = rctx->mgf1md;
443			else
444			(const EVP_MD *)p2 = rctx->md;
445			} else
446			rctx->mgf1md = p2;
447			return 1;
448
449			case EVP_PKEY_CTRL_DIGESTINIT:
450			case EVP_PKEY_CTRL_PKCS7_ENCRYPT:
451			case EVP_PKEY_CTRL_PKCS7_DECRYPT:
452			case EVP_PKEY_CTRL_PKCS7_SIGN:
453		13	return 1;
454			#ifndef OPENSSL_NO_CMS
455			case EVP_PKEY_CTRL_CMS_DECRYPT:
456			{
457			X509_ALGOR *alg = NULL;
458			ASN1_OBJECT *encalg = NULL;
459
460			if (p2)
461			CMS_RecipientInfo_ktri_get0_algs(p2, NULL,
462			NULL, &alg);
463			if (alg)
464			X509_ALGOR_get0(&encalg, NULL, NULL, alg);
465			if (encalg && OBJ_obj2nid(encalg) == NID_rsaesOaep)
466			rctx->pad_mode = RSA_PKCS1_OAEP_PADDING;
467			}
468			/* FALLTHROUGH */
469
470			case EVP_PKEY_CTRL_CMS_ENCRYPT:
471			case EVP_PKEY_CTRL_CMS_SIGN:
472			return 1;
473			#endif
474			case EVP_PKEY_CTRL_PEER_KEY:
475			RSAerr(RSA_F_PKEY_RSA_CTRL,
476			RSA_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
477			return -2;
478
479			default:
480			return -2;
481			}
482			}
483
484			static int
485			pkey_rsa_ctrl_str(EVP_PKEY_CTX ctx, const char type, const char *value)
486			{
487			long lval;
488			char *ep;
489
490			if (!value) {
491			RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_VALUE_MISSING);
492			return 0;
493			}
494			if (!strcmp(type, "rsa_padding_mode")) {
495			int pm;
496			if (!strcmp(value, "pkcs1"))
497			pm = RSA_PKCS1_PADDING;
498			else if (!strcmp(value, "sslv23"))
499			pm = RSA_SSLV23_PADDING;
500			else if (!strcmp(value, "none"))
501			pm = RSA_NO_PADDING;
502			else if (!strcmp(value, "oeap"))
503			pm = RSA_PKCS1_OAEP_PADDING;
504			else if (!strcmp(value, "oaep"))
505			pm = RSA_PKCS1_OAEP_PADDING;
506			else if (!strcmp(value, "x931"))
507			pm = RSA_X931_PADDING;
508			else if (!strcmp(value, "pss"))
509			pm = RSA_PKCS1_PSS_PADDING;
510			else {
511			RSAerr(RSA_F_PKEY_RSA_CTRL_STR,
512			RSA_R_UNKNOWN_PADDING_TYPE);
513			return -2;
514			}
515			return EVP_PKEY_CTX_set_rsa_padding(ctx, pm);
516			}
517
518			if (!strcmp(type, "rsa_pss_saltlen")) {
519			int saltlen;
520
521			errno = 0;
522			lval = strtol(value, &ep, 10);
523			if (value[0] == '\0' \|\| *ep != '\0')
524			goto not_a_number;
525			if ((errno == ERANGE &&
526			(lval == LONG_MAX \|\| lval == LONG_MIN)) \|\|
527			(lval > INT_MAX \|\| lval < INT_MIN))
528			goto out_of_range;
529			saltlen = lval;
530			return EVP_PKEY_CTX_set_rsa_pss_saltlen(ctx, saltlen);
531			}
532
533			if (!strcmp(type, "rsa_keygen_bits")) {
534			int nbits;
535
536			errno = 0;
537			lval = strtol(value, &ep, 10);
538			if (value[0] == '\0' \|\| *ep != '\0')
539			goto not_a_number;
540			if ((errno == ERANGE &&
541			(lval == LONG_MAX \|\| lval == LONG_MIN)) \|\|
542			(lval > INT_MAX \|\| lval < INT_MIN))
543			goto out_of_range;
544			nbits = lval;
545			return EVP_PKEY_CTX_set_rsa_keygen_bits(ctx, nbits);
546			}
547
548			if (!strcmp(type, "rsa_keygen_pubexp")) {
549			int ret;
550			BIGNUM *pubexp = NULL;
551
552			if (!BN_asc2bn(&pubexp, value))
553			return 0;
554			ret = EVP_PKEY_CTX_set_rsa_keygen_pubexp(ctx, pubexp);
555			if (ret <= 0)
556			BN_free(pubexp);
557			return ret;
558			}
559
560			not_a_number:
561			out_of_range:
562			return -2;
563			}
564
565			static int
566			pkey_rsa_keygen(EVP_PKEY_CTX ctx, EVP_PKEY pkey)
567			{
568			RSA *rsa = NULL;
569			RSA_PKEY_CTX *rctx = ctx->data;
570			BN_GENCB *pcb, cb;
571			int ret;
572
573			if (!rctx->pub_exp) {
574			rctx->pub_exp = BN_new();
575			if (!rctx->pub_exp \|\| !BN_set_word(rctx->pub_exp, RSA_F4))
576			return 0;
577			}
578			rsa = RSA_new();
579			if (!rsa)
580			return 0;
581			if (ctx->pkey_gencb) {
582			pcb = &cb;
583			evp_pkey_set_cb_translate(pcb, ctx);
584			} else
585			pcb = NULL;
586			ret = RSA_generate_key_ex(rsa, rctx->nbits, rctx->pub_exp, pcb);
587			if (ret > 0)
588			EVP_PKEY_assign_RSA(pkey, rsa);
589			else
590			RSA_free(rsa);
591			return ret;
592			}
593
594			const EVP_PKEY_METHOD rsa_pkey_meth = {
595			.pkey_id = EVP_PKEY_RSA,
596			.flags = EVP_PKEY_FLAG_AUTOARGLEN,
597
598			.init = pkey_rsa_init,
599			.copy = pkey_rsa_copy,
600			.cleanup = pkey_rsa_cleanup,
601
602			.keygen = pkey_rsa_keygen,
603
604			.sign = pkey_rsa_sign,
605
606			.verify = pkey_rsa_verify,
607
608			.verify_recover = pkey_rsa_verifyrecover,
609
610			.encrypt = pkey_rsa_encrypt,
611
612			.decrypt = pkey_rsa_decrypt,
613
614			.ctrl = pkey_rsa_ctrl,
615			.ctrl_str = pkey_rsa_ctrl_str
616			};