Move RSA encryption functions to new file crypto/rsa/rsa_crpt.c to se…

…parate crypto and ENGINE dependencies in RSA library.
openssl · Jan 25, 2011 · c42d223 · c42d223
1 parent d5654d2
commit c42d223
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Showing 3 changed files with 227 additions and 159 deletions.
diff --git a/crypto/rsa/Makefile b/crypto/rsa/Makefile
@@ -20,11 +20,11 @@ LIB=$(TOP)/libcrypto.a
 LIBSRC= rsa_eay.c rsa_gen.c rsa_lib.c rsa_sign.c rsa_saos.c rsa_err.c \
 	rsa_pk1.c rsa_ssl.c rsa_none.c rsa_oaep.c rsa_chk.c rsa_null.c \
 	rsa_pss.c rsa_x931.c rsa_asn1.c rsa_depr.c rsa_ameth.c rsa_prn.c \
-	rsa_pmeth.c
+	rsa_pmeth.c rsa_crpt.c
 LIBOBJ= rsa_eay.o rsa_gen.o rsa_lib.o rsa_sign.o rsa_saos.o rsa_err.o \
 	rsa_pk1.o rsa_ssl.o rsa_none.o rsa_oaep.o rsa_chk.o rsa_null.o \
 	rsa_pss.o rsa_x931.o rsa_asn1.o rsa_depr.o rsa_ameth.o rsa_prn.o \
-	rsa_pmeth.o
+	rsa_pmeth.o rsa_crpt.o
 
 SRC= $(LIBSRC)
 

diff --git a/crypto/rsa/rsa_crpt.c b/crypto/rsa/rsa_crpt.c
@@ -0,0 +1,225 @@
+/* crypto/rsa/rsa_lib.c */
+/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
+ * All rights reserved.
+ *
+ * This package is an SSL implementation written
+ * by Eric Young (eay@cryptsoft.com).
+ * The implementation was written so as to conform with Netscapes SSL.
+ * 
+ * This library is free for commercial and non-commercial use as long as
+ * the following conditions are aheared to.  The following conditions
+ * apply to all code found in this distribution, be it the RC4, RSA,
+ * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
+ * included with this distribution is covered by the same copyright terms
+ * except that the holder is Tim Hudson (tjh@cryptsoft.com).
+ * 
+ * Copyright remains Eric Young's, and as such any Copyright notices in
+ * the code are not to be removed.
+ * If this package is used in a product, Eric Young should be given attribution
+ * as the author of the parts of the library used.
+ * This can be in the form of a textual message at program startup or
+ * in documentation (online or textual) provided with the package.
+ * 
+ * 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 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 acknowledgement:
+ *    "This product includes cryptographic software written by
+ *     Eric Young (eay@cryptsoft.com)"
+ *    The word 'cryptographic' can be left out if the rouines from the library
+ *    being used are not cryptographic related :-).
+ * 4. If you include any Windows specific code (or a derivative thereof) from 
+ *    the apps directory (application code) you must include an acknowledgement:
+ *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
+ * 
+ * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
+ * ANY EXPRESS 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 AUTHOR OR 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.
+ * 
+ * The licence and distribution terms for any publically available version or
+ * derivative of this code cannot be changed.  i.e. this code cannot simply be
+ * copied and put under another distribution licence
+ * [including the GNU Public Licence.]
+ */
+
+#include <stdio.h>
+#include <openssl/crypto.h>
+#include "cryptlib.h"
+#include <openssl/lhash.h>
+#include <openssl/bn.h>
+#include <openssl/rsa.h>
+#include <openssl/rand.h>
+#ifndef OPENSSL_NO_ENGINE
+#include <openssl/engine.h>
+#endif
+
+int RSA_size(const RSA *r)
+	{
+	return(BN_num_bytes(r->n));
+	}
+
+int RSA_public_encrypt(int flen, const unsigned char *from, unsigned char *to,
+	     RSA *rsa, int padding)
+	{
+	return(rsa->meth->rsa_pub_enc(flen, from, to, rsa, padding));
+	}
+
+int RSA_private_encrypt(int flen, const unsigned char *from, unsigned char *to,
+	     RSA *rsa, int padding)
+	{
+	return(rsa->meth->rsa_priv_enc(flen, from, to, rsa, padding));
+	}
+
+int RSA_private_decrypt(int flen, const unsigned char *from, unsigned char *to,
+	     RSA *rsa, int padding)
+	{
+	return(rsa->meth->rsa_priv_dec(flen, from, to, rsa, padding));
+	}
+
+int RSA_public_decrypt(int flen, const unsigned char *from, unsigned char *to,
+	     RSA *rsa, int padding)
+	{
+	return(rsa->meth->rsa_pub_dec(flen, from, to, rsa, padding));
+	}
+
+int RSA_flags(const RSA *r)
+	{
+	return((r == NULL)?0:r->meth->flags);
+	}
+
+void RSA_blinding_off(RSA *rsa)
+	{
+	if (rsa->blinding != NULL)
+		{
+		BN_BLINDING_free(rsa->blinding);
+		rsa->blinding=NULL;
+		}
+	rsa->flags &= ~RSA_FLAG_BLINDING;
+	rsa->flags |= RSA_FLAG_NO_BLINDING;
+	}
+
+int RSA_blinding_on(RSA *rsa, BN_CTX *ctx)
+	{
+	int ret=0;
+
+	if (rsa->blinding != NULL)
+		RSA_blinding_off(rsa);
+
+	rsa->blinding = RSA_setup_blinding(rsa, ctx);
+	if (rsa->blinding == NULL)
+		goto err;
+
+	rsa->flags |= RSA_FLAG_BLINDING;
+	rsa->flags &= ~RSA_FLAG_NO_BLINDING;
+	ret=1;
+err:
+	return(ret);
+	}
+
+static BIGNUM *rsa_get_public_exp(const BIGNUM *d, const BIGNUM *p,
+	const BIGNUM *q, BN_CTX *ctx)
+{
+	BIGNUM *ret = NULL, *r0, *r1, *r2;
+
+	if (d == NULL || p == NULL || q == NULL)
+		return NULL;
+
+	BN_CTX_start(ctx);
+	r0 = BN_CTX_get(ctx);
+	r1 = BN_CTX_get(ctx);
+	r2 = BN_CTX_get(ctx);
+	if (r2 == NULL)
+		goto err;
+
+	if (!BN_sub(r1, p, BN_value_one())) goto err;
+	if (!BN_sub(r2, q, BN_value_one())) goto err;
+	if (!BN_mul(r0, r1, r2, ctx)) goto err;
+
+	ret = BN_mod_inverse(NULL, d, r0, ctx);
+err:
+	BN_CTX_end(ctx);
+	return ret;
+}
+
+BN_BLINDING *RSA_setup_blinding(RSA *rsa, BN_CTX *in_ctx)
+{
+	BIGNUM local_n;
+	BIGNUM *e,*n;
+	BN_CTX *ctx;
+	BN_BLINDING *ret = NULL;
+
+	if (in_ctx == NULL)
+		{
+		if ((ctx = BN_CTX_new()) == NULL) return 0;
+		}
+	else
+		ctx = in_ctx;
+
+	BN_CTX_start(ctx);
+	e  = BN_CTX_get(ctx);
+	if (e == NULL)
+		{
+		RSAerr(RSA_F_RSA_SETUP_BLINDING, ERR_R_MALLOC_FAILURE);
+		goto err;
+		}
+
+	if (rsa->e == NULL)
+		{
+		e = rsa_get_public_exp(rsa->d, rsa->p, rsa->q, ctx);
+		if (e == NULL)
+			{
+			RSAerr(RSA_F_RSA_SETUP_BLINDING, RSA_R_NO_PUBLIC_EXPONENT);
+			goto err;
+			}
+		}
+	else
+		e = rsa->e;
+
+
+	if ((RAND_status() == 0) && rsa->d != NULL && rsa->d->d != NULL)
+		{
+		/* if PRNG is not properly seeded, resort to secret
+		 * exponent as unpredictable seed */
+		RAND_add(rsa->d->d, rsa->d->dmax * sizeof rsa->d->d[0], 0.0);
+		}
+
+	if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME))
+		{
+		/* Set BN_FLG_CONSTTIME flag */
+		n = &local_n;
+		BN_with_flags(n, rsa->n, BN_FLG_CONSTTIME);
+		}
+	else
+		n = rsa->n;
+
+	ret = BN_BLINDING_create_param(NULL, e, n, ctx,
+			rsa->meth->bn_mod_exp, rsa->_method_mod_n);
+	if (ret == NULL)
+		{
+		RSAerr(RSA_F_RSA_SETUP_BLINDING, ERR_R_BN_LIB);
+		goto err;
+		}
+	CRYPTO_THREADID_current(BN_BLINDING_thread_id(ret));
+err:
+	BN_CTX_end(ctx);
+	if (in_ctx == NULL)
+		BN_CTX_free(ctx);
+	if(rsa->e == NULL)
+		BN_free(e);
+
+	return ret;
+}