Initial experimental CMAC implementation.

CHANGES

@@ -4,6 +4,9 @@
 
  Changes between 1.0.0 and 1.1.0  [xx XXX xxxx]
 
+  *) Initial CMAC implementation. WARNING: EXPERIMENTAL, API MAY CHANGE.
+     [Steve Henson]
+
   *) Experiemental regnegotiation in s_server -www mode. If the client 
      browses /reneg connection is renegotiated. If /renegcert it is
      renegotiated requesting a certificate.

Makefile.org

@@ -121,7 +121,7 @@ SDIRS=  \
 	bn ec rsa dsa ecdsa dh ecdh dso engine \
 	buffer bio stack lhash rand err \
 	evp asn1 pem x509 x509v3 conf txt_db pkcs7 pkcs12 comp ocsp ui krb5 \
-	cms pqueue ts jpake store
+	cms pqueue ts jpake store cmac
 # keep in mind that the above list is adjusted by ./Configure
 # according to no-xxx arguments...
 

crypto/cmac/Makefile

+#
+# OpenSSL/crypto/cmac/Makefile
+#
+
+DIR=	cmac
+TOP=	../..
+CC=	cc
+INCLUDES=
+CFLAG=-g
+MAKEFILE=	Makefile
+AR=		ar r
+
+CFLAGS= $(INCLUDES) $(CFLAG)
+
+GENERAL=Makefile
+TEST=
+APPS=
+
+LIB=$(TOP)/libcrypto.a
+LIBSRC=cmac.c
+LIBOBJ=cmac.o
+
+SRC= $(LIBSRC)
+
+EXHEADER= cmac.h
+HEADER=	$(EXHEADER)
+
+ALL=    $(GENERAL) $(SRC) $(HEADER)
+
+top:
+	(cd ../..; $(MAKE) DIRS=crypto SDIRS=$(DIR) sub_all)
+
+all:	lib
+
+lib:	$(LIBOBJ)
+	$(AR) $(LIB) $(LIBOBJ)
+	$(RANLIB) $(LIB) || echo Never mind.
+	@touch lib
+
+files:
+	$(PERL) $(TOP)/util/files.pl Makefile >> $(TOP)/MINFO
+
+links:
+	@$(PERL) $(TOP)/util/mklink.pl ../../include/openssl $(EXHEADER)
+	@$(PERL) $(TOP)/util/mklink.pl ../../test $(TEST)
+	@$(PERL) $(TOP)/util/mklink.pl ../../apps $(APPS)
+
+install:
+	@[ -n "$(INSTALLTOP)" ] # should be set by top Makefile...
+	@headerlist="$(EXHEADER)"; for i in $$headerlist ; \
+	do  \
+	(cp $$i $(INSTALL_PREFIX)$(INSTALLTOP)/include/openssl/$$i; \
+	chmod 644 $(INSTALL_PREFIX)$(INSTALLTOP)/include/openssl/$$i ); \
+	done;
+
+tags:
+	ctags $(SRC)
+
+tests:
+
+lint:
+	lint -DLINT $(INCLUDES) $(SRC)>fluff
+
+depend:
+	@[ -n "$(MAKEDEPEND)" ] # should be set by upper Makefile...
+	$(MAKEDEPEND) -- $(CFLAG) $(INCLUDES) $(DEPFLAG) -- $(PROGS) $(LIBSRC)
+
+dclean:
+	$(PERL) -pe 'if (/^# DO NOT DELETE THIS LINE/) {print; exit(0);}' $(MAKEFILE) >Makefile.new
+	mv -f Makefile.new $(MAKEFILE)
+
+clean:
+	rm -f *.o *.obj lib tags core .pure .nfs* *.old *.bak fluff
+
+# DO NOT DELETE THIS LINE -- make depend depends on it.
+

crypto/cmac/cmac.c

+/* crypto/cmac/cmac.c */
+/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
+ * project.
+ */
+/* ====================================================================
+ * Copyright (c) 2010 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.
+ * ====================================================================
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "cryptlib.h"
+#include <openssl/cmac.h>
+
+struct CMAC_CTX_st
+	{
+	/* Cipher context to use */
+	EVP_CIPHER_CTX cctx;
+	/* Keys k1 and k2 */
+	unsigned char k1[EVP_MAX_BLOCK_LENGTH];
+	unsigned char k2[EVP_MAX_BLOCK_LENGTH];
+	/* Temporary block */
+	unsigned char tbl[EVP_MAX_BLOCK_LENGTH];
+	/* Last (possibly partial) block */
+	unsigned char last_block[EVP_MAX_BLOCK_LENGTH];
+	/* Number of bytes in last block: -1 means context not initialised */
+	int nlast_block;
+	};
+
+
+/* Make temporary keys K1 and K2 */
+
+static void make_kn(unsigned char *k1, unsigned char *l, int bl)
+	{
+	int i;
+	/* Shift block to left, including carry */
+	for (i = 0; i < bl; i++)
+		{
+		k1[i] = l[i] << 1;
+		if (i < bl - 1 && l[i + 1] & 0x80)
+			k1[i] |= 1;
+		}
+	/* If MSB set fixup with R */
+	if (l[0] & 0x80)
+		k1[bl - 1] ^= bl == 16 ? 0x87 : 0x1b;
+	}
+
+CMAC_CTX *CMAC_CTX_new(void)
+	{
+	CMAC_CTX *ctx;
+	ctx = OPENSSL_malloc(sizeof(CMAC_CTX));
+	if (!ctx)
+		return NULL;
+	EVP_CIPHER_CTX_init(&ctx->cctx);
+	ctx->nlast_block = -1;
+	return ctx;
+	}
+
+void CMAC_CTX_cleanup(CMAC_CTX *ctx)
+	{
+	EVP_CIPHER_CTX_cleanup(&ctx->cctx);
+	OPENSSL_cleanse(ctx->tbl, EVP_MAX_BLOCK_LENGTH);
+	OPENSSL_cleanse(ctx->k1, EVP_MAX_BLOCK_LENGTH);
+	OPENSSL_cleanse(ctx->k2, EVP_MAX_BLOCK_LENGTH);
+	OPENSSL_cleanse(ctx->last_block, EVP_MAX_BLOCK_LENGTH);
+	ctx->nlast_block = -1;
+	}
+
+EVP_CIPHER_CTX *CMAC_CTX_get0_cipher_ctx(CMAC_CTX *ctx)
+	{
+	return &ctx->cctx;
+	}
+
+void CMAC_CTX_free(CMAC_CTX *ctx)
+	{
+	CMAC_CTX_cleanup(ctx);
+	OPENSSL_free(ctx);
+	}
+
+int CMAC_Init(CMAC_CTX *ctx, const void *key, size_t keylen, 
+			const EVP_CIPHER *cipher, ENGINE *impl)
+	{
+	static unsigned char zero_iv[EVP_MAX_BLOCK_LENGTH];
+	/* All zeros means restart */
+	if (!key && !cipher && !impl && keylen == 0)
+		{
+		/* Not initialised */
+		if (ctx->last_block == -1)
+			return 0;
+		if (!EVP_EncryptInit_ex(&ctx->cctx, NULL, NULL, NULL, zero_iv))
+			return 0;
+		return 0;
+		}
+	/* Initialiase context */
+	if (cipher && !EVP_EncryptInit_ex(&ctx->cctx, cipher, impl, NULL, NULL))
+		return 0;
+	/* Non-NULL key means initialisation complete */
+	if (key)
+		{
+		int bl;
+		if (!EVP_CIPHER_CTX_cipher(&ctx->cctx))
+			return 0;
+		if (!EVP_CIPHER_CTX_set_key_length(&ctx->cctx, keylen))
+			return 0;
+		if (!EVP_EncryptInit_ex(&ctx->cctx, NULL, NULL, key, zero_iv))
+			return 0;
+		bl = EVP_CIPHER_CTX_block_size(&ctx->cctx);
+		if (!EVP_Cipher(&ctx->cctx, ctx->tbl, zero_iv, bl))
+			return 0;
+		make_kn(ctx->k1, ctx->tbl, bl);
+		make_kn(ctx->k2, ctx->k1, bl);
+		OPENSSL_cleanse(ctx->tbl, bl);
+		/* Reset context again ready for first data block */
+		if (!EVP_EncryptInit_ex(&ctx->cctx, NULL, NULL, NULL, zero_iv))
+			return 0;
+		ctx->nlast_block = 0;
+		}
+	return 1;
+	}
+
+int CMAC_Update(CMAC_CTX *ctx, const void *in, size_t dlen)
+	{
+	const unsigned char *data = in;
+	size_t bl;
+	if (ctx->nlast_block == -1)
+		return 0;
+	if (dlen == 0)
+		return 1;
+	bl = EVP_CIPHER_CTX_block_size(&ctx->cctx);
+	/* Copy into partial block if we need to */
+	if (ctx->nlast_block > 0)
+		{
+		size_t nleft;
+		nleft = bl - ctx->nlast_block;
+		if (dlen < nleft)
+			nleft = dlen;
+		memcpy(ctx->last_block + ctx->nlast_block, data, nleft);
+		dlen -= nleft;
+		ctx->nlast_block += nleft;
+		/* If no more to process return */
+		if (dlen == 0)
+			return 1;
+		data += nleft;
+		/* Else not final block so encrypt it */
+		if (!EVP_Cipher(&ctx->cctx, ctx->tbl, ctx->last_block,bl))
+			return 0;
+		}
+	/* Encrypt all but one of the complete blocks left */
+	while(dlen > bl)
+		{
+		if (!EVP_Cipher(&ctx->cctx, ctx->tbl, data, bl))
+			return 0;
+		dlen -= bl;
+		data += bl;
+		}
+	/* Copy any data left to last block buffer */
+	memcpy(ctx->last_block, data, dlen);
+	ctx->nlast_block = dlen;
+	return 1;
+
+	}
+
+size_t CMAC_Final(CMAC_CTX *ctx, unsigned char *out)
+	{
+	int i, bl, lb;
+	if (ctx->nlast_block == -1)
+		return 0;
+	bl = EVP_CIPHER_CTX_block_size(&ctx->cctx);
+	lb = ctx->nlast_block;
+	/* Is last block complete? */
+	if (lb == bl)
+		{
+		for (i = 0; i < bl; i++)
+			ctx->last_block[i] ^= ctx->k1[i];
+		}
+	else
+		{
+		ctx->last_block[lb] = 0x80;
+		if (bl - lb > 1)
+			memset(ctx->last_block + lb + 1, 0, bl - lb - 1);
+		for (i = 0; i < bl; i++)
+			ctx->last_block[i] ^= ctx->k2[i];
+		}
+	if (!EVP_Cipher(&ctx->cctx, out, ctx->last_block, bl))
+		return 0;
+	return bl;
+	}

crypto/cmac/cmac.h

+/* crypto/cmac/cmac.h */
+/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
+ * project.
+ */
+/* ====================================================================
+ * Copyright (c) 2010 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.
+ * ====================================================================
+ */
+
+
+#ifndef HEADER_CMAC_H
+#define HEADER_CMAC_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <openssl/evp.h>
+
+/* Opaque */
+typedef struct CMAC_CTX_st CMAC_CTX;
+
+CMAC_CTX *CMAC_CTX_new(void);
+void CMAC_CTX_cleanup(CMAC_CTX *ctx);
+void CMAC_CTX_free(CMAC_CTX *ctx);
+EVP_CIPHER_CTX *CMAC_CTX_get0_cipher_ctx(CMAC_CTX *ctx);
+
+int CMAC_Init(CMAC_CTX *ctx, const void *key, size_t keylen, 
+			const EVP_CIPHER *cipher, ENGINE *impl);
+int CMAC_Update(CMAC_CTX *ctx, const void *data, size_t dlen);
+int CMAC_Final(CMAC_CTX *ctx, unsigned char *out);
+
+#ifdef  __cplusplus
+}
+#endif
+#endif