From 8c968e0355151e1e5033b6793b61320ff400c88a Mon Sep 17 00:00:00 2001 From: "Dr. Stephen Henson" Date: Sun, 7 Feb 2010 18:01:07 +0000 Subject: [PATCH] Initial experimental CMAC implementation. --- CHANGES | 3 + Makefile.org | 2 +- crypto/cmac/Makefile | 76 ++++++++++++++ crypto/cmac/cmac.c | 232 +++++++++++++++++++++++++++++++++++++++++++ crypto/cmac/cmac.h | 80 +++++++++++++++ 5 files changed, 392 insertions(+), 1 deletion(-) create mode 100644 crypto/cmac/Makefile create mode 100644 crypto/cmac/cmac.c create mode 100644 crypto/cmac/cmac.h diff --git a/CHANGES b/CHANGES index bad6a9f4a4..bce3fcf79e 100644 --- a/CHANGES +++ b/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. diff --git a/Makefile.org b/Makefile.org index 00e2386979..94302f9c20 100644 --- a/Makefile.org +++ b/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... diff --git a/crypto/cmac/Makefile b/crypto/cmac/Makefile new file mode 100644 index 0000000000..7a960f6122 --- /dev/null +++ b/crypto/cmac/Makefile @@ -0,0 +1,76 @@ +# +# 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. + diff --git a/crypto/cmac/cmac.c b/crypto/cmac/cmac.c new file mode 100644 index 0000000000..5ec88b3ad7 --- /dev/null +++ b/crypto/cmac/cmac.c @@ -0,0 +1,232 @@ +/* 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 +#include +#include +#include "cryptlib.h" +#include + +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; + } diff --git a/crypto/cmac/cmac.h b/crypto/cmac/cmac.h new file mode 100644 index 0000000000..294b537246 --- /dev/null +++ b/crypto/cmac/cmac.h @@ -0,0 +1,80 @@ +/* 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 + +/* 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 -- 2.25.1