Add reference ChaCha20 and Poly1305 implementations.

# dirs in crypto to build

SDIRS=  \

	objects \

	md2 md4 md5 sha mdc2 hmac ripemd whrlpool \

	des aes rc2 rc4 rc5 idea bf cast camellia seed modes \

	md2 md4 md5 sha mdc2 hmac ripemd whrlpool poly1305 \

	des aes rc2 rc4 rc5 idea bf cast camellia seed chacha modes \

	bn ec rsa dsa dh dso engine \

	buffer bio stack lhash rand err \

	evp asn1 pem x509 x509v3 conf txt_db pkcs7 pkcs12 comp ocsp ui \

#

# OpenSSL/crypto/chacha/Makefile

#

DIR=	chacha

TOP=	../..

CC=	cc

CPP=    $(CC) -E

INCLUDES=

CFLAG=-g

AR=		ar r

CHACHA_ENC=chacha_enc.o

CFLAGS= $(INCLUDES) $(CFLAG)

ASFLAGS= $(INCLUDES) $(ASFLAG)

AFLAGS= $(ASFLAGS)

GENERAL=Makefile

TEST=chachatest.c

APPS=

LIB=$(TOP)/libcrypto.a

LIBSRC=chacha_enc.c

LIBOBJ=$(CHACHA_ENC)

SRC= $(LIBSRC)

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

tags:

	ctags $(SRC)

tests:

lint:

	lint -DLINT $(INCLUDES) $(SRC)>fluff

update:	depend

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 *.s *.o *.obj lib tags core .pure .nfs* *.old *.bak fluff

# DO NOT DELETE THIS LINE -- make depend depends on it.

chacha_enc.o: ../include/internal/chacha.h chacha_enc.c

/* ====================================================================

 * Copyright (c) 2011-2013 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.

 * ====================================================================

 */

/* Adapted from the public domain code by D. Bernstein from SUPERCOP. */

#include <string.h>

#include "internal/chacha.h"

typedef unsigned int u32;

typedef unsigned char u8;

typedef union {

    u32 u[16];

    u8 c[64];

} chacha_buf;

# define ROTATE(v, n) (((v) << (n)) | ((v) >> (32 - (n))))

# define U32TO8_LITTLE(p, v) do { \

                                (p)[0] = (u8)(v >>  0); \

                                (p)[1] = (u8)(v >>  8); \

                                (p)[2] = (u8)(v >> 16); \

                                (p)[3] = (u8)(v >> 24); \

                                } while(0)

/* QUARTERROUND updates a, b, c, d with a ChaCha "quarter" round. */

# define QUARTERROUND(a,b,c,d) ( \

                x[a] += x[b], x[d] = ROTATE((x[d] ^ x[a]),16), \

                x[c] += x[d], x[b] = ROTATE((x[b] ^ x[c]),12), \

                x[a] += x[b], x[d] = ROTATE((x[d] ^ x[a]), 8), \

                x[c] += x[d], x[b] = ROTATE((x[b] ^ x[c]), 7)  )

/* chacha_core performs 20 rounds of ChaCha on the input words in

 * |input| and writes the 64 output bytes to |output|. */

static void chacha20_core(chacha_buf *output, const u32 input[16])

{

    u32 x[16];

    int i;

    const union {

        long one;

        char little;

    } is_endian = { 1 };

    memcpy(x, input, sizeof(x));

    for (i = 20; i > 0; i -= 2) {

        QUARTERROUND(0, 4, 8, 12);

        QUARTERROUND(1, 5, 9, 13);

        QUARTERROUND(2, 6, 10, 14);

        QUARTERROUND(3, 7, 11, 15);

        QUARTERROUND(0, 5, 10, 15);

        QUARTERROUND(1, 6, 11, 12);

        QUARTERROUND(2, 7, 8, 13);

        QUARTERROUND(3, 4, 9, 14);

    }

    if (is_endian.little) {

        for (i = 0; i < 16; ++i)

            output->u[i] = x[i] + input[i];

    } else {

        for (i = 0; i < 16; ++i)

            U32TO8_LITTLE(output->c + 4 * i, (x[i] + input[i]));

    }

}

void ChaCha20_ctr32(unsigned char *out, const unsigned char *inp,

                    size_t len, const unsigned int key[8],

                    const unsigned int counter[4])

{

    u32 input[16];

    chacha_buf buf;

    size_t todo, i;

    /* sigma constant "expand 32-byte k" in little-endian encoding */

    input[0] = ((u32)'e') | ((u32)'x'<<8) | ((u32)'p'<<16) | ((u32)'a'<<24);

    input[1] = ((u32)'n') | ((u32)'d'<<8) | ((u32)' '<<16) | ((u32)'3'<<24);

    input[2] = ((u32)'2') | ((u32)'-'<<8) | ((u32)'b'<<16) | ((u32)'y'<<24);

    input[3] = ((u32)'t') | ((u32)'e'<<8) | ((u32)' '<<16) | ((u32)'k'<<24);

    input[4] = key[0];

    input[5] = key[1];

    input[6] = key[2];

    input[7] = key[3];

    input[8] = key[4];

    input[9] = key[5];

    input[10] = key[6];

    input[11] = key[7];

    input[12] = counter[0];

    input[13] = counter[1];

    input[14] = counter[2];

    input[15] = counter[3];

    while (len > 0) {

        todo = sizeof(buf);

        if (len < todo)

            todo = len;

        chacha20_core(&buf, input);

        for (i = 0; i < todo; i++)

            out[i] = inp[i] ^ buf.c[i];

        out += todo;

        inp += todo;

        len -= todo;

        /* advance counter */

        if (++input[12] == 0)

            input[13]++;

    }

}

/* ====================================================================

 * Copyright (c) 2014 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

 *    openssl-core@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_CHACHA_H

#define HEADER_CHACHA_H

#include <stddef.h>

#ifdef __cplusplus

extern "C" {

#endif

/*

 * ChaCha20_ctr32 encrypts |len| bytes from |inp| with the given key and

 * nonce and writes the result to |out|, which may be equal to |inp|.

 * The |key| is not 32 bytes of verbatim key material though, but the

 * said material collected into 8 32-bit elements array in host byte

 * order. Same approach applies to nonce: the |counter| argument is

 * pointer to concatenated nonce and counter values collected into 4

 * 32-bit elements. This, passing crypto material collected into 32-bit

 * elements as opposite to passing verbatim byte vectors, is chosen for

 * efficiency in multi-call scenarios.

 */

void ChaCha20_ctr32(unsigned char *out, const unsigned char *inp,

                    size_t len, const unsigned int key[8],

                    const unsigned int counter[4]);

/*

 * You can notice that there is no key setup procedure. Because it's

 * as trivial as collecting bytes into 32-bit elements, it's reckoned

 * that below macro is sufficient.

 */

#define CHACHA_U8TOU32(p)  ( \

                ((unsigned int)(p)[0])     | ((unsigned int)(p)[1]<<8) | \

                ((unsigned int)(p)[2]<<16) | ((unsigned int)(p)[3]<<24)  )

#define CHACHA_KEY_SIZE		32

#define CHACHA_CTR_SIZE		16

#define CHACHA_BLK_SIZE		64

#ifdef __cplusplus

}

#endif

#endif

/* ====================================================================

 * Copyright (c) 2014 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

 *    openssl-core@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 <stddef.h>

#define POLY1305_BLOCK_SIZE 16

typedef struct poly1305_context POLY1305;

size_t Poly1305_ctx_size(void);

void Poly1305_Init(POLY1305 *ctx, const unsigned char key[32]);

void Poly1305_Update(POLY1305 *ctx, const unsigned char *inp, size_t len);

void Poly1305_Final(POLY1305 *ctx, unsigned char mac[16]);