[thirdparty/openssl.git] / crypto / des / cfb64ede.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 "des_locl.h"
#include "e_os.h"

/*
 * The input and output encrypted as though 64bit cfb mode is being used.
 * The extra state information to record how much of the 64bit block we have
 * used is contained in *num;
 */

void DES_ede3_cfb64_encrypt(const unsigned char *in, unsigned char *out,
                            long length, DES_key_schedule *ks1,
                            DES_key_schedule *ks2, DES_key_schedule *ks3,
                            DES_cblock *ivec, int *num, int enc)
{
    register DES_LONG v0, v1;
    register long l = length;
    register int n = *num;
    DES_LONG ti[2];
    unsigned char *iv, c, cc;

    iv = &(*ivec)[0];
    if (enc) {
        while (l--) {
            if (n == 0) {
                c2l(iv, v0);
                c2l(iv, v1);

                ti[0] = v0;
                ti[1] = v1;
                DES_encrypt3(ti, ks1, ks2, ks3);
                v0 = ti[0];
                v1 = ti[1];

                iv = &(*ivec)[0];
                l2c(v0, iv);
                l2c(v1, iv);
                iv = &(*ivec)[0];
            }
            c = *(in++) ^ iv[n];
            *(out++) = c;
            iv[n] = c;
            n = (n + 1) & 0x07;
        }
    } else {
        while (l--) {
            if (n == 0) {
                c2l(iv, v0);
                c2l(iv, v1);

                ti[0] = v0;
                ti[1] = v1;
                DES_encrypt3(ti, ks1, ks2, ks3);
                v0 = ti[0];
                v1 = ti[1];

                iv = &(*ivec)[0];
                l2c(v0, iv);
                l2c(v1, iv);
                iv = &(*ivec)[0];
            }
            cc = *(in++);
            c = iv[n];
            iv[n] = cc;
            *(out++) = c ^ cc;
            n = (n + 1) & 0x07;
        }
    }
    v0 = v1 = ti[0] = ti[1] = c = cc = 0;
    *num = n;
}

/*
 * This is compatible with the single key CFB-r for DES, even thought that's
 * not what EVP needs.
 */

void DES_ede3_cfb_encrypt(const unsigned char *in, unsigned char *out,
                          int numbits, long length, DES_key_schedule *ks1,
                          DES_key_schedule *ks2, DES_key_schedule *ks3,
                          DES_cblock *ivec, int enc)
{
    register DES_LONG d0, d1, v0, v1;
    register unsigned long l = length, n = ((unsigned int)numbits + 7) / 8;
    register int num = numbits, i;
    DES_LONG ti[2];
    unsigned char *iv;
    unsigned char ovec[16];

    if (num > 64)
        return;
    iv = &(*ivec)[0];
    c2l(iv, v0);
    c2l(iv, v1);
    if (enc) {
        while (l >= n) {
            l -= n;
            ti[0] = v0;
            ti[1] = v1;
            DES_encrypt3(ti, ks1, ks2, ks3);
            c2ln(in, d0, d1, n);
            in += n;
            d0 ^= ti[0];
            d1 ^= ti[1];
            l2cn(d0, d1, out, n);
            out += n;
            /*
             * 30-08-94 - eay - changed because l>>32 and l<<32 are bad under
             * gcc :-(
             */
            if (num == 32) {
                v0 = v1;
                v1 = d0;
            } else if (num == 64) {
                v0 = d0;
                v1 = d1;
            } else {
                iv = &ovec[0];
                l2c(v0, iv);
                l2c(v1, iv);
                l2c(d0, iv);
                l2c(d1, iv);
                /* shift ovec left most of the bits... */
                memmove(ovec, ovec + num / 8, 8 + (num % 8 ? 1 : 0));
                /* now the remaining bits */
                if (num % 8 != 0)
                    for (i = 0; i < 8; ++i) {
                        ovec[i] <<= num % 8;
                        ovec[i] |= ovec[i + 1] >> (8 - num % 8);
                    }
                iv = &ovec[0];
                c2l(iv, v0);
                c2l(iv, v1);
            }
        }
    } else {
        while (l >= n) {
            l -= n;
            ti[0] = v0;
            ti[1] = v1;
            DES_encrypt3(ti, ks1, ks2, ks3);
            c2ln(in, d0, d1, n);
            in += n;
            /*
             * 30-08-94 - eay - changed because l>>32 and l<<32 are bad under
             * gcc :-(
             */
            if (num == 32) {
                v0 = v1;
                v1 = d0;
            } else if (num == 64) {
                v0 = d0;
                v1 = d1;
            } else {
                iv = &ovec[0];
                l2c(v0, iv);
                l2c(v1, iv);
                l2c(d0, iv);
                l2c(d1, iv);
                /* shift ovec left most of the bits... */
                memmove(ovec, ovec + num / 8, 8 + (num % 8 ? 1 : 0));
                /* now the remaining bits */
                if (num % 8 != 0)
                    for (i = 0; i < 8; ++i) {
                        ovec[i] <<= num % 8;
                        ovec[i] |= ovec[i + 1] >> (8 - num % 8);
                    }
                iv = &ovec[0];
                c2l(iv, v0);
                c2l(iv, v1);
            }
            d0 ^= ti[0];
            d1 ^= ti[1];
            l2cn(d0, d1, out, n);
            out += n;
        }
    }
    iv = &(*ivec)[0];
    l2c(v0, iv);
    l2c(v1, iv);
    v0 = v1 = d0 = d1 = ti[0] = ti[1] = 0;
}
Commit	Line	Data
58964a49	1	/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
d02b48c6 RE	2	* All rights reserved.
	3	*
	4	* This package is an SSL implementation written
	5	* by Eric Young (eay@cryptsoft.com).
	6	* The implementation was written so as to conform with Netscapes SSL.
0f113f3e	7	*
d02b48c6 RE	8	* This library is free for commercial and non-commercial use as long as
	9	* the following conditions are aheared to. The following conditions
	10	* apply to all code found in this distribution, be it the RC4, RSA,
	11	* lhash, DES, etc., code; not just the SSL code. The SSL documentation
	12	* included with this distribution is covered by the same copyright terms
	13	* except that the holder is Tim Hudson (tjh@cryptsoft.com).
0f113f3e	14	*
d02b48c6 RE	15	* Copyright remains Eric Young's, and as such any Copyright notices in
	16	* the code are not to be removed.
	17	* If this package is used in a product, Eric Young should be given attribution
	18	* as the author of the parts of the library used.
	19	* This can be in the form of a textual message at program startup or
	20	* in documentation (online or textual) provided with the package.
0f113f3e	21	*
d02b48c6 RE	22	* Redistribution and use in source and binary forms, with or without
	23	* modification, are permitted provided that the following conditions
	24	* are met:
	25	* 1. Redistributions of source code must retain the copyright
	26	* notice, this list of conditions and the following disclaimer.
	27	* 2. Redistributions in binary form must reproduce the above copyright
	28	* notice, this list of conditions and the following disclaimer in the
	29	* documentation and/or other materials provided with the distribution.
	30	* 3. All advertising materials mentioning features or use of this software
	31	* must display the following acknowledgement:
	32	* "This product includes cryptographic software written by
	33	* Eric Young (eay@cryptsoft.com)"
	34	* The word 'cryptographic' can be left out if the rouines from the library
	35	* being used are not cryptographic related :-).
0f113f3e	36	* 4. If you include any Windows specific code (or a derivative thereof) from
d02b48c6 RE	37	* the apps directory (application code) you must include an acknowledgement:
d02b48c6 RE	38	* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
0f113f3e	39	*
d02b48c6 RE	40	* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
	41	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	42	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	43	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
	44	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	45	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	46	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	47	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	48	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	49	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	50	* SUCH DAMAGE.
0f113f3e	51	*
d02b48c6 RE	52	* The licence and distribution terms for any publically available version or
	53	* derivative of this code cannot be changed. i.e. this code cannot simply be
	54	* copied and put under another distribution licence
	55	* [including the GNU Public Licence.]
	56	*/
	57
	58	#include "des_locl.h"
1a4b8e7c	59	#include "e_os.h"
d02b48c6	60
0f113f3e MC	61	/*
	62	* The input and output encrypted as though 64bit cfb mode is being used.
	63	* The extra state information to record how much of the 64bit block we have
	64	* used is contained in *num;
d02b48c6 RE	65	*/
d02b48c6 RE	66
c2e4f17c	67	void DES_ede3_cfb64_encrypt(const unsigned char in, unsigned char out,
0f113f3e MC	68	long length, DES_key_schedule *ks1,
	69	DES_key_schedule ks2, DES_key_schedule ks3,
	70	DES_cblock ivec, int num, int enc)
	71	{
	72	register DES_LONG v0, v1;
	73	register long l = length;
	74	register int n = *num;
	75	DES_LONG ti[2];
	76	unsigned char *iv, c, cc;
d02b48c6	77
0f113f3e MC	78	iv = &(*ivec)[0];
	79	if (enc) {
	80	while (l--) {
	81	if (n == 0) {
	82	c2l(iv, v0);
	83	c2l(iv, v1);
d02b48c6	84
0f113f3e MC	85	ti[0] = v0;
	86	ti[1] = v1;
	87	DES_encrypt3(ti, ks1, ks2, ks3);
	88	v0 = ti[0];
	89	v1 = ti[1];
d02b48c6	90
0f113f3e MC	91	iv = &(*ivec)[0];
	92	l2c(v0, iv);
	93	l2c(v1, iv);
	94	iv = &(*ivec)[0];
	95	}
	96	c = *(in++) ^ iv[n];
	97	*(out++) = c;
	98	iv[n] = c;
	99	n = (n + 1) & 0x07;
	100	}
	101	} else {
	102	while (l--) {
	103	if (n == 0) {
	104	c2l(iv, v0);
	105	c2l(iv, v1);
d02b48c6	106
0f113f3e MC	107	ti[0] = v0;
	108	ti[1] = v1;
	109	DES_encrypt3(ti, ks1, ks2, ks3);
	110	v0 = ti[0];
	111	v1 = ti[1];
d02b48c6	112
0f113f3e MC	113	iv = &(*ivec)[0];
	114	l2c(v0, iv);
	115	l2c(v1, iv);
	116	iv = &(*ivec)[0];
	117	}
	118	cc = *(in++);
	119	c = iv[n];
	120	iv[n] = cc;
	121	*(out++) = c ^ cc;
	122	n = (n + 1) & 0x07;
	123	}
	124	}
	125	v0 = v1 = ti[0] = ti[1] = c = cc = 0;
	126	*num = n;
	127	}
d02b48c6	128
0f113f3e MC	129	/*
0f113f3e MC	130	* This is compatible with the single key CFB-r for DES, even thought that's
8c6336b0 AP	131	* not what EVP needs.
	132	*/
	133
0f113f3e MC	134	void DES_ede3_cfb_encrypt(const unsigned char in, unsigned char out,
	135	int numbits, long length, DES_key_schedule *ks1,
	136	DES_key_schedule ks2, DES_key_schedule ks3,
	137	DES_cblock *ivec, int enc)
	138	{
	139	register DES_LONG d0, d1, v0, v1;
	140	register unsigned long l = length, n = ((unsigned int)numbits + 7) / 8;
	141	register int num = numbits, i;
	142	DES_LONG ti[2];
	143	unsigned char *iv;
	144	unsigned char ovec[16];
8c6336b0	145
0f113f3e MC	146	if (num > 64)
	147	return;
	148	iv = &(*ivec)[0];
	149	c2l(iv, v0);
	150	c2l(iv, v1);
	151	if (enc) {
	152	while (l >= n) {
	153	l -= n;
	154	ti[0] = v0;
	155	ti[1] = v1;
	156	DES_encrypt3(ti, ks1, ks2, ks3);
	157	c2ln(in, d0, d1, n);
	158	in += n;
	159	d0 ^= ti[0];
	160	d1 ^= ti[1];
	161	l2cn(d0, d1, out, n);
	162	out += n;
	163	/*
	164	* 30-08-94 - eay - changed because l>>32 and l<<32 are bad under
	165	* gcc :-(
	166	*/
	167	if (num == 32) {
	168	v0 = v1;
	169	v1 = d0;
	170	} else if (num == 64) {
	171	v0 = d0;
	172	v1 = d1;
	173	} else {
	174	iv = &ovec[0];
	175	l2c(v0, iv);
	176	l2c(v1, iv);
	177	l2c(d0, iv);
	178	l2c(d1, iv);
	179	/* shift ovec left most of the bits... */
	180	memmove(ovec, ovec + num / 8, 8 + (num % 8 ? 1 : 0));
	181	/* now the remaining bits */
	182	if (num % 8 != 0)
	183	for (i = 0; i < 8; ++i) {
	184	ovec[i] <<= num % 8;
	185	ovec[i] \|= ovec[i + 1] >> (8 - num % 8);
	186	}
	187	iv = &ovec[0];
	188	c2l(iv, v0);
	189	c2l(iv, v1);
	190	}
	191	}
	192	} else {
	193	while (l >= n) {
	194	l -= n;
	195	ti[0] = v0;
	196	ti[1] = v1;
	197	DES_encrypt3(ti, ks1, ks2, ks3);
	198	c2ln(in, d0, d1, n);
	199	in += n;
	200	/*
	201	* 30-08-94 - eay - changed because l>>32 and l<<32 are bad under
	202	* gcc :-(
	203	*/
	204	if (num == 32) {
	205	v0 = v1;
	206	v1 = d0;
	207	} else if (num == 64) {
	208	v0 = d0;
	209	v1 = d1;
210	} else {
211	iv = &ovec[0];
212	l2c(v0, iv);
213	l2c(v1, iv);
214	l2c(d0, iv);
215	l2c(d1, iv);
216	/* shift ovec left most of the bits... */
217	memmove(ovec, ovec + num / 8, 8 + (num % 8 ? 1 : 0));
218	/* now the remaining bits */
219	if (num % 8 != 0)
220	for (i = 0; i < 8; ++i) {
221	ovec[i] <<= num % 8;
222	ovec[i] \|= ovec[i + 1] >> (8 - num % 8);
223	}
224	iv = &ovec[0];
225	c2l(iv, v0);
226	c2l(iv, v1);
227	}
228	d0 ^= ti[0];
229	d1 ^= ti[1];
230	l2cn(d0, d1, out, n);
231	out += n;
232	}
233	}
234	iv = &(*ivec)[0];
235	l2c(v0, iv);
236	l2c(v1, iv);
237	v0 = v1 = d0 = d1 = ti[0] = ti[1] = 0;
238	}