/src/openssl/crypto/des/cfb64ede.c

Source (jump to first uncovered line)
/* 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;
}

#ifdef undef                    /* MACRO */
void DES_ede2_cfb64_encrypt(unsigned char *in, unsigned char *out,
                            long length, DES_key_schedule ks1,
                            DES_key_schedule ks2, DES_cblock (*ivec),
                            int *num, int enc)
{
    DES_ede3_cfb64_encrypt(in, out, length, ks1, ks2, ks1, ivec, num, enc);
}
#endif

/*
 * 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;
}

Coverage Report

Created: 2022-11-30 06:20

Line	Count	Source (jump to first uncovered line)
1		/* crypto/des/cfb64ede.c */
2		/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3		* All rights reserved.
4		*
5		* This package is an SSL implementation written
6		* by Eric Young (eay@cryptsoft.com).
7		* The implementation was written so as to conform with Netscapes SSL.
8		*
9		* This library is free for commercial and non-commercial use as long as
10		* the following conditions are aheared to. The following conditions
11		* apply to all code found in this distribution, be it the RC4, RSA,
12		* lhash, DES, etc., code; not just the SSL code. The SSL documentation
13		* included with this distribution is covered by the same copyright terms
14		* except that the holder is Tim Hudson (tjh@cryptsoft.com).
15		*
16		* Copyright remains Eric Young's, and as such any Copyright notices in
17		* the code are not to be removed.
18		* If this package is used in a product, Eric Young should be given attribution
19		* as the author of the parts of the library used.
20		* This can be in the form of a textual message at program startup or
21		* in documentation (online or textual) provided with the package.
22		*
23		* Redistribution and use in source and binary forms, with or without
24		* modification, are permitted provided that the following conditions
25		* are met:
26		* 1. Redistributions of source code must retain the copyright
27		* notice, this list of conditions and the following disclaimer.
28		* 2. Redistributions in binary form must reproduce the above copyright
29		* notice, this list of conditions and the following disclaimer in the
30		* documentation and/or other materials provided with the distribution.
31		* 3. All advertising materials mentioning features or use of this software
32		* must display the following acknowledgement:
33		* "This product includes cryptographic software written by
34		* Eric Young (eay@cryptsoft.com)"
35		* The word 'cryptographic' can be left out if the rouines from the library
36		* being used are not cryptographic related :-).
37		* 4. If you include any Windows specific code (or a derivative thereof) from
38		* the apps directory (application code) you must include an acknowledgement:
39		* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40		*
41		* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42		* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43		* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44		* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45		* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46		* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47		* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48		* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49		* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50		* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51		* SUCH DAMAGE.
52		*
53		* The licence and distribution terms for any publically available version or
54		* derivative of this code cannot be changed. i.e. this code cannot simply be
55		* copied and put under another distribution licence
56		* [including the GNU Public Licence.]
57		*/
58
59		#include "des_locl.h"
60		#include "e_os.h"
61
62		/*
63		* The input and output encrypted as though 64bit cfb mode is being used.
64		* The extra state information to record how much of the 64bit block we have
65		* used is contained in *num;
66		*/
67
68		void DES_ede3_cfb64_encrypt(const unsigned char in, unsigned char out,
69		long length, DES_key_schedule *ks1,
70		DES_key_schedule ks2, DES_key_schedule ks3,
71		DES_cblock ivec, int num, int enc)
72	0	{
73	0	register DES_LONG v0, v1;
74	0	register long l = length;
75	0	register int n = *num;
76	0	DES_LONG ti[2];
77	0	unsigned char *iv, c, cc;
78
79	0	iv = &(*ivec)[0];
80	0	if (enc) {
81	0	while (l--) {
82	0	if (n == 0) {
83	0	c2l(iv, v0);
84	0	c2l(iv, v1);
85
86	0	ti[0] = v0;
87	0	ti[1] = v1;
88	0	DES_encrypt3(ti, ks1, ks2, ks3);
89	0	v0 = ti[0];
90	0	v1 = ti[1];
91
92	0	iv = &(*ivec)[0];
93	0	l2c(v0, iv);
94	0	l2c(v1, iv);
95	0	iv = &(*ivec)[0];
96	0	}
97	0	c = *(in++) ^ iv[n];
98	0	*(out++) = c;
99	0	iv[n] = c;
100	0	n = (n + 1) & 0x07;
101	0	}
102	0	} else {
103	0	while (l--) {
104	0	if (n == 0) {
105	0	c2l(iv, v0);
106	0	c2l(iv, v1);
107
108	0	ti[0] = v0;
109	0	ti[1] = v1;
110	0	DES_encrypt3(ti, ks1, ks2, ks3);
111	0	v0 = ti[0];
112	0	v1 = ti[1];
113
114	0	iv = &(*ivec)[0];
115	0	l2c(v0, iv);
116	0	l2c(v1, iv);
117	0	iv = &(*ivec)[0];
118	0	}
119	0	cc = *(in++);
120	0	c = iv[n];
121	0	iv[n] = cc;
122	0	*(out++) = c ^ cc;
123	0	n = (n + 1) & 0x07;
124	0	}
125	0	}
126	0	v0 = v1 = ti[0] = ti[1] = c = cc = 0;
127	0	*num = n;
128	0	}
129
130		#ifdef undef /* MACRO */
131		void DES_ede2_cfb64_encrypt(unsigned char in, unsigned char out,
132		long length, DES_key_schedule ks1,
133		DES_key_schedule ks2, DES_cblock (*ivec),
134		int *num, int enc)
135		{
136		DES_ede3_cfb64_encrypt(in, out, length, ks1, ks2, ks1, ivec, num, enc);
137		}
138		#endif
139
140		/*
141		* This is compatible with the single key CFB-r for DES, even thought that's
142		* not what EVP needs.
143		*/
144
145		void DES_ede3_cfb_encrypt(const unsigned char in, unsigned char out,
146		int numbits, long length, DES_key_schedule *ks1,
147		DES_key_schedule ks2, DES_key_schedule ks3,
148		DES_cblock *ivec, int enc)
149	0	{
150	0	register DES_LONG d0, d1, v0, v1;
151	0	register unsigned long l = length, n = ((unsigned int)numbits + 7) / 8;
152	0	register int num = numbits, i;
153	0	DES_LONG ti[2];
154	0	unsigned char *iv;
155	0	unsigned char ovec[16];
156
157	0	if (num > 64)
158	0	return;
159	0	iv = &(*ivec)[0];
160	0	c2l(iv, v0);
161	0	c2l(iv, v1);
162	0	if (enc) {
163	0	while (l >= n) {
164	0	l -= n;
165	0	ti[0] = v0;
166	0	ti[1] = v1;
167	0	DES_encrypt3(ti, ks1, ks2, ks3);
168	0	c2ln(in, d0, d1, n);
169	0	in += n;
170	0	d0 ^= ti[0];
171	0	d1 ^= ti[1];
172	0	l2cn(d0, d1, out, n);
173	0	out += n;
174		/*
175		* 30-08-94 - eay - changed because l>>32 and l<<32 are bad under
176		* gcc :-(
177		*/
178	0	if (num == 32) {
179	0	v0 = v1;
180	0	v1 = d0;
181	0	} else if (num == 64) {
182	0	v0 = d0;
183	0	v1 = d1;
184	0	} else {
185	0	iv = &ovec[0];
186	0	l2c(v0, iv);
187	0	l2c(v1, iv);
188	0	l2c(d0, iv);
189	0	l2c(d1, iv);
190		/* shift ovec left most of the bits... */
191	0	memmove(ovec, ovec + num / 8, 8 + (num % 8 ? 1 : 0));
192		/* now the remaining bits */
193	0	if (num % 8 != 0)
194	0	for (i = 0; i < 8; ++i) {
195	0	ovec[i] <<= num % 8;
196	0	ovec[i] \|= ovec[i + 1] >> (8 - num % 8);
197	0	}
198	0	iv = &ovec[0];
199	0	c2l(iv, v0);
200	0	c2l(iv, v1);
201	0	}
202	0	}
203	0	} else {
204	0	while (l >= n) {
205	0	l -= n;
206	0	ti[0] = v0;
207	0	ti[1] = v1;
208	0	DES_encrypt3(ti, ks1, ks2, ks3);
209	0	c2ln(in, d0, d1, n);
210	0	in += n;
211		/*
212		* 30-08-94 - eay - changed because l>>32 and l<<32 are bad under
213		* gcc :-(
214		*/
215	0	if (num == 32) {
216	0	v0 = v1;
217	0	v1 = d0;
218	0	} else if (num == 64) {
219	0	v0 = d0;
220	0	v1 = d1;
221	0	} else {
222	0	iv = &ovec[0];
223	0	l2c(v0, iv);
224	0	l2c(v1, iv);
225	0	l2c(d0, iv);
226	0	l2c(d1, iv);
227		/* shift ovec left most of the bits... */
228	0	memmove(ovec, ovec + num / 8, 8 + (num % 8 ? 1 : 0));
229		/* now the remaining bits */
230	0	if (num % 8 != 0)
231	0	for (i = 0; i < 8; ++i) {
232	0	ovec[i] <<= num % 8;
233	0	ovec[i] \|= ovec[i + 1] >> (8 - num % 8);
234	0	}
235	0	iv = &ovec[0];
236	0	c2l(iv, v0);
237	0	c2l(iv, v1);
238	0	}
239	0	d0 ^= ti[0];
240	0	d1 ^= ti[1];
241	0	l2cn(d0, d1, out, n);
242	0	out += n;
243	0	}
244	0	}
245	0	iv = &(*ivec)[0];
246	0	l2c(v0, iv);
247	0	l2c(v1, iv);
248	0	v0 = v1 = d0 = d1 = ti[0] = ti[1] = 0;
249	0	}