/src/nss/lib/freebl/desblapi.c

Source (jump to first uncovered line)
/*
 *  desblapi.c
 *
 *  core source file for DES-150 library
 *  Implement DES Modes of Operation and Triple-DES.
 *  Adapt DES-150 to blapi API.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifdef FREEBL_NO_DEPEND
#include "stubs.h"
#endif

#include "des.h"
#include "blapii.h"
#include <stddef.h>
#include "secerr.h"

#if defined(NSS_X86_OR_X64)
/* Intel X86 CPUs do unaligned loads and stores without complaint. */
#define COPY8B(to, from, ptr) \
    HALFPTR(to)               \
    [0] = HALFPTR(from)[0];   \
    HALFPTR(to)               \
    [1] = HALFPTR(from)[1];
#else
#define COPY8B(to, from, ptr) memcpy(to, from, 8)
#endif
#define COPY8BTOHALF(to, from) COPY8B(to, from, from)
#define COPY8BFROMHALF(to, from) COPY8B(to, from, to)

static void
DES_ECB(DESContext *cx, BYTE *out, const BYTE *in, unsigned int len)
{
    while (len) {
        DES_Do1Block(cx->ks0, in, out);
        len -= 8;
        in += 8;
        out += 8;
    }
}

static void
DES_EDE3_ECB(DESContext *cx, BYTE *out, const BYTE *in, unsigned int len)
{
    while (len) {
        DES_Do1Block(cx->ks0, in, out);
        len -= 8;
        in += 8;
        DES_Do1Block(cx->ks1, out, out);
        DES_Do1Block(cx->ks2, out, out);
        out += 8;
    }
}

static void NO_SANITIZE_ALIGNMENT
DES_CBCEn(DESContext *cx, BYTE *out, const BYTE *in, unsigned int len)
{
    const BYTE *bufend = in + len;
    HALF vec[2];

    while (in != bufend) {
        COPY8BTOHALF(vec, in);
        in += 8;
        vec[0] ^= cx->iv[0];
        vec[1] ^= cx->iv[1];
        DES_Do1Block(cx->ks0, (BYTE *)vec, (BYTE *)cx->iv);
        COPY8BFROMHALF(out, cx->iv);
        out += 8;
    }
}

static void NO_SANITIZE_ALIGNMENT
DES_CBCDe(DESContext *cx, BYTE *out, const BYTE *in, unsigned int len)
{
    const BYTE *bufend;
    HALF oldciphertext[2];
    HALF plaintext[2];

    for (bufend = in + len; in != bufend;) {
        oldciphertext[0] = cx->iv[0];
        oldciphertext[1] = cx->iv[1];
        COPY8BTOHALF(cx->iv, in);
        in += 8;
        DES_Do1Block(cx->ks0, (BYTE *)cx->iv, (BYTE *)plaintext);
        plaintext[0] ^= oldciphertext[0];
        plaintext[1] ^= oldciphertext[1];
        COPY8BFROMHALF(out, plaintext);
        out += 8;
    }
}

static void NO_SANITIZE_ALIGNMENT
DES_EDE3CBCEn(DESContext *cx, BYTE *out, const BYTE *in, unsigned int len)
{
    const BYTE *bufend = in + len;
    HALF vec[2];

    while (in != bufend) {
        COPY8BTOHALF(vec, in);
        in += 8;
        vec[0] ^= cx->iv[0];
        vec[1] ^= cx->iv[1];
        DES_Do1Block(cx->ks0, (BYTE *)vec, (BYTE *)cx->iv);
        DES_Do1Block(cx->ks1, (BYTE *)cx->iv, (BYTE *)cx->iv);
        DES_Do1Block(cx->ks2, (BYTE *)cx->iv, (BYTE *)cx->iv);
        COPY8BFROMHALF(out, cx->iv);
        out += 8;
    }
}

static void NO_SANITIZE_ALIGNMENT
DES_EDE3CBCDe(DESContext *cx, BYTE *out, const BYTE *in, unsigned int len)
{
    const BYTE *bufend;
    HALF oldciphertext[2];
    HALF plaintext[2];

    for (bufend = in + len; in != bufend;) {
        oldciphertext[0] = cx->iv[0];
        oldciphertext[1] = cx->iv[1];
        COPY8BTOHALF(cx->iv, in);
        in += 8;
        DES_Do1Block(cx->ks0, (BYTE *)cx->iv, (BYTE *)plaintext);
        DES_Do1Block(cx->ks1, (BYTE *)plaintext, (BYTE *)plaintext);
        DES_Do1Block(cx->ks2, (BYTE *)plaintext, (BYTE *)plaintext);
        plaintext[0] ^= oldciphertext[0];
        plaintext[1] ^= oldciphertext[1];
        COPY8BFROMHALF(out, plaintext);
        out += 8;
    }
}

DESContext *
DES_AllocateContext(void)
{
    return PORT_ZNew(DESContext);
}

SECStatus
DES_InitContext(DESContext *cx, const unsigned char *key, unsigned int keylen,
                const unsigned char *iv, int mode, unsigned int encrypt,
                unsigned int unused)
{
    DESDirection opposite;
    if (!cx) {
        PORT_SetError(SEC_ERROR_INVALID_ARGS);
        return SECFailure;
    }
    cx->direction = encrypt ? DES_ENCRYPT : DES_DECRYPT;
    opposite = encrypt ? DES_DECRYPT : DES_ENCRYPT;
    switch (mode) {
        case NSS_DES: /* DES ECB */
            DES_MakeSchedule(cx->ks0, key, cx->direction);
            cx->worker = &DES_ECB;
            break;

        case NSS_DES_EDE3: /* DES EDE ECB */
            cx->worker = &DES_EDE3_ECB;
            if (encrypt) {
                DES_MakeSchedule(cx->ks0, key, cx->direction);
                DES_MakeSchedule(cx->ks1, key + 8, opposite);
                DES_MakeSchedule(cx->ks2, key + 16, cx->direction);
            } else {
                DES_MakeSchedule(cx->ks2, key, cx->direction);
                DES_MakeSchedule(cx->ks1, key + 8, opposite);
                DES_MakeSchedule(cx->ks0, key + 16, cx->direction);
            }
            break;

        case NSS_DES_CBC: /* DES CBC */
            COPY8BTOHALF(cx->iv, iv);
            cx->worker = encrypt ? &DES_CBCEn : &DES_CBCDe;
            DES_MakeSchedule(cx->ks0, key, cx->direction);
            break;

        case NSS_DES_EDE3_CBC: /* DES EDE CBC */
            COPY8BTOHALF(cx->iv, iv);
            if (encrypt) {
                cx->worker = &DES_EDE3CBCEn;
                DES_MakeSchedule(cx->ks0, key, cx->direction);
                DES_MakeSchedule(cx->ks1, key + 8, opposite);
                DES_MakeSchedule(cx->ks2, key + 16, cx->direction);
            } else {
                cx->worker = &DES_EDE3CBCDe;
                DES_MakeSchedule(cx->ks2, key, cx->direction);
                DES_MakeSchedule(cx->ks1, key + 8, opposite);
                DES_MakeSchedule(cx->ks0, key + 16, cx->direction);
            }
            break;

        default:
            PORT_SetError(SEC_ERROR_INVALID_ARGS);
            return SECFailure;
    }
    return SECSuccess;
}

DESContext *
DES_CreateContext(const BYTE *key, const BYTE *iv, int mode, PRBool encrypt)
{
    DESContext *cx = PORT_ZNew(DESContext);
    SECStatus rv = DES_InitContext(cx, key, 0, iv, mode, encrypt, 0);

    if (rv != SECSuccess) {
        PORT_ZFree(cx, sizeof *cx);
        cx = NULL;
    }
    return cx;
}

void
DES_DestroyContext(DESContext *cx, PRBool freeit)
{
    if (cx) {
        memset(cx, 0, sizeof *cx);
        if (freeit)
            PORT_Free(cx);
    }
}

SECStatus
DES_Encrypt(DESContext *cx, BYTE *out, unsigned int *outLen,
            unsigned int maxOutLen, const BYTE *in, unsigned int inLen)
{

    if ((inLen % 8) != 0 || maxOutLen < inLen || !cx ||
        cx->direction != DES_ENCRYPT) {
        PORT_SetError(SEC_ERROR_INVALID_ARGS);
        return SECFailure;
    }

    cx->worker(cx, out, in, inLen);
    if (outLen)
        *outLen = inLen;
    return SECSuccess;
}

SECStatus
DES_Decrypt(DESContext *cx, BYTE *out, unsigned int *outLen,
            unsigned int maxOutLen, const BYTE *in, unsigned int inLen)
{

    if ((inLen % 8) != 0 || maxOutLen < inLen || !cx ||
        cx->direction != DES_DECRYPT) {
        PORT_SetError(SEC_ERROR_INVALID_ARGS);
        return SECFailure;
    }

    cx->worker(cx, out, in, inLen);
    if (outLen)
        *outLen = inLen;
    return SECSuccess;
}

Coverage Report

Created: 2024-05-20 06:23

Line	Count	Source (jump to first uncovered line)
1		/*
2		* desblapi.c
3		*
4		* core source file for DES-150 library
5		* Implement DES Modes of Operation and Triple-DES.
6		* Adapt DES-150 to blapi API.
7		*
8		* This Source Code Form is subject to the terms of the Mozilla Public
9		* License, v. 2.0. If a copy of the MPL was not distributed with this
10		* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
11
12		#ifdef FREEBL_NO_DEPEND
13		#include "stubs.h"
14		#endif
15
16		#include "des.h"
17		#include "blapii.h"
18		#include <stddef.h>
19		#include "secerr.h"
20
21		#if defined(NSS_X86_OR_X64)
22		/* Intel X86 CPUs do unaligned loads and stores without complaint. */
23		#define COPY8B(to, from, ptr) \
24	0	HALFPTR(to) \
25	0	[0] = HALFPTR(from)[0]; \
26	0	HALFPTR(to) \
27	0	[1] = HALFPTR(from)[1];
28		#else
29		#define COPY8B(to, from, ptr) memcpy(to, from, 8)
30		#endif
31	0	#define COPY8BTOHALF(to, from) COPY8B(to, from, from)
32	0	#define COPY8BFROMHALF(to, from) COPY8B(to, from, to)
33
34		static void
35		DES_ECB(DESContext cx, BYTE out, const BYTE *in, unsigned int len)
36	0	{
37	0	while (len) {
38	0	DES_Do1Block(cx->ks0, in, out);
39	0	len -= 8;
40	0	in += 8;
41	0	out += 8;
42	0	}
43	0	}
44
45		static void
46		DES_EDE3_ECB(DESContext cx, BYTE out, const BYTE *in, unsigned int len)
47	0	{
48	0	while (len) {
49	0	DES_Do1Block(cx->ks0, in, out);
50	0	len -= 8;
51	0	in += 8;
52	0	DES_Do1Block(cx->ks1, out, out);
53	0	DES_Do1Block(cx->ks2, out, out);
54	0	out += 8;
55	0	}
56	0	}
57
58		static void NO_SANITIZE_ALIGNMENT
59		DES_CBCEn(DESContext cx, BYTE out, const BYTE *in, unsigned int len)
60	0	{
61	0	const BYTE *bufend = in + len;
62	0	HALF vec[2];
63
64	0	while (in != bufend) {
65	0	COPY8BTOHALF(vec, in);
66	0	in += 8;
67	0	vec[0] ^= cx->iv[0];
68	0	vec[1] ^= cx->iv[1];
69	0	DES_Do1Block(cx->ks0, (BYTE )vec, (BYTE )cx->iv);
70	0	COPY8BFROMHALF(out, cx->iv);
71	0	out += 8;
72	0	}
73	0	}
74
75		static void NO_SANITIZE_ALIGNMENT
76		DES_CBCDe(DESContext cx, BYTE out, const BYTE *in, unsigned int len)
77	0	{
78	0	const BYTE *bufend;
79	0	HALF oldciphertext[2];
80	0	HALF plaintext[2];
81
82	0	for (bufend = in + len; in != bufend;) {
83	0	oldciphertext[0] = cx->iv[0];
84	0	oldciphertext[1] = cx->iv[1];
85	0	COPY8BTOHALF(cx->iv, in);
86	0	in += 8;
87	0	DES_Do1Block(cx->ks0, (BYTE )cx->iv, (BYTE )plaintext);
88	0	plaintext[0] ^= oldciphertext[0];
89	0	plaintext[1] ^= oldciphertext[1];
90	0	COPY8BFROMHALF(out, plaintext);
91	0	out += 8;
92	0	}
93	0	}
94
95		static void NO_SANITIZE_ALIGNMENT
96		DES_EDE3CBCEn(DESContext cx, BYTE out, const BYTE *in, unsigned int len)
97	0	{
98	0	const BYTE *bufend = in + len;
99	0	HALF vec[2];
100
101	0	while (in != bufend) {
102	0	COPY8BTOHALF(vec, in);
103	0	in += 8;
104	0	vec[0] ^= cx->iv[0];
105	0	vec[1] ^= cx->iv[1];
106	0	DES_Do1Block(cx->ks0, (BYTE )vec, (BYTE )cx->iv);
107	0	DES_Do1Block(cx->ks1, (BYTE )cx->iv, (BYTE )cx->iv);
108	0	DES_Do1Block(cx->ks2, (BYTE )cx->iv, (BYTE )cx->iv);
109	0	COPY8BFROMHALF(out, cx->iv);
110	0	out += 8;
111	0	}
112	0	}
113
114		static void NO_SANITIZE_ALIGNMENT
115		DES_EDE3CBCDe(DESContext cx, BYTE out, const BYTE *in, unsigned int len)
116	0	{
117	0	const BYTE *bufend;
118	0	HALF oldciphertext[2];
119	0	HALF plaintext[2];
120
121	0	for (bufend = in + len; in != bufend;) {
122	0	oldciphertext[0] = cx->iv[0];
123	0	oldciphertext[1] = cx->iv[1];
124	0	COPY8BTOHALF(cx->iv, in);
125	0	in += 8;
126	0	DES_Do1Block(cx->ks0, (BYTE )cx->iv, (BYTE )plaintext);
127	0	DES_Do1Block(cx->ks1, (BYTE )plaintext, (BYTE )plaintext);
128	0	DES_Do1Block(cx->ks2, (BYTE )plaintext, (BYTE )plaintext);
129	0	plaintext[0] ^= oldciphertext[0];
130	0	plaintext[1] ^= oldciphertext[1];
131	0	COPY8BFROMHALF(out, plaintext);
132	0	out += 8;
133	0	}
134	0	}
135
136		DESContext *
137		DES_AllocateContext(void)
138	0	{
139	0	return PORT_ZNew(DESContext);
140	0	}
141
142		SECStatus
143		DES_InitContext(DESContext cx, const unsigned char key, unsigned int keylen,
144		const unsigned char *iv, int mode, unsigned int encrypt,
145		unsigned int unused)
146	0	{
147	0	DESDirection opposite;
148	0	if (!cx) {
149	0	PORT_SetError(SEC_ERROR_INVALID_ARGS);
150	0	return SECFailure;
151	0	}
152	0	cx->direction = encrypt ? DES_ENCRYPT : DES_DECRYPT;
153	0	opposite = encrypt ? DES_DECRYPT : DES_ENCRYPT;
154	0	switch (mode) {
155	0	case NSS_DES: /* DES ECB */
156	0	DES_MakeSchedule(cx->ks0, key, cx->direction);
157	0	cx->worker = &DES_ECB;
158	0	break;
159
160	0	case NSS_DES_EDE3: /* DES EDE ECB */
161	0	cx->worker = &DES_EDE3_ECB;
162	0	if (encrypt) {
163	0	DES_MakeSchedule(cx->ks0, key, cx->direction);
164	0	DES_MakeSchedule(cx->ks1, key + 8, opposite);
165	0	DES_MakeSchedule(cx->ks2, key + 16, cx->direction);
166	0	} else {
167	0	DES_MakeSchedule(cx->ks2, key, cx->direction);
168	0	DES_MakeSchedule(cx->ks1, key + 8, opposite);
169	0	DES_MakeSchedule(cx->ks0, key + 16, cx->direction);
170	0	}
171	0	break;
172
173	0	case NSS_DES_CBC: /* DES CBC */
174	0	COPY8BTOHALF(cx->iv, iv);
175	0	cx->worker = encrypt ? &DES_CBCEn : &DES_CBCDe;
176	0	DES_MakeSchedule(cx->ks0, key, cx->direction);
177	0	break;
178
179	0	case NSS_DES_EDE3_CBC: /* DES EDE CBC */
180	0	COPY8BTOHALF(cx->iv, iv);
181	0	if (encrypt) {
182	0	cx->worker = &DES_EDE3CBCEn;
183	0	DES_MakeSchedule(cx->ks0, key, cx->direction);
184	0	DES_MakeSchedule(cx->ks1, key + 8, opposite);
185	0	DES_MakeSchedule(cx->ks2, key + 16, cx->direction);
186	0	} else {
187	0	cx->worker = &DES_EDE3CBCDe;
188	0	DES_MakeSchedule(cx->ks2, key, cx->direction);
189	0	DES_MakeSchedule(cx->ks1, key + 8, opposite);
190	0	DES_MakeSchedule(cx->ks0, key + 16, cx->direction);
191	0	}
192	0	break;
193
194	0	default:
195	0	PORT_SetError(SEC_ERROR_INVALID_ARGS);
196	0	return SECFailure;
197	0	}
198	0	return SECSuccess;
199	0	}
200
201		DESContext *
202		DES_CreateContext(const BYTE key, const BYTE iv, int mode, PRBool encrypt)
203	0	{
204	0	DESContext *cx = PORT_ZNew(DESContext);
205	0	SECStatus rv = DES_InitContext(cx, key, 0, iv, mode, encrypt, 0);
206
207	0	if (rv != SECSuccess) {
208	0	PORT_ZFree(cx, sizeof *cx);
209	0	cx = NULL;
210	0	}
211	0	return cx;
212	0	}
213
214		void
215		DES_DestroyContext(DESContext *cx, PRBool freeit)
216	0	{
217	0	if (cx) {
218	0	memset(cx, 0, sizeof *cx);
219	0	if (freeit)
220	0	PORT_Free(cx);
221	0	}
222	0	}
223
224		SECStatus
225		DES_Encrypt(DESContext cx, BYTE out, unsigned int *outLen,
226		unsigned int maxOutLen, const BYTE *in, unsigned int inLen)
227	0	{
228
229	0	if ((inLen % 8) != 0 \|\| maxOutLen < inLen \|\| !cx \|\|
230	0	cx->direction != DES_ENCRYPT) {
231	0	PORT_SetError(SEC_ERROR_INVALID_ARGS);
232	0	return SECFailure;
233	0	}
234
235	0	cx->worker(cx, out, in, inLen);
236	0	if (outLen)
237	0	*outLen = inLen;
238	0	return SECSuccess;
239	0	}
240
241		SECStatus
242		DES_Decrypt(DESContext cx, BYTE out, unsigned int *outLen,
243		unsigned int maxOutLen, const BYTE *in, unsigned int inLen)
244	0	{
245
246	0	if ((inLen % 8) != 0 \|\| maxOutLen < inLen \|\| !cx \|\|
247	0	cx->direction != DES_DECRYPT) {
248	0	PORT_SetError(SEC_ERROR_INVALID_ARGS);
249	0	return SECFailure;
250	0	}
251
252	0	cx->worker(cx, out, in, inLen);
253	0	if (outLen)
254	0	*outLen = inLen;
255	0	return SECSuccess;
256	0	}