The Tor Browser: security/nss/lib/freebl/desblapi.c@6474c204b198 (annotated)

security/nss/lib/freebl/desblapi.c@6474c204b198 (annotated)

security/nss/lib/freebl/desblapi.c

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /*
  *  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 <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];
 #elif defined(USE_MEMCPY)
 #define COPY8B(to, from, ptr) memcpy(to, from, 8)
 #else
 #define COPY8B(to, from, ptr) \
     if (((ptrdiff_t)(ptr) & 0x3) == 0) { \
     	HALFPTR(to)[0] = HALFPTR(from)[0]; \
     	HALFPTR(to)[1] = HALFPTR(from)[1]; \
     } else if (((ptrdiff_t)(ptr) & 0x1) == 0) { \
     	SHORTPTR(to)[0] = SHORTPTR(from)[0]; \
     	SHORTPTR(to)[1] = SHORTPTR(from)[1]; \
     	SHORTPTR(to)[2] = SHORTPTR(from)[2]; \
     	SHORTPTR(to)[3] = SHORTPTR(from)[3]; \
     } else { \
     	BYTEPTR(to)[0] = BYTEPTR(from)[0]; \
     	BYTEPTR(to)[1] = BYTEPTR(from)[1]; \
     	BYTEPTR(to)[2] = BYTEPTR(from)[2]; \
     	BYTEPTR(to)[3] = BYTEPTR(from)[3]; \
     	BYTEPTR(to)[4] = BYTEPTR(from)[4]; \
     	BYTEPTR(to)[5] = BYTEPTR(from)[5]; \
     	BYTEPTR(to)[6] = BYTEPTR(from)[6]; \
     	BYTEPTR(to)[7] = BYTEPTR(from)[7]; \
     }
 #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
 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
 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
 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
 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;
 }

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security/nss/lib/freebl/desblapi.c@6474c204b198 (annotated)

security/nss/lib/freebl/desblapi.c