plc（Power Line Communication）通信测
2018-05-28 本文已影响0人
hades2013
plc（Power Line Communication）通信测试程序
plconfig.c
/*
plconfig.c version 0.2
Source code for Intellon-based Powerline bridge configuration tool
Copyright (C) 2002-2003 Manuel Kasper <mk@neon1.net>.
All rights reserved.
*/
/*
* Linux specific code by Enrik Berkhan <enrik.berkhan@inka.de>
* Copyright (C) 2004 Manuel Kasper <mk@neon1.net>.
*/
#include <sys/types.h>
#include <sys/time.h>
#include <sys/ioctl.h>
#ifdef LINUX
#include <linux/types.h>
#include <netinet/in.h>
#include <netpacket/packet.h>
#include <net/ethernet.h>
#include <string.h>
#include <signal.h>
#else
#include <net/bpf.h>
#endif
#include <sys/socket.h>
#include <net/if.h>
#include <stdio.h>
#include <sys/uio.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include "global.h"
#include "md5.h"
#define PLCONFIG_VERSION "0.2"
#define ETHERTYPE_INTELLON 0x88E1
#define logictostr(x) (x) ? "yes" : "no"
#ifndef LINUX
/* bpf instructions to filter for Intellon ethertype packets */
struct bpf_insn insns[] = {
BPF_STMT(BPF_LD+BPF_H+BPF_ABS, 12),
BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, ETHERTYPE_INTELLON, 0, 1),
BPF_STMT(BPF_RET+BPF_K, (u_int)-1),
BPF_STMT(BPF_RET+BPF_K, 0)
};
#endif
u_short ex_word(u_char *ptr) {
return ntohs(*((u_short*)ptr));
}
u_long ex_long(u_char *ptr) {
return ntohl(*((u_long*)ptr));
}
char *format_mac_addr(u_char *addr, char *macbuf) {
sprintf(macbuf, "%02x:%02x:%02x:%02x:%02x:%02x",
addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]);
return macbuf;
}
void dump_params_and_stats(u_char *macmgmt) {
printf(" Tx ACK Counter: %u\n"
" Tx NACK Counter: %u\n"
" Tx FAIL Counter: %u\n"
" Tx Contention Loss Counter: %u\n"
" Tx Collision Counter: %u\n"
" Tx CA3 Latency Counter: %u\n"
" Tx CA2 Latency Counter: %u\n"
" Tx CA1 Latency Counter: %u\n"
" Tx CA0 Latency Counter: %u\n"
" Rx Cumul. Bytes per 40-symbol Packet Counter: %lu\n",
ex_word(&macmgmt[2]), ex_word(&macmgmt[4]), ex_word(&macmgmt[6]),
ex_word(&macmgmt[8]), ex_word(&macmgmt[10]), ex_word(&macmgmt[12]),
ex_word(&macmgmt[14]), ex_word(&macmgmt[16]), ex_word(&macmgmt[18]),
ex_long(&macmgmt[20]));
}
void dump_network_statistics(u_char *macmgmt) {
int da;
u_char *stat;
char macbuf[20];
for (da = 0; da < 15; da++) {
stat = (macmgmt+9+da*12);
/* Check to see if that node entry is valid -
stupid Intellon chip is supposed to return 00:00:00:00:00:00 for
nonexistant nodes (as per the specs), but instead it returns
01:00:00:00:00:00 so we just skip checking the first byte,
since heaven knows what else it may return instead of 01 in
other places/revisions.
*/
if (!((stat[1] == 0) && (stat[2] == 0) &&
(stat[3] == 0) && (stat[4] == 0) && (stat[5] == 0))) {
printf("\n Statistics for Network DA #%d:\n"
" MAC address: %s\n"
" Bytes in 40 symbols: %u\n"
" FAILS received: %u\n"
" Frame Drops: %u\n",
da+1, format_mac_addr(stat, macbuf), ex_word(&stat[6]),
ex_word(&stat[8]), ex_word(&stat[10]));
}
}
}
void dump_tx_characteristics(u_char *macmgmt) {
char *retrtab[] = {"Transmit without retries",
"Transmit with one retry only",
"Transmit with normal retries (HomePlug)", "Reserved"};
printf(" Local consumption only: %s\n"
" Encryption flag: %s\n"
" Transmit priority: %u\n"
" Response expected: %s\n"
" Transmit contention free: %s\n"
" Retry control: %s\n"
" No default encryption receive: %s\n"
" No unencrypted receive: %s\n"
" Transmit EKS: %u\n",
logictostr(macmgmt[2] & 0x80), logictostr(macmgmt[2] & 0x40),
(macmgmt[2] >> 4) & 0x03, logictostr(macmgmt[2] & 0x08),
logictostr(macmgmt[2] & 0x04), retrtab[(macmgmt[3] >> 6) & 0x03],
logictostr(macmgmt[3] & 0x08), logictostr(macmgmt[3] & 0x04),
macmgmt[4]);
}
void dump_set_key(u_char *macmgmt) {
char asckey[17];
char *hextab = "0123456789abcdef";
int i;
/* Convert the key to ASCII hex */
for (i = 0; i < 8; i++) {
asckey[i<<1] = hextab[(macmgmt[i+3] >> 4) & 0x0F];
asckey[(i<<1)+1] = hextab[macmgmt[i+3] & 0x0F];
}
asckey[16] = 0;
printf(" Encryption key select: 0x%02x\n"
" Network encryption key: %s\n",
macmgmt[2], asckey);
}
void read_display_responses(int netfd, u_char *framebuf, u_int buflen) {
u_char *frameptr;
ssize_t rdlen;
u_int i, j;
#ifdef LINUX
struct sockaddr_ll addr;
socklen_t addrlen = sizeof(addr);
#else
struct bpf_hdr *header;
#endif
char macbuf[20];
/* read responses */
while (1) {
#ifdef LINUX
rdlen = recvfrom(netfd, framebuf+ETHER_HDR_LEN, buflen-ETHER_HDR_LEN, MSG_TRUNC, (struct sockaddr *)&addr, &addrlen);
#else
rdlen = read(netfd, framebuf, buflen);
#endif
if (rdlen != -1) {
#ifdef LINUX
if (rdlen > buflen-ETHER_HDR_LEN) {
fprintf(stderr, "received jumbo frame of %d bytes len, truncated\n", rdlen);
}
frameptr = framebuf;
memcpy(framebuf+6, &addr.sll_addr, 6);
if (addr.sll_pkttype != PACKET_OUTGOING &&
addr.sll_protocol == htons(ETHERTYPE_INTELLON)) {
#else
header = (struct bpf_hdr*)framebuf;
frameptr = framebuf + header->bh_hdrlen;
if ((frameptr[12] == 0x88) && (frameptr[13] == 0x7B)) {
#endif
/* It's an intellon packet - read MAC management entries */
j = 15;
for (i = 0; i < (frameptr[14] & (u_int)0x7F); i++) {
switch (frameptr[j]) {
case 0x04: /* Set Network Encryption Key */
printf("\n- Set Network Encryption Key from %s\n",
format_mac_addr(&frameptr[6], macbuf));
dump_set_key(&frameptr[j]);
break;
case 0x07: /* Request Parameters and Statistics */
printf("\n- Parameters and Statistics request from %s\n",
format_mac_addr(&frameptr[6], macbuf));
break;
case 0x08: /* Parameters and Statistics Response */
printf("\n- Parameters and Statistics response from %s\n",
format_mac_addr(&frameptr[6], macbuf));
dump_params_and_stats(&frameptr[j]);
break;
case 0x06: /* Confirm Network Encryption Key */
printf("\n- Network encryption key confirmation from %s\n",
format_mac_addr(&frameptr[6], macbuf));
break;
case 0x1a: /* Intellon specific network statistics */
if (!(frameptr[j+2] & 0x80)) { /* Really a response? */
printf("\n- Intellon-specific network statistics from %s\n",
format_mac_addr(&frameptr[6], macbuf));
dump_network_statistics(&frameptr[j]);
} else {
printf("\n- Intellon-specific network statistics request from %s\n",
format_mac_addr(&frameptr[6], macbuf));
}
break;
case 0x1f: /* Set transmit characteristics */
printf("\n- Set transmit characteristics from %s\n",
format_mac_addr(&frameptr[6], macbuf));
dump_tx_characteristics(&frameptr[j]);
break;
default:
printf("- Unknown response (MTYPE = 0x%02x) from %s\n",
frameptr[j], format_mac_addr(&frameptr[6], macbuf));
}
j += frameptr[j+1] + 2;
}
}
}
}
}
unsigned char deskeyparity(unsigned char kb) {
unsigned char parity = 0, i, mykb = kb;
for (i = 0; i < 7; i++) {
mykb >>= 1;
parity += (mykb & 0x01);
}
return ((kb & 0xFE) | (~parity & 0x01));
}
void usage(void) {
printf("%s",
"\nPowerline Bridge config version " PLCONFIG_VERSION " by Manuel Kasper <mk@neon1.net>\n\n"
#ifdef LINUX
"Usage: plconfig [-pqrh] [-s key] interface\n\n"
#else
"Usage: plconfig [-pqrh] [-b device] [-s key] interface\n\n"
#endif
" -s key set network encryption key\n"
" (plaintext password or 8 hex bytes preceded by 0x)\n"
#ifndef LINUX
" -b device use device (default is /dev/bpf0)\n"
#endif
" -p don't switch interface to promiscuous mode\n"
" -r request parameters and statistics\n"
" -q request Intellon-specific network statistics\n"
" -h display this help\n\n"
" If -s is not specified, plconfig will listen for management packets\n"
" indefinitely (after requesting stats if -r is specified)\n\n");
}
int main(int argc, char *argv[]) {
int netfd, ch;
#ifdef LINUX
struct sockaddr_ll addr = { 0,0,0,0,0,0,{0,} };
#else
struct bpf_program filter;
#endif
struct ifreq ifr;
u_int buflen, i;
u_char *framebuf;
#ifndef LINUX
char ifname[8], bpfn[32] = "/dev/bpf0";
#endif
u_char netkey[8], nib, outframe[200];
/* options */
int nopromisc = 0, mode = 0;
/* Parse command line options */
while ((ch = getopt(argc, argv, "s:b:pqrh")) != -1) {
switch (ch) {
case 'p':
nopromisc = 1;
break;
case 'r':
mode = 1;
break;
case 'q':
mode = 3;
break;
case 's':
mode = 2;
/* See if it begins with 0x */
if ((optarg[0] == '0') && (optarg[1] == 'x')) {
for (i = 0; i < 8; i++)
netkey[i] = 0;
/* convert ASCII hex to binary */
for (i = 0; i < 16; i++) {
if ((optarg[i+2] >= '0') && (optarg[i+2] <= '9')) {
nib = optarg[i+2] - '0';
} else if ((optarg[i+2] >= 'a') && (optarg[i+2] <= 'f')) {
nib = optarg[i+2] + 0x0a - 'a';
} else if ((optarg[i+2] >= 'A') && (optarg[i+2] <= 'F')) {
nib = optarg[i+2] + 0x0a - 'A';
} else {
fprintf(stderr, "Unrecognized character '%c' in key\n", optarg[i+2]);
exit(1);
}
if (i & 0x01)
netkey[i >> 1] |= nib;
else
netkey[i >> 1] |= (nib << 4);
}
} else {
/* It's a plaintext password - use PBKDF1 on it */
MD5_CTX md5ctx;
u_char digest[16], tmp[256];
strncpy(tmp, optarg, 240);
/* add salt */
strcat(tmp, "\x08\x85\x6d\xaf\x7c\xf5\x81\x85");
/* generate initial digest */
MD5Init(&md5ctx);
MD5Update(&md5ctx, tmp, strlen(tmp));
MD5Final(digest, &md5ctx);
/* loop 999 times as required by HomePlug */
for (i = 0; i < 999; i++) {
MD5Init(&md5ctx);
MD5Update(&md5ctx, digest, 16);
MD5Final(digest, &md5ctx);
}
/* extract the first 8 bytes; calculate parity bit
(LSB = odd parity), even though most powerline bridges
seem to ignore it
*/
for (i = 0; i < 8; i++)
netkey[i] = deskeyparity(digest[i]);
}
break;
#ifndef LINUX
case 'b':
strncpy(bpfn, optarg, 32);
break;
#endif
case '?':
case 'h':
default:
usage();
exit(0);
}
}
argc -= optind;
argv += optind;
if (argc != 1) {
usage();
exit(0);
}
#ifndef LINUX
strncpy(ifname, argv[0], 8);
#endif
/* Open bpf device */
#ifdef LINUX
netfd = socket(PF_PACKET, SOCK_DGRAM, htons(ETHERTYPE_INTELLON));
if (netfd == -1) {
perror("socket");
exit(0);
}
#else
netfd = open(bpfn, O_RDWR);
if (netfd == -1) {
fprintf(stderr, "Cannot open %s\n", bpfn);
exit(0);
}
#endif
#ifdef LINUX
strncpy(ifr.ifr_name, argv[0], sizeof(ifr.ifr_name));
if (ioctl(netfd, SIOCGIFMTU, &ifr) == -1) {
perror("ioctl(SIOCGIFMTU)");
return(1);
}
buflen = ifr.ifr_mtu + ETHER_HDR_LEN;
#else
/* Read buffer length */
if (ioctl(netfd, BIOCGBLEN, &buflen) == -1) {
fprintf(stderr, "ioctl(BIOCGBLEN) error!\n");
exit(0);
}
#endif
/* Allocate buffer */
if (!(framebuf = (u_char*)malloc((size_t)buflen))) {
fprintf(stderr, "Cannot malloc() packet buffer!\n");
exit(0);
}
/* Bind to interface */
#ifdef LINUX
if (ioctl(netfd, SIOCGIFINDEX, &ifr) == -1) {
perror("ioctl(SIOCGIFINDEX)");
return(1);
}
addr.sll_family = AF_PACKET;
addr.sll_protocol = htons(ETHERTYPE_INTELLON);
addr.sll_ifindex = ifr.ifr_ifindex;
if (bind(netfd, (struct sockaddr *)&addr, sizeof(addr)) == -1) {
perror("bind");
return(1);
}
#else
strcpy(ifr.ifr_name, ifname);
if (ioctl(netfd, BIOCSETIF, &ifr) == -1) {
fprintf(stderr, "ioctl(BIOCSETIF) error!\n");
exit(0);
}
#endif
#ifndef LINUX
/* Set filter */
filter.bf_len = sizeof(insns) / sizeof(insns[0]);
filter.bf_insns = insns;
if (ioctl(netfd, BIOCSETF, &filter) == -1) {
fprintf(stderr, "ioctl(BIOCSETF) error!\n");
exit(0);
}
/* Set immediate mode */
i = 1;
if (ioctl(netfd, BIOCIMMEDIATE, &i) == -1) {
fprintf(stderr, "ioctl(BIOCIMMEDIATE) error!\n");
exit(0);
}
#endif
/* Set promiscuous mode
This is necessary because the bridges seem to be returning
responses with the destination MAC address set to their own
MAC address instead of using broadcasts.
*/
if ((!nopromisc) && (mode != 2)) {
#ifdef LINUX
struct packet_mreq mreq = { ifr.ifr_ifindex, PACKET_MR_PROMISC, 0, {0, }};
if (setsockopt(netfd, SOL_PACKET, PACKET_ADD_MEMBERSHIP, &mreq, sizeof(mreq)) == -1) {
perror("setsockopt(PACKET_ADD_MEMBERSHIP, PROMISC)");
return 1;
}
#else
i = 1;
if (ioctl(netfd, BIOCPROMISC, &i) == -1) {
fprintf(stderr, "ioctl(BIOCPROMISC) error!\n");
exit(0);
}
#endif
}
#ifndef LINUX
/* We don't want to see local packets */
i = 0;
if (ioctl(netfd, BIOCGSEESENT, &i) == -1) {
fprintf(stderr, "ioctl(BIOCGSEESENT) error!\n");
exit(0);
}
#endif
if (mode) {
#ifdef LINUX
addr.sll_family = AF_PACKET;
addr.sll_protocol = htons(ETHERTYPE_INTELLON);
addr.sll_ifindex = ifr.ifr_ifindex;
addr.sll_halen = 6;
for (i = 0; i < 6; i++)
addr.sll_addr[i] = 0xFF; /* broadcast */
outframe[0] =0x01; /* one MAC management entry */
#else
/* set up outgoing command frame */
for (i = 0; i < 6; i++)
outframe[i] = 0xFF; /* broadcast */
for (i = 0; i < 6; i++)
outframe[i+6] = 0x00; /* the source address will be set automatically */
outframe[12] = 0x88; /* Intellon ethertype */
outframe[13] = 0x7b;
outframe[14] = 0x01; /* one MAC management entry */
#endif
}
switch (mode) {
case 1: /* request parameters & statistics */
#ifdef LINUX
outframe[1] = 0x07; /* request parameters and statistics */
outframe[2] = 0x0; /* 0 bytes follow */
/* write out packet */
sendto(netfd, outframe, 3, 0, (struct sockaddr *)&addr, sizeof(addr));
#else
outframe[15] = 0x07; /* request parameters and statistics */
outframe[16] = 0x0; /* 0 bytes follow */
/* fill the rest with zeroes to maintain minimum data payload of 46 bytes */
for (i = 0; i < 43; i++)
outframe[i+17] = 0x00;
/* write out packet */
write(netfd, outframe, 60);
#endif
break;
case 2: /* set network key */
#ifdef LINUX
outframe[1] = 0x04; /* set network key */
outframe[2] = 0x09; /* 9 bytes follow */
outframe[3] = 0x01; /* encryption key select -> 1 */
for (i = 0; i < 8; i++)
outframe[i+4] = netkey[i];
/* write out packet */
sendto(netfd, outframe, 12, 0, (struct sockaddr *)&addr, sizeof(addr));
#else
outframe[15] = 0x04; /* set network key */
outframe[16] = 0x09; /* 9 bytes follow */
outframe[17] = 0x01; /* encryption key select -> 1 */
for (i = 0; i < 8; i++)
outframe[i+18] = netkey[i];
/* fill the rest with zeroes to maintain minimum data payload of 46 bytes */
for (i = 0; i < 34; i++)
outframe[i+26] = 0x00;
/* write out packet */
write(netfd, outframe, 60);
#endif
break;
case 3: /* request Intellon-specific network statistics */
#ifdef LINUX
outframe[1] = 0x1a; /* request network statistics */
outframe[2] = 0xbb; /* 187 bytes follow */
outframe[3] = 0x80; /* read the stats, don't clear them */
for (i = 0; i < 186; i++)
outframe[i+4] = 0x00;
/* write out packet */
sendto(netfd, outframe, 190, 0, (struct sockaddr *)&addr, sizeof(addr));
#else
outframe[15] = 0x1a; /* request network statistics */
outframe[16] = 0xbb; /* 187 bytes follow */
outframe[17] = 0x80; /* read the stats, don't clear them */
for (i = 0; i < 186; i++)
outframe[i+18] = 0x00;
/* write out packet */
write(netfd, outframe, 204);
#endif
break;
}
if (mode != 2)
read_display_responses(netfd, framebuf, buflen);
free(framebuf);
/* Close bpf device */
close(netfd);
return 0;
}
头文件：
/* GLOBAL.H - RSAREF types and constants
*/
/* PROTOTYPES should be set to one if and only if the compiler supports
function argument prototyping.
The following makes PROTOTYPES default to 0 if it has not already
been defined with C compiler flags.
*/
#ifndef PROTOTYPES
#define PROTOTYPES 0
#endif
/* POINTER defines a generic pointer type */
typedef unsigned char *POINTER;
/* UINT2 defines a two byte word */
typedef unsigned short int UINT2;
/* UINT4 defines a four byte word */
typedef unsigned long int UINT4;
/* PROTO_LIST is defined depending on how PROTOTYPES is defined above.
If using PROTOTYPES, then PROTO_LIST returns the list, otherwise it
returns an empty list.
*/
#if PROTOTYPES
#define PROTO_LIST(list) list
#else
#define PROTO_LIST(list) ()
#endif
md5:
/* MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm
*/
#include "global.h"
#include "md5.h"
/* Constants for MD5Transform routine.
*/
#define S11 7
#define S12 12
#define S13 17
#define S14 22
#define S21 5
#define S22 9
#define S23 14
#define S24 20
#define S31 4
#define S32 11
#define S33 16
#define S34 23
#define S41 6
#define S42 10
#define S43 15
#define S44 21
static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
static void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
static void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
static void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
static unsigned char PADDING[64] = {
0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
/* F, G, H and I are basic MD5 functions.
*/
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))
/* ROTATE_LEFT rotates x left n bits.
*/
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
Rotation is separate from addition to prevent recomputation.
*/
#define FF(a, b, c, d, x, s, ac) { \
(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
#define GG(a, b, c, d, x, s, ac) { \
(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
#define HH(a, b, c, d, x, s, ac) { \
(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
#define II(a, b, c, d, x, s, ac) { \
(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
void MD5Init (context)
MD5_CTX *context; /* context */
{
context->count[0] = context->count[1] = 0;
/* Load magic initialization constants.
*/
context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
}
/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
void MD5Update (context, input, inputLen)
MD5_CTX *context; /* context */
unsigned char *input; /* input block */
unsigned int inputLen; /* length of input block */
{
unsigned int i, index, partLen;
/* Compute number of bytes mod 64 */
index = (unsigned int)((context->count[0] >> 3) & 0x3F);
/* Update number of bits */
if ((context->count[0] += ((UINT4)inputLen << 3))
< ((UINT4)inputLen << 3))
context->count[1]++;
context->count[1] += ((UINT4)inputLen >> 29);
partLen = 64 - index;
/* Transform as many times as possible.
*/
if (inputLen >= partLen) {
MD5_memcpy
((POINTER)&context->buffer[index], (POINTER)input, partLen);
MD5Transform (context->state, context->buffer);
for (i = partLen; i + 63 < inputLen; i += 64)
MD5Transform (context->state, &input[i]);
index = 0;
}
else
i = 0;
/* Buffer remaining input */
MD5_memcpy
((POINTER)&context->buffer[index], (POINTER)&input[i],
inputLen-i);
}
/* MD5 finalization. Ends an MD5 message-digest operation, writing the
the message digest and zeroizing the context.
*/
void MD5Final (digest, context)
unsigned char digest[16]; /* message digest */
MD5_CTX *context; /* context */
{
unsigned char bits[8];
unsigned int index, padLen;
/* Save number of bits */
Encode (bits, context->count, 8);
/* Pad out to 56 mod 64.
*/
index = (unsigned int)((context->count[0] >> 3) & 0x3f);
padLen = (index < 56) ? (56 - index) : (120 - index);
MD5Update (context, PADDING, padLen);
/* Append length (before padding) */
MD5Update (context, bits, 8);
/* Store state in digest */
Encode (digest, context->state, 16);
/* Zeroize sensitive information.
*/
MD5_memset ((POINTER)context, 0, sizeof (*context));
}
/* MD5 basic transformation. Transforms state based on block.
*/
static void MD5Transform (state, block)
UINT4 state[4];
unsigned char block[64];
{
UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
Decode (x, block, 64);
/* Round 1 */
FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
/* Round 2 */
GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */
GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
/* Round 3 */
HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */
HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
/* Round 4 */
II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
state[0] += a;
state[1] += b;
state[2] += c;
state[3] += d;
/* Zeroize sensitive information.
*/
MD5_memset ((POINTER)x, 0, sizeof (x));
}
/* Encodes input (UINT4) into output (unsigned char). Assumes len is
a multiple of 4.
*/
static void Encode (output, input, len)
unsigned char *output;
UINT4 *input;
unsigned int len;
{
unsigned int i, j;
for (i = 0, j = 0; j < len; i++, j += 4) {
output[j] = (unsigned char)(input[i] & 0xff);
output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
}
}
/* Decodes input (unsigned char) into output (UINT4). Assumes len is
a multiple of 4.
*/
static void Decode (output, input, len)
UINT4 *output;
unsigned char *input;
unsigned int len;
{
unsigned int i, j;
for (i = 0, j = 0; j < len; i++, j += 4)
output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) |
(((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);
}
/* Note: Replace "for loop" with standard memcpy if possible.
*/
static void MD5_memcpy (output, input, len)
POINTER output;
POINTER input;
unsigned int len;
{
unsigned int i;
for (i = 0; i < len; i++)
output[i] = input[i];
}
/* Note: Replace "for loop" with standard memset if possible.
*/
static void MD5_memset (output, value, len)
POINTER output;
int value;
unsigned int len;
{
unsigned int i;
for (i = 0; i < len; i++)
((char *)output)[i] = (char)value;
}
md5头文件
/* MD5.H - header file for MD5C.C
*/
/* MD5 context. */
typedef struct {
UINT4 state[4]; /* state (ABCD) */
UINT4 count[2]; /* number of bits, modulo 2^64 (lsb first) */
unsigned char buffer[64]; /* input buffer */
} MD5_CTX;
void MD5Init PROTO_LIST ((MD5_CTX *));
void MD5Update PROTO_LIST
((MD5_CTX *, unsigned char *, unsigned int));
void MD5Final PROTO_LIST ((unsigned char [16], MD5_CTX *));
