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lwip/netif/ppp/md5.c@0:d7bd7384a37c, 2016-12-07 (annotated)

Committer:
grzemich
Date:
Wed Dec 07 23:47:50 2016 +0000
Revision:
0:d7bd7384a37c
dgd

Who changed what in which revision?

UserRevisionLine numberNew contents of line
grzemich 0:d7bd7384a37c 1 /*
grzemich 0:d7bd7384a37c 2 ***********************************************************************
grzemich 0:d7bd7384a37c 3 ** md5.c -- the source code for MD5 routines **
grzemich 0:d7bd7384a37c 4 ** RSA Data Security, Inc. MD5 Message-Digest Algorithm **
grzemich 0:d7bd7384a37c 5 ** Created: 2/17/90 RLR **
grzemich 0:d7bd7384a37c 6 ** Revised: 1/91 SRD,AJ,BSK,JT Reference C ver., 7/10 constant corr. **
grzemich 0:d7bd7384a37c 7 ***********************************************************************
grzemich 0:d7bd7384a37c 8 */
grzemich 0:d7bd7384a37c 9
grzemich 0:d7bd7384a37c 10 /*
grzemich 0:d7bd7384a37c 11 ***********************************************************************
grzemich 0:d7bd7384a37c 12 ** Copyright (C) 1990, RSA Data Security, Inc. All rights reserved. **
grzemich 0:d7bd7384a37c 13 ** **
grzemich 0:d7bd7384a37c 14 ** License to copy and use this software is granted provided that **
grzemich 0:d7bd7384a37c 15 ** it is identified as the "RSA Data Security, Inc. MD5 Message- **
grzemich 0:d7bd7384a37c 16 ** Digest Algorithm" in all material mentioning or referencing this **
grzemich 0:d7bd7384a37c 17 ** software or this function. **
grzemich 0:d7bd7384a37c 18 ** **
grzemich 0:d7bd7384a37c 19 ** License is also granted to make and use derivative works **
grzemich 0:d7bd7384a37c 20 ** provided that such works are identified as "derived from the RSA **
grzemich 0:d7bd7384a37c 21 ** Data Security, Inc. MD5 Message-Digest Algorithm" in all **
grzemich 0:d7bd7384a37c 22 ** material mentioning or referencing the derived work. **
grzemich 0:d7bd7384a37c 23 ** **
grzemich 0:d7bd7384a37c 24 ** RSA Data Security, Inc. makes no representations concerning **
grzemich 0:d7bd7384a37c 25 ** either the merchantability of this software or the suitability **
grzemich 0:d7bd7384a37c 26 ** of this software for any particular purpose. It is provided "as **
grzemich 0:d7bd7384a37c 27 ** is" without express or implied warranty of any kind. **
grzemich 0:d7bd7384a37c 28 ** **
grzemich 0:d7bd7384a37c 29 ** These notices must be retained in any copies of any part of this **
grzemich 0:d7bd7384a37c 30 ** documentation and/or software. **
grzemich 0:d7bd7384a37c 31 ***********************************************************************
grzemich 0:d7bd7384a37c 32 */
grzemich 0:d7bd7384a37c 33
grzemich 0:d7bd7384a37c 34 #include "lwip/opt.h"
grzemich 0:d7bd7384a37c 35
grzemich 0:d7bd7384a37c 36 #if PPP_SUPPORT /* don't build if not configured for use in lwipopts.h */
grzemich 0:d7bd7384a37c 37
grzemich 0:d7bd7384a37c 38 #if CHAP_SUPPORT || MD5_SUPPORT
grzemich 0:d7bd7384a37c 39
grzemich 0:d7bd7384a37c 40 #include "ppp.h"
grzemich 0:d7bd7384a37c 41 #include "pppdebug.h"
grzemich 0:d7bd7384a37c 42
grzemich 0:d7bd7384a37c 43 #include "md5.h"
grzemich 0:d7bd7384a37c 44
grzemich 0:d7bd7384a37c 45 #include <string.h>
grzemich 0:d7bd7384a37c 46
grzemich 0:d7bd7384a37c 47 /*
grzemich 0:d7bd7384a37c 48 ***********************************************************************
grzemich 0:d7bd7384a37c 49 ** Message-digest routines: **
grzemich 0:d7bd7384a37c 50 ** To form the message digest for a message M **
grzemich 0:d7bd7384a37c 51 ** (1) Initialize a context buffer mdContext using MD5Init **
grzemich 0:d7bd7384a37c 52 ** (2) Call MD5Update on mdContext and M **
grzemich 0:d7bd7384a37c 53 ** (3) Call MD5Final on mdContext **
grzemich 0:d7bd7384a37c 54 ** The message digest is now in mdContext->digest[0...15] **
grzemich 0:d7bd7384a37c 55 ***********************************************************************
grzemich 0:d7bd7384a37c 56 */
grzemich 0:d7bd7384a37c 57
grzemich 0:d7bd7384a37c 58 /* forward declaration */
grzemich 0:d7bd7384a37c 59 static void Transform (u32_t *buf, u32_t *in);
grzemich 0:d7bd7384a37c 60
grzemich 0:d7bd7384a37c 61 static unsigned char PADDING[64] = {
grzemich 0:d7bd7384a37c 62 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
grzemich 0:d7bd7384a37c 63 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
grzemich 0:d7bd7384a37c 64 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
grzemich 0:d7bd7384a37c 65 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
grzemich 0:d7bd7384a37c 66 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
grzemich 0:d7bd7384a37c 67 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
grzemich 0:d7bd7384a37c 68 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
grzemich 0:d7bd7384a37c 69 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
grzemich 0:d7bd7384a37c 70 };
grzemich 0:d7bd7384a37c 71
grzemich 0:d7bd7384a37c 72 /* F, G, H and I are basic MD5 functions */
grzemich 0:d7bd7384a37c 73 #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
grzemich 0:d7bd7384a37c 74 #define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
grzemich 0:d7bd7384a37c 75 #define H(x, y, z) ((x) ^ (y) ^ (z))
grzemich 0:d7bd7384a37c 76 #define I(x, y, z) ((y) ^ ((x) | (~z)))
grzemich 0:d7bd7384a37c 77
grzemich 0:d7bd7384a37c 78 /* ROTATE_LEFT rotates x left n bits */
grzemich 0:d7bd7384a37c 79 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
grzemich 0:d7bd7384a37c 80
grzemich 0:d7bd7384a37c 81 /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4 */
grzemich 0:d7bd7384a37c 82 /* Rotation is separate from addition to prevent recomputation */
grzemich 0:d7bd7384a37c 83 #define FF(a, b, c, d, x, s, ac) \
grzemich 0:d7bd7384a37c 84 {(a) += F ((b), (c), (d)) + (x) + (u32_t)(ac); \
grzemich 0:d7bd7384a37c 85 (a) = ROTATE_LEFT ((a), (s)); \
grzemich 0:d7bd7384a37c 86 (a) += (b); \
grzemich 0:d7bd7384a37c 87 }
grzemich 0:d7bd7384a37c 88 #define GG(a, b, c, d, x, s, ac) \
grzemich 0:d7bd7384a37c 89 {(a) += G ((b), (c), (d)) + (x) + (u32_t)(ac); \
grzemich 0:d7bd7384a37c 90 (a) = ROTATE_LEFT ((a), (s)); \
grzemich 0:d7bd7384a37c 91 (a) += (b); \
grzemich 0:d7bd7384a37c 92 }
grzemich 0:d7bd7384a37c 93 #define HH(a, b, c, d, x, s, ac) \
grzemich 0:d7bd7384a37c 94 {(a) += H ((b), (c), (d)) + (x) + (u32_t)(ac); \
grzemich 0:d7bd7384a37c 95 (a) = ROTATE_LEFT ((a), (s)); \
grzemich 0:d7bd7384a37c 96 (a) += (b); \
grzemich 0:d7bd7384a37c 97 }
grzemich 0:d7bd7384a37c 98 #define II(a, b, c, d, x, s, ac) \
grzemich 0:d7bd7384a37c 99 {(a) += I ((b), (c), (d)) + (x) + (u32_t)(ac); \
grzemich 0:d7bd7384a37c 100 (a) = ROTATE_LEFT ((a), (s)); \
grzemich 0:d7bd7384a37c 101 (a) += (b); \
grzemich 0:d7bd7384a37c 102 }
grzemich 0:d7bd7384a37c 103
grzemich 0:d7bd7384a37c 104 #ifdef __STDC__
grzemich 0:d7bd7384a37c 105 #define UL(x) x##UL
grzemich 0:d7bd7384a37c 106 #else
grzemich 0:d7bd7384a37c 107 #ifdef WIN32
grzemich 0:d7bd7384a37c 108 #define UL(x) x##UL
grzemich 0:d7bd7384a37c 109 #else
grzemich 0:d7bd7384a37c 110 #define UL(x) x
grzemich 0:d7bd7384a37c 111 #endif
grzemich 0:d7bd7384a37c 112 #endif
grzemich 0:d7bd7384a37c 113
grzemich 0:d7bd7384a37c 114 /* The routine MD5Init initializes the message-digest context
grzemich 0:d7bd7384a37c 115 mdContext. All fields are set to zero.
grzemich 0:d7bd7384a37c 116 */
grzemich 0:d7bd7384a37c 117 void
grzemich 0:d7bd7384a37c 118 MD5Init (MD5_CTX *mdContext)
grzemich 0:d7bd7384a37c 119 {
grzemich 0:d7bd7384a37c 120 mdContext->i[0] = mdContext->i[1] = (u32_t)0;
grzemich 0:d7bd7384a37c 121
grzemich 0:d7bd7384a37c 122 /* Load magic initialization constants. */
grzemich 0:d7bd7384a37c 123 mdContext->buf[0] = (u32_t)0x67452301UL;
grzemich 0:d7bd7384a37c 124 mdContext->buf[1] = (u32_t)0xefcdab89UL;
grzemich 0:d7bd7384a37c 125 mdContext->buf[2] = (u32_t)0x98badcfeUL;
grzemich 0:d7bd7384a37c 126 mdContext->buf[3] = (u32_t)0x10325476UL;
grzemich 0:d7bd7384a37c 127 }
grzemich 0:d7bd7384a37c 128
grzemich 0:d7bd7384a37c 129 /* The routine MD5Update updates the message-digest context to
grzemich 0:d7bd7384a37c 130 account for the presence of each of the characters inBuf[0..inLen-1]
grzemich 0:d7bd7384a37c 131 in the message whose digest is being computed.
grzemich 0:d7bd7384a37c 132 */
grzemich 0:d7bd7384a37c 133 void
grzemich 0:d7bd7384a37c 134 MD5Update(MD5_CTX *mdContext, unsigned char *inBuf, unsigned int inLen)
grzemich 0:d7bd7384a37c 135 {
grzemich 0:d7bd7384a37c 136 u32_t in[16];
grzemich 0:d7bd7384a37c 137 int mdi;
grzemich 0:d7bd7384a37c 138 unsigned int i, ii;
grzemich 0:d7bd7384a37c 139
grzemich 0:d7bd7384a37c 140 #if 0
grzemich 0:d7bd7384a37c 141 PPPDEBUG(LOG_INFO, ("MD5Update: %u:%.*H\n", inLen, LWIP_MIN(inLen, 20) * 2, inBuf));
grzemich 0:d7bd7384a37c 142 PPPDEBUG(LOG_INFO, ("MD5Update: %u:%s\n", inLen, inBuf));
grzemich 0:d7bd7384a37c 143 #endif
grzemich 0:d7bd7384a37c 144
grzemich 0:d7bd7384a37c 145 /* compute number of bytes mod 64 */
grzemich 0:d7bd7384a37c 146 mdi = (int)((mdContext->i[0] >> 3) & 0x3F);
grzemich 0:d7bd7384a37c 147
grzemich 0:d7bd7384a37c 148 /* update number of bits */
grzemich 0:d7bd7384a37c 149 if ((mdContext->i[0] + ((u32_t)inLen << 3)) < mdContext->i[0]) {
grzemich 0:d7bd7384a37c 150 mdContext->i[1]++;
grzemich 0:d7bd7384a37c 151 }
grzemich 0:d7bd7384a37c 152 mdContext->i[0] += ((u32_t)inLen << 3);
grzemich 0:d7bd7384a37c 153 mdContext->i[1] += ((u32_t)inLen >> 29);
grzemich 0:d7bd7384a37c 154
grzemich 0:d7bd7384a37c 155 while (inLen--) {
grzemich 0:d7bd7384a37c 156 /* add new character to buffer, increment mdi */
grzemich 0:d7bd7384a37c 157 mdContext->in[mdi++] = *inBuf++;
grzemich 0:d7bd7384a37c 158
grzemich 0:d7bd7384a37c 159 /* transform if necessary */
grzemich 0:d7bd7384a37c 160 if (mdi == 0x40) {
grzemich 0:d7bd7384a37c 161 for (i = 0, ii = 0; i < 16; i++, ii += 4) {
grzemich 0:d7bd7384a37c 162 in[i] = (((u32_t)mdContext->in[ii+3]) << 24) |
grzemich 0:d7bd7384a37c 163 (((u32_t)mdContext->in[ii+2]) << 16) |
grzemich 0:d7bd7384a37c 164 (((u32_t)mdContext->in[ii+1]) << 8) |
grzemich 0:d7bd7384a37c 165 ((u32_t)mdContext->in[ii]);
grzemich 0:d7bd7384a37c 166 }
grzemich 0:d7bd7384a37c 167 Transform (mdContext->buf, in);
grzemich 0:d7bd7384a37c 168 mdi = 0;
grzemich 0:d7bd7384a37c 169 }
grzemich 0:d7bd7384a37c 170 }
grzemich 0:d7bd7384a37c 171 }
grzemich 0:d7bd7384a37c 172
grzemich 0:d7bd7384a37c 173 /* The routine MD5Final terminates the message-digest computation and
grzemich 0:d7bd7384a37c 174 ends with the desired message digest in mdContext->digest[0...15].
grzemich 0:d7bd7384a37c 175 */
grzemich 0:d7bd7384a37c 176 void
grzemich 0:d7bd7384a37c 177 MD5Final (unsigned char hash[], MD5_CTX *mdContext)
grzemich 0:d7bd7384a37c 178 {
grzemich 0:d7bd7384a37c 179 u32_t in[16];
grzemich 0:d7bd7384a37c 180 int mdi;
grzemich 0:d7bd7384a37c 181 unsigned int i, ii;
grzemich 0:d7bd7384a37c 182 unsigned int padLen;
grzemich 0:d7bd7384a37c 183
grzemich 0:d7bd7384a37c 184 /* save number of bits */
grzemich 0:d7bd7384a37c 185 in[14] = mdContext->i[0];
grzemich 0:d7bd7384a37c 186 in[15] = mdContext->i[1];
grzemich 0:d7bd7384a37c 187
grzemich 0:d7bd7384a37c 188 /* compute number of bytes mod 64 */
grzemich 0:d7bd7384a37c 189 mdi = (int)((mdContext->i[0] >> 3) & 0x3F);
grzemich 0:d7bd7384a37c 190
grzemich 0:d7bd7384a37c 191 /* pad out to 56 mod 64 */
grzemich 0:d7bd7384a37c 192 padLen = (mdi < 56) ? (56 - mdi) : (120 - mdi);
grzemich 0:d7bd7384a37c 193 MD5Update (mdContext, PADDING, padLen);
grzemich 0:d7bd7384a37c 194
grzemich 0:d7bd7384a37c 195 /* append length in bits and transform */
grzemich 0:d7bd7384a37c 196 for (i = 0, ii = 0; i < 14; i++, ii += 4) {
grzemich 0:d7bd7384a37c 197 in[i] = (((u32_t)mdContext->in[ii+3]) << 24) |
grzemich 0:d7bd7384a37c 198 (((u32_t)mdContext->in[ii+2]) << 16) |
grzemich 0:d7bd7384a37c 199 (((u32_t)mdContext->in[ii+1]) << 8) |
grzemich 0:d7bd7384a37c 200 ((u32_t)mdContext->in[ii]);
grzemich 0:d7bd7384a37c 201 }
grzemich 0:d7bd7384a37c 202 Transform (mdContext->buf, in);
grzemich 0:d7bd7384a37c 203
grzemich 0:d7bd7384a37c 204 /* store buffer in digest */
grzemich 0:d7bd7384a37c 205 for (i = 0, ii = 0; i < 4; i++, ii += 4) {
grzemich 0:d7bd7384a37c 206 mdContext->digest[ii] = (unsigned char)(mdContext->buf[i] & 0xFF);
grzemich 0:d7bd7384a37c 207 mdContext->digest[ii+1] =
grzemich 0:d7bd7384a37c 208 (unsigned char)((mdContext->buf[i] >> 8) & 0xFF);
grzemich 0:d7bd7384a37c 209 mdContext->digest[ii+2] =
grzemich 0:d7bd7384a37c 210 (unsigned char)((mdContext->buf[i] >> 16) & 0xFF);
grzemich 0:d7bd7384a37c 211 mdContext->digest[ii+3] =
grzemich 0:d7bd7384a37c 212 (unsigned char)((mdContext->buf[i] >> 24) & 0xFF);
grzemich 0:d7bd7384a37c 213 }
grzemich 0:d7bd7384a37c 214 SMEMCPY(hash, mdContext->digest, 16);
grzemich 0:d7bd7384a37c 215 }
grzemich 0:d7bd7384a37c 216
grzemich 0:d7bd7384a37c 217 /* Basic MD5 step. Transforms buf based on in.
grzemich 0:d7bd7384a37c 218 */
grzemich 0:d7bd7384a37c 219 static void
grzemich 0:d7bd7384a37c 220 Transform (u32_t *buf, u32_t *in)
grzemich 0:d7bd7384a37c 221 {
grzemich 0:d7bd7384a37c 222 u32_t a = buf[0], b = buf[1], c = buf[2], d = buf[3];
grzemich 0:d7bd7384a37c 223
grzemich 0:d7bd7384a37c 224 /* Round 1 */
grzemich 0:d7bd7384a37c 225 #define S11 7
grzemich 0:d7bd7384a37c 226 #define S12 12
grzemich 0:d7bd7384a37c 227 #define S13 17
grzemich 0:d7bd7384a37c 228 #define S14 22
grzemich 0:d7bd7384a37c 229 FF ( a, b, c, d, in[ 0], S11, UL(3614090360)); /* 1 */
grzemich 0:d7bd7384a37c 230 FF ( d, a, b, c, in[ 1], S12, UL(3905402710)); /* 2 */
grzemich 0:d7bd7384a37c 231 FF ( c, d, a, b, in[ 2], S13, UL( 606105819)); /* 3 */
grzemich 0:d7bd7384a37c 232 FF ( b, c, d, a, in[ 3], S14, UL(3250441966)); /* 4 */
grzemich 0:d7bd7384a37c 233 FF ( a, b, c, d, in[ 4], S11, UL(4118548399)); /* 5 */
grzemich 0:d7bd7384a37c 234 FF ( d, a, b, c, in[ 5], S12, UL(1200080426)); /* 6 */
grzemich 0:d7bd7384a37c 235 FF ( c, d, a, b, in[ 6], S13, UL(2821735955)); /* 7 */
grzemich 0:d7bd7384a37c 236 FF ( b, c, d, a, in[ 7], S14, UL(4249261313)); /* 8 */
grzemich 0:d7bd7384a37c 237 FF ( a, b, c, d, in[ 8], S11, UL(1770035416)); /* 9 */
grzemich 0:d7bd7384a37c 238 FF ( d, a, b, c, in[ 9], S12, UL(2336552879)); /* 10 */
grzemich 0:d7bd7384a37c 239 FF ( c, d, a, b, in[10], S13, UL(4294925233)); /* 11 */
grzemich 0:d7bd7384a37c 240 FF ( b, c, d, a, in[11], S14, UL(2304563134)); /* 12 */
grzemich 0:d7bd7384a37c 241 FF ( a, b, c, d, in[12], S11, UL(1804603682)); /* 13 */
grzemich 0:d7bd7384a37c 242 FF ( d, a, b, c, in[13], S12, UL(4254626195)); /* 14 */
grzemich 0:d7bd7384a37c 243 FF ( c, d, a, b, in[14], S13, UL(2792965006)); /* 15 */
grzemich 0:d7bd7384a37c 244 FF ( b, c, d, a, in[15], S14, UL(1236535329)); /* 16 */
grzemich 0:d7bd7384a37c 245
grzemich 0:d7bd7384a37c 246 /* Round 2 */
grzemich 0:d7bd7384a37c 247 #define S21 5
grzemich 0:d7bd7384a37c 248 #define S22 9
grzemich 0:d7bd7384a37c 249 #define S23 14
grzemich 0:d7bd7384a37c 250 #define S24 20
grzemich 0:d7bd7384a37c 251 GG ( a, b, c, d, in[ 1], S21, UL(4129170786)); /* 17 */
grzemich 0:d7bd7384a37c 252 GG ( d, a, b, c, in[ 6], S22, UL(3225465664)); /* 18 */
grzemich 0:d7bd7384a37c 253 GG ( c, d, a, b, in[11], S23, UL( 643717713)); /* 19 */
grzemich 0:d7bd7384a37c 254 GG ( b, c, d, a, in[ 0], S24, UL(3921069994)); /* 20 */
grzemich 0:d7bd7384a37c 255 GG ( a, b, c, d, in[ 5], S21, UL(3593408605)); /* 21 */
grzemich 0:d7bd7384a37c 256 GG ( d, a, b, c, in[10], S22, UL( 38016083)); /* 22 */
grzemich 0:d7bd7384a37c 257 GG ( c, d, a, b, in[15], S23, UL(3634488961)); /* 23 */
grzemich 0:d7bd7384a37c 258 GG ( b, c, d, a, in[ 4], S24, UL(3889429448)); /* 24 */
grzemich 0:d7bd7384a37c 259 GG ( a, b, c, d, in[ 9], S21, UL( 568446438)); /* 25 */
grzemich 0:d7bd7384a37c 260 GG ( d, a, b, c, in[14], S22, UL(3275163606)); /* 26 */
grzemich 0:d7bd7384a37c 261 GG ( c, d, a, b, in[ 3], S23, UL(4107603335)); /* 27 */
grzemich 0:d7bd7384a37c 262 GG ( b, c, d, a, in[ 8], S24, UL(1163531501)); /* 28 */
grzemich 0:d7bd7384a37c 263 GG ( a, b, c, d, in[13], S21, UL(2850285829)); /* 29 */
grzemich 0:d7bd7384a37c 264 GG ( d, a, b, c, in[ 2], S22, UL(4243563512)); /* 30 */
grzemich 0:d7bd7384a37c 265 GG ( c, d, a, b, in[ 7], S23, UL(1735328473)); /* 31 */
grzemich 0:d7bd7384a37c 266 GG ( b, c, d, a, in[12], S24, UL(2368359562)); /* 32 */
grzemich 0:d7bd7384a37c 267
grzemich 0:d7bd7384a37c 268 /* Round 3 */
grzemich 0:d7bd7384a37c 269 #define S31 4
grzemich 0:d7bd7384a37c 270 #define S32 11
grzemich 0:d7bd7384a37c 271 #define S33 16
grzemich 0:d7bd7384a37c 272 #define S34 23
grzemich 0:d7bd7384a37c 273 HH ( a, b, c, d, in[ 5], S31, UL(4294588738)); /* 33 */
grzemich 0:d7bd7384a37c 274 HH ( d, a, b, c, in[ 8], S32, UL(2272392833)); /* 34 */
grzemich 0:d7bd7384a37c 275 HH ( c, d, a, b, in[11], S33, UL(1839030562)); /* 35 */
grzemich 0:d7bd7384a37c 276 HH ( b, c, d, a, in[14], S34, UL(4259657740)); /* 36 */
grzemich 0:d7bd7384a37c 277 HH ( a, b, c, d, in[ 1], S31, UL(2763975236)); /* 37 */
grzemich 0:d7bd7384a37c 278 HH ( d, a, b, c, in[ 4], S32, UL(1272893353)); /* 38 */
grzemich 0:d7bd7384a37c 279 HH ( c, d, a, b, in[ 7], S33, UL(4139469664)); /* 39 */
grzemich 0:d7bd7384a37c 280 HH ( b, c, d, a, in[10], S34, UL(3200236656)); /* 40 */
grzemich 0:d7bd7384a37c 281 HH ( a, b, c, d, in[13], S31, UL( 681279174)); /* 41 */
grzemich 0:d7bd7384a37c 282 HH ( d, a, b, c, in[ 0], S32, UL(3936430074)); /* 42 */
grzemich 0:d7bd7384a37c 283 HH ( c, d, a, b, in[ 3], S33, UL(3572445317)); /* 43 */
grzemich 0:d7bd7384a37c 284 HH ( b, c, d, a, in[ 6], S34, UL( 76029189)); /* 44 */
grzemich 0:d7bd7384a37c 285 HH ( a, b, c, d, in[ 9], S31, UL(3654602809)); /* 45 */
grzemich 0:d7bd7384a37c 286 HH ( d, a, b, c, in[12], S32, UL(3873151461)); /* 46 */
grzemich 0:d7bd7384a37c 287 HH ( c, d, a, b, in[15], S33, UL( 530742520)); /* 47 */
grzemich 0:d7bd7384a37c 288 HH ( b, c, d, a, in[ 2], S34, UL(3299628645)); /* 48 */
grzemich 0:d7bd7384a37c 289
grzemich 0:d7bd7384a37c 290 /* Round 4 */
grzemich 0:d7bd7384a37c 291 #define S41 6
grzemich 0:d7bd7384a37c 292 #define S42 10
grzemich 0:d7bd7384a37c 293 #define S43 15
grzemich 0:d7bd7384a37c 294 #define S44 21
grzemich 0:d7bd7384a37c 295 II ( a, b, c, d, in[ 0], S41, UL(4096336452)); /* 49 */
grzemich 0:d7bd7384a37c 296 II ( d, a, b, c, in[ 7], S42, UL(1126891415)); /* 50 */
grzemich 0:d7bd7384a37c 297 II ( c, d, a, b, in[14], S43, UL(2878612391)); /* 51 */
grzemich 0:d7bd7384a37c 298 II ( b, c, d, a, in[ 5], S44, UL(4237533241)); /* 52 */
grzemich 0:d7bd7384a37c 299 II ( a, b, c, d, in[12], S41, UL(1700485571)); /* 53 */
grzemich 0:d7bd7384a37c 300 II ( d, a, b, c, in[ 3], S42, UL(2399980690)); /* 54 */
grzemich 0:d7bd7384a37c 301 II ( c, d, a, b, in[10], S43, UL(4293915773)); /* 55 */
grzemich 0:d7bd7384a37c 302 II ( b, c, d, a, in[ 1], S44, UL(2240044497)); /* 56 */
grzemich 0:d7bd7384a37c 303 II ( a, b, c, d, in[ 8], S41, UL(1873313359)); /* 57 */
grzemich 0:d7bd7384a37c 304 II ( d, a, b, c, in[15], S42, UL(4264355552)); /* 58 */
grzemich 0:d7bd7384a37c 305 II ( c, d, a, b, in[ 6], S43, UL(2734768916)); /* 59 */
grzemich 0:d7bd7384a37c 306 II ( b, c, d, a, in[13], S44, UL(1309151649)); /* 60 */
grzemich 0:d7bd7384a37c 307 II ( a, b, c, d, in[ 4], S41, UL(4149444226)); /* 61 */
grzemich 0:d7bd7384a37c 308 II ( d, a, b, c, in[11], S42, UL(3174756917)); /* 62 */
grzemich 0:d7bd7384a37c 309 II ( c, d, a, b, in[ 2], S43, UL( 718787259)); /* 63 */
grzemich 0:d7bd7384a37c 310 II ( b, c, d, a, in[ 9], S44, UL(3951481745)); /* 64 */
grzemich 0:d7bd7384a37c 311
grzemich 0:d7bd7384a37c 312 buf[0] += a;
grzemich 0:d7bd7384a37c 313 buf[1] += b;
grzemich 0:d7bd7384a37c 314 buf[2] += c;
grzemich 0:d7bd7384a37c 315 buf[3] += d;
grzemich 0:d7bd7384a37c 316 }
grzemich 0:d7bd7384a37c 317
grzemich 0:d7bd7384a37c 318 #endif /* CHAP_SUPPORT || MD5_SUPPORT */
grzemich 0:d7bd7384a37c 319
grzemich 0:d7bd7384a37c 320 #endif /* PPP_SUPPORT */