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lwip/netif/ppp/md5.c@0:b2805b6888dc, 2016-06-20 (annotated)

Committer:
robert_jw
Date:
Mon Jun 20 01:40:20 2016 +0000
Revision:
0:b2805b6888dc
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robert_jw 0:b2805b6888dc 1 /*
robert_jw 0:b2805b6888dc 2 ***********************************************************************
robert_jw 0:b2805b6888dc 3 ** md5.c -- the source code for MD5 routines **
robert_jw 0:b2805b6888dc 4 ** RSA Data Security, Inc. MD5 Message-Digest Algorithm **
robert_jw 0:b2805b6888dc 5 ** Created: 2/17/90 RLR **
robert_jw 0:b2805b6888dc 6 ** Revised: 1/91 SRD,AJ,BSK,JT Reference C ver., 7/10 constant corr. **
robert_jw 0:b2805b6888dc 7 ***********************************************************************
robert_jw 0:b2805b6888dc 8 */
robert_jw 0:b2805b6888dc 9
robert_jw 0:b2805b6888dc 10 /*
robert_jw 0:b2805b6888dc 11 ***********************************************************************
robert_jw 0:b2805b6888dc 12 ** Copyright (C) 1990, RSA Data Security, Inc. All rights reserved. **
robert_jw 0:b2805b6888dc 13 ** **
robert_jw 0:b2805b6888dc 14 ** License to copy and use this software is granted provided that **
robert_jw 0:b2805b6888dc 15 ** it is identified as the "RSA Data Security, Inc. MD5 Message- **
robert_jw 0:b2805b6888dc 16 ** Digest Algorithm" in all material mentioning or referencing this **
robert_jw 0:b2805b6888dc 17 ** software or this function. **
robert_jw 0:b2805b6888dc 18 ** **
robert_jw 0:b2805b6888dc 19 ** License is also granted to make and use derivative works **
robert_jw 0:b2805b6888dc 20 ** provided that such works are identified as "derived from the RSA **
robert_jw 0:b2805b6888dc 21 ** Data Security, Inc. MD5 Message-Digest Algorithm" in all **
robert_jw 0:b2805b6888dc 22 ** material mentioning or referencing the derived work. **
robert_jw 0:b2805b6888dc 23 ** **
robert_jw 0:b2805b6888dc 24 ** RSA Data Security, Inc. makes no representations concerning **
robert_jw 0:b2805b6888dc 25 ** either the merchantability of this software or the suitability **
robert_jw 0:b2805b6888dc 26 ** of this software for any particular purpose. It is provided "as **
robert_jw 0:b2805b6888dc 27 ** is" without express or implied warranty of any kind. **
robert_jw 0:b2805b6888dc 28 ** **
robert_jw 0:b2805b6888dc 29 ** These notices must be retained in any copies of any part of this **
robert_jw 0:b2805b6888dc 30 ** documentation and/or software. **
robert_jw 0:b2805b6888dc 31 ***********************************************************************
robert_jw 0:b2805b6888dc 32 */
robert_jw 0:b2805b6888dc 33
robert_jw 0:b2805b6888dc 34 #include "lwip/opt.h"
robert_jw 0:b2805b6888dc 35
robert_jw 0:b2805b6888dc 36 #if PPP_SUPPORT /* don't build if not configured for use in lwipopts.h */
robert_jw 0:b2805b6888dc 37
robert_jw 0:b2805b6888dc 38 #if CHAP_SUPPORT || MD5_SUPPORT
robert_jw 0:b2805b6888dc 39
robert_jw 0:b2805b6888dc 40 #include "ppp.h"
robert_jw 0:b2805b6888dc 41 #include "pppdebug.h"
robert_jw 0:b2805b6888dc 42
robert_jw 0:b2805b6888dc 43 #include "md5.h"
robert_jw 0:b2805b6888dc 44
robert_jw 0:b2805b6888dc 45 #include <string.h>
robert_jw 0:b2805b6888dc 46
robert_jw 0:b2805b6888dc 47 /*
robert_jw 0:b2805b6888dc 48 ***********************************************************************
robert_jw 0:b2805b6888dc 49 ** Message-digest routines: **
robert_jw 0:b2805b6888dc 50 ** To form the message digest for a message M **
robert_jw 0:b2805b6888dc 51 ** (1) Initialize a context buffer mdContext using MD5Init **
robert_jw 0:b2805b6888dc 52 ** (2) Call MD5Update on mdContext and M **
robert_jw 0:b2805b6888dc 53 ** (3) Call MD5Final on mdContext **
robert_jw 0:b2805b6888dc 54 ** The message digest is now in mdContext->digest[0...15] **
robert_jw 0:b2805b6888dc 55 ***********************************************************************
robert_jw 0:b2805b6888dc 56 */
robert_jw 0:b2805b6888dc 57
robert_jw 0:b2805b6888dc 58 /* forward declaration */
robert_jw 0:b2805b6888dc 59 static void Transform (u32_t *buf, u32_t *in);
robert_jw 0:b2805b6888dc 60
robert_jw 0:b2805b6888dc 61 static unsigned char PADDING[64] = {
robert_jw 0:b2805b6888dc 62 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
robert_jw 0:b2805b6888dc 63 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
robert_jw 0:b2805b6888dc 64 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
robert_jw 0:b2805b6888dc 65 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
robert_jw 0:b2805b6888dc 66 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
robert_jw 0:b2805b6888dc 67 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
robert_jw 0:b2805b6888dc 68 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
robert_jw 0:b2805b6888dc 69 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
robert_jw 0:b2805b6888dc 70 };
robert_jw 0:b2805b6888dc 71
robert_jw 0:b2805b6888dc 72 /* F, G, H and I are basic MD5 functions */
robert_jw 0:b2805b6888dc 73 #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
robert_jw 0:b2805b6888dc 74 #define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
robert_jw 0:b2805b6888dc 75 #define H(x, y, z) ((x) ^ (y) ^ (z))
robert_jw 0:b2805b6888dc 76 #define I(x, y, z) ((y) ^ ((x) | (~z)))
robert_jw 0:b2805b6888dc 77
robert_jw 0:b2805b6888dc 78 /* ROTATE_LEFT rotates x left n bits */
robert_jw 0:b2805b6888dc 79 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
robert_jw 0:b2805b6888dc 80
robert_jw 0:b2805b6888dc 81 /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4 */
robert_jw 0:b2805b6888dc 82 /* Rotation is separate from addition to prevent recomputation */
robert_jw 0:b2805b6888dc 83 #define FF(a, b, c, d, x, s, ac) \
robert_jw 0:b2805b6888dc 84 {(a) += F ((b), (c), (d)) + (x) + (u32_t)(ac); \
robert_jw 0:b2805b6888dc 85 (a) = ROTATE_LEFT ((a), (s)); \
robert_jw 0:b2805b6888dc 86 (a) += (b); \
robert_jw 0:b2805b6888dc 87 }
robert_jw 0:b2805b6888dc 88 #define GG(a, b, c, d, x, s, ac) \
robert_jw 0:b2805b6888dc 89 {(a) += G ((b), (c), (d)) + (x) + (u32_t)(ac); \
robert_jw 0:b2805b6888dc 90 (a) = ROTATE_LEFT ((a), (s)); \
robert_jw 0:b2805b6888dc 91 (a) += (b); \
robert_jw 0:b2805b6888dc 92 }
robert_jw 0:b2805b6888dc 93 #define HH(a, b, c, d, x, s, ac) \
robert_jw 0:b2805b6888dc 94 {(a) += H ((b), (c), (d)) + (x) + (u32_t)(ac); \
robert_jw 0:b2805b6888dc 95 (a) = ROTATE_LEFT ((a), (s)); \
robert_jw 0:b2805b6888dc 96 (a) += (b); \
robert_jw 0:b2805b6888dc 97 }
robert_jw 0:b2805b6888dc 98 #define II(a, b, c, d, x, s, ac) \
robert_jw 0:b2805b6888dc 99 {(a) += I ((b), (c), (d)) + (x) + (u32_t)(ac); \
robert_jw 0:b2805b6888dc 100 (a) = ROTATE_LEFT ((a), (s)); \
robert_jw 0:b2805b6888dc 101 (a) += (b); \
robert_jw 0:b2805b6888dc 102 }
robert_jw 0:b2805b6888dc 103
robert_jw 0:b2805b6888dc 104 #ifdef __STDC__
robert_jw 0:b2805b6888dc 105 #define UL(x) x##UL
robert_jw 0:b2805b6888dc 106 #else
robert_jw 0:b2805b6888dc 107 #ifdef WIN32
robert_jw 0:b2805b6888dc 108 #define UL(x) x##UL
robert_jw 0:b2805b6888dc 109 #else
robert_jw 0:b2805b6888dc 110 #define UL(x) x
robert_jw 0:b2805b6888dc 111 #endif
robert_jw 0:b2805b6888dc 112 #endif
robert_jw 0:b2805b6888dc 113
robert_jw 0:b2805b6888dc 114 /* The routine MD5Init initializes the message-digest context
robert_jw 0:b2805b6888dc 115 mdContext. All fields are set to zero.
robert_jw 0:b2805b6888dc 116 */
robert_jw 0:b2805b6888dc 117 void
robert_jw 0:b2805b6888dc 118 MD5Init (MD5_CTX *mdContext)
robert_jw 0:b2805b6888dc 119 {
robert_jw 0:b2805b6888dc 120 mdContext->i[0] = mdContext->i[1] = (u32_t)0;
robert_jw 0:b2805b6888dc 121
robert_jw 0:b2805b6888dc 122 /* Load magic initialization constants. */
robert_jw 0:b2805b6888dc 123 mdContext->buf[0] = (u32_t)0x67452301UL;
robert_jw 0:b2805b6888dc 124 mdContext->buf[1] = (u32_t)0xefcdab89UL;
robert_jw 0:b2805b6888dc 125 mdContext->buf[2] = (u32_t)0x98badcfeUL;
robert_jw 0:b2805b6888dc 126 mdContext->buf[3] = (u32_t)0x10325476UL;
robert_jw 0:b2805b6888dc 127 }
robert_jw 0:b2805b6888dc 128
robert_jw 0:b2805b6888dc 129 /* The routine MD5Update updates the message-digest context to
robert_jw 0:b2805b6888dc 130 account for the presence of each of the characters inBuf[0..inLen-1]
robert_jw 0:b2805b6888dc 131 in the message whose digest is being computed.
robert_jw 0:b2805b6888dc 132 */
robert_jw 0:b2805b6888dc 133 void
robert_jw 0:b2805b6888dc 134 MD5Update(MD5_CTX *mdContext, unsigned char *inBuf, unsigned int inLen)
robert_jw 0:b2805b6888dc 135 {
robert_jw 0:b2805b6888dc 136 u32_t in[16];
robert_jw 0:b2805b6888dc 137 int mdi;
robert_jw 0:b2805b6888dc 138 unsigned int i, ii;
robert_jw 0:b2805b6888dc 139
robert_jw 0:b2805b6888dc 140 #if 0
robert_jw 0:b2805b6888dc 141 PPPDEBUG(LOG_INFO, ("MD5Update: %u:%.*H\n", inLen, LWIP_MIN(inLen, 20) * 2, inBuf));
robert_jw 0:b2805b6888dc 142 PPPDEBUG(LOG_INFO, ("MD5Update: %u:%s\n", inLen, inBuf));
robert_jw 0:b2805b6888dc 143 #endif
robert_jw 0:b2805b6888dc 144
robert_jw 0:b2805b6888dc 145 /* compute number of bytes mod 64 */
robert_jw 0:b2805b6888dc 146 mdi = (int)((mdContext->i[0] >> 3) & 0x3F);
robert_jw 0:b2805b6888dc 147
robert_jw 0:b2805b6888dc 148 /* update number of bits */
robert_jw 0:b2805b6888dc 149 if ((mdContext->i[0] + ((u32_t)inLen << 3)) < mdContext->i[0]) {
robert_jw 0:b2805b6888dc 150 mdContext->i[1]++;
robert_jw 0:b2805b6888dc 151 }
robert_jw 0:b2805b6888dc 152 mdContext->i[0] += ((u32_t)inLen << 3);
robert_jw 0:b2805b6888dc 153 mdContext->i[1] += ((u32_t)inLen >> 29);
robert_jw 0:b2805b6888dc 154
robert_jw 0:b2805b6888dc 155 while (inLen--) {
robert_jw 0:b2805b6888dc 156 /* add new character to buffer, increment mdi */
robert_jw 0:b2805b6888dc 157 mdContext->in[mdi++] = *inBuf++;
robert_jw 0:b2805b6888dc 158
robert_jw 0:b2805b6888dc 159 /* transform if necessary */
robert_jw 0:b2805b6888dc 160 if (mdi == 0x40) {
robert_jw 0:b2805b6888dc 161 for (i = 0, ii = 0; i < 16; i++, ii += 4) {
robert_jw 0:b2805b6888dc 162 in[i] = (((u32_t)mdContext->in[ii+3]) << 24) |
robert_jw 0:b2805b6888dc 163 (((u32_t)mdContext->in[ii+2]) << 16) |
robert_jw 0:b2805b6888dc 164 (((u32_t)mdContext->in[ii+1]) << 8) |
robert_jw 0:b2805b6888dc 165 ((u32_t)mdContext->in[ii]);
robert_jw 0:b2805b6888dc 166 }
robert_jw 0:b2805b6888dc 167 Transform (mdContext->buf, in);
robert_jw 0:b2805b6888dc 168 mdi = 0;
robert_jw 0:b2805b6888dc 169 }
robert_jw 0:b2805b6888dc 170 }
robert_jw 0:b2805b6888dc 171 }
robert_jw 0:b2805b6888dc 172
robert_jw 0:b2805b6888dc 173 /* The routine MD5Final terminates the message-digest computation and
robert_jw 0:b2805b6888dc 174 ends with the desired message digest in mdContext->digest[0...15].
robert_jw 0:b2805b6888dc 175 */
robert_jw 0:b2805b6888dc 176 void
robert_jw 0:b2805b6888dc 177 MD5Final (unsigned char hash[], MD5_CTX *mdContext)
robert_jw 0:b2805b6888dc 178 {
robert_jw 0:b2805b6888dc 179 u32_t in[16];
robert_jw 0:b2805b6888dc 180 int mdi;
robert_jw 0:b2805b6888dc 181 unsigned int i, ii;
robert_jw 0:b2805b6888dc 182 unsigned int padLen;
robert_jw 0:b2805b6888dc 183
robert_jw 0:b2805b6888dc 184 /* save number of bits */
robert_jw 0:b2805b6888dc 185 in[14] = mdContext->i[0];
robert_jw 0:b2805b6888dc 186 in[15] = mdContext->i[1];
robert_jw 0:b2805b6888dc 187
robert_jw 0:b2805b6888dc 188 /* compute number of bytes mod 64 */
robert_jw 0:b2805b6888dc 189 mdi = (int)((mdContext->i[0] >> 3) & 0x3F);
robert_jw 0:b2805b6888dc 190
robert_jw 0:b2805b6888dc 191 /* pad out to 56 mod 64 */
robert_jw 0:b2805b6888dc 192 padLen = (mdi < 56) ? (56 - mdi) : (120 - mdi);
robert_jw 0:b2805b6888dc 193 MD5Update (mdContext, PADDING, padLen);
robert_jw 0:b2805b6888dc 194
robert_jw 0:b2805b6888dc 195 /* append length in bits and transform */
robert_jw 0:b2805b6888dc 196 for (i = 0, ii = 0; i < 14; i++, ii += 4) {
robert_jw 0:b2805b6888dc 197 in[i] = (((u32_t)mdContext->in[ii+3]) << 24) |
robert_jw 0:b2805b6888dc 198 (((u32_t)mdContext->in[ii+2]) << 16) |
robert_jw 0:b2805b6888dc 199 (((u32_t)mdContext->in[ii+1]) << 8) |
robert_jw 0:b2805b6888dc 200 ((u32_t)mdContext->in[ii]);
robert_jw 0:b2805b6888dc 201 }
robert_jw 0:b2805b6888dc 202 Transform (mdContext->buf, in);
robert_jw 0:b2805b6888dc 203
robert_jw 0:b2805b6888dc 204 /* store buffer in digest */
robert_jw 0:b2805b6888dc 205 for (i = 0, ii = 0; i < 4; i++, ii += 4) {
robert_jw 0:b2805b6888dc 206 mdContext->digest[ii] = (unsigned char)(mdContext->buf[i] & 0xFF);
robert_jw 0:b2805b6888dc 207 mdContext->digest[ii+1] =
robert_jw 0:b2805b6888dc 208 (unsigned char)((mdContext->buf[i] >> 8) & 0xFF);
robert_jw 0:b2805b6888dc 209 mdContext->digest[ii+2] =
robert_jw 0:b2805b6888dc 210 (unsigned char)((mdContext->buf[i] >> 16) & 0xFF);
robert_jw 0:b2805b6888dc 211 mdContext->digest[ii+3] =
robert_jw 0:b2805b6888dc 212 (unsigned char)((mdContext->buf[i] >> 24) & 0xFF);
robert_jw 0:b2805b6888dc 213 }
robert_jw 0:b2805b6888dc 214 SMEMCPY(hash, mdContext->digest, 16);
robert_jw 0:b2805b6888dc 215 }
robert_jw 0:b2805b6888dc 216
robert_jw 0:b2805b6888dc 217 /* Basic MD5 step. Transforms buf based on in.
robert_jw 0:b2805b6888dc 218 */
robert_jw 0:b2805b6888dc 219 static void
robert_jw 0:b2805b6888dc 220 Transform (u32_t *buf, u32_t *in)
robert_jw 0:b2805b6888dc 221 {
robert_jw 0:b2805b6888dc 222 u32_t a = buf[0], b = buf[1], c = buf[2], d = buf[3];
robert_jw 0:b2805b6888dc 223
robert_jw 0:b2805b6888dc 224 /* Round 1 */
robert_jw 0:b2805b6888dc 225 #define S11 7
robert_jw 0:b2805b6888dc 226 #define S12 12
robert_jw 0:b2805b6888dc 227 #define S13 17
robert_jw 0:b2805b6888dc 228 #define S14 22
robert_jw 0:b2805b6888dc 229 FF ( a, b, c, d, in[ 0], S11, UL(3614090360)); /* 1 */
robert_jw 0:b2805b6888dc 230 FF ( d, a, b, c, in[ 1], S12, UL(3905402710)); /* 2 */
robert_jw 0:b2805b6888dc 231 FF ( c, d, a, b, in[ 2], S13, UL( 606105819)); /* 3 */
robert_jw 0:b2805b6888dc 232 FF ( b, c, d, a, in[ 3], S14, UL(3250441966)); /* 4 */
robert_jw 0:b2805b6888dc 233 FF ( a, b, c, d, in[ 4], S11, UL(4118548399)); /* 5 */
robert_jw 0:b2805b6888dc 234 FF ( d, a, b, c, in[ 5], S12, UL(1200080426)); /* 6 */
robert_jw 0:b2805b6888dc 235 FF ( c, d, a, b, in[ 6], S13, UL(2821735955)); /* 7 */
robert_jw 0:b2805b6888dc 236 FF ( b, c, d, a, in[ 7], S14, UL(4249261313)); /* 8 */
robert_jw 0:b2805b6888dc 237 FF ( a, b, c, d, in[ 8], S11, UL(1770035416)); /* 9 */
robert_jw 0:b2805b6888dc 238 FF ( d, a, b, c, in[ 9], S12, UL(2336552879)); /* 10 */
robert_jw 0:b2805b6888dc 239 FF ( c, d, a, b, in[10], S13, UL(4294925233)); /* 11 */
robert_jw 0:b2805b6888dc 240 FF ( b, c, d, a, in[11], S14, UL(2304563134)); /* 12 */
robert_jw 0:b2805b6888dc 241 FF ( a, b, c, d, in[12], S11, UL(1804603682)); /* 13 */
robert_jw 0:b2805b6888dc 242 FF ( d, a, b, c, in[13], S12, UL(4254626195)); /* 14 */
robert_jw 0:b2805b6888dc 243 FF ( c, d, a, b, in[14], S13, UL(2792965006)); /* 15 */
robert_jw 0:b2805b6888dc 244 FF ( b, c, d, a, in[15], S14, UL(1236535329)); /* 16 */
robert_jw 0:b2805b6888dc 245
robert_jw 0:b2805b6888dc 246 /* Round 2 */
robert_jw 0:b2805b6888dc 247 #define S21 5
robert_jw 0:b2805b6888dc 248 #define S22 9
robert_jw 0:b2805b6888dc 249 #define S23 14
robert_jw 0:b2805b6888dc 250 #define S24 20
robert_jw 0:b2805b6888dc 251 GG ( a, b, c, d, in[ 1], S21, UL(4129170786)); /* 17 */
robert_jw 0:b2805b6888dc 252 GG ( d, a, b, c, in[ 6], S22, UL(3225465664)); /* 18 */
robert_jw 0:b2805b6888dc 253 GG ( c, d, a, b, in[11], S23, UL( 643717713)); /* 19 */
robert_jw 0:b2805b6888dc 254 GG ( b, c, d, a, in[ 0], S24, UL(3921069994)); /* 20 */
robert_jw 0:b2805b6888dc 255 GG ( a, b, c, d, in[ 5], S21, UL(3593408605)); /* 21 */
robert_jw 0:b2805b6888dc 256 GG ( d, a, b, c, in[10], S22, UL( 38016083)); /* 22 */
robert_jw 0:b2805b6888dc 257 GG ( c, d, a, b, in[15], S23, UL(3634488961)); /* 23 */
robert_jw 0:b2805b6888dc 258 GG ( b, c, d, a, in[ 4], S24, UL(3889429448)); /* 24 */
robert_jw 0:b2805b6888dc 259 GG ( a, b, c, d, in[ 9], S21, UL( 568446438)); /* 25 */
robert_jw 0:b2805b6888dc 260 GG ( d, a, b, c, in[14], S22, UL(3275163606)); /* 26 */
robert_jw 0:b2805b6888dc 261 GG ( c, d, a, b, in[ 3], S23, UL(4107603335)); /* 27 */
robert_jw 0:b2805b6888dc 262 GG ( b, c, d, a, in[ 8], S24, UL(1163531501)); /* 28 */
robert_jw 0:b2805b6888dc 263 GG ( a, b, c, d, in[13], S21, UL(2850285829)); /* 29 */
robert_jw 0:b2805b6888dc 264 GG ( d, a, b, c, in[ 2], S22, UL(4243563512)); /* 30 */
robert_jw 0:b2805b6888dc 265 GG ( c, d, a, b, in[ 7], S23, UL(1735328473)); /* 31 */
robert_jw 0:b2805b6888dc 266 GG ( b, c, d, a, in[12], S24, UL(2368359562)); /* 32 */
robert_jw 0:b2805b6888dc 267
robert_jw 0:b2805b6888dc 268 /* Round 3 */
robert_jw 0:b2805b6888dc 269 #define S31 4
robert_jw 0:b2805b6888dc 270 #define S32 11
robert_jw 0:b2805b6888dc 271 #define S33 16
robert_jw 0:b2805b6888dc 272 #define S34 23
robert_jw 0:b2805b6888dc 273 HH ( a, b, c, d, in[ 5], S31, UL(4294588738)); /* 33 */
robert_jw 0:b2805b6888dc 274 HH ( d, a, b, c, in[ 8], S32, UL(2272392833)); /* 34 */
robert_jw 0:b2805b6888dc 275 HH ( c, d, a, b, in[11], S33, UL(1839030562)); /* 35 */
robert_jw 0:b2805b6888dc 276 HH ( b, c, d, a, in[14], S34, UL(4259657740)); /* 36 */
robert_jw 0:b2805b6888dc 277 HH ( a, b, c, d, in[ 1], S31, UL(2763975236)); /* 37 */
robert_jw 0:b2805b6888dc 278 HH ( d, a, b, c, in[ 4], S32, UL(1272893353)); /* 38 */
robert_jw 0:b2805b6888dc 279 HH ( c, d, a, b, in[ 7], S33, UL(4139469664)); /* 39 */
robert_jw 0:b2805b6888dc 280 HH ( b, c, d, a, in[10], S34, UL(3200236656)); /* 40 */
robert_jw 0:b2805b6888dc 281 HH ( a, b, c, d, in[13], S31, UL( 681279174)); /* 41 */
robert_jw 0:b2805b6888dc 282 HH ( d, a, b, c, in[ 0], S32, UL(3936430074)); /* 42 */
robert_jw 0:b2805b6888dc 283 HH ( c, d, a, b, in[ 3], S33, UL(3572445317)); /* 43 */
robert_jw 0:b2805b6888dc 284 HH ( b, c, d, a, in[ 6], S34, UL( 76029189)); /* 44 */
robert_jw 0:b2805b6888dc 285 HH ( a, b, c, d, in[ 9], S31, UL(3654602809)); /* 45 */
robert_jw 0:b2805b6888dc 286 HH ( d, a, b, c, in[12], S32, UL(3873151461)); /* 46 */
robert_jw 0:b2805b6888dc 287 HH ( c, d, a, b, in[15], S33, UL( 530742520)); /* 47 */
robert_jw 0:b2805b6888dc 288 HH ( b, c, d, a, in[ 2], S34, UL(3299628645)); /* 48 */
robert_jw 0:b2805b6888dc 289
robert_jw 0:b2805b6888dc 290 /* Round 4 */
robert_jw 0:b2805b6888dc 291 #define S41 6
robert_jw 0:b2805b6888dc 292 #define S42 10
robert_jw 0:b2805b6888dc 293 #define S43 15
robert_jw 0:b2805b6888dc 294 #define S44 21
robert_jw 0:b2805b6888dc 295 II ( a, b, c, d, in[ 0], S41, UL(4096336452)); /* 49 */
robert_jw 0:b2805b6888dc 296 II ( d, a, b, c, in[ 7], S42, UL(1126891415)); /* 50 */
robert_jw 0:b2805b6888dc 297 II ( c, d, a, b, in[14], S43, UL(2878612391)); /* 51 */
robert_jw 0:b2805b6888dc 298 II ( b, c, d, a, in[ 5], S44, UL(4237533241)); /* 52 */
robert_jw 0:b2805b6888dc 299 II ( a, b, c, d, in[12], S41, UL(1700485571)); /* 53 */
robert_jw 0:b2805b6888dc 300 II ( d, a, b, c, in[ 3], S42, UL(2399980690)); /* 54 */
robert_jw 0:b2805b6888dc 301 II ( c, d, a, b, in[10], S43, UL(4293915773)); /* 55 */
robert_jw 0:b2805b6888dc 302 II ( b, c, d, a, in[ 1], S44, UL(2240044497)); /* 56 */
robert_jw 0:b2805b6888dc 303 II ( a, b, c, d, in[ 8], S41, UL(1873313359)); /* 57 */
robert_jw 0:b2805b6888dc 304 II ( d, a, b, c, in[15], S42, UL(4264355552)); /* 58 */
robert_jw 0:b2805b6888dc 305 II ( c, d, a, b, in[ 6], S43, UL(2734768916)); /* 59 */
robert_jw 0:b2805b6888dc 306 II ( b, c, d, a, in[13], S44, UL(1309151649)); /* 60 */
robert_jw 0:b2805b6888dc 307 II ( a, b, c, d, in[ 4], S41, UL(4149444226)); /* 61 */
robert_jw 0:b2805b6888dc 308 II ( d, a, b, c, in[11], S42, UL(3174756917)); /* 62 */
robert_jw 0:b2805b6888dc 309 II ( c, d, a, b, in[ 2], S43, UL( 718787259)); /* 63 */
robert_jw 0:b2805b6888dc 310 II ( b, c, d, a, in[ 9], S44, UL(3951481745)); /* 64 */
robert_jw 0:b2805b6888dc 311
robert_jw 0:b2805b6888dc 312 buf[0] += a;
robert_jw 0:b2805b6888dc 313 buf[1] += b;
robert_jw 0:b2805b6888dc 314 buf[2] += c;
robert_jw 0:b2805b6888dc 315 buf[3] += d;
robert_jw 0:b2805b6888dc 316 }
robert_jw 0:b2805b6888dc 317
robert_jw 0:b2805b6888dc 318 #endif /* CHAP_SUPPORT || MD5_SUPPORT */
robert_jw 0:b2805b6888dc 319
robert_jw 0:b2805b6888dc 320 #endif /* PPP_SUPPORT */