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annotate src/md5/hmac_md5.c @ 91:3e7136221104

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correct masqmail path in rmail script; remove docs on uninstall on install the correct path to the masqmail executable gets inserted into the rmail script now. now documentation, examples, and the templates are removed on uninstall. Empty directories are the only thing that may remain if one installs masqmail into an unusual path.
author meillo@marmaro.de
date Mon, 21 Jun 2010 09:40:16 +0200
parents 26e34ae9a3e3
children 10da50168dab
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08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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1 /*
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2 ** Function: hmac_md5
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3 */
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4
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5 #include <string.h>
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6 #include "global.h"
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7 #include "md5.h"
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8 #include "hmac_md5.h"
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10 void
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11 hmac_md5(unsigned char *text, int text_len, unsigned char *key, int key_len, unsigned char *digest)
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12 /* text; pointer to data stream */
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13 /* text_len; length of data stream */
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14 /* key; pointer to authentication key */
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15 /* key_len; length of authentication key */
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16 /* digest; caller digest to be filled in */
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17 {
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18 MD5_CTX context;
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19 unsigned char k_ipad[65]; /* inner padding - key XORd with ipad */
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20 unsigned char k_opad[65]; /* outer padding - key XORd with opad */
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21 unsigned char tk[16];
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22 int i;
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23 /* if key is longer than 64 bytes reset it to key=MD5(key) */
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24 if (key_len > 64) {
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26 MD5_CTX tctx;
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28 MD5Init(&tctx);
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29 MD5Update(&tctx, key, key_len);
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30 MD5Final(tk, &tctx);
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32 key = tk;
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33 key_len = 16;
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34 }
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36 /*
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37 * the HMAC_MD5 transform looks like:
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38 *
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39 * MD5(K XOR opad, MD5(K XOR ipad, text))
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40 *
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41 * where K is an n byte key
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42 * ipad is the byte 0x36 repeated 64 times
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43 * opad is the byte 0x5c repeated 64 times
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44 * and text is the data being protected
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45 */
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46
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47 /* start out by storing key in pads */
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48 bzero(k_ipad, sizeof k_ipad);
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49 bzero(k_opad, sizeof k_opad);
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50 bcopy(key, k_ipad, key_len);
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51 bcopy(key, k_opad, key_len);
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53 /* XOR key with ipad and opad values */
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54 for (i = 0; i < 64; i++) {
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55 k_ipad[i] ^= 0x36;
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56 k_opad[i] ^= 0x5c;
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57 }
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58 /*
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59 * perform inner MD5
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60 */
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61 MD5Init(&context); /* init context for 1st pass */
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62 MD5Update(&context, k_ipad, 64); /* start with inner pad */
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63 MD5Update(&context, text, text_len); /* then text of datagram */
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64 MD5Final(digest, &context); /* finish up 1st pass */
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65 /*
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66 * perform outer MD5
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67 */
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68 MD5Init(&context); /* init context for 2nd pass */
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69 MD5Update(&context, k_opad, 64); /* start with outer pad */
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70 MD5Update(&context, digest, 16); /* then results of 1st hash */
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71 MD5Final(digest, &context); /* finish up 2nd pass */
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72 }