Mercurial > dropbear

annotate libtomcrypt/src/encauth/ocb/ocb_done_decrypt.c @ 1857:6022df862942

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Use DSCP for IP QoS traffic classes The previous TOS values are deprecated and not used by modern traffic classifiers. This sets AF21 for "interactive" traffic (with a tty). Non-tty traffic sets AF11 - that indicates high throughput but is not lowest priority (which would be CS1 or LE). This differs from the CS1 used by OpenSSH, it lets interactive git over SSH have higher priority than background least effort traffic. Dropbear's settings here should be suitable with the diffservs used by CAKE qdisc.
author Matt Johnston <matt@ucc.asn.au>
date Tue, 25 Jan 2022 17:32:20 +0800
parents 6dba84798cd5
children
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
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2 *
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3 * LibTomCrypt is a library that provides various cryptographic
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4 * algorithms in a highly modular and flexible manner.
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5 *
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6 * The library is free for all purposes without any express
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7 * guarantee it works.
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8 */
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9
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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10 /**
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11 @file ocb_done_decrypt.c
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12 OCB implementation, terminate decryption, by Tom St Denis
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13 */
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14 #include "tomcrypt.h"
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15
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f849a5ca2efc update to libtomcrypt 1.17 (with Dropbear changes)
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16 #ifdef LTC_OCB_MODE
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18 /**
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19 Terminate a decrypting OCB state
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20 @param ocb The OCB state
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21 @param ct The ciphertext (if any)
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22 @param ctlen The length of the ciphertext (octets)
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23 @param pt [out] The plaintext
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24 @param tag The authentication tag (to compare against)
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25 @param taglen The length of the authentication tag provided
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26 @param stat [out] The result of the tag comparison
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27 @return CRYPT_OK if the process was successful regardless if the tag is valid
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28 */
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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29 int ocb_done_decrypt(ocb_state *ocb,
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30 const unsigned char *ct, unsigned long ctlen,
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31 unsigned char *pt,
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32 const unsigned char *tag, unsigned long taglen, int *stat)
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33 {
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34 int err;
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35 unsigned char *tagbuf;
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36 unsigned long tagbuflen;
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37
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38 LTC_ARGCHK(ocb != NULL);
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39 LTC_ARGCHK(pt != NULL);
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40 LTC_ARGCHK(ct != NULL);
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41 LTC_ARGCHK(tag != NULL);
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42 LTC_ARGCHK(stat != NULL);
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44 /* default to failed */
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45 *stat = 0;
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46
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47 /* allocate memory */
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48 tagbuf = XMALLOC(MAXBLOCKSIZE);
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49 if (tagbuf == NULL) {
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50 return CRYPT_MEM;
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51 }
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52
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53 tagbuflen = MAXBLOCKSIZE;
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54 if ((err = s_ocb_done(ocb, ct, ctlen, pt, tagbuf, &tagbuflen, 1)) != CRYPT_OK) {
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55 goto LBL_ERR;
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56 }
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57
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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58 if (taglen <= tagbuflen && XMEM_NEQ(tagbuf, tag, taglen) == 0) {
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59 *stat = 1;
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60 }
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62 err = CRYPT_OK;
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63 LBL_ERR:
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64 #ifdef LTC_CLEAN_STACK
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65 zeromem(tagbuf, MAXBLOCKSIZE);
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66 #endif
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67
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68 XFREE(tagbuf);
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69
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70 return err;
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71 }
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73 #endif
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75
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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76 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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77 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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78 /* commit time: $Format:%ai$ */