Mercurial > dropbear

annotate libtomcrypt/src/encauth/ocb/ocb_done_decrypt.c @ 1902:4a6725ac957c

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Revert "Don't include sk keys at all in KEX list" This reverts git commit f972813ecdc7bb981d25b5a63638bd158f1c8e72. The sk algorithms need to remain in the sigalgs list so that they are included in the server-sig-algs ext-info message sent by the server. RFC8308 for server-sig-algs requires that all algorithms are listed (though OpenSSH client 8.4p1 tested doesn't require that)
author Matt Johnston <matt@ucc.asn.au>
date Thu, 24 Mar 2022 13:42:08 +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
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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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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 */
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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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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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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
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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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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: $Format:%ai$ */