Mercurial > dropbear

annotate libtomcrypt/src/encauth/ocb/ocb_decrypt_verify_memory.c @ 1715:3974f087d9c0

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Disallow leading lines before the ident for server (#102) Per RFC4253 4.2 clients must be able to process other lines of data before the version string, server behavior is not defined neither with MUST/SHOULD nor with MAY. If server process up to 50 lines too - it may cause too long hanging session with invalid/evil client that consume host resources and potentially may lead to DDoS on poor embedded boxes. Let's require first line from client to be version string and fail early if it's not - matches both RFC and real OpenSSH behavior.
author Vladislav Grishenko <themiron@users.noreply.github.com>
date Mon, 15 Jun 2020 18:22:18 +0500
parents 6dba84798cd5
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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_decrypt_verify_memory.c
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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12 OCB implementation, helper to decrypt block of memory, 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 Decrypt and compare the tag with OCB.
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20 @param cipher The index of the cipher desired
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21 @param key The secret key
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22 @param keylen The length of the secret key (octets)
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23 @param nonce The session nonce (length of the block size of the block cipher)
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24 @param ct The ciphertext
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25 @param ctlen The length of the ciphertext (octets)
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26 @param pt [out] The plaintext
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27 @param tag The tag to compare against
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28 @param taglen The length of the tag (octets)
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29 @param stat [out] The result of the tag comparison (1==valid, 0==invalid)
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30 @return CRYPT_OK if successful regardless of the tag comparison
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31 */
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32 int ocb_decrypt_verify_memory(int cipher,
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33 const unsigned char *key, unsigned long keylen,
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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34 const unsigned char *nonce,
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35 const unsigned char *ct, unsigned long ctlen,
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36 unsigned char *pt,
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37 const unsigned char *tag, unsigned long taglen,
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38 int *stat)
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39 {
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40 int err;
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41 ocb_state *ocb;
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42
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43 LTC_ARGCHK(key != NULL);
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44 LTC_ARGCHK(nonce != NULL);
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45 LTC_ARGCHK(pt != NULL);
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46 LTC_ARGCHK(ct != NULL);
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47 LTC_ARGCHK(tag != NULL);
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48 LTC_ARGCHK(stat != NULL);
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49
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50 /* allocate memory */
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51 ocb = XMALLOC(sizeof(ocb_state));
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52 if (ocb == NULL) {
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53 return CRYPT_MEM;
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54 }
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55
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56 if ((err = ocb_init(ocb, cipher, key, keylen, nonce)) != CRYPT_OK) {
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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57 goto LBL_ERR;
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58 }
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59
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60 while (ctlen > (unsigned long)ocb->block_len) {
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61 if ((err = ocb_decrypt(ocb, ct, pt)) != CRYPT_OK) {
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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62 goto LBL_ERR;
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63 }
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64 ctlen -= ocb->block_len;
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65 pt += ocb->block_len;
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66 ct += ocb->block_len;
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67 }
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68
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69 err = ocb_done_decrypt(ocb, ct, ctlen, pt, tag, taglen, stat);
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70 LBL_ERR:
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71 #ifdef LTC_CLEAN_STACK
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72 zeromem(ocb, sizeof(ocb_state));
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73 #endif
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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74
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75 XFREE(ocb);
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76
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77 return err;
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78 }
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79
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80 #endif
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81
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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82 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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83 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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84 /* commit time: $Format:%ai$ */