Mercurial > dropbear

annotate libtomcrypt/src/encauth/chachapoly/chacha20poly1305_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
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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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10 #include "tomcrypt.h"
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11
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12 #ifdef LTC_CHACHA20POLY1305_MODE
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13
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14 /**
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15 Process an entire GCM packet in one call.
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16 @param key The secret key
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17 @param keylen The length of the secret key
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18 @param iv The initialization vector
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19 @param ivlen The length of the initialization vector
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20 @param aad The additional authentication data (header)
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21 @param aadlen The length of the aad
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22 @param in The plaintext
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23 @param inlen The length of the plaintext (ciphertext length is the same)
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24 @param out The ciphertext
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25 @param tag [out] The MAC tag
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26 @param taglen [in/out] The MAC tag length
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27 @param direction Encrypt or Decrypt mode (CHACHA20POLY1305_ENCRYPT or CHACHA20POLY1305_DECRYPT)
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28 @return CRYPT_OK on success
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29 */
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30 int chacha20poly1305_memory(const unsigned char *key, unsigned long keylen,
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31 const unsigned char *iv, unsigned long ivlen,
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32 const unsigned char *aad, unsigned long aadlen,
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33 const unsigned char *in, unsigned long inlen,
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34 unsigned char *out,
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35 unsigned char *tag, unsigned long *taglen,
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36 int direction)
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37 {
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38 chacha20poly1305_state st;
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39 int err;
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40
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41 LTC_ARGCHK(key != NULL);
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42 LTC_ARGCHK(iv != NULL);
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43 LTC_ARGCHK(in != NULL);
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44 LTC_ARGCHK(out != NULL);
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45 LTC_ARGCHK(tag != NULL);
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46
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47 if ((err = chacha20poly1305_init(&st, key, keylen)) != CRYPT_OK) { goto LBL_ERR; }
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48 if ((err = chacha20poly1305_setiv(&st, iv, ivlen)) != CRYPT_OK) { goto LBL_ERR; }
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49 if (aad && aadlen > 0) {
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50 if ((err = chacha20poly1305_add_aad(&st, aad, aadlen)) != CRYPT_OK) { goto LBL_ERR; }
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51 }
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52 if (direction == CHACHA20POLY1305_ENCRYPT) {
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53 if ((err = chacha20poly1305_encrypt(&st, in, inlen, out)) != CRYPT_OK) { goto LBL_ERR; }
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54 }
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55 else if (direction == CHACHA20POLY1305_DECRYPT) {
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56 if ((err = chacha20poly1305_decrypt(&st, in, inlen, out)) != CRYPT_OK) { goto LBL_ERR; }
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57 }
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58 else {
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59 err = CRYPT_INVALID_ARG;
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60 goto LBL_ERR;
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61 }
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62 err = chacha20poly1305_done(&st, tag, taglen);
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63 LBL_ERR:
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64 #ifdef LTC_CLEAN_STACK
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65 zeromem(&st, sizeof(chacha20poly1305_state));
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66 #endif
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67 return err;
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68 }
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69
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70 #endif
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71
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72 /* ref: $Format:%D$ */
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73 /* git commit: $Format:%H$ */
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74 /* commit time: $Format:%ai$ */