Mercurial > dropbear

annotate libtomcrypt/src/encauth/eax/eax_decrypt_verify_memory.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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10 /**
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11 @file eax_decrypt_verify_memory.c
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12 EAX implementation, 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
1435
f849a5ca2efc update to libtomcrypt 1.17 (with Dropbear changes)
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16 #ifdef LTC_EAX_MODE
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17
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18 /**
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19 Decrypt a block of memory and verify the provided MAC tag with EAX
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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 key (octets)
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23 @param nonce The nonce data (use once) for the session
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24 @param noncelen The length of the nonce data.
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25 @param header The session header data
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26 @param headerlen The length of the header (octets)
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27 @param ct The ciphertext
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28 @param ctlen The length of the ciphertext (octets)
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29 @param pt [out] The plaintext
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30 @param tag The authentication tag provided by the encoder
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31 @param taglen [in/out] The length of the tag (octets)
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32 @param stat [out] The result of the decryption (1==valid tag, 0==invalid)
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33 @return CRYPT_OK if successful regardless of the resulting tag comparison
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34 */
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35 int eax_decrypt_verify_memory(int cipher,
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36 const unsigned char *key, unsigned long keylen,
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37 const unsigned char *nonce, unsigned long noncelen,
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38 const unsigned char *header, unsigned long headerlen,
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39 const unsigned char *ct, unsigned long ctlen,
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40 unsigned char *pt,
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41 unsigned char *tag, unsigned long taglen,
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42 int *stat)
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43 {
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44 int err;
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45 eax_state *eax;
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46 unsigned char *buf;
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47 unsigned long buflen;
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48
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49 LTC_ARGCHK(stat != NULL);
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50 LTC_ARGCHK(key != NULL);
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51 LTC_ARGCHK(pt != NULL);
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52 LTC_ARGCHK(ct != NULL);
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53 LTC_ARGCHK(tag != NULL);
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54
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55 /* default to zero */
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56 *stat = 0;
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57
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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58 /* limit taglen */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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59 taglen = MIN(taglen, MAXBLOCKSIZE);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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60
285
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61 /* allocate ram */
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62 buf = XMALLOC(taglen);
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63 eax = XMALLOC(sizeof(*eax));
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64 if (eax == NULL || buf == NULL) {
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65 if (eax != NULL) {
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66 XFREE(eax);
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67 }
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68 if (buf != NULL) {
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69 XFREE(buf);
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70 }
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71 return CRYPT_MEM;
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72 }
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73
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74 if ((err = eax_init(eax, cipher, key, keylen, nonce, noncelen, header, headerlen)) != CRYPT_OK) {
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75 goto LBL_ERR;
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76 }
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77
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78 if ((err = eax_decrypt(eax, ct, pt, ctlen)) != CRYPT_OK) {
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79 goto LBL_ERR;
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80 }
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
81
285
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82 buflen = taglen;
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83 if ((err = eax_done(eax, buf, &buflen)) != CRYPT_OK) {
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84 goto LBL_ERR;
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85 }
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86
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87 /* compare tags */
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
88 if (buflen >= taglen && XMEM_NEQ(buf, tag, taglen) == 0) {
285
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89 *stat = 1;
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90 }
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91
285
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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parents:
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92 err = CRYPT_OK;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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parents:
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93 LBL_ERR:
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parents:
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94 #ifdef LTC_CLEAN_STACK
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95 zeromem(buf, taglen);
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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96 zeromem(eax, sizeof(*eax));
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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parents:
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97 #endif
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98
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
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99 XFREE(eax);
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
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100 XFREE(buf);
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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parents:
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101
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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102 return err;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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parents:
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103 }
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104
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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105 #endif
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106
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parents: 1435
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107 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents: 1435
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108 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents: 1435
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109 /* commit time: $Format:%ai$ */