Mercurial > dropbear

annotate libtomcrypt/src/encauth/eax/eax_decrypt_verify_memory.c @ 1736:0c31aedc3124

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Added signature for changeset 88f63b8b0f13
author Matt Johnston <matt@ucc.asn.au>
date Fri, 26 Jun 2020 21:57:20 +0800
parents 6dba84798cd5
children
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diff changeset
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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diff changeset
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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parents: 1435
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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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diff changeset
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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diff changeset
89 *stat = 1;
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diff changeset
90 }
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
91
285
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
92 err = CRYPT_OK;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
93 LBL_ERR:
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
94 #ifdef LTC_CLEAN_STACK
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
95 zeromem(buf, taglen);
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
96 zeromem(eax, sizeof(*eax));
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
97 #endif
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
98
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
99 XFREE(eax);
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
100 XFREE(buf);
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
101
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
102 return err;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
103 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
104
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
105 #endif
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
106
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
107 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
108 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
109 /* commit time: $Format:%ai$ */