Mercurial > dropbear

annotate libtomcrypt/src/modes/f8/f8_encrypt.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
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
382
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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 #include "tomcrypt.h"
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10
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11 /**
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12 @file f8_encrypt.c
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13 F8 implementation, encrypt data, Tom St Denis
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14 */
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15
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16 #ifdef LTC_F8_MODE
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17
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18 /**
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19 F8 encrypt
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20 @param pt Plaintext
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21 @param ct [out] Ciphertext
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22 @param len Length of plaintext (octets)
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23 @param f8 F8 state
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24 @return CRYPT_OK if successful
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25 */
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26 int f8_encrypt(const unsigned char *pt, unsigned char *ct, unsigned long len, symmetric_F8 *f8)
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27 {
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28 int err, x;
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29 unsigned char buf[MAXBLOCKSIZE];
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30 LTC_ARGCHK(pt != NULL);
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31 LTC_ARGCHK(ct != NULL);
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32 LTC_ARGCHK(f8 != NULL);
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33 if ((err = cipher_is_valid(f8->cipher)) != CRYPT_OK) {
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34 return err;
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35 }
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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36
382
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37 /* is blocklen/padlen valid? */
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38 if (f8->blocklen < 0 || f8->blocklen > (int)sizeof(f8->IV) ||
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39 f8->padlen < 0 || f8->padlen > (int)sizeof(f8->IV)) {
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40 return CRYPT_INVALID_ARG;
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41 }
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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42
382
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43 zeromem(buf, sizeof(buf));
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44
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45 /* make sure the pad is empty */
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46 if (f8->padlen == f8->blocklen) {
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47 /* xor of IV, MIV and blockcnt == what goes into cipher */
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48 STORE32H(f8->blockcnt, (buf+(f8->blocklen-4)));
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49 ++(f8->blockcnt);
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50 for (x = 0; x < f8->blocklen; x++) {
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51 f8->IV[x] ^= f8->MIV[x] ^ buf[x];
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52 }
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53 if ((err = cipher_descriptor[f8->cipher].ecb_encrypt(f8->IV, f8->IV, &f8->key)) != CRYPT_OK) {
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54 return err;
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55 }
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56 f8->padlen = 0;
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57 }
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58
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59 #ifdef LTC_FAST
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60 if (f8->padlen == 0) {
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61 while (len >= (unsigned long)f8->blocklen) {
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62 STORE32H(f8->blockcnt, (buf+(f8->blocklen-4)));
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63 ++(f8->blockcnt);
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64 for (x = 0; x < f8->blocklen; x += sizeof(LTC_FAST_TYPE)) {
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents: 1435
diff changeset
65 *(LTC_FAST_TYPE_PTR_CAST(&ct[x])) = *(LTC_FAST_TYPE_PTR_CAST(&pt[x])) ^ *(LTC_FAST_TYPE_PTR_CAST(&f8->IV[x]));
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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66 *(LTC_FAST_TYPE_PTR_CAST(&f8->IV[x])) ^= *(LTC_FAST_TYPE_PTR_CAST(&f8->MIV[x])) ^ *(LTC_FAST_TYPE_PTR_CAST(&buf[x]));
382
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67 }
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68 if ((err = cipher_descriptor[f8->cipher].ecb_encrypt(f8->IV, f8->IV, &f8->key)) != CRYPT_OK) {
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69 return err;
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70 }
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71 len -= x;
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72 pt += x;
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73 ct += x;
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74 }
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75 }
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
76 #endif
382
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77
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78 while (len > 0) {
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diff changeset
79 if (f8->padlen == f8->blocklen) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
80 /* xor of IV, MIV and blockcnt == what goes into cipher */
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81 STORE32H(f8->blockcnt, (buf+(f8->blocklen-4)));
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82 ++(f8->blockcnt);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
83 for (x = 0; x < f8->blocklen; x++) {
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
84 f8->IV[x] ^= f8->MIV[x] ^ buf[x];
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
85 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
86 if ((err = cipher_descriptor[f8->cipher].ecb_encrypt(f8->IV, f8->IV, &f8->key)) != CRYPT_OK) {
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
87 return err;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
88 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
89 f8->padlen = 0;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
90 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
91 *ct++ = *pt++ ^ f8->IV[f8->padlen++];
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
92 --len;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
93 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
94 return CRYPT_OK;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
95 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
96
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
97 #endif
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
98
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
99 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
100 /* 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
101 /* commit time: $Format:%ai$ */