Mercurial > dropbear

annotate libtomcrypt/src/modes/ctr/ctr_encrypt.c @ 1484:f68ee671bf6d

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author Matt Johnston <matt@ucc.asn.au>
date Sat, 10 Feb 2018 18:57:20 +0800
parents 6dba84798cd5
children e9dba7abd939
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285
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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 #include "tomcrypt.h"
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10
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11 /**
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12 @file ctr_encrypt.c
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13 CTR implementation, encrypt data, Tom St Denis
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14 */
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15
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16
382
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17 #ifdef LTC_CTR_MODE
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18
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19 /**
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20 CTR encrypt
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21 @param pt Plaintext
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22 @param ct [out] Ciphertext
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23 @param len Length of plaintext (octets)
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24 @param ctr CTR state
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25 @return CRYPT_OK if successful
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26 */
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27 int ctr_encrypt(const unsigned char *pt, unsigned char *ct, unsigned long len, symmetric_CTR *ctr)
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28 {
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29 int x, err;
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30
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31 LTC_ARGCHK(pt != NULL);
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32 LTC_ARGCHK(ct != NULL);
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33 LTC_ARGCHK(ctr != NULL);
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34
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35 if ((err = cipher_is_valid(ctr->cipher)) != CRYPT_OK) {
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36 return err;
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37 }
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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38
285
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39 /* is blocklen/padlen valid? */
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40 if (ctr->blocklen < 1 || ctr->blocklen > (int)sizeof(ctr->ctr) ||
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41 ctr->padlen < 0 || ctr->padlen > (int)sizeof(ctr->pad)) {
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42 return CRYPT_INVALID_ARG;
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43 }
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44
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45 #ifdef LTC_FAST
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46 if (ctr->blocklen % sizeof(LTC_FAST_TYPE)) {
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47 return CRYPT_INVALID_ARG;
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48 }
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49 #endif
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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50
285
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51 /* handle acceleration only if pad is empty, accelerator is present and length is >= a block size */
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52 if ((ctr->padlen == ctr->blocklen) && cipher_descriptor[ctr->cipher].accel_ctr_encrypt != NULL && (len >= (unsigned long)ctr->blocklen)) {
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53 if ((err = cipher_descriptor[ctr->cipher].accel_ctr_encrypt(pt, ct, len/ctr->blocklen, ctr->ctr, ctr->mode, &ctr->key)) != CRYPT_OK) {
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54 return err;
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55 }
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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56 pt += (len / ctr->blocklen) * ctr->blocklen;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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57 ct += (len / ctr->blocklen) * ctr->blocklen;
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58 len %= ctr->blocklen;
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59 }
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60
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61 while (len) {
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62 /* is the pad empty? */
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63 if (ctr->padlen == ctr->blocklen) {
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64 /* increment counter */
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65 if (ctr->mode == CTR_COUNTER_LITTLE_ENDIAN) {
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66 /* little-endian */
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67 for (x = 0; x < ctr->ctrlen; x++) {
285
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68 ctr->ctr[x] = (ctr->ctr[x] + (unsigned char)1) & (unsigned char)255;
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69 if (ctr->ctr[x] != (unsigned char)0) {
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70 break;
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71 }
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72 }
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73 } else {
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74 /* big-endian */
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75 for (x = ctr->blocklen-1; x >= ctr->ctrlen; x--) {
285
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76 ctr->ctr[x] = (ctr->ctr[x] + (unsigned char)1) & (unsigned char)255;
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77 if (ctr->ctr[x] != (unsigned char)0) {
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78 break;
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79 }
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80 }
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81 }
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82
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83 /* encrypt it */
382
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84 if ((err = cipher_descriptor[ctr->cipher].ecb_encrypt(ctr->ctr, ctr->pad, &ctr->key)) != CRYPT_OK) {
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85 return err;
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86 }
285
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87 ctr->padlen = 0;
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88 }
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diff changeset
89 #ifdef LTC_FAST
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parents:
diff changeset
90 if (ctr->padlen == 0 && len >= (unsigned long)ctr->blocklen) {
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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diff changeset
91 for (x = 0; x < ctr->blocklen; x += sizeof(LTC_FAST_TYPE)) {
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92 *(LTC_FAST_TYPE_PTR_CAST((unsigned char *)ct + x)) = *(LTC_FAST_TYPE_PTR_CAST((unsigned char *)pt + x)) ^
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
93 *(LTC_FAST_TYPE_PTR_CAST((unsigned char *)ctr->pad + x));
285
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
94 }
382
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
95 pt += ctr->blocklen;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
96 ct += ctr->blocklen;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
97 len -= ctr->blocklen;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
98 ctr->padlen = ctr->blocklen;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
99 continue;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
100 }
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Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
101 #endif
382
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
102 *ct++ = *pt++ ^ ctr->pad[ctr->padlen++];
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
103 --len;
285
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 return CRYPT_OK;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
106 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
107
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
108 #endif
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
109
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diff changeset
110 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
111 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
112 /* commit time: $Format:%ai$ */