Mercurial > dropbear

annotate libtomcrypt/src/encauth/gcm/gcm_add_iv.c @ 1908:eadd023fde4d

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Support RSA OpenSSH new format in dropbearconvert Added support for reading and writing. PEM writing support has been removed. OpenSSH file format routines have been moved to signkey_ossh.c
author Matt Johnston <matt@ucc.asn.au>
date Tue, 29 Mar 2022 22:27:55 +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 gcm_add_iv.c
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12 GCM implementation, add IV data to the state, by Tom St Denis
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13 */
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14 #include "tomcrypt.h"
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15
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16 #ifdef LTC_GCM_MODE
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17
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18 /**
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19 Add IV data to the GCM state
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20 @param gcm The GCM state
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21 @param IV The initial value data to add
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22 @param IVlen The length of the IV
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23 @return CRYPT_OK on success
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24 */
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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25 int gcm_add_iv(gcm_state *gcm,
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26 const unsigned char *IV, unsigned long IVlen)
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27 {
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28 unsigned long x, y;
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29 int err;
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30
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31 LTC_ARGCHK(gcm != NULL);
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32 if (IVlen > 0) {
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33 LTC_ARGCHK(IV != NULL);
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34 }
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35
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36 /* must be in IV mode */
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37 if (gcm->mode != LTC_GCM_MODE_IV) {
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38 return CRYPT_INVALID_ARG;
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39 }
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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40
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41 if (gcm->buflen >= 16 || gcm->buflen < 0) {
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42 return CRYPT_INVALID_ARG;
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43 }
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44
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45 if ((err = cipher_is_valid(gcm->cipher)) != CRYPT_OK) {
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46 return err;
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47 }
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49
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50 /* trip the ivmode flag */
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51 if (IVlen + gcm->buflen > 12) {
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52 gcm->ivmode |= 1;
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53 }
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54
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55 x = 0;
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56 #ifdef LTC_FAST
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57 if (gcm->buflen == 0) {
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58 for (x = 0; x < (IVlen & ~15); x += 16) {
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59 for (y = 0; y < 16; y += sizeof(LTC_FAST_TYPE)) {
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60 *(LTC_FAST_TYPE_PTR_CAST(&gcm->X[y])) ^= *(LTC_FAST_TYPE_PTR_CAST(&IV[x + y]));
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61 }
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62 gcm_mult_h(gcm, gcm->X);
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63 gcm->totlen += 128;
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64 }
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65 IV += x;
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66 }
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67 #endif
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68
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69 /* start adding IV data to the state */
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70 for (; x < IVlen; x++) {
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71 gcm->buf[gcm->buflen++] = *IV++;
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72
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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73 if (gcm->buflen == 16) {
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74 /* GF mult it */
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75 for (y = 0; y < 16; y++) {
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76 gcm->X[y] ^= gcm->buf[y];
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77 }
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78 gcm_mult_h(gcm, gcm->X);
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79 gcm->buflen = 0;
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80 gcm->totlen += 128;
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81 }
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82 }
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83
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84 return CRYPT_OK;
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85 }
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86
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87 #endif
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88
285
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89
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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90 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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91 /* git commit: $Format:%H$ */
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92 /* commit time: $Format:%ai$ */