Mercurial > dropbear

annotate libtomcrypt/src/encauth/gcm/gcm_add_iv.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 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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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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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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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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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
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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
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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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parents: 1435
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92 /* commit time: $Format:%ai$ */