Mercurial > dropbear
annotate libtomcrypt/src/encauth/gcm/gcm_done.c @ 744:504f33c684b5 kexguess
Add sentinel attribute
author | Matt Johnston <matt@ucc.asn.au> |
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date | Wed, 03 Apr 2013 00:32:05 +0800 |
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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 * Tom St Denis, [email protected], http://libtomcrypt.com |
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10 */ |
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11 |
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12 /** |
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13 @file gcm_done.c |
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14 GCM implementation, Terminate the stream, by Tom St Denis |
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15 */ |
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16 #include "tomcrypt.h" |
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17 |
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18 #ifdef GCM_MODE |
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19 |
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20 /** |
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21 Terminate a GCM stream |
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22 @param gcm The GCM state |
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23 @param tag [out] The destination for the MAC tag |
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24 @param taglen [in/out] The length of the MAC tag |
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25 @return CRYPT_OK on success |
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26 */ |
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27 int gcm_done(gcm_state *gcm, |
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28 unsigned char *tag, unsigned long *taglen) |
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29 { |
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30 unsigned long x; |
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31 int err; |
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32 |
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33 LTC_ARGCHK(gcm != NULL); |
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34 LTC_ARGCHK(tag != NULL); |
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35 LTC_ARGCHK(taglen != NULL); |
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36 |
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37 if (gcm->buflen > 16 || gcm->buflen < 0) { |
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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 ((err = cipher_is_valid(gcm->cipher)) != CRYPT_OK) { |
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42 return err; |
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43 } |
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44 |
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45 |
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46 if (gcm->mode != GCM_MODE_TEXT) { |
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47 return CRYPT_INVALID_ARG; |
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48 } |
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49 |
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50 /* handle remaining ciphertext */ |
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51 if (gcm->buflen) { |
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52 gcm->pttotlen += gcm->buflen * CONST64(8); |
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53 gcm_mult_h(gcm, gcm->X); |
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54 } |
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55 |
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56 /* length */ |
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57 STORE64H(gcm->totlen, gcm->buf); |
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58 STORE64H(gcm->pttotlen, gcm->buf+8); |
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59 for (x = 0; x < 16; x++) { |
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60 gcm->X[x] ^= gcm->buf[x]; |
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61 } |
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62 gcm_mult_h(gcm, gcm->X); |
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63 |
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64 /* encrypt original counter */ |
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65 if ((err = cipher_descriptor[gcm->cipher].ecb_encrypt(gcm->Y_0, gcm->buf, &gcm->K)) != CRYPT_OK) { |
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66 return err; |
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67 } |
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68 for (x = 0; x < 16 && x < *taglen; x++) { |
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69 tag[x] = gcm->buf[x] ^ gcm->X[x]; |
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70 } |
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71 *taglen = x; |
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72 |
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73 cipher_descriptor[gcm->cipher].done(&gcm->K); |
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74 |
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75 return CRYPT_OK; |
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76 } |
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77 |
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78 #endif |
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79 |
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80 |
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81 /* $Source: /cvs/libtom/libtomcrypt/src/encauth/gcm/gcm_done.c,v $ */ |
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82 /* $Revision: 1.9 $ */ |
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propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
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83 /* $Date: 2006/03/31 14:15:35 $ */ |