Mercurial > dropbear
annotate libtomcrypt/src/mac/f9/f9_done.c @ 1622:e11ed628708b
- Add adaptive authentication failure delay
- Rework monotonic_now/gettime_wrapper and use clock_gettime on more platforms
author | Matt Johnston <matt@ucc.asn.au> |
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date | Mon, 05 Nov 2018 23:36:34 +0800 |
parents | 6dba84798cd5 |
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rev | line source |
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382
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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 f9_done.c |
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13 f9 Support, terminate the state |
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14 */ |
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15 |
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16 #ifdef LTC_F9_MODE |
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17 |
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18 /** Terminate the f9-MAC state |
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19 @param f9 f9 state to terminate |
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20 @param out [out] Destination for the MAC tag |
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21 @param outlen [in/out] Destination size and final tag size |
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22 Return CRYPT_OK on success |
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23 */ |
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24 int f9_done(f9_state *f9, unsigned char *out, unsigned long *outlen) |
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25 { |
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26 int err, x; |
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27 LTC_ARGCHK(f9 != NULL); |
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28 LTC_ARGCHK(out != NULL); |
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29 |
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30 /* check structure */ |
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31 if ((err = cipher_is_valid(f9->cipher)) != CRYPT_OK) { |
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32 return err; |
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33 } |
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34 |
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35 if ((f9->blocksize > cipher_descriptor[f9->cipher].block_length) || (f9->blocksize < 0) || |
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36 (f9->buflen > f9->blocksize) || (f9->buflen < 0)) { |
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37 return CRYPT_INVALID_ARG; |
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38 } |
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39 |
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40 if (f9->buflen != 0) { |
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41 /* encrypt */ |
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42 cipher_descriptor[f9->cipher].ecb_encrypt(f9->IV, f9->IV, &f9->key); |
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43 f9->buflen = 0; |
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44 for (x = 0; x < f9->blocksize; x++) { |
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45 f9->ACC[x] ^= f9->IV[x]; |
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46 } |
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47 } |
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48 |
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49 /* schedule modified key */ |
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50 if ((err = cipher_descriptor[f9->cipher].setup(f9->akey, f9->keylen, 0, &f9->key)) != CRYPT_OK) { |
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51 return err; |
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52 } |
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53 |
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54 /* encrypt the ACC */ |
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55 cipher_descriptor[f9->cipher].ecb_encrypt(f9->ACC, f9->ACC, &f9->key); |
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56 cipher_descriptor[f9->cipher].done(&f9->key); |
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57 |
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58 /* extract tag */ |
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59 for (x = 0; x < f9->blocksize && (unsigned long)x < *outlen; x++) { |
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60 out[x] = f9->ACC[x]; |
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61 } |
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62 *outlen = x; |
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63 |
382
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64 #ifdef LTC_CLEAN_STACK |
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65 zeromem(f9, sizeof(*f9)); |
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66 #endif |
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67 return CRYPT_OK; |
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68 } |
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69 |
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70 #endif |
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71 |
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72 /* ref: $Format:%D$ */ |
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73 /* git commit: $Format:%H$ */ |
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74 /* commit time: $Format:%ai$ */ |
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75 |