Mercurial > dropbear
annotate libtomcrypt/src/encauth/ocb3/ocb3_done.c @ 1905:77e5c8f778d3
Add build test with DEBUG_TRACE 5
author | Matt Johnston <matt@ucc.asn.au> |
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date | Thu, 24 Mar 2022 16:47:20 +0800 |
parents | 6dba84798cd5 |
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1471
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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 ocb3_done.c |
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12 OCB implementation, INTERNAL ONLY helper, 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_OCB3_MODE |
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17 |
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18 /** |
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19 Finish OCB processing and compute the tag |
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20 @param ocb The OCB state |
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21 @param tag [out] The destination for the authentication tag |
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22 @param taglen [in/out] The max size and resulting size of the authentication tag |
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23 @return CRYPT_OK if successful |
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24 */ |
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25 int ocb3_done(ocb3_state *ocb, unsigned char *tag, unsigned long *taglen) |
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26 { |
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27 unsigned char tmp[MAXBLOCKSIZE]; |
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28 int err, x; |
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29 |
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30 LTC_ARGCHK(ocb != NULL); |
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31 LTC_ARGCHK(tag != NULL); |
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32 LTC_ARGCHK(taglen != NULL); |
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33 if ((err = cipher_is_valid(ocb->cipher)) != CRYPT_OK) { |
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34 goto LBL_ERR; |
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35 } |
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36 |
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37 /* check taglen */ |
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38 if ((int)*taglen < ocb->tag_len) { |
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39 *taglen = (unsigned long)ocb->tag_len; |
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40 return CRYPT_BUFFER_OVERFLOW; |
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41 } |
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42 |
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43 /* finalize AAD processing */ |
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44 |
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45 if (ocb->adata_buffer_bytes>0) { |
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46 /* Offset_* = Offset_m xor L_* */ |
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47 ocb3_int_xor_blocks(ocb->aOffset_current, ocb->aOffset_current, ocb->L_star, ocb->block_len); |
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48 |
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49 /* CipherInput = (A_* || 1 || zeros(127-bitlen(A_*))) xor Offset_* */ |
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50 ocb3_int_xor_blocks(tmp, ocb->adata_buffer, ocb->aOffset_current, ocb->adata_buffer_bytes); |
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51 for(x=ocb->adata_buffer_bytes; x<ocb->block_len; x++) { |
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52 if (x == ocb->adata_buffer_bytes) { |
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53 tmp[x] = 0x80 ^ ocb->aOffset_current[x]; |
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54 } |
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55 else { |
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56 tmp[x] = 0x00 ^ ocb->aOffset_current[x]; |
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57 } |
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58 } |
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59 |
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60 /* Sum = Sum_m xor ENCIPHER(K, CipherInput) */ |
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61 if ((err = cipher_descriptor[ocb->cipher].ecb_encrypt(tmp, tmp, &ocb->key)) != CRYPT_OK) { |
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62 goto LBL_ERR; |
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63 } |
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64 ocb3_int_xor_blocks(ocb->aSum_current, ocb->aSum_current, tmp, ocb->block_len); |
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65 } |
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66 |
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67 /* finalize TAG computing */ |
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68 |
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69 /* at this point ocb->aSum_current = HASH(K, A) */ |
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70 /* tag = tag ^ HASH(K, A) */ |
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71 ocb3_int_xor_blocks(tmp, ocb->tag_part, ocb->aSum_current, ocb->block_len); |
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72 |
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73 /* copy tag bytes */ |
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74 for(x = 0; x < ocb->tag_len; x++) tag[x] = tmp[x]; |
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75 *taglen = (unsigned long)ocb->tag_len; |
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76 |
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77 err = CRYPT_OK; |
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78 |
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79 LBL_ERR: |
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80 #ifdef LTC_CLEAN_STACK |
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81 zeromem(tmp, MAXBLOCKSIZE); |
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82 zeromem(ocb, sizeof(*ocb)); |
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83 #endif |
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84 |
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85 return err; |
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86 } |
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87 |
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88 #endif |
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89 |
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90 /* ref: $Format:%D$ */ |
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91 /* git commit: $Format:%H$ */ |
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92 /* commit time: $Format:%ai$ */ |