Mercurial > dropbear
annotate libtomcrypt/src/encauth/ocb/ocb_decrypt.c @ 1744:6cf465af5d9f fuzz
Allocate real file descriptors for fuzz input with dup()
author | Matt Johnston <matt@ucc.asn.au> |
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date | Sun, 18 Oct 2020 22:52:24 +0800 |
parents | 6dba84798cd5 |
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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 ocb_decrypt.c |
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12 OCB implementation, decrypt data, 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_OCB_MODE |
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17 |
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18 /** |
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19 Decrypt a block with OCB. |
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20 @param ocb The OCB state |
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21 @param ct The ciphertext (length of the block size of the block cipher) |
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22 @param pt [out] The plaintext (length of ct) |
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23 @return CRYPT_OK if successful |
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24 */ |
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25 int ocb_decrypt(ocb_state *ocb, const unsigned char *ct, unsigned char *pt) |
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26 { |
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27 unsigned char Z[MAXBLOCKSIZE], 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(pt != NULL); |
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32 LTC_ARGCHK(ct != NULL); |
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33 |
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34 /* check if valid cipher */ |
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35 if ((err = cipher_is_valid(ocb->cipher)) != CRYPT_OK) { |
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36 return err; |
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37 } |
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38 LTC_ARGCHK(cipher_descriptor[ocb->cipher].ecb_decrypt != NULL); |
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39 |
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40 /* check length */ |
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41 if (ocb->block_len != cipher_descriptor[ocb->cipher].block_length) { |
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42 return CRYPT_INVALID_ARG; |
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43 } |
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44 |
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45 /* Get Z[i] value */ |
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46 ocb_shift_xor(ocb, Z); |
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47 |
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48 /* xor ct in, encrypt, xor Z out */ |
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49 for (x = 0; x < ocb->block_len; x++) { |
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50 tmp[x] = ct[x] ^ Z[x]; |
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51 } |
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52 if ((err = cipher_descriptor[ocb->cipher].ecb_decrypt(tmp, pt, &ocb->key)) != CRYPT_OK) { |
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53 return err; |
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54 } |
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55 for (x = 0; x < ocb->block_len; x++) { |
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56 pt[x] ^= Z[x]; |
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57 } |
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58 |
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59 /* compute checksum */ |
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60 for (x = 0; x < ocb->block_len; x++) { |
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61 ocb->checksum[x] ^= pt[x]; |
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62 } |
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63 |
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64 |
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65 #ifdef LTC_CLEAN_STACK |
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66 zeromem(Z, sizeof(Z)); |
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67 zeromem(tmp, sizeof(tmp)); |
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68 #endif |
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69 return CRYPT_OK; |
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70 } |
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71 |
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72 #endif |
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73 |
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74 |
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75 /* ref: $Format:%D$ */ |
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76 /* git commit: $Format:%H$ */ |
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77 /* commit time: $Format:%ai$ */ |