Mercurial > dropbear
annotate libtomcrypt/src/encauth/ocb/ocb_encrypt_authenticate_memory.c @ 1690:2a06ef4ba80d
.travis.yml needs spaces not tabs
author | Matt Johnston <matt@ucc.asn.au> |
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date | Tue, 26 May 2020 23:16:11 +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_encrypt_authenticate_memory.c |
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12 OCB implementation, encrypt block of memory, 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 Encrypt and generate an authentication code for a buffer of memory |
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20 @param cipher The index of the cipher desired |
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21 @param key The secret key |
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22 @param keylen The length of the secret key (octets) |
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23 @param nonce The session nonce (length of the block ciphers block size) |
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24 @param pt The plaintext |
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25 @param ptlen The length of the plaintext (octets) |
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26 @param ct [out] The ciphertext |
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27 @param tag [out] The authentication tag |
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28 @param taglen [in/out] The max size and resulting size of the authentication tag |
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29 @return CRYPT_OK if successful |
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30 */ |
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31 int ocb_encrypt_authenticate_memory(int cipher, |
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32 const unsigned char *key, unsigned long keylen, |
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33 const unsigned char *nonce, |
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34 const unsigned char *pt, unsigned long ptlen, |
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35 unsigned char *ct, |
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36 unsigned char *tag, unsigned long *taglen) |
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37 { |
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38 int err; |
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39 ocb_state *ocb; |
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40 |
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41 LTC_ARGCHK(key != NULL); |
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42 LTC_ARGCHK(nonce != NULL); |
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43 LTC_ARGCHK(pt != NULL); |
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44 LTC_ARGCHK(ct != NULL); |
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45 LTC_ARGCHK(tag != NULL); |
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46 LTC_ARGCHK(taglen != NULL); |
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47 |
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48 /* allocate ram */ |
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49 ocb = XMALLOC(sizeof(ocb_state)); |
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50 if (ocb == NULL) { |
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51 return CRYPT_MEM; |
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52 } |
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53 |
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54 if ((err = ocb_init(ocb, cipher, key, keylen, nonce)) != CRYPT_OK) { |
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55 goto LBL_ERR; |
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56 } |
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57 |
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58 while (ptlen > (unsigned long)ocb->block_len) { |
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59 if ((err = ocb_encrypt(ocb, pt, ct)) != CRYPT_OK) { |
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60 goto LBL_ERR; |
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61 } |
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62 ptlen -= ocb->block_len; |
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63 pt += ocb->block_len; |
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64 ct += ocb->block_len; |
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65 } |
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66 |
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67 err = ocb_done_encrypt(ocb, pt, ptlen, ct, tag, taglen); |
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68 LBL_ERR: |
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69 #ifdef LTC_CLEAN_STACK |
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70 zeromem(ocb, sizeof(ocb_state)); |
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71 #endif |
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72 |
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73 XFREE(ocb); |
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74 |
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75 return err; |
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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 /* ref: $Format:%D$ */ |
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81 /* git commit: $Format:%H$ */ |
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82 /* commit time: $Format:%ai$ */ |