annotate libtomcrypt/src/encauth/ocb/ocb_decrypt.c @ 1653:76189c9ffea2

External Public-Key Authentication API (#72) * Implemented dynamic loading of an external plug-in shared library to delegate public key authentication * Moved conditional compilation of the plugin infrastructure into the configure.ac script to be able to add -ldl to dropbear build only when the flag is enabled * Added tags file to the ignore list * Updated API to have the constructor to return function pointers in the pliugin instance. Added support for passing user name to the checkpubkey function. Added options to the session returned by the plugin and have dropbear to parse and process them * Added -rdynamic to the linker flags when EPKA is enabled * Changed the API to pass a previously created session to the checkPubKey function (created during preauth) * Added documentation to the API * Added parameter addrstring to plugin creation function * Modified the API to retrieve the auth options. Instead of having them as field of the EPKASession struct, they are stored internally (plugin-dependent) in the plugin/session and retrieved through a pointer to a function (in the session) * Changed option string to be a simple char * instead of unsigned char *
author fabriziobertocci <fabriziobertocci@gmail.com>
date Wed, 15 May 2019 09:43:57 -0400
parents 6dba84798cd5
children
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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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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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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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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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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74
1471
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75 /* ref: $Format:%D$ */
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76 /* git commit: $Format:%H$ */
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77 /* commit time: $Format:%ai$ */