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annotate libtomcrypt/src/encauth/ocb3/ocb3_decrypt_verify_memory.c @ 1629:258b57b208ae

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Fix for issue successfull login of disabled user (#78) This commit introduces fix for scenario: 1. Root login disabled on dropbear 2. PAM authentication model enabled While login as root user, after prompt for password user is being notified about login failrue, but after second attempt of prompt for password within same session, login becames succesfull. Signed-off-by: Pawel Rapkiewicz <[email protected]>
author vincentto13 <33652988+vincentto13@users.noreply.github.com>
date Wed, 20 Mar 2019 15:03:40 +0100
parents 6dba84798cd5
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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_decrypt_verify_memory.c
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12 OCB implementation, helper to decrypt 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_OCB3_MODE
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17
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18 /**
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19 Decrypt and compare the tag with OCB
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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 size of the block cipher)
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24 @param noncelen The length of the nonce (octets)
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25 @param adata The AAD - additional associated data
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26 @param adatalen The length of AAD (octets)
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27 @param ct The ciphertext
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28 @param ctlen The length of the ciphertext (octets)
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29 @param pt [out] The plaintext
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30 @param tag The tag to compare against
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31 @param taglen The length of the tag (octets)
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32 @param stat [out] The result of the tag comparison (1==valid, 0==invalid)
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33 @return CRYPT_OK if successful regardless of the tag comparison
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34 */
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35 int ocb3_decrypt_verify_memory(int cipher,
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36 const unsigned char *key, unsigned long keylen,
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37 const unsigned char *nonce, unsigned long noncelen,
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38 const unsigned char *adata, unsigned long adatalen,
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39 const unsigned char *ct, unsigned long ctlen,
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40 unsigned char *pt,
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41 const unsigned char *tag, unsigned long taglen,
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42 int *stat)
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43 {
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44 int err;
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45 ocb3_state *ocb;
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46 unsigned char *buf;
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47 unsigned long buflen;
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48
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49 LTC_ARGCHK(stat != NULL);
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50
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51 /* default to zero */
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52 *stat = 0;
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53
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54 /* limit taglen */
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55 taglen = MIN(taglen, MAXBLOCKSIZE);
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56
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57 /* allocate memory */
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58 buf = XMALLOC(taglen);
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59 ocb = XMALLOC(sizeof(ocb3_state));
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60 if (ocb == NULL || buf == NULL) {
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61 if (ocb != NULL) {
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62 XFREE(ocb);
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63 }
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64 if (buf != NULL) {
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65 XFREE(buf);
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66 }
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67 return CRYPT_MEM;
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68 }
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69
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70 if ((err = ocb3_init(ocb, cipher, key, keylen, nonce, noncelen, taglen)) != CRYPT_OK) {
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71 goto LBL_ERR;
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72 }
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73
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74 if (adata != NULL || adatalen != 0) {
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75 if ((err = ocb3_add_aad(ocb, adata, adatalen)) != CRYPT_OK) {
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76 goto LBL_ERR;
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77 }
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78 }
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79
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80 if ((err = ocb3_decrypt_last(ocb, ct, ctlen, pt)) != CRYPT_OK) {
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81 goto LBL_ERR;
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82 }
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83
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84 buflen = taglen;
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85 if ((err = ocb3_done(ocb, buf, &buflen)) != CRYPT_OK) {
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86 goto LBL_ERR;
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87 }
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88
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89 /* compare tags */
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90 if (buflen >= taglen && XMEM_NEQ(buf, tag, taglen) == 0) {
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91 *stat = 1;
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92 }
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93
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94 err = CRYPT_OK;
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95
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96 LBL_ERR:
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97 #ifdef LTC_CLEAN_STACK
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98 zeromem(ocb, sizeof(ocb3_state));
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99 #endif
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100
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101 XFREE(ocb);
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102 XFREE(buf);
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103 return err;
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104 }
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105
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106 #endif
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107
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108 /* ref: $Format:%D$ */
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109 /* git commit: $Format:%H$ */
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110 /* commit time: $Format:%ai$ */