Mercurial > dropbear

annotate libtomcrypt/src/misc/pkcs5/pkcs_5_1.c @ 1422:4cebe907dfd0

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limit input size
author Matt Johnston <matt@ucc.asn.au>
date Thu, 25 May 2017 22:21:23 +0800
parents 0cbe8f6dbf9e
children f849a5ca2efc
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
285
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diff changeset
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 *
382
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diff changeset
9 * Tom St Denis, [email protected], http://libtomcrypt.com
285
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10 */
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11 #include <tomcrypt.h>
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12
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13 /**
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diff changeset
14 @file pkcs_5_1.c
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15 PKCS #5, Algorithm #1, Tom St Denis
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16 */
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17 #ifdef PKCS_5
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18 /**
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19 Execute PKCS #5 v1
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20 @param password The password (or key)
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21 @param password_len The length of the password (octet)
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22 @param salt The salt (or nonce) which is 8 octets long
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23 @param iteration_count The PKCS #5 v1 iteration count
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24 @param hash_idx The index of the hash desired
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25 @param out [out] The destination for this algorithm
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26 @param outlen [in/out] The max size and resulting size of the algorithm output
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27 @return CRYPT_OK if successful
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28 */
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29 int pkcs_5_alg1(const unsigned char *password, unsigned long password_len,
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30 const unsigned char *salt,
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31 int iteration_count, int hash_idx,
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32 unsigned char *out, unsigned long *outlen)
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33 {
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34 int err;
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35 unsigned long x;
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36 hash_state *md;
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37 unsigned char *buf;
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38
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39 LTC_ARGCHK(password != NULL);
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40 LTC_ARGCHK(salt != NULL);
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41 LTC_ARGCHK(out != NULL);
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42 LTC_ARGCHK(outlen != NULL);
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43
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44 /* test hash IDX */
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45 if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) {
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46 return err;
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47 }
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48
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49 /* allocate memory */
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50 md = XMALLOC(sizeof(hash_state));
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51 buf = XMALLOC(MAXBLOCKSIZE);
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52 if (md == NULL || buf == NULL) {
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53 if (md != NULL) {
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54 XFREE(md);
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55 }
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56 if (buf != NULL) {
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57 XFREE(buf);
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58 }
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59 return CRYPT_MEM;
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60 }
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61
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62 /* hash initial password + salt */
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63 if ((err = hash_descriptor[hash_idx].init(md)) != CRYPT_OK) {
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64 goto LBL_ERR;
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65 }
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66 if ((err = hash_descriptor[hash_idx].process(md, password, password_len)) != CRYPT_OK) {
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67 goto LBL_ERR;
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68 }
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69 if ((err = hash_descriptor[hash_idx].process(md, salt, 8)) != CRYPT_OK) {
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70 goto LBL_ERR;
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71 }
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72 if ((err = hash_descriptor[hash_idx].done(md, buf)) != CRYPT_OK) {
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73 goto LBL_ERR;
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74 }
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75
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76 while (--iteration_count) {
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77 /* code goes here. */
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78 x = MAXBLOCKSIZE;
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79 if ((err = hash_memory(hash_idx, buf, hash_descriptor[hash_idx].hashsize, buf, &x)) != CRYPT_OK) {
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Matt Johnston <matt@ucc.asn.au>
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80 goto LBL_ERR;
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81 }
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82 }
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parents:
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83
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84 /* copy upto outlen bytes */
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85 for (x = 0; x < hash_descriptor[hash_idx].hashsize && x < *outlen; x++) {
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86 out[x] = buf[x];
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87 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
88 *outlen = x;
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diff changeset
89 err = CRYPT_OK;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
90 LBL_ERR:
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
91 #ifdef LTC_CLEAN_STACK
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
92 zeromem(buf, MAXBLOCKSIZE);
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
93 zeromem(md, sizeof(hash_state));
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
94 #endif
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
95
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
96 XFREE(buf);
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
97 XFREE(md);
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
98
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
99 return err;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
100 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
101
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
102 #endif
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
103
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
104 /* $Source: /cvs/libtom/libtomcrypt/src/misc/pkcs5/pkcs_5_1.c,v $ */
382
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
105 /* $Revision: 1.5 $ */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
106 /* $Date: 2006/03/31 14:15:35 $ */