Mercurial > dropbear

annotate libtomcrypt/src/misc/pkcs5/pkcs_5_1.c @ 1684:d5d25ce2a2ed

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cast to fix warning
author Matt Johnston <matt@ucc.asn.au>
date Tue, 26 May 2020 19:57:28 +0800
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 #include "tomcrypt.h"
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10
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11 /**
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12 @file pkcs_5_1.c
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13 PKCS #5, Algorithm #1, Tom St Denis
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14 */
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15 #ifdef LTC_PKCS_5
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16 /**
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17 Execute PKCS #5 v1 in strict or OpenSSL EVP_BytesToKey()-compat mode.
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18
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19 PKCS#5 v1 specifies that the output key length can be no larger than
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20 the hash output length. OpenSSL unilaterally extended that by repeating
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21 the hash process on a block-by-block basis for as long as needed to make
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22 bigger keys. If you want to be compatible with KDF for e.g. "openssl enc",
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23 you'll want that.
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24
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25 If you want strict PKCS behavior, turn openssl_compat off. Or (more
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26 likely), use one of the convenience functions below.
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27
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28 @param password The password (or key)
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29 @param password_len The length of the password (octet)
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30 @param salt The salt (or nonce) which is 8 octets long
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31 @param iteration_count The PKCS #5 v1 iteration count
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32 @param hash_idx The index of the hash desired
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33 @param out [out] The destination for this algorithm
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34 @param outlen [in/out] The max size and resulting size of the algorithm output
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35 @param openssl_compat [in] Whether or not to grow the key to the buffer size ala OpenSSL
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36 @return CRYPT_OK if successful
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37 */
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38 static int _pkcs_5_alg1_common(const unsigned char *password,
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39 unsigned long password_len,
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40 const unsigned char *salt,
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41 int iteration_count, int hash_idx,
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42 unsigned char *out, unsigned long *outlen,
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43 int openssl_compat)
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44 {
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45 int err;
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46 unsigned long x;
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47 hash_state *md;
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48 unsigned char *buf;
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49 /* Storage vars in case we need to support > hashsize (OpenSSL compat) */
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50 unsigned long block = 0, iter;
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51 /* How many bytes to put in the outbut buffer (convenience calc) */
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52 unsigned long outidx = 0, nb = 0;
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54 LTC_ARGCHK(password != NULL);
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55 LTC_ARGCHK(salt != NULL);
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56 LTC_ARGCHK(out != NULL);
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57 LTC_ARGCHK(outlen != NULL);
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59 /* test hash IDX */
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60 if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) {
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61 return err;
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62 }
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64 /* allocate memory */
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65 md = XMALLOC(sizeof(hash_state));
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66 buf = XMALLOC(MAXBLOCKSIZE);
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67 if (md == NULL || buf == NULL) {
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68 if (md != NULL) {
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69 XFREE(md);
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