Mercurial > dropbear

annotate libtomcrypt/src/hashes/helper/hash_filehandle.c @ 1820:e9854650d45b

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Clarify help text for dropbear -e environment option
author Matt Johnston <matt@ucc.asn.au>
date Thu, 19 Aug 2021 23:17:34 +0800
parents 1ff2a1034c52
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 #ifndef LTC_NO_FILE
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12 /**
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13 @file hash_filehandle.c
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14 Hash open files, Tom St Denis
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15 */
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16
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17 /**
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18 Hash data from an open file handle.
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19 @param hash The index of the hash you want to use
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20 @param in The FILE* handle of the file you want to hash
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21 @param out [out] The destination of the digest
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22 @param outlen [in/out] The max size and resulting size of the digest
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23 @result CRYPT_OK if successful
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24 */
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25 int hash_filehandle(int hash, FILE *in, unsigned char *out, unsigned long *outlen)
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26 {
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27 hash_state md;
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28 unsigned char *buf;
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29 size_t x;
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30 int err;
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31
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32 LTC_ARGCHK(out != NULL);
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33 LTC_ARGCHK(outlen != NULL);
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34 LTC_ARGCHK(in != NULL);
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35
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36 if ((buf = XMALLOC(LTC_FILE_READ_BUFSIZE)) == NULL) {
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37 return CRYPT_MEM;
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38 }
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39
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40 if ((err = hash_is_valid(hash)) != CRYPT_OK) {
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41 goto LBL_ERR;
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42 }
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44 if (*outlen < hash_descriptor[hash].hashsize) {
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45 *outlen = hash_descriptor[hash].hashsize;
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46 err = CRYPT_BUFFER_OVERFLOW;
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47 goto LBL_ERR;
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48 }
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49 if ((err = hash_descriptor[hash].init(&md)) != CRYPT_OK) {
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50 goto LBL_ERR;
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51 }
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52
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53 do {
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54 x = fread(buf, 1, LTC_FILE_READ_BUFSIZE, in);
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55 if ((err = hash_descriptor[hash].process(&md, buf, (unsigned long)x)) != CRYPT_OK) {
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56 goto LBL_CLEANBUF;
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57 }
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58 } while (x == LTC_FILE_READ_BUFSIZE);
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59 if ((err = hash_descriptor[hash].done(&md, out)) == CRYPT_OK) {
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60 *outlen = hash_descriptor[hash].hashsize;
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61 }
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62
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63 LBL_CLEANBUF:
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64 zeromem(buf, LTC_FILE_READ_BUFSIZE);
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65 LBL_ERR:
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66 XFREE(buf);
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67 return err;
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68 }
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69 #endif /* #ifndef LTC_NO_FILE */
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71
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72 /* ref: $Format:%D$ */
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73 /* git commit: $Format:%H$ */
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74 /* commit time: $Format:%ai$ */