1 /* 2 * iterated_hash.c -- nsec3 hash calculation. 3 * 4 * Copyright (c) 2001-2011, NLnet Labs. All rights reserved. 5 * 6 * See LICENSE for the license. 7 * 8 * With thanks to Ben Laurie. 9 */ 10 #include <config.h> 11 #ifdef NSEC3 12 #include <openssl/sha.h> 13 #include <stdio.h> 14 #include <assert.h> 15 16 #include "iterated_hash.h" 17 18 int 19 iterated_hash(unsigned char out[SHA_DIGEST_LENGTH], 20 const unsigned char *salt, int saltlength, 21 const unsigned char *in, int inlength, int iterations) 22 { 23 #if defined(NSEC3) && defined(HAVE_SSL) 24 SHA_CTX ctx; 25 int n; 26 assert(in && inlength > 0 && iterations >= 0); 27 for(n=0 ; n <= iterations ; ++n) 28 { 29 SHA1_Init(&ctx); 30 SHA1_Update(&ctx, in, inlength); 31 if(saltlength > 0) 32 SHA1_Update(&ctx, salt, saltlength); 33 SHA1_Final(out, &ctx); 34 in=out; 35 inlength=SHA_DIGEST_LENGTH; 36 } 37 return SHA_DIGEST_LENGTH; 38 #else 39 return 0; 40 #endif 41 } 42 43 #endif /* NSEC3 */ 44