/*
digest.c -- Digest handling
- Copyright (C) 2007 Guus Sliepen <guus@tinc-vpn.org>
+ Copyright (C) 2007-2016 Guus Sliepen <guus@tinc-vpn.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
-#include "system.h"
-#include "utils.h"
-#include "xalloc.h"
+#include "../system.h"
#include <openssl/err.h>
#include <openssl/hmac.h>
#include "digest.h"
-#include "logger.h"
+#include "../digest.h"
+#include "../logger.h"
-static void set_maclength(digest_t *digest, int maclength) {
- int digestlen = EVP_MD_size(digest->digest);
+static void digest_open(digest_t *digest, const EVP_MD *evp_md, size_t maclength) {
+ digest->digest = evp_md;
- if(maclength > digestlen || maclength < 0)
+ size_t digestlen = EVP_MD_size(digest->digest);
+
+ if(maclength == DIGEST_ALGO_SIZE || maclength > digestlen) {
digest->maclength = digestlen;
- else
+ } else {
digest->maclength = maclength;
+ }
}
-bool digest_open_by_name(digest_t *digest, const char *name, int maclength) {
- digest->digest = EVP_get_digestbyname(name);
- digest->key = NULL;
+bool digest_open_by_name(digest_t *digest, const char *name, size_t maclength) {
+ const EVP_MD *evp_md = EVP_get_digestbyname(name);
- if(!digest->digest) {
+ if(!evp_md) {
logger(DEBUG_ALWAYS, LOG_DEBUG, "Unknown digest name '%s'!", name);
return false;
}
- set_maclength(digest, maclength);
+ digest_open(digest, evp_md, maclength);
return true;
}
-bool digest_open_by_nid(digest_t *digest, int nid, int maclength) {
- digest->digest = EVP_get_digestbynid(nid);
- digest->key = NULL;
+bool digest_open_by_nid(digest_t *digest, int nid, size_t maclength) {
+ const EVP_MD *evp_md = EVP_get_digestbynid(nid);
- if(!digest->digest) {
+ if(!evp_md) {
logger(DEBUG_ALWAYS, LOG_DEBUG, "Unknown digest nid %d!", nid);
return false;
}
- set_maclength(digest, maclength);
+ digest_open(digest, evp_md, maclength);
return true;
}
-bool digest_open_sha1(digest_t *digest, int maclength) {
- digest->digest = EVP_sha1();
- digest->key = NULL;
+bool digest_set_key(digest_t *digest, const void *key, size_t len) {
+ digest->hmac_ctx = HMAC_CTX_new();
+ HMAC_Init_ex(digest->hmac_ctx, key, (int)len, digest->digest, NULL);
- set_maclength(digest, maclength);
- return true;
-}
+ if(!digest->hmac_ctx) {
+ abort();
+ }
-bool digest_set_key(digest_t *digest, const void *key, size_t len) {
- digest->key = xrealloc(digest->key, len);
- memcpy(digest->key, key, len);
- digest->keylength = len;
return true;
}
void digest_close(digest_t *digest) {
- free(digest->key);
- digest->key = NULL;
+ if(!digest) {
+ return;
+ }
+
+ if(digest->md_ctx) {
+ EVP_MD_CTX_destroy(digest->md_ctx);
+ }
+
+ if(digest->hmac_ctx) {
+ HMAC_CTX_free(digest->hmac_ctx);
+ }
+
+ memset(digest, 0, sizeof(*digest));
}
bool digest_create(digest_t *digest, const void *indata, size_t inlen, void *outdata) {
size_t len = EVP_MD_size(digest->digest);
unsigned char tmpdata[len];
- if(digest->key) {
- HMAC(digest->digest, digest->key, digest->keylength, indata, inlen, tmpdata, NULL);
+ if(digest->hmac_ctx) {
+ if(!HMAC_Init_ex(digest->hmac_ctx, NULL, 0, NULL, NULL)
+ || !HMAC_Update(digest->hmac_ctx, indata, inlen)
+ || !HMAC_Final(digest->hmac_ctx, tmpdata, NULL)) {
+ logger(DEBUG_ALWAYS, LOG_DEBUG, "Error creating digest: %s", ERR_error_string(ERR_get_error(), NULL));
+ return false;
+ }
} else {
- EVP_MD_CTX ctx;
+ if(!digest->md_ctx) {
+ digest->md_ctx = EVP_MD_CTX_create();
+ }
+
+ if(!digest->md_ctx) {
+ abort();
+ }
- if(!EVP_DigestInit(&ctx, digest->digest)
- || !EVP_DigestUpdate(&ctx, indata, inlen)
- || !EVP_DigestFinal(&ctx, tmpdata, NULL)) {
+ if(!EVP_DigestInit(digest->md_ctx, digest->digest)
+ || !EVP_DigestUpdate(digest->md_ctx, indata, inlen)
+ || !EVP_DigestFinal(digest->md_ctx, tmpdata, NULL)) {
logger(DEBUG_ALWAYS, LOG_DEBUG, "Error creating digest: %s", ERR_error_string(ERR_get_error(), NULL));
return false;
}
}
int digest_get_nid(const digest_t *digest) {
- return digest->digest ? digest->digest->type : 0;
+ if(!digest || !digest->digest) {
+ return 0;
+ }
+
+ return EVP_MD_type(digest->digest);
}
size_t digest_keylength(const digest_t *digest) {
- return digest->digest->md_size;
+ if(!digest || !digest->digest) {
+ return 0;
+ }
+
+ return EVP_MD_size(digest->digest);
}
size_t digest_length(const digest_t *digest) {
+ if(!digest) {
+ return 0;
+ }
+
return digest->maclength;
}
bool digest_active(const digest_t *digest) {
- return digest->digest && digest->digest->type != 0;
+ return digest && digest->digest && EVP_MD_type(digest->digest) != 0;
}