1 files changed, 135 insertions, 0 deletions
diff --git a/core/lib/libtomcrypt/src/mac/hmac/hmac_done.c b/core/lib/libtomcrypt/src/mac/hmac/hmac_done.c
new file mode 100644
index 0000000..5b9e738
--- /dev/null
+++ b/core/lib/libtomcrypt/src/mac/hmac/hmac_done.c
@@ -0,0 +1,135 @@
+/*
+ * Copyright (c) 2001-2007, Tom St Denis
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/* LibTomCrypt, modular cryptographic library -- Tom St Denis
+ *
+ * LibTomCrypt is a library that provides various cryptographic
+ * algorithms in a highly modular and flexible manner.
+ *
+ * The library is free for all purposes without any express
+ * guarantee it works.
+ *
+ * Tom St Denis, tomstdenis@gmail.com, http://libtom.org
+ */
+#include "tomcrypt.h"
+
+/**
+  @file hmac_done.c
+  LTC_HMAC support, terminate stream, Tom St Denis/Dobes Vandermeer
+*/
+
+#ifdef LTC_HMAC
+
+#define LTC_HMAC_BLOCKSIZE hash_descriptor[hash]->blocksize
+
+/**
+   Terminate an LTC_HMAC session
+   @param hmac    The LTC_HMAC state
+   @param out     [out] The destination of the LTC_HMAC authentication tag
+   @param outlen  [in/out]  The max size and resulting size of the LTC_HMAC authentication tag
+   @return CRYPT_OK if successful
+*/
+int hmac_done(hmac_state *hmac, unsigned char *out, unsigned long *outlen)
+{
+    unsigned char *buf, *isha;
+    unsigned long hashsize, i;
+    int hash, err;
+
+    LTC_ARGCHK(hmac  != NULL);
+    LTC_ARGCHK(out   != NULL);
+
+    /* test hash */
+    hash = hmac->hash;
+    if((err = hash_is_valid(hash)) != CRYPT_OK) {
+        return err;
+    }
+
+    /* get the hash message digest size */
+    hashsize = hash_descriptor[hash]->hashsize;
+
+    /* allocate buffers */
+    buf  = XMALLOC(LTC_HMAC_BLOCKSIZE);
+    isha = XMALLOC(hashsize);
+    if (buf == NULL || isha == NULL) { 
+       if (buf != NULL) {
+          XFREE(buf);
+       } 
+       if (isha != NULL) {
+          XFREE(isha);
+       }  
+       return CRYPT_MEM;
+    }
+
+    /* Get the hash of the first LTC_HMAC vector plus the data */
+    if ((err = hash_descriptor[hash]->done(&hmac->md, isha)) != CRYPT_OK) {
+       goto LBL_ERR;
+    }
+
+    /* Create the second LTC_HMAC vector vector for step (3) */
+    for(i=0; i < LTC_HMAC_BLOCKSIZE; i++) {
+        buf[i] = hmac->key[i] ^ 0x5C;
+    }
+
+    /* Now calculate the "outer" hash for step (5), (6), and (7) */
+    if ((err = hash_descriptor[hash]->init(&hmac->md)) != CRYPT_OK) {
+       goto LBL_ERR;
+    }
+    if ((err = hash_descriptor[hash]->process(&hmac->md, buf, LTC_HMAC_BLOCKSIZE)) != CRYPT_OK) {
+       goto LBL_ERR;
+    }
+    if ((err = hash_descriptor[hash]->process(&hmac->md, isha, hashsize)) != CRYPT_OK) {
+       goto LBL_ERR;
+    }
+    if ((err = hash_descriptor[hash]->done(&hmac->md, buf)) != CRYPT_OK) {
+       goto LBL_ERR;
+    }
+
+    /* copy to output  */
+    for (i = 0; i < hashsize && i < *outlen; i++) {
+        out[i] = buf[i];
+    }
+    *outlen = i;
+
+    err = CRYPT_OK;
+LBL_ERR:
+#ifdef LTC_CLEAN_STACK
+    zeromem(isha, hashsize);
+    zeromem(buf,  hashsize);
+    zeromem(hmac, sizeof(*hmac));
+#endif
+
+    XFREE(isha);
+    XFREE(buf);
+
+    return err;
+}
+
+#endif
+
+/* $Source: /cvs/libtom/libtomcrypt/src/mac/hmac/hmac_done.c,v $ */
+/* $Revision: 1.7 $ */
+/* $Date: 2007/05/12 14:37:41 $ */