1 files changed, 71 insertions, 0 deletions
diff --git a/libtomcrypt/src/hashes/helper/hash_filehandle.c b/libtomcrypt/src/hashes/helper/hash_filehandle.c
new file mode 100644
index 0000000..be2cbf9
--- /dev/null
+++ b/libtomcrypt/src/hashes/helper/hash_filehandle.c
@@ -0,0 +1,71 @@
+/* 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://libtomcrypt.com
+ */
+#include "tomcrypt.h"
+
+/**
+   @file hash_filehandle.c
+   Hash open files, Tom St Denis
+*/
+
+/** 
+  Hash data from an open file handle.  
+  @param hash   The index of the hash you want to use
+  @param in     The FILE* handle of the file you want to hash
+  @param out    [out] The destination of the digest
+  @param outlen [in/out] The max size and resulting size of the digest
+  @result CRYPT_OK if successful   
+*/
+int hash_filehandle(int hash, FILE *in, unsigned char *out, unsigned long *outlen)
+{
+#ifdef LTC_NO_FILE
+    return CRYPT_NOP;
+#else
+    hash_state md;
+    unsigned char buf[512];
+    size_t x;
+    int err;
+
+    LTC_ARGCHK(out    != NULL);
+    LTC_ARGCHK(outlen != NULL);
+    LTC_ARGCHK(in     != NULL);
+
+    if ((err = hash_is_valid(hash)) != CRYPT_OK) {
+        return err;
+    }
+
+    if (*outlen < hash_descriptor[hash].hashsize) {
+       *outlen = hash_descriptor[hash].hashsize;
+       return CRYPT_BUFFER_OVERFLOW;
+    }
+    if ((err = hash_descriptor[hash].init(&md)) != CRYPT_OK) {
+       return err;
+    }
+
+    *outlen = hash_descriptor[hash].hashsize;
+    do {
+        x = fread(buf, 1, sizeof(buf), in);
+        if ((err = hash_descriptor[hash].process(&md, buf, x)) != CRYPT_OK) {
+           return err;
+        }
+    } while (x == sizeof(buf));
+    err = hash_descriptor[hash].done(&md, out);
+
+#ifdef LTC_CLEAN_STACK
+    zeromem(buf, sizeof(buf));
+#endif
+    return err;
+#endif
+}
+
+
+/* $Source: /cvs/libtom/libtomcrypt/src/hashes/helper/hash_filehandle.c,v $ */
+/* $Revision: 1.5 $ */
+/* $Date: 2006/06/16 21:53:41 $ */