X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=libtomcrypt%2Fsrc%2Fhashes%2Fhelper%2Fhash_filehandle.c;fp=libtomcrypt%2Fsrc%2Fhashes%2Fhelper%2Fhash_filehandle.c;h=0e4d7a64c7619d42cae593672840151bdd17399e;hb=66bc25938679f1d6a1d1200f329093d82a5e99b4;hp=0000000000000000000000000000000000000000;hpb=a52ee0733f420ca20224049260d6fc5cf7d8f621;p=zpackage

diff --git a/libtomcrypt/src/hashes/helper/hash_filehandle.c b/libtomcrypt/src/hashes/helper/hash_filehandle.c
new file mode 100644
index 0000000..0e4d7a6
--- /dev/null
+++ b/libtomcrypt/src/hashes/helper/hash_filehandle.c
@@ -0,0 +1,74 @@
+/* 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.
+ */
+#include "tomcrypt.h"
+
+#ifndef LTC_NO_FILE
+/**
+   @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)
+{
+    hash_state md;
+    unsigned char *buf;
+    size_t x;
+    int err;
+
+    LTC_ARGCHK(out    != NULL);
+    LTC_ARGCHK(outlen != NULL);
+    LTC_ARGCHK(in     != NULL);
+
+    if ((buf = XMALLOC(LTC_FILE_READ_BUFSIZE)) == NULL) {
+        return CRYPT_MEM;
+    }
+
+    if ((err = hash_is_valid(hash)) != CRYPT_OK) {
+        goto LBL_ERR;
+    }
+
+    if (*outlen < hash_descriptor[hash].hashsize) {
+       *outlen = hash_descriptor[hash].hashsize;
+       err = CRYPT_BUFFER_OVERFLOW;
+       goto LBL_ERR;
+    }
+    if ((err = hash_descriptor[hash].init(&md)) != CRYPT_OK) {
+       goto LBL_ERR;
+    }
+
+    do {
+        x = fread(buf, 1, LTC_FILE_READ_BUFSIZE, in);
+        if ((err = hash_descriptor[hash].process(&md, buf, (unsigned long)x)) != CRYPT_OK) {
+           goto LBL_CLEANBUF;
+        }
+    } while (x == LTC_FILE_READ_BUFSIZE);
+    if ((err = hash_descriptor[hash].done(&md, out)) == CRYPT_OK) {
+       *outlen = hash_descriptor[hash].hashsize;
+    }
+
+LBL_CLEANBUF:
+    zeromem(buf, LTC_FILE_READ_BUFSIZE);
+LBL_ERR:
+    XFREE(buf);
+    return err;
+}
+#endif /* #ifndef LTC_NO_FILE */
+
+
+/* ref:         $Format:%D$ */
+/* git commit:  $Format:%H$ */
+/* commit time: $Format:%ai$ */