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-rw-r--r--comm/third_party/libotr/toolkit/sha1hmac.c61
1 files changed, 61 insertions, 0 deletions
diff --git a/comm/third_party/libotr/toolkit/sha1hmac.c b/comm/third_party/libotr/toolkit/sha1hmac.c
new file mode 100644
index 0000000000..7cf82d6a10
--- /dev/null
+++ b/comm/third_party/libotr/toolkit/sha1hmac.c
@@ -0,0 +1,61 @@
+/*
+ * Off-the-Record Messaging Toolkit
+ * Copyright (C) 2004-2012 Ian Goldberg, Chris Alexander, Nikita Borisov
+ * <otr@cypherpunks.ca>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/* system headers */
+#include <stdio.h>
+#include <stdlib.h>
+
+/* libgcrypt headers */
+#include <gcrypt.h>
+
+/* Implementation of SHA1-HMAC. We're rolling our own just to
+ * double-check that the calls libotr makes to libgcrypt are in fact
+ * doing the right thing. */
+void sha1hmac(unsigned char digest[20], unsigned char key[20],
+ unsigned char *data, size_t datalen)
+{
+ unsigned char ipad[64], opad[64];
+ size_t i;
+ gcry_md_hd_t sha1;
+ gcry_error_t err;
+ unsigned char hash[20];
+
+ memset(ipad, 0, 64);
+ memset(opad, 0, 64);
+ memmove(ipad, key, 20);
+ memmove(opad, key, 20);
+ for(i=0;i<64;++i) {
+ ipad[i] ^= 0x36;
+ opad[i] ^= 0x5c;
+ }
+
+ err = gcry_md_open(&sha1, GCRY_MD_SHA1, 0);
+ if (err) {
+ fprintf(stderr, "Error: %s\n", gcry_strerror(err));
+ exit(1);
+ }
+ gcry_md_write(sha1, ipad, 64);
+ gcry_md_write(sha1, data, datalen);
+ memmove(hash, gcry_md_read(sha1, 0), 20);
+ gcry_md_reset(sha1);
+ gcry_md_write(sha1, opad, 64);
+ gcry_md_write(sha1, hash, 20);
+ memmove(digest, gcry_md_read(sha1, 0), 20);
+ gcry_md_close(sha1);
+}