1 files changed, 91 insertions, 0 deletions

diff --git a/toxencryptsave/crypto_pwhash_scryptsalsa208sha256/pbkdf2-sha256.c b/toxencryptsave/crypto_pwhash_scryptsalsa208sha256/pbkdf2-sha256.c
new file mode 100644
index 00000000..01eb7dff
--- /dev/null
+++ b/toxencryptsave/crypto_pwhash_scryptsalsa208sha256/pbkdf2-sha256.c
@@ -0,0 +1,91 @@
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+#ifdef  VANILLA_NACL /* toxcore only uses this when libsodium is unavailable */
+
+/*-
+ * Copyright 2005,2007,2009 Colin Percival
+ * 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 AUTHOR 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 AUTHOR 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.
+ */
+
+#include <sys/types.h>
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "crypto_auth_hmacsha256.h"
+#include "pbkdf2-sha256.h"
+#include "sysendian.h"
+#include "utils.h"
+
+/**
+ * PBKDF2_SHA256(passwd, passwdlen, salt, saltlen, c, buf, dkLen):
+ * Compute PBKDF2(passwd, salt, c, dkLen) using HMAC-SHA256 as the PRF, and
+ * write the output to buf.  The value dkLen must be at most 32 * (2^32 - 1).
+ */
+void
+PBKDF2_SHA256(const uint8_t * passwd, size_t passwdlen, const uint8_t * salt,
+              size_t saltlen, uint64_t c, uint8_t * buf, size_t dkLen)
+{
+        crypto_auth_hmacsha256_state PShctx, hctx;
+        size_t          i;
+        uint8_t         ivec[4];
+        uint8_t         U[32];
+        uint8_t         T[32];
+        uint64_t        j;
+        int             k;
+        size_t          clen;
+
+    crypto_auth_hmacsha256_init(&PShctx, passwd, passwdlen);
+    crypto_auth_hmacsha256_update(&PShctx, salt, saltlen);
+
+        for (i = 0; i * 32 < dkLen; i++) {
+                be32enc(ivec, (uint32_t)(i + 1));
+                memcpy(&hctx, &PShctx, sizeof(crypto_auth_hmacsha256_state));
+                crypto_auth_hmacsha256_update(&hctx, ivec, 4);
+                crypto_auth_hmacsha256_final(&hctx, U);
+
+                memcpy(T, U, 32);
+
+                for (j = 2; j <= c; j++) {
+                        crypto_auth_hmacsha256_init(&hctx, passwd, passwdlen);
+                        crypto_auth_hmacsha256_update(&hctx, U, 32);
+                        crypto_auth_hmacsha256_final(&hctx, U);
+
+                        for (k = 0; k < 32; k++) {
+                                T[k] ^= U[k];
+            }
+                }
+
+                clen = dkLen - i * 32;
+                if (clen > 32) {
+                        clen = 32;
+        }
+                memcpy(&buf[i * 32], T, clen);
+        }
+    sodium_memzero((void *) &PShctx, sizeof PShctx);
+}
+
+#endif