1 files changed, 95 insertions, 0 deletions
diff --git a/libs/libsodium/src/crypto_pwhash/scryptsalsa208sha256/pbkdf2-sha256.c b/libs/libsodium/src/crypto_pwhash/scryptsalsa208sha256/pbkdf2-sha256.c
new file mode 100644
index 0000000000..42cab61fe2
--- /dev/null
+++ b/libs/libsodium/src/crypto_pwhash/scryptsalsa208sha256/pbkdf2-sha256.c
@@ -0,0 +1,95 @@
+/*-
+ * 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 <limits.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <sys/types.h>
+
+#include "core.h"
+#include "crypto_auth_hmacsha256.h"
+#include "crypto_pwhash_scryptsalsa208sha256.h"
+#include "pbkdf2-sha256.h"
+#include "private/common.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;
+
+#if SIZE_MAX > 0x1fffffffe0ULL
+    COMPILER_ASSERT(crypto_pwhash_scryptsalsa208sha256_BYTES_MAX
+                    <= 0x1fffffffe0ULL);
+    if (dkLen > 0x1fffffffe0ULL) {
+        sodium_misuse(); /* LCOV_EXCL_LINE */
+    }
+#endif
+    crypto_auth_hmacsha256_init(&PShctx, passwd, passwdlen);
+    crypto_auth_hmacsha256_update(&PShctx, salt, saltlen);
+
+    for (i = 0; i * 32 < dkLen; i++) {
+        STORE32_BE(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);
+        /* LCOV_EXCL_START */
+        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];
+            }
+        }
+        /* LCOV_EXCL_STOP */
+
+        clen = dkLen - i * 32;
+        if (clen > 32) {
+            clen = 32;
+        }
+        memcpy(&buf[i * 32], T, clen);
+    }
+    sodium_memzero((void *) &PShctx, sizeof PShctx);
+}