2 files changed, 128 insertions, 0 deletions
diff --git a/libs/libsodium/src/crypto_stream/salsa20/ref/salsa20_ref.c b/libs/libsodium/src/crypto_stream/salsa20/ref/salsa20_ref.c
new file mode 100644
index 0000000000..f0854ebf7e
--- /dev/null
+++ b/libs/libsodium/src/crypto_stream/salsa20/ref/salsa20_ref.c
@@ -0,0 +1,120 @@
+/*
+version 20140420
+D. J. Bernstein
+Public domain.
+*/
+
+#include <stdint.h>
+
+#include "crypto_core_salsa20.h"
+#include "crypto_stream_salsa20.h"
+#include "utils.h"
+
+#include "../stream_salsa20.h"
+#include "salsa20_ref.h"
+
+#ifndef HAVE_AMD64_ASM
+
+static int
+stream_ref(unsigned char *c, unsigned long long clen, const unsigned char *n,
+           const unsigned char *k)
+{
+    unsigned char in[16];
+    unsigned char block[64];
+    unsigned char kcopy[32];
+    unsigned int  i;
+    unsigned int  u;
+
+    if (!clen) {
+        return 0;
+    }
+    for (i = 0; i < 32; i++) {
+        kcopy[i] = k[i];
+    }
+    for (i = 0; i < 8; i++) {
+        in[i] = n[i];
+    }
+    for (i = 8; i < 16; i++) {
+        in[i] = 0;
+    }
+    while (clen >= 64) {
+        crypto_core_salsa20(c, in, kcopy, NULL);
+        u = 1;
+        for (i = 8; i < 16; i++) {
+            u += (unsigned int) in[i];
+            in[i] = u;
+            u >>= 8;
+        }
+        clen -= 64;
+        c += 64;
+    }
+    if (clen) {
+        crypto_core_salsa20(block, in, kcopy, NULL);
+        for (i = 0; i < (unsigned int) clen; i++) {
+            c[i] = block[i];
+        }
+    }
+    sodium_memzero(block, sizeof block);
+    sodium_memzero(kcopy, sizeof kcopy);
+
+    return 0;
+}
+
+static int
+stream_ref_xor_ic(unsigned char *c, const unsigned char *m,
+                  unsigned long long mlen, const unsigned char *n, uint64_t ic,
+                  const unsigned char *k)
+{
+    unsigned char in[16];
+    unsigned char block[64];
+    unsigned char kcopy[32];
+    unsigned int  i;
+    unsigned int  u;
+
+    if (!mlen) {
+        return 0;
+    }
+    for (i = 0; i < 32; i++) {
+        kcopy[i] = k[i];
+    }
+    for (i = 0; i < 8; i++) {
+        in[i] = n[i];
+    }
+    for (i = 8; i < 16; i++) {
+        in[i] = (unsigned char) (ic & 0xff);
+        ic >>= 8;
+    }
+    while (mlen >= 64) {
+        crypto_core_salsa20(block, in, kcopy, NULL);
+        for (i = 0; i < 64; i++) {
+            c[i] = m[i] ^ block[i];
+        }
+        u = 1;
+        for (i = 8; i < 16; i++) {
+            u += (unsigned int) in[i];
+            in[i] = u;
+            u >>= 8;
+        }
+        mlen -= 64;
+        c += 64;
+        m += 64;
+    }
+    if (mlen) {
+        crypto_core_salsa20(block, in, kcopy, NULL);
+        for (i = 0; i < (unsigned int) mlen; i++) {
+            c[i] = m[i] ^ block[i];
+        }
+    }
+    sodium_memzero(block, sizeof block);
+    sodium_memzero(kcopy, sizeof kcopy);
+
+    return 0;
+}
+
+struct crypto_stream_salsa20_implementation
+    crypto_stream_salsa20_ref_implementation = {
+        SODIUM_C99(.stream =) stream_ref,
+        SODIUM_C99(.stream_xor_ic =) stream_ref_xor_ic,
+    };
+
+#endif
diff --git a/libs/libsodium/src/crypto_stream/salsa20/ref/salsa20_ref.h b/libs/libsodium/src/crypto_stream/salsa20/ref/salsa20_ref.h
new file mode 100644
index 0000000000..8716cb4048
--- /dev/null
+++ b/libs/libsodium/src/crypto_stream/salsa20/ref/salsa20_ref.h
@@ -0,0 +1,8 @@
+
+#include <stdint.h>
+
+#include "../stream_salsa20.h"
+#include "crypto_stream_salsa20.h"
+
+extern struct crypto_stream_salsa20_implementation
+    crypto_stream_salsa20_ref_implementation;