preparing to build tox from sources

1 files changed, 52 insertions, 0 deletions

diff --git a/libs/libsodium/src/crypto_kdf/blake2b/kdf_blake2b.c b/libs/libsodium/src/crypto_kdf/blake2b/kdf_blake2b.c
new file mode 100644
index 0000000000..2a690c9ac8
--- /dev/null
+++ b/libs/libsodium/src/crypto_kdf/blake2b/kdf_blake2b.c
@@ -0,0 +1,52 @@
+#include <errno.h>
+
+#include "crypto_kdf_blake2b.h"
+#include "crypto_generichash_blake2b.h"
+#include "private/common.h"
+
+size_t
+crypto_kdf_blake2b_bytes_min(void)
+{
+    return crypto_kdf_blake2b_BYTES_MIN;
+}
+
+size_t
+crypto_kdf_blake2b_bytes_max(void)
+{
+    return crypto_kdf_blake2b_BYTES_MAX;
+}
+
+size_t
+crypto_kdf_blake2b_contextbytes(void)
+{
+    return crypto_kdf_blake2b_CONTEXTBYTES;
+}
+
+size_t
+crypto_kdf_blake2b_keybytes(void)
+{
+    return crypto_kdf_blake2b_KEYBYTES;
+}
+
+int crypto_kdf_blake2b_derive_from_key(unsigned char *subkey, size_t subkey_len,
+                                       uint64_t subkey_id,
+                                       const char ctx[crypto_kdf_blake2b_CONTEXTBYTES],
+                                       const unsigned char key[crypto_kdf_blake2b_KEYBYTES])
+{
+    unsigned char ctx_padded[crypto_generichash_blake2b_PERSONALBYTES];
+    unsigned char salt[crypto_generichash_blake2b_SALTBYTES];
+
+    memcpy(ctx_padded, ctx, crypto_kdf_blake2b_CONTEXTBYTES);
+    memset(ctx_padded + crypto_kdf_blake2b_CONTEXTBYTES, 0, sizeof ctx_padded - crypto_kdf_blake2b_CONTEXTBYTES);
+    STORE64_LE(salt, subkey_id);
+    memset(salt + 8, 0, (sizeof salt) - 8);
+    if (subkey_len < crypto_kdf_blake2b_BYTES_MIN ||
+        subkey_len > crypto_kdf_blake2b_BYTES_MAX) {
+        errno = EINVAL;
+        return -1;
+    }
+    return crypto_generichash_blake2b_salt_personal(subkey, subkey_len,
+                                                    NULL, 0,
+                                                    key, crypto_kdf_blake2b_KEYBYTES,
+                                                    salt, ctx_padded);
+}