add sphincs

crypto/sphincs/primitives/aes.c

@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2017 Nagravision S.A.
+ */
+
+#include "../aes.h"
+#include <openssl/conf.h>
+#include <openssl/err.h>
+#include <openssl/evp.h>
+#include <stdio.h>
+#include <string.h>
+
+
+int aesctr256 (uint8_t *out, const uint8_t *sk, const void *counter, int bytes) {
+    static const uint8_t buffer[4096] = { 0 };
+    EVP_CIPHER_CTX *ctx;
+    int len = 0;
+    int ret = 0;
+
+    if (bytes == 0) return 0;
+
+    if (!(ctx = EVP_CIPHER_CTX_new ())) {
+        ret = -2;
+        goto label_exit_0;
+    }
+
+    if (1 != EVP_EncryptInit_ex (ctx, EVP_aes_256_ctr (), NULL, sk, counter)) {
+        ret = -3;
+        goto label_exit_1;
+    }
+
+    while (bytes >= (int)sizeof (buffer)) {
+        if (1 != EVP_EncryptUpdate (ctx, out, &len, buffer, sizeof (buffer))) {
+            ret = -4;
+            goto label_exit_1;
+        }
+        out += sizeof (buffer);
+        bytes -= sizeof (buffer);
+    }
+    if (bytes) {
+        if (1 != EVP_EncryptUpdate (ctx, out, &len, buffer, bytes)) {
+            ret = -4;
+            goto label_exit_1;
+        }
+    }
+
+    if (1 != EVP_EncryptFinal_ex (ctx, out + len, &len)) {
+        ret = -5;
+        goto label_exit_1;
+    }
+
+    ret = 0;
+label_exit_1:
+    EVP_CIPHER_CTX_free (ctx);
+label_exit_0:
+    return ret;
+}
+
+int aesctr256_zeroiv (uint8_t *out, const uint8_t *sk, int bytes) {
+    uint8_t counter[16] = {0};
+    return aesctr256(out, sk, counter, bytes);
+}