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1 files changed, 78 insertions, 0 deletions

diff --git a/include/salticidae/crypto.h b/include/salticidae/crypto.h
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+++ b/include/salticidae/crypto.h
@@ -0,0 +1,78 @@
+/**
+ * Copyright (c) 2018 Cornell University.
+ *
+ * Author: Ted Yin <tederminant@gmail.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+ * of the Software, and to permit persons to whom the Software is furnished to do
+ * so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#ifndef _SALTICIDAE_CRYPTO_H
+#define _SALTICIDAE_CRYPTO_H
+
+#include "salticidae/type.h"
+#include <openssl/sha.h>
+
+namespace salticidae {
+
+class SHA256 {
+    SHA256_CTX *ctx;
+
+    public:
+    SHA256(): ctx(new SHA256_CTX()) { reset(); }
+    ~SHA256() { delete ctx; }
+
+    void reset() {
+        if (!SHA256_Init(ctx))
+            throw std::runtime_error("openssl SHA256 init error");
+    }
+
+    template<typename T>
+    void update(const T &data) {
+        update(reinterpret_cast<const uint8_t *>(&*data.begin()), data.size());
+    }
+
+    void update(const bytearray_t::const_iterator &it, size_t length) {
+        update(&*it, length);
+    }
+
+    void update(const uint8_t *ptr, size_t length) {
+        if (!SHA256_Update(ctx, ptr, length))
+            throw std::runtime_error("openssl SHA256 update error");
+    }
+
+    void _digest(bytearray_t &md) {
+        if (!SHA256_Final(&*md.begin(), ctx))
+            throw std::runtime_error("openssl SHA256 error");
+    }
+
+    void digest(bytearray_t &md) {
+        md.resize(32);
+        _digest(md);
+    }
+
+    bytearray_t digest() {
+        bytearray_t md(32);
+        _digest(md);
+        return std::move(md);
+    }
+};
+
+}
+
+#endif