LibCrypto: Add a Hash::Manager that can act as any one of the hashes

5 files changed, 324 insertions, 4 deletions

diff --git a/Libraries/LibCrypto/Hash/HashFunction.h b/Libraries/LibCrypto/Hash/HashFunction.h
index 19c2f0db05..e6d5887484 100644
--- a/Libraries/LibCrypto/Hash/HashFunction.h
+++ b/Libraries/LibCrypto/Hash/HashFunction.h
@@ -37,7 +37,7 @@ template<size_t BlockS, typename DigestT>
 class HashFunction {
 public:
     static constexpr auto BlockSize = BlockS / 8;
-    static constexpr auto DigestSize = sizeof(DigestT);
+    static constexpr auto DigestSize = DigestT::Size;
 
     using DigestType = DigestT;
 
@@ -45,8 +45,8 @@ public:
     static size_t digest_size() { return DigestSize; };
 
     virtual void update(const u8*, size_t) = 0;
-    virtual void update(const ByteBuffer& buffer) = 0;
-    virtual void update(const StringView& string) = 0;
+    virtual void update(const ByteBuffer& buffer) { update(buffer.data(), buffer.size()); };
+    virtual void update(const StringView& string) { update((const u8*)string.characters_without_null_termination(), string.length()); };
 
     virtual DigestType peek() = 0;
     virtual DigestType digest() = 0;
diff --git a/Libraries/LibCrypto/Hash/HashManager.h b/Libraries/LibCrypto/Hash/HashManager.h
new file mode 100644
index 0000000000..fb01db77b9
--- /dev/null
+++ b/Libraries/LibCrypto/Hash/HashManager.h
@@ -0,0 +1,309 @@
+/*
+ * Copyright (c) 2020, Ali Mohammad Pur <ali.mpfard@gmail.com>
+ * 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 COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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.
+ */
+
+#pragma once
+
+#include <AK/Optional.h>
+#include <LibCrypto/Hash/HashFunction.h>
+#include <LibCrypto/Hash/MD5.h>
+#include <LibCrypto/Hash/SHA1.h>
+#include <LibCrypto/Hash/SHA2.h>
+
+namespace Crypto {
+namespace Hash {
+
+enum class HashKind {
+    None,
+    SHA1,
+    SHA256,
+    SHA512,
+    MD5,
+};
+
+struct MultiHashDigestVariant {
+
+    constexpr static size_t Size = 0;
+
+    MultiHashDigestVariant(SHA1::DigestType digest)
+        : sha1(digest)
+        , kind(HashKind::SHA1)
+    {
+    }
+
+    MultiHashDigestVariant(SHA256::DigestType digest)
+        : sha256(digest)
+        , kind(HashKind::SHA256)
+    {
+    }
+
+    MultiHashDigestVariant(SHA512::DigestType digest)
+        : sha512(digest)
+        , kind(HashKind::SHA512)
+    {
+    }
+
+    MultiHashDigestVariant(MD5::DigestType digest)
+        : md5(digest)
+        , kind(HashKind::MD5)
+    {
+    }
+
+    const u8* immutable_data() const
+    {
+        switch (kind) {
+        case HashKind::MD5:
+            return md5.value().immutable_data();
+        case HashKind::SHA1:
+            return sha1.value().immutable_data();
+        case HashKind::SHA256:
+            return sha256.value().immutable_data();
+        case HashKind::SHA512:
+            return sha512.value().immutable_data();
+        default:
+        case HashKind::None:
+            ASSERT_NOT_REACHED();
+            break;
+        }
+    }
+
+    size_t data_length()
+    {
+        switch (kind) {
+        case HashKind::MD5:
+            return md5.value().data_length();
+        case HashKind::SHA1:
+            return sha1.value().data_length();
+        case HashKind::SHA256:
+            return sha256.value().data_length();
+        case HashKind::SHA512:
+            return sha512.value().data_length();
+        default:
+        case HashKind::None:
+            ASSERT_NOT_REACHED();
+            break;
+        }
+    }
+
+    Optional<SHA1::DigestType> sha1;
+    Optional<SHA256::DigestType> sha256;
+    Optional<SHA512::DigestType> sha512;
+    Optional<MD5::DigestType> md5;
+    HashKind kind { HashKind::None };
+};
+
+class Manager final : public HashFunction<0, MultiHashDigestVariant> {
+public:
+    Manager()
+    {
+        m_pre_init_buffer = ByteBuffer::create_zeroed(0);
+    }
+
+    Manager(const Manager& other) // NOT a copy constructor!
+    {
+        m_pre_init_buffer = ByteBuffer::create_zeroed(0); // will not be used
+        initialise(other.m_kind);
+    }
+
+    Manager(HashKind kind)
+    {
+        m_pre_init_buffer = ByteBuffer::create_zeroed(0);
+        initialize(kind);
+    }
+
+    ~Manager()
+    {
+    }
+
+    virtual void update(const ByteBuffer& buffer) override { update(buffer.data(), buffer.size()); };
+    virtual void update(const StringView& string) override { update((const u8*)string.characters_without_null_termination(), string.length()); };
+    inline size_t digest_size() const
+    {
+        switch (m_kind) {
+        case HashKind::MD5:
+            return md5.value().digest_size();
+        case HashKind::SHA1:
+            return sha1.value().digest_size();
+        case HashKind::SHA256:
+            return sha256.value().digest_size();
+        case HashKind::SHA512:
+            return sha512.value().digest_size();
+        default:
+        case HashKind::None:
+            return 0;
+        }
+    }
+    inline size_t block_size() const
+    {
+        switch (m_kind) {
+        case HashKind::MD5:
+            return m_md5->block_size();
+        case HashKind::SHA1:
+            return m_sha1->block_size();
+        case HashKind::SHA256:
+            return m_sha256->block_size();
+        case HashKind::SHA512:
+            return m_sha512->block_size();
+        default:
+        case HashKind::None:
+            return 0;
+        }
+    }
+    inline void initialize(HashKind kind)
+    {
+        if (m_kind != HashKind::None) {
+            ASSERT_NOT_REACHED();
+        }
+
+        m_kind = kind;
+        switch (kind) {
+        case HashKind::MD5:
+            md5 = MD5 {};
+            break;
+        case HashKind::SHA1:
+            sha1 = SHA1 {};
+            break;
+        case HashKind::SHA256:
+            sha256 = SHA256 {};
+            break;
+        case HashKind::SHA512:
+            sha512 = SHA512 {};
+            break;
+        default:
+        case HashKind::None:
+            break;
+        }
+    }
+
+    virtual void update(const u8* data, size_t length) override
+    {
+        switch (m_kind) {
+        case HashKind::MD5:
+            if (m_pre_init_buffer.size())
+                md5.value().update(m_pre_init_buffer);
+            md5.value().update(data, length);
+            break;
+        case HashKind::SHA1:
+            if (m_pre_init_buffer.size())
+                sha1.value().update(m_pre_init_buffer);
+            sha1.value().update(data, length);
+            break;
+        case HashKind::SHA256:
+            if (m_pre_init_buffer.size())
+                sha256.value().update(m_pre_init_buffer);
+            sha256.value().update(data, length);
+            break;
+        case HashKind::SHA512:
+            if (m_pre_init_buffer.size())
+                sha512.value().update(m_pre_init_buffer);
+            sha512.value().update(data, length);
+            break;
+        default:
+        case HashKind::None:
+            m_pre_init_buffer.append(data, length);
+            return;
+        }
+        m_pre_init_buffer.clear();
+    }
+
+    virtual DigestType peek() override
+    {
+        switch (m_kind) {
+        case HashKind::MD5:
+            return { md5.value().peek() };
+        case HashKind::SHA1:
+            return { sha1.value().peek() };
+        case HashKind::SHA256:
+            return { sha256.value().peek() };
+        case HashKind::SHA512:
+            return { sha512.value().peek() };
+        default:
+        case HashKind::None:
+            ASSERT_NOT_REACHED();
+            break;
+        }
+    }
+
+    virtual DigestType digest() override
+    {
+        auto digest = peek();
+        reset();
+        return digest;
+    }
+
+    virtual void reset() override
+    {
+        switch (m_kind) {
+        case HashKind::MD5:
+            md5.value().reset();
+            break;
+        case HashKind::SHA1:
+            sha1.value().reset();
+            break;
+        case HashKind::SHA256:
+            sha256.value().reset();
+            break;
+        case HashKind::SHA512:
+            sha512.value().reset();
+            break;
+        default:
+        case HashKind::None:
+            break;
+        }
+    }
+
+    virtual String class_name() const override
+    {
+        switch (m_kind) {
+        case HashKind::MD5:
+            return md5.value().class_name();
+        case HashKind::SHA1:
+            return sha1.value().class_name();
+        case HashKind::SHA256:
+            return sha256.value().class_name();
+        case HashKind::SHA512:
+            return sha512.value().class_name();
+        default:
+        case HashKind::None:
+            return "UninitializedHashManager";
+        }
+    }
+
+    inline bool is(HashKind kind) const
+    {
+        return m_kind == kind;
+    }
+
+private:
+    Optional<SHA1> sha1;
+    Optional<SHA256> sha256;
+    Optional<SHA512> sha512;
+    Optional<MD5> md5;
+    HashKind m_kind { HashKind::None };
+    ByteBuffer m_pre_init_buffer;
+};
+
+}
+}
diff --git a/Libraries/LibCrypto/Hash/MD5.h b/Libraries/LibCrypto/Hash/MD5.h
index 883029527c..3219cb9260 100644
--- a/Libraries/LibCrypto/Hash/MD5.h
+++ b/Libraries/LibCrypto/Hash/MD5.h
@@ -34,7 +34,11 @@ namespace Crypto {
 namespace Hash {
 
 struct MD5Digest {
-    u8 data[16];
+    constexpr static size_t Size = 16;
+    u8 data[Size];
+
+    const u8* immutable_data() const { return data; }
+    size_t data_length() { return Size; }
 };
 
 namespace MD5Constants {
diff --git a/Libraries/LibCrypto/Hash/SHA1.h b/Libraries/LibCrypto/Hash/SHA1.h
index fd15c6b962..bb37296612 100644
--- a/Libraries/LibCrypto/Hash/SHA1.h
+++ b/Libraries/LibCrypto/Hash/SHA1.h
@@ -48,6 +48,10 @@ constexpr static u32 RoundConstants[4] {
 template<size_t Bytes>
 struct SHA1Digest {
     u8 data[Bytes];
+    constexpr static size_t Size = Bytes;
+
+    const u8* immutable_data() const { return data; }
+    size_t data_length() { return Bytes; }
 };
 
 class SHA1 final : public HashFunction<512, SHA1Digest<160 / 8>> {
diff --git a/Libraries/LibCrypto/Hash/SHA2.h b/Libraries/LibCrypto/Hash/SHA2.h
index 2437cc17cc..ebb38d9888 100644
--- a/Libraries/LibCrypto/Hash/SHA2.h
+++ b/Libraries/LibCrypto/Hash/SHA2.h
@@ -88,6 +88,9 @@ constexpr static u64 InitializationHashes[8] = {
 template<size_t Bytes>
 struct SHA2Digest {
     u8 data[Bytes];
+    constexpr static size_t Size = Bytes;
+    const u8* immutable_data() const { return data; }
+    size_t data_length() { return Bytes; }
 };
 
 // FIXME: I want template<size_t BlockSize> but the compiler gets confused