1 files changed, 129 insertions, 0 deletions
diff --git a/comm/third_party/botan/src/lib/modes/aead/siv/siv.h b/comm/third_party/botan/src/lib/modes/aead/siv/siv.h
new file mode 100644
index 0000000000..c76fd32296
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+++ b/comm/third_party/botan/src/lib/modes/aead/siv/siv.h
@@ -0,0 +1,129 @@
+/*
+* SIV Mode
+* (C) 2013 Jack Lloyd
+* (C) 2016 Daniel Neus, Rohde & Schwarz Cybersecurity
+*
+* Botan is released under the Simplified BSD License (see license.txt)
+*/
+
+#ifndef BOTAN_AEAD_SIV_H_
+#define BOTAN_AEAD_SIV_H_
+
+#include <botan/aead.h>
+#include <botan/stream_cipher.h>
+
+BOTAN_FUTURE_INTERNAL_HEADER(siv.h)
+
+namespace Botan {
+
+class BlockCipher;
+class MessageAuthenticationCode;
+
+/**
+* Base class for SIV encryption and decryption (@see RFC 5297)
+*/
+class BOTAN_PUBLIC_API(2,0) SIV_Mode : public AEAD_Mode
+   {
+   public:
+      size_t process(uint8_t buf[], size_t size) override;
+
+      /**
+      * Sets the nth element of the vector of associated data
+      * @param n index into the AD vector
+      * @param ad associated data
+      * @param ad_len length of associated data in bytes
+      */
+      void set_associated_data_n(size_t n, const uint8_t ad[], size_t ad_len) override;
+
+      size_t maximum_associated_data_inputs() const override;
+
+      void set_associated_data(const uint8_t ad[], size_t ad_len) override
+         {
+         set_associated_data_n(0, ad, ad_len);
+         }
+
+      std::string name() const override;
+
+      size_t update_granularity() const override;
+
+      Key_Length_Specification key_spec() const override;
+
+      bool valid_nonce_length(size_t) const override;
+
+      void clear() override;
+
+      void reset() override;
+
+      size_t tag_size() const override { return 16; }
+
+      ~SIV_Mode();
+
+   protected:
+      explicit SIV_Mode(BlockCipher* cipher);
+
+      size_t block_size() const { return m_bs; }
+
+      StreamCipher& ctr() { return *m_ctr; }
+
+      void set_ctr_iv(secure_vector<uint8_t> V);
+
+      secure_vector<uint8_t>& msg_buf() { return m_msg_buf; }
+
+      secure_vector<uint8_t> S2V(const uint8_t text[], size_t text_len);
+   private:
+      void start_msg(const uint8_t nonce[], size_t nonce_len) override;
+
+      void key_schedule(const uint8_t key[], size_t length) override;
+
+      const std::string m_name;
+      std::unique_ptr<StreamCipher> m_ctr;
+      std::unique_ptr<MessageAuthenticationCode> m_mac;
+      secure_vector<uint8_t> m_nonce, m_msg_buf;
+      std::vector<secure_vector<uint8_t>> m_ad_macs;
+      const size_t m_bs;
+   };
+
+/**
+* SIV Encryption
+*/
+class BOTAN_PUBLIC_API(2,0) SIV_Encryption final : public SIV_Mode
+   {
+   public:
+      /**
+      * @param cipher a block cipher
+      */
+      explicit SIV_Encryption(BlockCipher* cipher) : SIV_Mode(cipher) {}
+
+      void finish(secure_vector<uint8_t>& final_block, size_t offset = 0) override;
+
+      size_t output_length(size_t input_length) const override
+         { return input_length + tag_size(); }
+
+      size_t minimum_final_size() const override { return 0; }
+   };
+
+/**
+* SIV Decryption
+*/
+class BOTAN_PUBLIC_API(2,0) SIV_Decryption final : public SIV_Mode
+   {
+   public:
+      /**
+      * @param cipher a 128-bit block cipher
+      */
+      explicit SIV_Decryption(BlockCipher* cipher) : SIV_Mode(cipher) {}
+
+      void finish(secure_vector<uint8_t>& final_block, size_t offset = 0) override;
+
+      size_t output_length(size_t input_length) const override
+         {
+         BOTAN_ASSERT(input_length >= tag_size(), "Sufficient input");
+         return input_length - tag_size();
+         }
+
+      size_t minimum_final_size() const override { return tag_size(); }
+   };
+
+}
+
+#endif