seraphis_crypto: remove unused transcript utility

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 2bcc653..85116ae 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -94,7 +94,6 @@ add_subdirectory(hardforks)
 add_subdirectory(blockchain_db)
 add_subdirectory(mnemonics)
 add_subdirectory(rpc)
-add_subdirectory(seraphis_crypto)
 if(NOT IOS)
   add_subdirectory(serialization)
 endif()
diff --git a/src/seraphis_crypto/CMakeLists.txt b/src/seraphis_crypto/CMakeLists.txt
deleted file mode 100644
index 19b6ad7..0000000
--- a/src/seraphis_crypto/CMakeLists.txt
+++ /dev/null
@@ -1,51 +0,0 @@
-# Copyright (c) 2021-2024, The Monero Project
-#
-# 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.
-#
-# 3. Neither the name of the copyright holder nor the names of its contributors may be
-#    used to endorse or promote products derived from this software without specific
-#    prior written permission.
-#
-# 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.
-
-set(seraphis_crypto_sources
-  dummy.cpp)
-
-monero_find_all_headers(seraphis_crypto_headers, "${CMAKE_CURRENT_SOURCE_DIR}")
-
-monero_add_library(seraphis_crypto
-  ${seraphis_crypto_sources}
-  ${seraphis_crypto_headers})
-
-target_link_libraries(seraphis_crypto
-  PUBLIC
-    cncrypto
-    common
-    epee
-    ringct
-  PRIVATE
-    ${EXTRA_LIBRARIES})
-
-target_include_directories(seraphis_crypto
-  PUBLIC
-    "${CMAKE_CURRENT_SOURCE_DIR}"
-  PRIVATE
-    ${Boost_INCLUDE_DIRS})
diff --git a/src/seraphis_crypto/dummy.cpp b/src/seraphis_crypto/dummy.cpp
deleted file mode 100644
index e69de29..0000000
diff --git a/src/seraphis_crypto/sp_transcript.h b/src/seraphis_crypto/sp_transcript.h
deleted file mode 100644
index bb99b56..0000000
--- a/src/seraphis_crypto/sp_transcript.h
+++ /dev/null
@@ -1,397 +0,0 @@
-// Copyright (c) 2022-2024, The Monero Project
-// 
-// 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.
-// 
-// 3. Neither the name of the copyright holder nor the names of its contributors may be
-//    used to endorse or promote products derived from this software without specific
-//    prior written permission.
-// 
-// 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.
-
-// Transcript class for assembling data that needs to be hashed.
-
-#pragma once
-
-//local headers
-#include "crypto/crypto.h"
-#include "cryptonote_config.h"
-#include "ringct/rctTypes.h"
-#include "wipeable_string.h"
-
-//third party headers
-#include <boost/utility/string_ref.hpp>
-
-//standard headers
-#include <list>
-#include <string>
-#include <type_traits>
-#include <vector>
-
-//forward declarations
-
-
-namespace sp
-{
-
-////
-// SpTranscriptBuilder
-// - build a transcript
-// - the user must provide a label when trying to append something to the transcript; labels are prepended to objects in
-//   the transcript
-// - data types
-//     - unsigned int: uint_flag || varint(uint_variable)
-//     - signed int: int_flag || uchar{int_variable < 0 ? 1 : 0} || varint(abs(int_variable))
-//     - byte buffer (assumed little-endian): buffer_flag || buffer_length || buffer
-//       - all labels are treated as byte buffers
-//     - named container: container_flag || container_name || data_member1 || ... || container_terminator_flag
-//     - list-type container (same-type elements only): list_flag || list_length || element1 || element2 || ...
-// - the transcript can be used like a string via the .data() and .size() member functions
-// - simple mode: exclude all labels, flags, and lengths
-///
-class SpTranscriptBuilder final
-{
-public:
-//public member types
-    /// transcript builder mode
-    enum class Mode
-    {
-        FULL,
-        SIMPLE
-    };
-
-//constructors
-    /// normal constructor
-    SpTranscriptBuilder(const std::size_t estimated_data_size, const Mode mode) :
-        m_mode{mode}
-    {
-        m_transcript.reserve(2 * estimated_data_size + 20);
-    }
-
-//overloaded operators
-    /// disable copy/move (this is a scoped manager [of the 'transcript' concept])
-    SpTranscriptBuilder& operator=(SpTranscriptBuilder&&) = delete;
-
-//member functions
-    /// append a value to the transcript
-    template <typename T>
-    void append(const boost::string_ref label, const T &value)
-    {
-        this->append_impl(label, value);
-    }
-
-    /// access the transcript data
-    const void* data() const { return m_transcript.data(); }
-    std::size_t size() const { return m_transcript.size(); }
-
-private:
-//member variables
-    /// in simple mode, exclude labels, flags, and lengths
-    Mode m_mode;
-    /// the transcript buffer (wipeable in case it contains sensitive data)
-    epee::wipeable_string m_transcript;
-
-//private member types
-    /// flags for separating items added to the transcript
-    enum SpTranscriptBuilderFlag : unsigned char
-    {
-        UNSIGNED_INTEGER = 0,
-        SIGNED_INTEGER = 1,
-        BYTE_BUFFER = 2,
-        NAMED_CONTAINER = 3,
-        NAMED_CONTAINER_TERMINATOR = 4,
-        LIST_TYPE_CONTAINER = 5
-    };
-
-//transcript builders
-    void append_character(const unsigned char character)
-    {
-        m_transcript += static_cast<char>(character);
-    }
-    void append_uint(const std::uint64_t unsigned_integer)
-    {
-        unsigned char v_variable[(sizeof(std::uint64_t) * 8 + 6) / 7];
-        unsigned char *v_variable_end = v_variable;
-
-        // append uint to string as a varint
-        tools::write_varint(v_variable_end, unsigned_integer);
-        assert(v_variable_end <= v_variable + sizeof(v_variable));
-        m_transcript.append(reinterpret_cast<const char*>(v_variable), v_variable_end - v_variable);
-    }
-    void append_flag(const SpTranscriptBuilderFlag flag)
-    {
-        if (m_mode == Mode::SIMPLE)
-            return;
-
-        static_assert(sizeof(SpTranscriptBuilderFlag) == sizeof(unsigned char), "");
-        this->append_character(static_cast<unsigned char>(flag));
-    }
-    void append_length(const std::size_t length)
-    {
-        if (m_mode == Mode::SIMPLE)
-            return;
-
-        static_assert(sizeof(std::size_t) <= sizeof(std::uint64_t), "");
-        this->append_uint(static_cast<std::uint64_t>(length));
-    }
-    void append_buffer(const void *data, const std::size_t length)
-    {
-        this->append_flag(SpTranscriptBuilderFlag::BYTE_BUFFER);
-        this->append_length(length);
-        m_transcript.append(reinterpret_cast<const char*>(data), length);
-    }
-    void append_label(const boost::string_ref label)
-    {
-        if (m_mode == Mode::SIMPLE ||
-            label.size() == 0)
-            return;
-
-        this->append_buffer(label.data(), label.size());
-    }
-    void append_labeled_buffer(const boost::string_ref label, const void *data, const std::size_t length)
-    {
-        this->append_label(label);
-        this->append_buffer(data, length);
-    }
-    void begin_named_container(const boost::string_ref container_name)
-    {
-        this->append_flag(SpTranscriptBuilderFlag::NAMED_CONTAINER);
-        this->append_label(container_name);
-    }
-    void end_named_container()
-    {
-        this->append_flag(SpTranscriptBuilderFlag::NAMED_CONTAINER_TERMINATOR);
-    }
-    void begin_list_type_container(const std::size_t list_length)
-    {
-        this->append_flag(SpTranscriptBuilderFlag::LIST_TYPE_CONTAINER);
-        this->append_length(list_length);
-    }
-
-//append overloads
-    void append_impl(const boost::string_ref label, const rct::key &key_buffer)
-    {
-        this->append_labeled_buffer(label, key_buffer.bytes, sizeof(key_buffer));
-    }
-    void append_impl(const boost::string_ref label, const rct::ctkey &ctkey)
-    {
-        this->append_label(label);
-        this->append_impl("ctmask", ctkey.mask);
-        this->append_impl("ctdest", ctkey.dest);
-    }
-    void append_impl(const boost::string_ref label, const crypto::secret_key &point_buffer)
-    {
-        this->append_labeled_buffer(label, point_buffer.data, sizeof(point_buffer));
-    }
-    void append_impl(const boost::string_ref label, const crypto::public_key &scalar_buffer)
-    {
-        this->append_labeled_buffer(label, scalar_buffer.data, sizeof(scalar_buffer));
-    }
-    void append_impl(const boost::string_ref label, const crypto::key_derivation &derivation_buffer)
-    {
-        this->append_labeled_buffer(label, derivation_buffer.data, sizeof(derivation_buffer));
-    }
-    void append_impl(const boost::string_ref label, const crypto::key_image &key_image_buffer)
-    {
-        this->append_labeled_buffer(label, key_image_buffer.data, sizeof(key_image_buffer));
-    }
-    void append_impl(const boost::string_ref label, const std::string &string_buffer)
-    {
-        this->append_labeled_buffer(label, string_buffer.data(), string_buffer.size());
-    }
-    void append_impl(const boost::string_ref label, const epee::wipeable_string &string_buffer)
-    {
-        this->append_labeled_buffer(label, string_buffer.data(), string_buffer.size());
-    }
-    void append_impl(const boost::string_ref label, const boost::string_ref string_buffer)
-    {
-        this->append_labeled_buffer(label, string_buffer.data(), string_buffer.size());
-    }
-    template<std::size_t Sz>
-    void append_impl(const boost::string_ref label, const unsigned char(&uchar_buffer)[Sz])
-    {
-        this->append_labeled_buffer(label, uchar_buffer, Sz);
-    }
-    template<std::size_t Sz>
-    void append_impl(const boost::string_ref label, const char(&char_buffer)[Sz])
-    {
-        this->append_labeled_buffer(label, char_buffer, Sz);
-    }
-    void append_impl(const boost::string_ref label, const std::vector<unsigned char> &vector_buffer)
-    {
-        this->append_labeled_buffer(label, vector_buffer.data(), vector_buffer.size());
-    }
-    void append_impl(const boost::string_ref label, const std::vector<char> &vector_buffer)
-    {
-        this->append_labeled_buffer(label, vector_buffer.data(), vector_buffer.size());
-    }
-    void append_impl(const boost::string_ref label, const char single_character)
-    {
-        this->append_label(label);
-        this->append_character(static_cast<unsigned char>(single_character));
-    }
-    void append_impl(const boost::string_ref label, const unsigned char single_character)
-    {
-        this->append_label(label);
-        this->append_character(single_character);
-    }
-    template<typename T,
-        std::enable_if_t<std::is_unsigned<T>::value, bool> = true>
-    void append_impl(const boost::string_ref label, const T unsigned_integer)
-    {
-        static_assert(sizeof(T) <= sizeof(std::uint64_t), "SpTranscriptBuilder: unsupported unsigned integer type.");
-        this->append_label(label);
-        this->append_flag(SpTranscriptBuilderFlag::UNSIGNED_INTEGER);
-        this->append_uint(unsigned_integer);
-    }
-    template<typename T,
-        std::enable_if_t<std::is_integral<T>::value, bool> = true,
-        std::enable_if_t<!std::is_unsigned<T>::value, bool> = true>
-    void append_impl(const boost::string_ref label, const T signed_integer)
-    {
-        using unsigned_type = std::make_unsigned<T>::type;
-        static_assert(sizeof(unsigned_type) <= sizeof(std::uint64_t),
-            "SpTranscriptBuilder: unsupported signed integer type.");
-        this->append_label(label);
-        this->append_flag(SpTranscriptBuilderFlag::SIGNED_INTEGER);
-        this->append_uint(static_cast<std::uint64_t>(static_cast<unsigned_type>(signed_integer)));
-    }
-    template<typename T,
-        std::enable_if_t<!std::is_integral<T>::value, bool> = true>
-    void append_impl(const boost::string_ref label, const T &named_container)
-    {
-        // named containers must satisfy two concepts:
-        //   const boost::string_ref container_name(const T &container);
-        //   void append_to_transcript(const T &container, SpTranscriptBuilder &transcript_inout);
-        //todo: container_name() and append_to_transcript() must be defined in the sp namespace, but that is not generic
-        this->append_label(label);
-        this->begin_named_container(container_name(named_container));
-        append_to_transcript(named_container, *this);  //non-member function assumed to be implemented elsewhere
-        this->end_named_container();
-    }
-    template<typename T>
-    void append_impl(const boost::string_ref label, const std::vector<T> &list_container)
-    {
-        this->append_label(label);
-        this->begin_list_type_container(list_container.size());
-        for (const T &element : list_container)
-            this->append_impl("", element);
-    }
-    template<typename T>
-    void append_impl(const boost::string_ref label, const std::list<T> &list_container)
-    {
-        this->append_label(label);
-        this->begin_list_type_container(list_container.size());
-        for (const T &element : list_container)
-            this->append_impl("", element);
-    }
-};
-
-////
-// SpFSTranscript
-// - build a Fiat-Shamir transcript
-// - main format: prefix || domain_separator || object1_label || object1 || object2_label || object2 || ...
-// note: prefix defaults to "monero"
-///
-class SpFSTranscript final
-{
-public:
-//constructors
-    /// normal constructor: start building a transcript with the domain separator
-    SpFSTranscript(const boost::string_ref domain_separator,
-        const std::size_t estimated_data_size,
-        const boost::string_ref prefix = config::TRANSCRIPT_PREFIX) :
-        m_transcript_builder{15 + domain_separator.size() + estimated_data_size + prefix.size(),
-            SpTranscriptBuilder::Mode::FULL}
-    {
-        // transcript = prefix || domain_separator
-        m_transcript_builder.append("FSp", prefix);
-        m_transcript_builder.append("ds", domain_separator);
-    }
-
-//overloaded operators
-    /// disable copy/move (this is a scoped manager [of the 'transcript' concept])
-    SpFSTranscript& operator=(SpFSTranscript&&) = delete;
-
-//member functions
-    /// build the transcript
-    template<typename T>
-    void append(const boost::string_ref label, const T &value)
-    {
-        m_transcript_builder.append(label, value);
-    }
-
-    /// access the transcript data
-    const void* data() const { return m_transcript_builder.data(); }
-    std::size_t size() const { return m_transcript_builder.size(); }
-
-//member variables
-private:
-    /// underlying transcript builder
-    SpTranscriptBuilder m_transcript_builder;
-};
-
-////
-// SpKDFTranscript
-// - build a data string for a key-derivation function
-// - mainly intended for short transcripts (~128 bytes or less) with fixed-length and statically ordered components
-// - main format: prefix || domain_separator || object1 || object2 || ...
-// - simple transcript mode: no labels, flags, or lengths
-// note: prefix defaults to "monero"
-///
-class SpKDFTranscript final
-{
-public:
-//constructors
-    /// normal constructor: start building a transcript with the domain separator
-    SpKDFTranscript(const boost::string_ref domain_separator,
-        const std::size_t estimated_data_size,
-        const boost::string_ref prefix = config::TRANSCRIPT_PREFIX) :
-        m_transcript_builder{10 + domain_separator.size() + estimated_data_size + prefix.size(),
-            SpTranscriptBuilder::Mode::SIMPLE}
-    {
-        // transcript = prefix || domain_separator
-        m_transcript_builder.append("", prefix);
-        m_transcript_builder.append("", domain_separator);
-    }
-
-//overloaded operators
-    /// disable copy/move (this is a scoped manager [of the 'transcript' concept])
-    SpKDFTranscript& operator=(SpKDFTranscript&&) = delete;
-
-//member functions
-    /// build the transcript
-    template<typename T>
-    void append(const boost::string_ref, const T &value)
-    {
-        m_transcript_builder.append("", value);
-    }
-
-    /// access the transcript data
-    const void* data() const { return m_transcript_builder.data(); }
-    std::size_t size() const { return m_transcript_builder.size(); }
-
-//member variables
-private:
-    /// underlying transcript builder
-    SpTranscriptBuilder m_transcript_builder;
-};
-
-} //namespace sp
diff --git a/tests/performance_tests/CMakeLists.txt b/tests/performance_tests/CMakeLists.txt
index a1158fc..4c32e5e 100644
--- a/tests/performance_tests/CMakeLists.txt
+++ b/tests/performance_tests/CMakeLists.txt
@@ -67,7 +67,6 @@ target_link_libraries(performance_tests
     common
     cncrypto
     epee
-    seraphis_crypto
     ${Boost_CHRONO_LIBRARY}
     ${CMAKE_THREAD_LIBS_INIT}
     ${EXTRA_LIBRARIES})
diff --git a/tests/unit_tests/CMakeLists.txt b/tests/unit_tests/CMakeLists.txt
index ed53a54..dc30a24 100644
--- a/tests/unit_tests/CMakeLists.txt
+++ b/tests/unit_tests/CMakeLists.txt
@@ -125,7 +125,6 @@ target_link_libraries(unit_tests
     rpc
     net
     serialization
-    seraphis_crypto
     wallet
     p2p
     version