Add Swift package definition (#2)

Asana task: https://app.asana.com/0/0/1204108473155669/f

.gitignore

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+.DS_Store
+/.build
+/Packages
+/*.xcodeproj
+xcuserdata/
+DerivedData/
+.swiftpm/config/registries.json
+.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
+.netrc

Package.swift

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+// swift-tools-version: 5.7
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "DDGSyncCrypto",
+    platforms: [
+        .iOS(.v14),
+        .macOS(.v10_15)
+    ],
+    products: [
+        .library(
+            name: "DDGSyncCrypto",
+            targets: ["DDGSyncCrypto"]
+        ),
+    ],
+    targets: [
+        .binaryTarget(
+            name: "Clibsodium",
+            path: "native_lib/third-party/apple/Clibsodium.xcframework"
+        ),
+        .target(
+            name: "DDGSyncCrypto",
+            dependencies: ["Clibsodium"],
+            path: "native_lib",
+            exclude: ["native_lib/third-party"],
+            publicHeadersPath: "."
+        )
+    ]
+)

native_lib/module.modulemap

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+module DDGSyncCrypto {
+    header "DDGSyncCrypto.h"
+    export *
+}

native_lib/third-party/apple/Clibsodium.xcframework/Info.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>AvailableLibraries</key>
+	<array>
+		<dict>
+			<key>HeadersPath</key>
+			<string>Headers</string>
+			<key>LibraryIdentifier</key>
+			<string>ios-arm64_armv7_armv7s</string>
+			<key>LibraryPath</key>
+			<string>libsodium.a</string>
+			<key>SupportedArchitectures</key>
+			<array>
+				<string>arm64</string>
+				<string>armv7</string>
+				<string>armv7s</string>
+			</array>
+			<key>SupportedPlatform</key>
+			<string>ios</string>
+		</dict>
+		<dict>
+			<key>HeadersPath</key>
+			<string>Headers</string>
+			<key>LibraryIdentifier</key>
+			<string>macos-arm64_x86_64</string>
+			<key>LibraryPath</key>
+			<string>libsodium.a</string>
+			<key>SupportedArchitectures</key>
+			<array>
+				<string>arm64</string>
+				<string>x86_64</string>
+			</array>
+			<key>SupportedPlatform</key>
+			<string>macos</string>
+		</dict>
+		<dict>
+			<key>HeadersPath</key>
+			<string>Headers</string>
+			<key>LibraryIdentifier</key>
+			<string>ios-arm64_i386_x86_64-simulator</string>
+			<key>LibraryPath</key>
+			<string>libsodium.a</string>
+			<key>SupportedArchitectures</key>
+			<array>
+				<string>arm64</string>
+				<string>i386</string>
+				<string>x86_64</string>
+			</array>
+			<key>SupportedPlatform</key>
+			<string>ios</string>
+			<key>SupportedPlatformVariant</key>
+			<string>simulator</string>
+		</dict>
+	</array>
+	<key>CFBundlePackageType</key>
+	<string>XFWK</string>
+	<key>XCFrameworkFormatVersion</key>
+	<string>1.0</string>
+</dict>
+</plist>

native_lib/third-party/apple/Clibsodium.xcframework/ios-arm64_armv7_armv7s/Headers/module.modulemap

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+module Clibsodium {
+    header "sodium.h"
+    export *
+}

native_lib/third-party/apple/Clibsodium.xcframework/ios-arm64_armv7_armv7s/Headers/sodium.h

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+
+#ifndef sodium_H
+#define sodium_H
+
+#include "sodium/version.h"
+
+#include "sodium/core.h"
+#include "sodium/crypto_aead_aes256gcm.h"
+#include "sodium/crypto_aead_chacha20poly1305.h"
+#include "sodium/crypto_aead_xchacha20poly1305.h"
+#include "sodium/crypto_auth.h"
+#include "sodium/crypto_auth_hmacsha256.h"
+#include "sodium/crypto_auth_hmacsha512.h"
+#include "sodium/crypto_auth_hmacsha512256.h"
+#include "sodium/crypto_box.h"
+#include "sodium/crypto_box_curve25519xsalsa20poly1305.h"
+#include "sodium/crypto_core_hsalsa20.h"
+#include "sodium/crypto_core_hchacha20.h"
+#include "sodium/crypto_core_salsa20.h"
+#include "sodium/crypto_core_salsa2012.h"
+#include "sodium/crypto_core_salsa208.h"
+#include "sodium/crypto_generichash.h"
+#include "sodium/crypto_generichash_blake2b.h"
+#include "sodium/crypto_hash.h"
+#include "sodium/crypto_hash_sha256.h"
+#include "sodium/crypto_hash_sha512.h"
+#include "sodium/crypto_kdf.h"
+#include "sodium/crypto_kdf_blake2b.h"
+#include "sodium/crypto_kx.h"
+#include "sodium/crypto_onetimeauth.h"
+#include "sodium/crypto_onetimeauth_poly1305.h"
+#include "sodium/crypto_pwhash.h"
+#include "sodium/crypto_pwhash_argon2i.h"
+#include "sodium/crypto_scalarmult.h"
+#include "sodium/crypto_scalarmult_curve25519.h"
+#include "sodium/crypto_secretbox.h"
+#include "sodium/crypto_secretbox_xsalsa20poly1305.h"
+#include "sodium/crypto_secretstream_xchacha20poly1305.h"
+#include "sodium/crypto_shorthash.h"
+#include "sodium/crypto_shorthash_siphash24.h"
+#include "sodium/crypto_sign.h"
+#include "sodium/crypto_sign_ed25519.h"
+#include "sodium/crypto_stream.h"
+#include "sodium/crypto_stream_chacha20.h"
+#include "sodium/crypto_stream_salsa20.h"
+#include "sodium/crypto_stream_xsalsa20.h"
+#include "sodium/crypto_verify_16.h"
+#include "sodium/crypto_verify_32.h"
+#include "sodium/crypto_verify_64.h"
+#include "sodium/randombytes.h"
+#include "sodium/randombytes_internal_random.h"
+#include "sodium/randombytes_sysrandom.h"
+#include "sodium/runtime.h"
+#include "sodium/utils.h"
+
+#ifndef SODIUM_LIBRARY_MINIMAL
+# include "sodium/crypto_box_curve25519xchacha20poly1305.h"
+# include "sodium/crypto_core_ed25519.h"
+# include "sodium/crypto_core_ristretto255.h"
+# include "sodium/crypto_scalarmult_ed25519.h"
+# include "sodium/crypto_scalarmult_ristretto255.h"
+# include "sodium/crypto_secretbox_xchacha20poly1305.h"
+# include "sodium/crypto_pwhash_scryptsalsa208sha256.h"
+# include "sodium/crypto_stream_salsa2012.h"
+# include "sodium/crypto_stream_salsa208.h"
+# include "sodium/crypto_stream_xchacha20.h"
+#endif
+
+#endif

native_lib/third-party/apple/Clibsodium.xcframework/ios-arm64_armv7_armv7s/Headers/sodium/core.h

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+
+#ifndef sodium_core_H
+#define sodium_core_H
+
+#include "export.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+SODIUM_EXPORT
+int sodium_init(void)
+            __attribute__ ((warn_unused_result));
+
+/* ---- */
+
+SODIUM_EXPORT
+int sodium_set_misuse_handler(void (*handler)(void));
+
+SODIUM_EXPORT
+void sodium_misuse(void)
+            __attribute__ ((noreturn));
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

native_lib/third-party/apple/Clibsodium.xcframework/ios-arm64_armv7_armv7s/Headers/sodium/crypto_aead_aes256gcm.h

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+#ifndef crypto_aead_aes256gcm_H
+#define crypto_aead_aes256gcm_H
+
+/*
+ * WARNING: Despite being the most popular AEAD construction due to its
+ * use in TLS, safely using AES-GCM in a different context is tricky.
+ *
+ * No more than ~ 350 GB of input data should be encrypted with a given key.
+ * This is for ~ 16 KB messages -- Actual figures vary according to
+ * message sizes.
+ *
+ * In addition, nonces are short and repeated nonces would totally destroy
+ * the security of this scheme.
+ *
+ * Nonces should thus come from atomic counters, which can be difficult to
+ * set up in a distributed environment.
+ *
+ * Unless you absolutely need AES-GCM, use crypto_aead_xchacha20poly1305_ietf_*()
+ * instead. It doesn't have any of these limitations.
+ * Or, if you don't need to authenticate additional data, just stick to
+ * crypto_secretbox().
+ */
+
+#include <stddef.h>
+#include "export.h"
+
+#ifdef __cplusplus
+# ifdef __GNUC__
+#  pragma GCC diagnostic ignored "-Wlong-long"
+# endif
+extern "C" {
+#endif
+
+SODIUM_EXPORT
+int crypto_aead_aes256gcm_is_available(void);
+
+#define crypto_aead_aes256gcm_KEYBYTES  32U
+SODIUM_EXPORT
+size_t crypto_aead_aes256gcm_keybytes(void);
+
+#define crypto_aead_aes256gcm_NSECBYTES 0U
+SODIUM_EXPORT
+size_t crypto_aead_aes256gcm_nsecbytes(void);
+
+#define crypto_aead_aes256gcm_NPUBBYTES 12U
+SODIUM_EXPORT
+size_t crypto_aead_aes256gcm_npubbytes(void);
+
+#define crypto_aead_aes256gcm_ABYTES    16U
+SODIUM_EXPORT
+size_t crypto_aead_aes256gcm_abytes(void);
+
+#define crypto_aead_aes256gcm_MESSAGEBYTES_MAX \
+    SODIUM_MIN(SODIUM_SIZE_MAX - crypto_aead_aes256gcm_ABYTES, \
+               (16ULL * ((1ULL << 32) - 2ULL)))
+SODIUM_EXPORT
+size_t crypto_aead_aes256gcm_messagebytes_max(void);
+
+typedef struct CRYPTO_ALIGN(16) crypto_aead_aes256gcm_state_ {
+    unsigned char opaque[512];
+} crypto_aead_aes256gcm_state;
+
+SODIUM_EXPORT
+size_t crypto_aead_aes256gcm_statebytes(void);
+
+SODIUM_EXPORT
+int crypto_aead_aes256gcm_encrypt(unsigned char *c,
+                                  unsigned long long *clen_p,
+                                  const unsigned char *m,
+                                  unsigned long long mlen,
+                                  const unsigned char *ad,
+                                  unsigned long long adlen,
+                                  const unsigned char *nsec,
+                                  const unsigned char *npub,
+                                  const unsigned char *k)
+            __attribute__ ((nonnull(1, 8, 9)));
+
+SODIUM_EXPORT
+int crypto_aead_aes256gcm_decrypt(unsigned char *m,
+                                  unsigned long long *mlen_p,
+                                  unsigned char *nsec,
+                                  const unsigned char *c,
+                                  unsigned long long clen,
+                                  const unsigned char *ad,
+                                  unsigned long long adlen,
+                                  const unsigned char *npub,
+                                  const unsigned char *k)
+            __attribute__ ((warn_unused_result)) __attribute__ ((nonnull(4, 8, 9)));
+
+SODIUM_EXPORT
+int crypto_aead_aes256gcm_encrypt_detached(unsigned char *c,
+                                           unsigned char *mac,
+                                           unsigned long long *maclen_p,
+                                           const unsigned char *m,
+                                           unsigned long long mlen,
+                                           const unsigned char *ad,
+                                           unsigned long long adlen,
+                                           const unsigned char *nsec,
+                                           const unsigned char *npub,
+                                           const unsigned char *k)
+            __attribute__ ((nonnull(1, 2, 9, 10)));
+
+SODIUM_EXPORT
+int crypto_aead_aes256gcm_decrypt_detached(unsigned char *m,
+                                           unsigned char *nsec,
+                                           const unsigned char *c,
+                                           unsigned long long clen,
+                                           const unsigned char *mac,
+                                           const unsigned char *ad,
+                                           unsigned long long adlen,
+                                           const unsigned char *npub,
+                                           const unsigned char *k)
+            __attribute__ ((warn_unused_result)) __attribute__ ((nonnull(3, 5, 8, 9)));
+
+/* -- Precomputation interface -- */
+
+SODIUM_EXPORT
+int crypto_aead_aes256gcm_beforenm(crypto_aead_aes256gcm_state *ctx_,
+                                   const unsigned char *k)
+            __attribute__ ((nonnull));
+
+SODIUM_EXPORT
+int crypto_aead_aes256gcm_encrypt_afternm(unsigned char *c,
+                                          unsigned long long *clen_p,
+                                          const unsigned char *m,
+                                          unsigned long long mlen,
+                                          const unsigned char *ad,
+                                          unsigned long long adlen,
+                                          const unsigned char *nsec,
+                                          const unsigned char *npub,
+                                          const crypto_aead_aes256gcm_state *ctx_)
+            __attribute__ ((nonnull(1, 8, 9)));
+
+SODIUM_EXPORT
+int crypto_aead_aes256gcm_decrypt_afternm(unsigned char *m,
+                                          unsigned long long *mlen_p,
+                                          unsigned char *nsec,
+                                          const unsigned char *c,
+                                          unsigned long long clen,
+                                          const unsigned char *ad,
+                                          unsigned long long adlen,
+                                          const unsigned char *npub,
+                                          const crypto_aead_aes256gcm_state *ctx_)
+            __attribute__ ((warn_unused_result)) __attribute__ ((nonnull(4, 8, 9)));
+
+SODIUM_EXPORT
+int crypto_aead_aes256gcm_encrypt_detached_afternm(unsigned char *c,
+                                                   unsigned char *mac,
+                                                   unsigned long long *maclen_p,
+                                                   const unsigned char *m,
+                                                   unsigned long long mlen,
+                                                   const unsigned char *ad,
+                                                   unsigned long long adlen,
+                                                   const unsigned char *nsec,
+                                                   const unsigned char *npub,
+                                                   const crypto_aead_aes256gcm_state *ctx_)
+            __attribute__ ((nonnull(1, 2, 9, 10)));
+
+SODIUM_EXPORT
+int crypto_aead_aes256gcm_decrypt_detached_afternm(unsigned char *m,
+                                                   unsigned char *nsec,
+                                                   const unsigned char *c,
+                                                   unsigned long long clen,
+                                                   const unsigned char *mac,
+                                                   const unsigned char *ad,
+                                                   unsigned long long adlen,
+                                                   const unsigned char *npub,
+                                                   const crypto_aead_aes256gcm_state *ctx_)
+            __attribute__ ((warn_unused_result)) __attribute__ ((nonnull(3, 5, 8, 9)));
+
+SODIUM_EXPORT
+void crypto_aead_aes256gcm_keygen(unsigned char k[crypto_aead_aes256gcm_KEYBYTES])
+            __attribute__ ((nonnull));
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif