Major refactoring: Split up "cryptfs" into several internal packages

"git status" for reference:

deleted:    cryptfs/cryptfs.go
deleted:    cryptfs/names_core.go
modified:   integration_tests/cli_test.go
modified:   integration_tests/helpers.go
renamed:    cryptfs/config_file.go -> internal/configfile/config_file.go
renamed:    cryptfs/config_test.go -> internal/configfile/config_test.go
renamed:    cryptfs/config_test/.gitignore -> internal/configfile/config_test/.gitignore
renamed:    cryptfs/config_test/PlaintextNames.conf -> internal/configfile/config_test/PlaintextNames.conf
renamed:    cryptfs/config_test/StrangeFeature.conf -> internal/configfile/config_test/StrangeFeature.conf
renamed:    cryptfs/config_test/v1.conf -> internal/configfile/config_test/v1.conf
renamed:    cryptfs/config_test/v2.conf -> internal/configfile/config_test/v2.conf
renamed:    cryptfs/kdf.go -> internal/configfile/kdf.go
renamed:    cryptfs/kdf_test.go -> internal/configfile/kdf_test.go
renamed:    cryptfs/cryptfs_content.go -> internal/contentenc/content.go
new file:   internal/contentenc/content_api.go
renamed:    cryptfs/content_test.go -> internal/contentenc/content_test.go
renamed:    cryptfs/file_header.go -> internal/contentenc/file_header.go
renamed:    cryptfs/intrablock.go -> internal/contentenc/intrablock.go
renamed:    cryptfs/address_translation.go -> internal/contentenc/offsets.go
new file:   internal/cryptocore/crypto_api.go
renamed:    cryptfs/gcm_go1.4.go -> internal/cryptocore/gcm_go1.4.go
renamed:    cryptfs/gcm_go1.5.go -> internal/cryptocore/gcm_go1.5.go
renamed:    cryptfs/nonce.go -> internal/cryptocore/nonce.go
renamed:    cryptfs/openssl_aead.go -> internal/cryptocore/openssl_aead.go
renamed:    cryptfs/openssl_benchmark.bash -> internal/cryptocore/openssl_benchmark.bash
renamed:    cryptfs/openssl_test.go -> internal/cryptocore/openssl_test.go
new file:   internal/nametransform/name_api.go
new file:   internal/nametransform/names_core.go
renamed:    cryptfs/names_diriv.go -> internal/nametransform/names_diriv.go
renamed:    cryptfs/names_noiv.go -> internal/nametransform/names_noiv.go
renamed:    cryptfs/names_test.go -> internal/nametransform/names_test.go
new file:   internal/nametransform/pad16.go
renamed:    cryptfs/log.go -> internal/toggledlog/log.go
renamed:    cryptfs/log_go1.4.go -> internal/toggledlog/log_go1.4.go
renamed:    cryptfs/log_go1.5.go -> internal/toggledlog/log_go1.5.go
modified:   main.go
modified:   masterkey.go
modified:   pathfs_frontend/file.go
modified:   pathfs_frontend/file_holes.go
modified:   pathfs_frontend/fs.go
modified:   pathfs_frontend/fs_dir.go
modified:   pathfs_frontend/names.go
modified:   test.bash

1 files changed, 75 insertions, 0 deletions

diff --git a/internal/cryptocore/openssl_test.go b/internal/cryptocore/openssl_test.go
new file mode 100644
index 0000000..94b696a
--- /dev/null
+++ b/internal/cryptocore/openssl_test.go
@@ -0,0 +1,75 @@
+package cryptocore
+
+// Benchmark go built-int GCM against spacemonkey openssl bindings
+//
+// Note: The benchmarks in this file supersede the ones in the openssl_benchmark
+//       directory as they use the same code paths that gocryptfs actually uses.
+//
+// Run benchmark:
+// go test -bench Enc
+
+import (
+	"crypto/aes"
+	"testing"
+)
+
+func benchmarkGoEnc(b *testing.B, plaintext []byte, key []byte, nonce []byte) (ciphertext []byte) {
+	b.SetBytes(int64(len(plaintext)))
+	aes, err := aes.NewCipher(key[:])
+	if err != nil {
+		b.Fatal(err)
+	}
+	aesgcm, err := goGCMWrapper(aes, len(nonce))
+	if err != nil {
+		b.Fatal(err)
+	}
+	// This would be fileID + blockNo
+	aData := make([]byte, 24)
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		// Encrypt plaintext and append to nonce
+		ciphertext = aesgcm.Seal(nonce, nonce, plaintext, aData)
+	}
+	return ciphertext
+}
+
+func benchmarkOpensslEnc(b *testing.B, plaintext []byte, key []byte, nonce []byte) (ciphertext []byte) {
+	b.SetBytes(int64(len(plaintext)))
+	var aesgcm opensslGCM
+	aesgcm.key = key
+	// This would be fileID + blockNo
+	aData := make([]byte, 24)
+	for i := 0; i < b.N; i++ {
+		// Encrypt plaintext and append to nonce
+		ciphertext = aesgcm.Seal(nonce, nonce, plaintext, aData)
+	}
+	return ciphertext
+}
+
+func BenchmarkEnc_Go_4k_AES256_nonce96(b *testing.B) {
+	plaintext := make([]byte, 4048)
+	key := make([]byte, 256/8)
+	nonce := make([]byte, 96/8)
+	benchmarkGoEnc(b, plaintext, key, nonce)
+}
+
+func BenchmarkEnc_Go_4k_AES256_nonce128(b *testing.B) {
+	plaintext := make([]byte, 4048)
+	key := make([]byte, 256/8)
+	nonce := make([]byte, 128/8)
+	benchmarkGoEnc(b, plaintext, key, nonce)
+}
+
+func BenchmarkEnc_OpenSSL_4k_AES256_nonce96(b *testing.B) {
+	plaintext := make([]byte, 4048)
+	key := make([]byte, 256/8)
+	nonce := make([]byte, 96/8)
+	benchmarkOpensslEnc(b, plaintext, key, nonce)
+}
+
+func BenchmarkEnc_OpenSSL_4k_AES256_nonce128(b *testing.B) {
+	plaintext := make([]byte, 4048)
+	key := make([]byte, 256/8)
+	nonce := make([]byte, 96/8)
+	benchmarkOpensslEnc(b, plaintext, key, nonce)
+}