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authorJakob Unterwurzacher2016-02-06 19:20:54 +0100
committerJakob Unterwurzacher2016-02-06 19:22:35 +0100
commit2b8cbd944149afe51fadddbd67ee4499d1d86250 (patch)
tree76361984cc4394bbb9b19ae987aeaff71fb6073b /internal/cryptocore/crypto_api.go
parentadcfbd79a8b8bb85cbee25996ab622a05de0dbc1 (diff)
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
Diffstat (limited to 'internal/cryptocore/crypto_api.go')
-rw-r--r--internal/cryptocore/crypto_api.go56
1 files changed, 56 insertions, 0 deletions
diff --git a/internal/cryptocore/crypto_api.go b/internal/cryptocore/crypto_api.go
new file mode 100644
index 0000000..c6b6869
--- /dev/null
+++ b/internal/cryptocore/crypto_api.go
@@ -0,0 +1,56 @@
+package cryptocore
+
+import (
+ "crypto/cipher"
+ "crypto/aes"
+ "fmt"
+)
+
+const (
+ KeyLen = 32 // AES-256
+ AuthTagLen = 16
+)
+
+type CryptoCore struct {
+ BlockCipher cipher.Block
+ Gcm cipher.AEAD
+ GcmIVGen *nonceGenerator
+ IVLen int
+}
+
+func New(key []byte, useOpenssl bool, GCMIV128 bool) *CryptoCore {
+
+ if len(key) != KeyLen {
+ panic(fmt.Sprintf("Unsupported key length %d", len(key)))
+ }
+
+ // We want the IV size in bytes
+ IVLen := 96 / 8
+ if GCMIV128 {
+ IVLen = 128 / 8
+ }
+
+ // We always use built-in Go crypto for blockCipher because it is not
+ // performance-critical.
+ blockCipher, err := aes.NewCipher(key)
+ if err != nil {
+ panic(err)
+ }
+
+ var gcm cipher.AEAD
+ if useOpenssl {
+ gcm = opensslGCM{key}
+ } else {
+ gcm, err = goGCMWrapper(blockCipher, IVLen)
+ if err != nil {
+ panic(err)
+ }
+ }
+
+ return &CryptoCore{
+ BlockCipher: blockCipher,
+ Gcm: gcm,
+ GcmIVGen: &nonceGenerator{nonceLen: IVLen},
+ IVLen: IVLen,
+ }
+}