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authorMarvin W <git@larma.de>2019-09-10 20:55:24 +0200
committerMarvin W <git@larma.de>2019-09-16 23:31:11 +0200
commit87d64524c8e4397515be045901427e71b660134f (patch)
tree491a80731746c5b85d889901b4e37469feeb952d /plugins/crypto-vala/src/cipher_converter.vala
parent784319a9c162896dbaaf3beb4a9f8ba777b149ff (diff)
downloaddino-87d64524c8e4397515be045901427e71b660134f.tar.gz
dino-87d64524c8e4397515be045901427e71b660134f.zip
Add basic crypto-vala
Diffstat (limited to 'plugins/crypto-vala/src/cipher_converter.vala')
-rw-r--r--plugins/crypto-vala/src/cipher_converter.vala92
1 files changed, 92 insertions, 0 deletions
diff --git a/plugins/crypto-vala/src/cipher_converter.vala b/plugins/crypto-vala/src/cipher_converter.vala
new file mode 100644
index 00000000..72e11dcd
--- /dev/null
+++ b/plugins/crypto-vala/src/cipher_converter.vala
@@ -0,0 +1,92 @@
+using GLib;
+
+namespace Crypto {
+public abstract class SymmetricCipherConverter : Converter, Object {
+ internal SymmetricCipher cipher;
+ internal size_t attached_taglen;
+
+ public abstract ConverterResult convert(uint8[] inbuf, uint8[] outbuf, ConverterFlags flags, out size_t bytes_read, out size_t bytes_written) throws IOError;
+
+ public uint8[] get_tag(size_t taglen) throws Error {
+ return cipher.get_tag(taglen);
+ }
+
+ public void check_tag(uint8[] tag) throws Error {
+ cipher.check_tag(tag);
+ }
+
+ public void reset() {
+ cipher.reset();
+ }
+}
+
+public class SymmetricCipherEncrypter : SymmetricCipherConverter {
+ public SymmetricCipherEncrypter(owned SymmetricCipher cipher, size_t attached_taglen = 0) {
+ this.cipher = (owned) cipher;
+ this.attached_taglen = attached_taglen;
+ }
+
+ public override ConverterResult convert(uint8[] inbuf, uint8[] outbuf, ConverterFlags flags, out size_t bytes_read, out size_t bytes_written) throws IOError {
+ if (inbuf.length > outbuf.length) {
+ throw new IOError.NO_SPACE("CipherConverter needs at least the size of input as output space");
+ }
+ if ((flags & ConverterFlags.INPUT_AT_END) != 0 && inbuf.length + attached_taglen > outbuf.length) {
+ throw new IOError.NO_SPACE("CipherConverter needs additional output space to attach tag");
+ }
+ if (inbuf.length > 0) {
+ cipher.encrypt(outbuf, inbuf);
+ }
+ bytes_read = inbuf.length;
+ bytes_written = inbuf.length;
+ if ((flags & ConverterFlags.INPUT_AT_END) != 0) {
+ if (attached_taglen > 0) {
+ Memory.copy((uint8*)outbuf + inbuf.length, get_tag(attached_taglen), attached_taglen);
+ bytes_written = inbuf.length + attached_taglen;
+ }
+ return ConverterResult.FINISHED;
+ }
+ if ((flags & ConverterFlags.FLUSH) != 0) {
+ return ConverterResult.FLUSHED;
+ }
+ return ConverterResult.CONVERTED;
+ }
+}
+
+public class SymmetricCipherDecrypter : SymmetricCipherConverter {
+ public SymmetricCipherDecrypter(owned SymmetricCipher cipher, size_t attached_taglen = 0) {
+ this.cipher = (owned) cipher;
+ this.attached_taglen = attached_taglen;
+ }
+
+ public override ConverterResult convert(uint8[] inbuf, uint8[] outbuf, ConverterFlags flags, out size_t bytes_read, out size_t bytes_written) throws IOError {
+ if (inbuf.length > outbuf.length + attached_taglen) {
+ throw new IOError.NO_SPACE("CipherConverter needs at least the size of input as output space");
+ }
+ if ((flags & ConverterFlags.INPUT_AT_END) != 0 && inbuf.length < attached_taglen) {
+ throw new IOError.PARTIAL_INPUT("CipherConverter needs additional input to read tag");
+ } else if ((flags & ConverterFlags.INPUT_AT_END) == 0 && inbuf.length < attached_taglen + 1) {
+ throw new IOError.PARTIAL_INPUT("CipherConverter needs additional input to make sure to not accidentally read tag");
+ }
+ inbuf.length -= (int) attached_taglen;
+ if (inbuf.length > 0) {
+ cipher.decrypt(outbuf, inbuf);
+ }
+ bytes_read = inbuf.length;
+ bytes_written = inbuf.length;
+ inbuf.length += (int) attached_taglen;
+ if ((flags & ConverterFlags.INPUT_AT_END) != 0) {
+ if (attached_taglen > 0) {
+ print("Checking tag\n");
+ check_tag(inbuf[(inbuf.length - attached_taglen):inbuf.length]);
+ print("tag ok\n");
+ bytes_read = inbuf.length;
+ }
+ return ConverterResult.FINISHED;
+ }
+ if ((flags & ConverterFlags.FLUSH) != 0) {
+ return ConverterResult.FLUSHED;
+ }
+ return ConverterResult.CONVERTED;
+ }
+}
+} \ No newline at end of file