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namespace Crypto {
public class SymmetricCipher {
private GCrypt.Cipher.Cipher cipher;
public static bool supports(string algo_name) {
GCrypt.Cipher.Algorithm algo;
GCrypt.Cipher.Mode mode;
GCrypt.Cipher.Flag flags;
return parse(algo_name, out algo, out mode, out flags);
}
private static unowned string mode_to_string(GCrypt.Cipher.Mode mode) {
switch (mode) {
case GCrypt.Cipher.Mode.ECB: return "ECB";
case GCrypt.Cipher.Mode.CFB: return "CFB";
case GCrypt.Cipher.Mode.CBC: return "CBC";
case GCrypt.Cipher.Mode.STREAM: return "STREAM";
case GCrypt.Cipher.Mode.OFB: return "OFB";
case GCrypt.Cipher.Mode.CTR: return "CTR";
case GCrypt.Cipher.Mode.AESWRAP: return "AESWRAP";
case GCrypt.Cipher.Mode.GCM: return "GCM";
case GCrypt.Cipher.Mode.POLY1305: return "POLY1305";
case GCrypt.Cipher.Mode.OCB: return "OCB";
case GCrypt.Cipher.Mode.CFB8: return "CFB8";
// case GCrypt.Cipher.Mode.XTS: return "XTS"; // Not supported in gcrypt < 1.8
}
return "NONE";
}
private static GCrypt.Cipher.Mode mode_from_string(string name) {
switch (name) {
case "ECB": return GCrypt.Cipher.Mode.ECB;
case "CFB": return GCrypt.Cipher.Mode.CFB;
case "CBC": return GCrypt.Cipher.Mode.CBC;
case "STREAM": return GCrypt.Cipher.Mode.STREAM;
case "OFB": return GCrypt.Cipher.Mode.OFB;
case "CTR": return GCrypt.Cipher.Mode.CTR;
case "AESWRAP": return GCrypt.Cipher.Mode.AESWRAP;
case "GCM": return GCrypt.Cipher.Mode.GCM;
case "POLY1305": return GCrypt.Cipher.Mode.POLY1305;
case "OCB": return GCrypt.Cipher.Mode.OCB;
case "CFB8": return GCrypt.Cipher.Mode.CFB8;
// case "XTS": return GCrypt.Cipher.Mode.XTS; // Not supported in gcrypt < 1.8
}
return GCrypt.Cipher.Mode.NONE;
}
private static string flags_to_string(GCrypt.Cipher.Flag flags) {
string? s = null;
if ((GCrypt.Cipher.Flag.CBC_MAC & flags) != 0) s = (s == null ? "" : @"$s-") + "MAC";
if ((GCrypt.Cipher.Flag.CBC_CTS & flags) != 0) s = (s == null ? "" : @"$s-") + "CTS";
if ((GCrypt.Cipher.Flag.ENABLE_SYNC & flags) != 0) s = (s == null ? "" : @"$s-") + "SYNC";
if ((GCrypt.Cipher.Flag.SECURE & flags) != 0) s = (s == null ? "" : @"$s-") + "SECURE";
return s ?? "NONE";
}
private static GCrypt.Cipher.Flag flag_from_string(string flag_name) {
if (flag_name == "SECURE") return GCrypt.Cipher.Flag.SECURE;
if (flag_name == "SYNC") return GCrypt.Cipher.Flag.ENABLE_SYNC;
if (flag_name == "CTS") return GCrypt.Cipher.Flag.CBC_CTS;
if (flag_name == "MAC") return GCrypt.Cipher.Flag.CBC_MAC;
return 0;
}
private static GCrypt.Cipher.Flag flags_from_string(string flag_names) {
GCrypt.Cipher.Flag flags = 0;
foreach(string flag in flag_names.split("-")) {
flags |= flag_from_string(flag);
}
return flags;
}
private static bool parse(string algo_name, out GCrypt.Cipher.Algorithm algo, out GCrypt.Cipher.Mode mode, out GCrypt.Cipher.Flag flags) {
algo = GCrypt.Cipher.Algorithm.NONE;
mode = GCrypt.Cipher.Mode.NONE;
flags = 0;
string[] algo_parts = algo_name.split("-", 3);
algo = GCrypt.Cipher.Algorithm.from_string(algo_parts[0]);
if (algo_parts.length >= 2) {
mode = mode_from_string(algo_parts[1]);
}
if (algo_parts.length == 3) {
flags |= flags_from_string(algo_parts[2]);
}
return to_algo_name(algo, mode, flags) == algo_name;
}
private static string to_algo_name(GCrypt.Cipher.Algorithm algo = GCrypt.Cipher.Algorithm.NONE, GCrypt.Cipher.Mode mode = GCrypt.Cipher.Mode.NONE, GCrypt.Cipher.Flag flags = 0) {
if (flags != 0) {
return @"$algo-$(mode_to_string(mode))-$(flags_to_string(flags))";
} else if (mode != GCrypt.Cipher.Mode.NONE) {
return @"$algo-$(mode_to_string(mode))";
} else {
return algo.to_string();
}
}
public SymmetricCipher(string algo_name) throws Error {
GCrypt.Cipher.Algorithm algo;
GCrypt.Cipher.Mode mode;
GCrypt.Cipher.Flag flags;
if (parse(algo_name, out algo, out mode, out flags)) {
this.gcrypt(algo, mode, flags);
} else {
throw new Error.ILLEGAL_ARGUMENTS(@"The algorithm $algo_name is not supported");
}
}
private SymmetricCipher.gcrypt(GCrypt.Cipher.Algorithm algo, GCrypt.Cipher.Mode mode, GCrypt.Cipher.Flag flags) throws Error {
may_throw_gcrypt_error(GCrypt.Cipher.Cipher.open(out this.cipher, algo, mode, flags));
}
public void set_key(uint8[] key) throws Error {
may_throw_gcrypt_error(cipher.set_key(key));
}
public void set_iv(uint8[] iv) throws Error {
may_throw_gcrypt_error(cipher.set_iv(iv));
}
public void set_counter_vector(uint8[] ctr) throws Error {
may_throw_gcrypt_error(cipher.set_counter_vector(ctr));
}
public void reset() throws Error {
may_throw_gcrypt_error(cipher.reset());
}
public uint8[] get_tag(size_t taglen) throws Error {
uint8[] tag = new uint8[taglen];
may_throw_gcrypt_error(cipher.get_tag(tag));
return tag;
}
public void check_tag(uint8[] tag) throws Error {
may_throw_gcrypt_error(cipher.check_tag(tag));
}
public void encrypt(uint8[] output, uint8[] input) throws Error {
may_throw_gcrypt_error(cipher.encrypt(output, input));
}
public void decrypt(uint8[] output, uint8[] input) throws Error {
may_throw_gcrypt_error(cipher.decrypt(output, input));
}
public void sync() throws Error {
may_throw_gcrypt_error(cipher.sync());
}
}
}
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