92 lines
3.8 KiB
Vala
92 lines
3.8 KiB
Vala
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using GLib;
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namespace Crypto {
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public abstract class SymmetricCipherConverter : Converter, Object {
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internal SymmetricCipher cipher;
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internal size_t attached_taglen;
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public abstract ConverterResult convert(uint8[] inbuf, uint8[] outbuf, ConverterFlags flags, out size_t bytes_read, out size_t bytes_written) throws IOError;
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public uint8[] get_tag(size_t taglen) throws Error {
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return cipher.get_tag(taglen);
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}
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public void check_tag(uint8[] tag) throws Error {
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cipher.check_tag(tag);
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}
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public void reset() {
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cipher.reset();
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}
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}
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public class SymmetricCipherEncrypter : SymmetricCipherConverter {
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public SymmetricCipherEncrypter(owned SymmetricCipher cipher, size_t attached_taglen = 0) {
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this.cipher = (owned) cipher;
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this.attached_taglen = attached_taglen;
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}
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public override ConverterResult convert(uint8[] inbuf, uint8[] outbuf, ConverterFlags flags, out size_t bytes_read, out size_t bytes_written) throws IOError {
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if (inbuf.length > outbuf.length) {
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throw new IOError.NO_SPACE("CipherConverter needs at least the size of input as output space");
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}
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if ((flags & ConverterFlags.INPUT_AT_END) != 0 && inbuf.length + attached_taglen > outbuf.length) {
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throw new IOError.NO_SPACE("CipherConverter needs additional output space to attach tag");
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}
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if (inbuf.length > 0) {
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cipher.encrypt(outbuf, inbuf);
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}
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bytes_read = inbuf.length;
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bytes_written = inbuf.length;
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if ((flags & ConverterFlags.INPUT_AT_END) != 0) {
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if (attached_taglen > 0) {
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Memory.copy((uint8*)outbuf + inbuf.length, get_tag(attached_taglen), attached_taglen);
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bytes_written = inbuf.length + attached_taglen;
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}
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return ConverterResult.FINISHED;
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}
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if ((flags & ConverterFlags.FLUSH) != 0) {
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return ConverterResult.FLUSHED;
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}
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return ConverterResult.CONVERTED;
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}
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}
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public class SymmetricCipherDecrypter : SymmetricCipherConverter {
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public SymmetricCipherDecrypter(owned SymmetricCipher cipher, size_t attached_taglen = 0) {
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this.cipher = (owned) cipher;
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this.attached_taglen = attached_taglen;
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}
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public override ConverterResult convert(uint8[] inbuf, uint8[] outbuf, ConverterFlags flags, out size_t bytes_read, out size_t bytes_written) throws IOError {
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if (inbuf.length > outbuf.length + attached_taglen) {
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throw new IOError.NO_SPACE("CipherConverter needs at least the size of input as output space");
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}
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if ((flags & ConverterFlags.INPUT_AT_END) != 0 && inbuf.length < attached_taglen) {
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throw new IOError.PARTIAL_INPUT("CipherConverter needs additional input to read tag");
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} else if ((flags & ConverterFlags.INPUT_AT_END) == 0 && inbuf.length < attached_taglen + 1) {
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throw new IOError.PARTIAL_INPUT("CipherConverter needs additional input to make sure to not accidentally read tag");
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}
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inbuf.length -= (int) attached_taglen;
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if (inbuf.length > 0) {
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cipher.decrypt(outbuf, inbuf);
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}
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bytes_read = inbuf.length;
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bytes_written = inbuf.length;
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inbuf.length += (int) attached_taglen;
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if ((flags & ConverterFlags.INPUT_AT_END) != 0) {
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if (attached_taglen > 0) {
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print("Checking tag\n");
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check_tag(inbuf[(inbuf.length - attached_taglen):inbuf.length]);
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print("tag ok\n");
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bytes_read = inbuf.length;
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}
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return ConverterResult.FINISHED;
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}
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if ((flags & ConverterFlags.FLUSH) != 0) {
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return ConverterResult.FLUSHED;
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}
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return ConverterResult.CONVERTED;
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}
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}
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}
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