1 files changed, 0 insertions, 92 deletions
diff --git a/test-rig/Keygen.java b/test-rig/Keygen.java
deleted file mode 100644
index 8cb90a6..0000000
--- a/test-rig/Keygen.java
+++ /dev/null
@@ -1,92 +0,0 @@
-// Read a DER-encoded PKCS#8 RSA private key, derive the public key,
-// emit the Android adb_keys line on stdout.
-//
-//   java test-rig/Keygen.java <path/to/adbkey.der>
-//
-// The Android pubkey blob format (from system/core/libcrypto_utils):
-//   uint32_t modulus_size_words;   // = 64 for RSA-2048
-//   uint32_t n0inv;                // -1 / N[0] mod 2^32
-//   uint8_t  modulus[256];         // little-endian
-//   uint8_t  rr[256];              // (2^2048)^2 mod N, little-endian
-//   uint32_t exponent;             // typically 65537
-// = 524 bytes, then base64-encoded, then " scrcpy-android@test".
-
-import java.io.IOException;
-import java.math.BigInteger;
-import java.nio.ByteBuffer;
-import java.nio.ByteOrder;
-import java.nio.file.Files;
-import java.nio.file.Path;
-import java.security.KeyFactory;
-import java.security.PrivateKey;
-import java.security.interfaces.RSAPrivateCrtKey;
-import java.security.interfaces.RSAPublicKey;
-import java.security.spec.PKCS8EncodedKeySpec;
-import java.security.spec.RSAPublicKeySpec;
-import java.util.Base64;
-
-public final class Keygen {
-
-    private static final int MODULUS_SIZE       = 256;             // bytes (2048 / 8)
-    private static final int MODULUS_SIZE_WORDS = MODULUS_SIZE / 4;
-    private static final int ENCODED_SIZE       = 3 * 4 + 2 * MODULUS_SIZE;
-
-    public static void main(String[] args) throws Exception {
-        if (args.length != 1) {
-            System.err.println("usage: java Keygen.java <der private key path>");
-            System.exit(2);
-        }
-        byte[] der = Files.readAllBytes(Path.of(args[0]));
-        PrivateKey priv = KeyFactory.getInstance("RSA")
-                .generatePrivate(new PKCS8EncodedKeySpec(der));
-        RSAPublicKey pub = derivePublic(priv);
-
-        byte[] blob = encode(pub);
-        String b64 = Base64.getEncoder().encodeToString(blob);
-        System.out.print(b64);
-        System.out.println(" scrcpy-android@test");
-    }
-
-    private static RSAPublicKey derivePublic(PrivateKey priv) throws Exception {
-        if (priv instanceof RSAPrivateCrtKey crt) {
-            RSAPublicKeySpec spec = new RSAPublicKeySpec(crt.getModulus(), crt.getPublicExponent());
-            return (RSAPublicKey) KeyFactory.getInstance("RSA").generatePublic(spec);
-        }
-        throw new IOException("private key is not an RSAPrivateCrtKey");
-    }
-
-    private static byte[] encode(RSAPublicKey pub) {
-        ByteBuffer buf = ByteBuffer.allocate(ENCODED_SIZE).order(ByteOrder.LITTLE_ENDIAN);
-        BigInteger n = pub.getModulus();
-
-        buf.putInt(MODULUS_SIZE_WORDS);
-
-        // n0inv = (2^32) - (N[0] mod 2^32)^-1 mod 2^32
-        BigInteger r32   = BigInteger.ZERO.setBit(32);
-        BigInteger n0inv = n.mod(r32).modInverse(r32);
-        n0inv = r32.subtract(n0inv);
-        buf.putInt(n0inv.intValue());
-
-        buf.put(beToLe(MODULUS_SIZE, n));
-
-        // rr = (2^(MODULUS_SIZE*8))^2 mod N
-        BigInteger rr = BigInteger.ZERO.setBit(MODULUS_SIZE * 8).modPow(BigInteger.TWO, n);
-        buf.put(beToLe(MODULUS_SIZE, rr));
-
-        buf.putInt(pub.getPublicExponent().intValue());
-        return buf.array();
-    }
-
-    private static byte[] beToLe(int len, BigInteger v) {
-        byte[] be = v.toByteArray();
-        // strip leading sign byte if present
-        int start = 0;
-        if (be.length > len) start = be.length - len;
-        byte[] out = new byte[len];
-        for (int i = 0; i < len; i++) {
-            int srcIdx = be.length - 1 - i;
-            if (srcIdx >= start) out[i] = be[srcIdx];
-        }
-        return out;
-    }
-}