diff options
Diffstat (limited to 'OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpKeyHelper.java')
| -rw-r--r-- | OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpKeyHelper.java | 334 |
1 files changed, 0 insertions, 334 deletions
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpKeyHelper.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpKeyHelper.java deleted file mode 100644 index 78d1a857f..000000000 --- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpKeyHelper.java +++ /dev/null @@ -1,334 +0,0 @@ -/* - * Copyright (C) 2012-2014 Dominik Schürmann <dominik@dominikschuermann.de> - * Copyright (C) 2010-2014 Thialfihar <thi@thialfihar.org> - * - * This program is free software: you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation, either version 3 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program. If not, see <http://www.gnu.org/licenses/>. - */ - -package org.sufficientlysecure.keychain.pgp; - -import android.content.Context; -import android.graphics.Color; -import android.text.Spannable; -import android.text.SpannableStringBuilder; -import android.text.style.ForegroundColorSpan; - -import org.spongycastle.asn1.ASN1ObjectIdentifier; -import org.spongycastle.asn1.nist.NISTNamedCurves; -import org.spongycastle.asn1.teletrust.TeleTrusTNamedCurves; -import org.spongycastle.bcpg.PublicKeyAlgorithmTags; -import org.spongycastle.util.encoders.Hex; -import org.sufficientlysecure.keychain.Constants; -import org.sufficientlysecure.keychain.R; -import org.sufficientlysecure.keychain.service.SaveKeyringParcel.Algorithm; -import org.sufficientlysecure.keychain.service.SaveKeyringParcel.Curve; -import org.sufficientlysecure.keychain.util.Log; - -import java.security.DigestException; -import java.security.MessageDigest; -import java.security.NoSuchAlgorithmException; -import java.util.Locale; - -public class PgpKeyHelper { - - public static String getAlgorithmInfo(int algorithm, Integer keySize, String oid) { - return getAlgorithmInfo(null, algorithm, keySize, oid); - } - - /** - * Based on <a href="http://tools.ietf.org/html/rfc2440#section-9.1">OpenPGP Message Format</a> - */ - public static String getAlgorithmInfo(Context context, int algorithm, Integer keySize, String oid) { - String algorithmStr; - - switch (algorithm) { - case PublicKeyAlgorithmTags.RSA_ENCRYPT: - case PublicKeyAlgorithmTags.RSA_GENERAL: - case PublicKeyAlgorithmTags.RSA_SIGN: { - algorithmStr = "RSA"; - break; - } - case PublicKeyAlgorithmTags.DSA: { - algorithmStr = "DSA"; - break; - } - - case PublicKeyAlgorithmTags.ELGAMAL_ENCRYPT: - case PublicKeyAlgorithmTags.ELGAMAL_GENERAL: { - algorithmStr = "ElGamal"; - break; - } - - case PublicKeyAlgorithmTags.ECDSA: { - if (oid == null) { - return "ECDSA"; - } - String oidName = PgpKeyHelper.getCurveInfo(context, oid); - return "ECDSA (" + oidName + ")"; - } - case PublicKeyAlgorithmTags.ECDH: { - if (oid == null) { - return "ECDH"; - } - String oidName = PgpKeyHelper.getCurveInfo(context, oid); - return "ECDH (" + oidName + ")"; - } - - default: { - if (context != null) { - algorithmStr = context.getResources().getString(R.string.unknown_algorithm); - } else { - algorithmStr = "unknown"; - } - break; - } - } - if (keySize != null && keySize > 0) - return algorithmStr + ", " + keySize + " bit"; - else - return algorithmStr; - } - - public static String getAlgorithmInfo(Algorithm algorithm, Integer keySize, Curve curve) { - return getAlgorithmInfo(null, algorithm, keySize, curve); - } - - /** - * Based on <a href="http://tools.ietf.org/html/rfc2440#section-9.1">OpenPGP Message Format</a> - */ - public static String getAlgorithmInfo(Context context, Algorithm algorithm, Integer keySize, Curve curve) { - String algorithmStr; - - switch (algorithm) { - case RSA: { - algorithmStr = "RSA"; - break; - } - case DSA: { - algorithmStr = "DSA"; - break; - } - - case ELGAMAL: { - algorithmStr = "ElGamal"; - break; - } - - case ECDSA: { - algorithmStr = "ECDSA"; - if (curve != null) { - algorithmStr += " (" + getCurveInfo(context, curve) + ")"; - } - return algorithmStr; - } - case ECDH: { - algorithmStr = "ECDH"; - if (curve != null) { - algorithmStr += " (" + getCurveInfo(context, curve) + ")"; - } - return algorithmStr; - } - - default: { - if (context != null) { - algorithmStr = context.getResources().getString(R.string.unknown_algorithm); - } else { - algorithmStr = "unknown"; - } - break; - } - } - if (keySize != null && keySize > 0) - return algorithmStr + ", " + keySize + " bit"; - else - return algorithmStr; - } - - /** - * Return name of a curve. These are names, no need for translation - */ - public static String getCurveInfo(Context context, Curve curve) { - switch (curve) { - case NIST_P256: - return "NIST P-256"; - case NIST_P384: - return "NIST P-384"; - case NIST_P521: - return "NIST P-521"; - - /* see SaveKeyringParcel - case BRAINPOOL_P256: - return "Brainpool P-256"; - case BRAINPOOL_P384: - return "Brainpool P-384"; - case BRAINPOOL_P512: - return "Brainpool P-512"; - */ - } - if (context != null) { - return context.getResources().getString(R.string.unknown_algorithm); - } else { - return "unknown"; - } - } - - public static String getCurveInfo(Context context, String oidStr) { - ASN1ObjectIdentifier oid = new ASN1ObjectIdentifier(oidStr); - - String name; - name = NISTNamedCurves.getName(oid); - if (name != null) { - return name; - } - name = TeleTrusTNamedCurves.getName(oid); - if (name != null) { - return name; - } - if (context != null) { - return context.getResources().getString(R.string.unknown_algorithm); - } else { - return "unknown"; - } - } - - /** - * Converts fingerprint to hex - * <p/> - * Fingerprint is shown using lowercase characters. Studies have shown that humans can - * better differentiate between numbers and letters when letters are lowercase. - * - * @param fingerprint - * @return - */ - public static String convertFingerprintToHex(byte[] fingerprint) { - return Hex.toHexString(fingerprint).toLowerCase(Locale.ENGLISH); - } - - /** - * Convert key id from long to 64 bit hex string - * <p/> - * V4: "The Key ID is the low-order 64 bits of the fingerprint" - * <p/> - * see http://tools.ietf.org/html/rfc4880#section-12.2 - * - * @param keyId - * @return - */ - public static String convertKeyIdToHex(long keyId) { - long upper = keyId >> 32; - if (upper == 0) { - // this is a short key id - return convertKeyIdToHexShort(keyId); - } - return "0x" + convertKeyIdToHex32bit(keyId >> 32) + convertKeyIdToHex32bit(keyId); - } - - public static String convertKeyIdToHexShort(long keyId) { - return "0x" + convertKeyIdToHex32bit(keyId); - } - - private static String convertKeyIdToHex32bit(long keyId) { - String hexString = Long.toHexString(keyId & 0xffffffffL).toLowerCase(Locale.ENGLISH); - while (hexString.length() < 8) { - hexString = "0" + hexString; - } - return hexString; - } - - - public static SpannableStringBuilder colorizeFingerprint(String fingerprint) { - // split by 4 characters - fingerprint = fingerprint.replaceAll("(.{4})(?!$)", "$1 "); - - // add line breaks to have a consistent "image" that can be recognized - char[] chars = fingerprint.toCharArray(); - chars[24] = '\n'; - fingerprint = String.valueOf(chars); - - SpannableStringBuilder sb = new SpannableStringBuilder(fingerprint); - try { - // for each 4 characters of the fingerprint + 1 space - for (int i = 0; i < fingerprint.length(); i += 5) { - int spanEnd = Math.min(i + 4, fingerprint.length()); - String fourChars = fingerprint.substring(i, spanEnd); - - int raw = Integer.parseInt(fourChars, 16); - byte[] bytes = {(byte) ((raw >> 8) & 0xff - 128), (byte) (raw & 0xff - 128)}; - int[] color = getRgbForData(bytes); - int r = color[0]; - int g = color[1]; - int b = color[2]; - - // we cannot change black by multiplication, so adjust it to an almost-black grey, - // which will then be brightened to the minimal brightness level - if (r == 0 && g == 0 && b == 0) { - r = 1; - g = 1; - b = 1; - } - - // Convert rgb to brightness - double brightness = 0.2126 * r + 0.7152 * g + 0.0722 * b; - - // If a color is too dark to be seen on black, - // then brighten it up to a minimal brightness. - if (brightness < 80) { - double factor = 80.0 / brightness; - r = Math.min(255, (int) (r * factor)); - g = Math.min(255, (int) (g * factor)); - b = Math.min(255, (int) (b * factor)); - - // If it is too light, then darken it to a respective maximal brightness. - } else if (brightness > 180) { - double factor = 180.0 / brightness; - r = (int) (r * factor); - g = (int) (g * factor); - b = (int) (b * factor); - } - - // Create a foreground color with the 3 digest integers as RGB - // and then converting that int to hex to use as a color - sb.setSpan(new ForegroundColorSpan(Color.rgb(r, g, b)), - i, spanEnd, Spannable.SPAN_INCLUSIVE_INCLUSIVE); - } - } catch (Exception e) { - Log.e(Constants.TAG, "Colorization failed", e); - // if anything goes wrong, then just display the fingerprint without colour, - // instead of partially correct colour or wrong colours - return new SpannableStringBuilder(fingerprint); - } - - return sb; - } - - /** - * Converts the given bytes to a unique RGB color using SHA1 algorithm - * - * @param bytes - * @return an integer array containing 3 numeric color representations (Red, Green, Black) - * @throws java.security.NoSuchAlgorithmException - * @throws java.security.DigestException - */ - private static int[] getRgbForData(byte[] bytes) throws NoSuchAlgorithmException, DigestException { - MessageDigest md = MessageDigest.getInstance("SHA1"); - - md.update(bytes); - byte[] digest = md.digest(); - - return new int[]{((int) digest[0] + 256) % 256, - ((int) digest[1] + 256) % 256, - ((int) digest[2] + 256) % 256}; - } - -} |