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make ascii armor parsing more resiliant

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This commit is contained in:
Daniel Gultsch 2021-02-24 11:05:11 +01:00
parent 073b6a998a
commit d889c02a0a
2 changed files with 8 additions and 3 deletions
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2
src/main/java/eu/siacs/conversations/crypto/PgpEngine.java
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@ -164,7 +164,7 @@ public class PgpEngine {
params.setAction(OpenPgpApi.ACTION_DECRYPT_VERIFY);
try {
params.putExtra(OpenPgpApi.RESULT_DETACHED_SIGNATURE, AsciiArmor.decode(signature));
} catch (final IllegalArgumentException e) {
} catch (final Exception e) {
Log.d(Config.LOGTAG, "unable to parse signature", e);
return 0;
}

9
src/main/java/eu/siacs/conversations/utils/AsciiArmor.java
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@ -14,8 +14,13 @@ public class AsciiArmor {
final List<String> lines = Splitter.on('\n').splitToList(Strings.nullToEmpty(input).trim());
if (lines.size() == 1) {
final String line = lines.get(0);
final String cleaned = line.substring(0, line.lastIndexOf("="));
return BaseEncoding.base64().decode(cleaned);
if (line.length() > 1) {
final int end = line.lastIndexOf('=');
if (end >= 1) {
final String cleaned = line.substring(0, end);
return BaseEncoding.base64().decode(cleaned);
}
}
}
final String withoutChecksum;
if (Iterables.getLast(lines).charAt(0) == '=') {