src/main/java/org/apache/commons/net/imap/AuthenticatingIMAPClient.java [162:173]:
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            final byte[] serverChallenge = Base64.decodeBase64(getReplyString().substring(2).trim());
            // get the Mac instance
            final Mac hmacMd5 = Mac.getInstance("HmacMD5");
            hmacMd5.init(new SecretKeySpec(password.getBytes(getCharset()), "HmacMD5"));
            // compute the result:
            final byte[] hmacResult = convertToHexString(hmacMd5.doFinal(serverChallenge)).getBytes(getCharset());
            // join the byte arrays to form the reply
            final byte[] usernameBytes = username.getBytes(getCharset());
            final byte[] toEncode = new byte[usernameBytes.length + 1 /* the space */ + hmacResult.length];
            System.arraycopy(usernameBytes, 0, toEncode, 0, usernameBytes.length);
            toEncode[usernameBytes.length] = ' ';
            System.arraycopy(hmacResult, 0, toEncode, usernameBytes.length + 1, hmacResult.length);
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src/main/java/org/apache/commons/net/pop3/ExtendedPOP3Client.java [96:107]:
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            final byte[] serverChallenge = Base64.decodeBase64(getReplyString().substring(2).trim());
            // get the Mac instance
            final Mac hmacMd5 = Mac.getInstance("HmacMD5");
            hmacMd5.init(new SecretKeySpec(password.getBytes(getCharset()), "HmacMD5"));
            // compute the result:
            final byte[] hmacResult = convertToHexString(hmacMd5.doFinal(serverChallenge)).getBytes(getCharset());
            // join the byte arrays to form the reply
            final byte[] usernameBytes = username.getBytes(getCharset());
            final byte[] toEncode = new byte[usernameBytes.length + 1 /* the space */ + hmacResult.length];
            System.arraycopy(usernameBytes, 0, toEncode, 0, usernameBytes.length);
            toEncode[usernameBytes.length] = ' ';
            System.arraycopy(hmacResult, 0, toEncode, usernameBytes.length + 1, hmacResult.length);
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