src/main/java/org/apache/commons/net/pop3/ExtendedPOP3Client.java [100:109]:
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            final Mac hmacMd5 = Mac.getInstance(MAC_ALGORITHM);
            hmacMd5.init(new SecretKeySpec(password.getBytes(getCharset()), MAC_ALGORITHM));
            // compute the result:
            final byte[] hmacResult = convertToHexString(hmacMd5.doFinal(serverChallenge)).getBytes(getCharset());
            // join the byte arrays to form the reply
            final byte[] userNameBytes = user.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/smtp/AuthenticatingSMTPClient.java [178:187]:
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            final Mac hmacMd5 = Mac.getInstance(MAC_ALGORITHM);
            hmacMd5.init(new SecretKeySpec(password.getBytes(getCharset()), MAC_ALGORITHM));
            // compute the result:
            final byte[] hmacResult = convertToHexString(hmacMd5.doFinal(serverChallenge)).getBytes(getCharset());
            // join the byte arrays to form the reply
            final byte[] userNameBytes = user.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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