Not working with Liferay 6.2 EE

[rsinelle]

When I try to publish to Liferay 6.2 EE, I have an exception
22:37:11,691 ERROR [http-bio-8080-exec-8][SecureFilter:115] java.lang.StringIndexOutOfBoundsException: String index out of range: 27
java.lang.StringIndexOutOfBoundsException: String index out of range: 27
at java.lang.String.charAt(String.java:658)
at com.liferay.portal.kernel.util.Base64.decode(Base64.java:52)
at com.liferay.portal.util.PortalImpl.getBasicAuthUserId(PortalImpl.java:1175)
at com.liferay.portal.util.PortalImpl.getBasicAuthUserId(PortalImpl.java:1156)
at com.liferay.portal.util.PortalUtil.getBasicAuthUserId(PortalUtil.java:281)
at com.liferay.portal.servlet.filters.secure.SecureFilter.basicAuth(SecureFilter.java:112)
at com.liferay.portal.servlet.filters.secure.SecureFilter.processFilter(SecureFilter.java:288)
at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:59)

After some debugging, Liferay use a specific Base64Encoder... If i use the same, the publish process work.
Add the following code to PostFileUtil
public String encode(byte[] raw) {
return encode(raw, 0, raw.length);
}
public String encode(byte[] raw, int offset, int length) {
int lastIndex = Math.min(raw.length, offset + length);

    StringBuilder sb = new StringBuilder(
        ((lastIndex - offset) / 3 + 1) * 4);

    for (int i = offset; i < lastIndex; i += 3) {
        sb.append(encodeBlock(raw, i, lastIndex));
    }

    return sb.toString();
}   
protected char[] encodeBlock(byte[] raw, int offset, int lastIndex) {
    int block = 0;
    int slack = lastIndex - offset - 1;
    int end = slack < 2 ? slack : 2;

    for (int i = 0; i <= end; i++) {
        byte b = raw[offset + i];

        int neuter = b >= 0 ? ((int) (b)) : b + 256;
        block += neuter << 8 * (2 - i);
    }

    char[] base64 = new char[4];

    for (int i = 0; i < 4; i++) {
        int sixbit = block >>> 6 * (3 - i) & 0x3f;
        base64[i] = getChar(sixbit);
    }

    if (slack < 1) {
        base64[2] = '=';
    }

    if (slack < 2) {
        base64[3] = '=';
    }

    return base64;
}   
protected static char getChar(int sixbit) {
    if ((sixbit >= 0) && (sixbit <= 25)) {
        return (char)(65 + sixbit);
    }

    if ((sixbit >= 26) && (sixbit <= 51)) {
        return (char)(97 + (sixbit - 26));
    }

    if ((sixbit >= 52) && (sixbit <= 61)) {
        return (char)(48 + (sixbit - 52));
    }

    if (sixbit == 62) {
        return '+';
    }

    return sixbit != 63 ? '?' : '/';
}   

and replace the line :
String encoding = Base64.encodeBase64URLSafeString((username + ":" + password).getBytes());
by
String encoding = encode((username + ":" + password).getBytes());