src/main/java/org/apache/xml/security/utils/Base64.java [166:194]:
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        bitlen = ((bitlen + 7) >> 3) << 3;

        if (bitlen < big.bitLength()) {
            throw new IllegalArgumentException(I18n.translate("utils.Base64.IllegalBitlength"));
        }

        byte[] bigBytes = big.toByteArray();

        if (big.bitLength() % 8 != 0
            && big.bitLength() / 8 + 1 == bitlen / 8) {
            return bigBytes;
        }

        // some copying needed
        int startSrc = 0;    // no need to skip anything
        int bigLen = bigBytes.length;    //valid length of the string

        if (big.bitLength() % 8 == 0) {    // correct values
            startSrc = 1;    // skip sign bit

            bigLen--;    // valid length of the string
        }

        int startDst = bitlen / 8 - bigLen;    //pad with leading nulls
        byte[] resizedBytes = new byte[bitlen / 8];

        System.arraycopy(bigBytes, startSrc, resizedBytes, startDst, bigLen);

        return resizedBytes;
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src/main/java/org/apache/xml/security/utils/XMLUtils.java [1041:1069]:
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        bitlen = ((bitlen + 7) >> 3) << 3;

        if (bitlen < big.bitLength()) {
            throw new IllegalArgumentException(I18n.translate("utils.Base64.IllegalBitlength"));
        }

        byte[] bigBytes = big.toByteArray();

        if (big.bitLength() % 8 != 0
            && big.bitLength() / 8 + 1 == bitlen / 8) {
            return bigBytes;
        }

        // some copying needed
        int startSrc = 0;    // no need to skip anything
        int bigLen = bigBytes.length;    //valid length of the string

        if (big.bitLength() % 8 == 0) {    // correct values
            startSrc = 1;    // skip sign bit

            bigLen--;    // valid length of the string
        }

        int startDst = bitlen / 8 - bigLen;    //pad with leading nulls
        byte[] resizedBytes = new byte[bitlen / 8];

        System.arraycopy(bigBytes, startSrc, resizedBytes, startDst, bigLen);

        return resizedBytes;
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