SHA-1 MessageDigest not available during WebAS Java install

During the installation of Java Add-In for ABAP, I encountered the following error:

" <b>java.security.NoSuchAlgorithmException: SHA-1 MessageDigest not available</b> at com.sap.sdm.util.security.impl.String2SHAImpl.getSHAString(String2SHAImpl.java:43)".

Did anyone come across this error? What is the issue?

We're running AIX 5.2 with java 1.4.2 build caix64142ifx-20041126, created by IBM for SAP Customers.