Replace SpringUtils in DelegatingPasswordEncoder.UnmappedIdPasswordEncoder

[ChristianHoesel]

Expected Behavior

The class org.springframework.security.crypto.password.DelegatingPasswordEncoder.UnmappedIdPasswordEncoder should not use org.springframework.util.StringUtils to allow usage in non Spring environments.

Current Behavior

org.springframework:spring-core has to be within my dependencies to use the DelegatingPasswordEncoder and it's only used in one methode

spring-security/crypto/src/main/java/org/springframework/security/crypto/password/DelegatingPasswordEncoder.java

Line 298 in d3332e1

public boolean matches(CharSequence rawPassword, String prefixEncodedPassword) {

Right now the dependency to org.springframework:spring-core is optional and for the usage of the most PasswordEncoder implementations not necessary.

The Usage of StringUtils can easily be replaced.

Context
I am having an Eclipse RCP (OSGi) project, where I want to use the DelegatingPasswordEncoder right away without adding org.springframework:spring-core to my dependencies.

[kse-music]

I found that in KeyStoreKeyFactory not only StringUtils but also Resource are used.