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Jasypt Spring Boot
There is a newer version: 3.0.5
package com.ulisesbocchio.jasyptspringboot.environment;

import com.ulisesbocchio.jasyptspringboot.EncryptablePropertyDetector;
import com.ulisesbocchio.jasyptspringboot.EncryptablePropertyResolver;
import com.ulisesbocchio.jasyptspringboot.EncryptablePropertySource;
import com.ulisesbocchio.jasyptspringboot.InterceptionMode;
import com.ulisesbocchio.jasyptspringboot.aop.EncryptableMutablePropertySourcesInterceptor;
import com.ulisesbocchio.jasyptspringboot.detector.DefaultPropertyDetector;
import com.ulisesbocchio.jasyptspringboot.encryptor.DefaultLazyEncryptor;
import com.ulisesbocchio.jasyptspringboot.resolver.DefaultPropertyResolver;
import org.jasypt.encryption.StringEncryptor;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.aop.framework.ProxyFactory;
import org.springframework.aop.support.AopUtils;
import org.springframework.core.convert.support.ConfigurableConversionService;
import org.springframework.core.env.*;

import java.util.Map;
import java.util.stream.StreamSupport;

import static com.ulisesbocchio.jasyptspringboot.EncryptablePropertySourceConverter.instantiatePropertySource;
import static com.ulisesbocchio.jasyptspringboot.EncryptablePropertySourceConverter.proxyPropertySource;
import static java.util.stream.Collectors.toList;

/**
 * @author Ulises Bocchio
 */
public class EncryptableEnvironmentProxy implements ConfigurableEnvironment {
    private static final Logger LOG = LoggerFactory.getLogger(EncryptableEnvironmentProxy.class);
    private final ConfigurableEnvironment delegate;
    private final ConfigurablePropertyResolver propertyResolver;
    private MutablePropertySources propertySources;

    public EncryptableEnvironmentProxy(ConfigurableEnvironment delegate) {
        this(delegate, discoverEncryptor(delegate));
    }

    public EncryptableEnvironmentProxy(ConfigurableEnvironment delegate, EncryptablePropertyDetector detector) {
        this(delegate, new DefaultPropertyResolver(discoverEncryptor(delegate), detector));
    }

    public EncryptableEnvironmentProxy(ConfigurableEnvironment delegate, StringEncryptor encryptor) {
        this(delegate, new DefaultPropertyResolver(encryptor, new DefaultPropertyDetector()));
    }

    public EncryptableEnvironmentProxy(ConfigurableEnvironment delegate, StringEncryptor encryptor, EncryptablePropertyDetector detector) {
        this(delegate, new DefaultPropertyResolver(encryptor, detector));
    }

    public EncryptableEnvironmentProxy(ConfigurableEnvironment delegate, EncryptablePropertyResolver encryptablePropertyResolver) {
        super();
        this.delegate = delegate;
        propertySources = makeEncryptable(delegate.getPropertySources(), delegate, encryptablePropertyResolver);
        propertyResolver = new PropertySourcesPropertyResolver(propertySources);
    }

    private static StringEncryptor discoverEncryptor(ConfigurableEnvironment delegate) {
        return new DefaultLazyEncryptor(delegate);
    }

    private MutablePropertySources makeEncryptable(MutablePropertySources propertySources, Environment environment, EncryptablePropertyResolver encryptablePropertyResolver) {
        StreamSupport.stream(propertySources.spliterator(), false)
                .filter(ps -> !(ps instanceof EncryptablePropertySource))
                .map(s -> makeEncryptable(s, environment, encryptablePropertyResolver))
                .collect(toList())
                .forEach(ps -> propertySources.replace(ps.getName(), ps));
        return proxy(propertySources, environment, encryptablePropertyResolver);
    }

    private MutablePropertySources proxy(MutablePropertySources propertySources, Environment environment, EncryptablePropertyResolver encryptablePropertyResolver) {
        ProxyFactory proxyFactory = new ProxyFactory();
        proxyFactory.setTargetClass(MutablePropertySources.class);
        proxyFactory.setProxyTargetClass(true);
        proxyFactory.setTarget(propertySources);
        proxyFactory.addAdvice(new EncryptableMutablePropertySourcesInterceptor(ps -> makeEncryptable(ps, environment, encryptablePropertyResolver)));
        return (MutablePropertySources) proxyFactory.getProxy();
    }

    private  PropertySource makeEncryptable(PropertySource propertySource, Environment environment, EncryptablePropertyResolver encryptablePropertyResolver) {
        PropertySource encryptablePropertySource = getInterceptionMode(environment) == InterceptionMode.PROXY
                ? proxyPropertySource(propertySource, encryptablePropertyResolver) : instantiatePropertySource(propertySource, encryptablePropertyResolver);
        LOG.info("Converting PropertySource {} [{}] to {}", propertySource.getName(), propertySource.getClass().getName(),
                AopUtils.isAopProxy(encryptablePropertySource) ? "AOP Proxy" : encryptablePropertySource.getClass().getSimpleName());
        return encryptablePropertySource;
    }

    private InterceptionMode getInterceptionMode(Environment environment) {
        return environment.getProperty("jasypt.encryptor.proxyPropertySources", Boolean.TYPE, false) ? InterceptionMode.PROXY : InterceptionMode.WRAPPER;
    }

    @Override
    public void addActiveProfile(String profile) {
        delegate.addActiveProfile(profile);
    }

    @Override
    public MutablePropertySources getPropertySources() {
        return propertySources;
    }

    @Override
    public Map getSystemEnvironment() {
        return delegate.getSystemEnvironment();
    }

    @Override
    public Map getSystemProperties() {
        return delegate.getSystemProperties();
    }

    @Override
    public void merge(ConfigurableEnvironment parent) {
        delegate.merge(parent);
    }

    @Override
    public ConfigurableConversionService getConversionService() {
        return propertyResolver.getConversionService();
    }

    @Override
    public void setConversionService(ConfigurableConversionService conversionService) {
        propertyResolver.setConversionService(conversionService);
    }

    @Override
    public void setPlaceholderPrefix(String placeholderPrefix) {
        propertyResolver.setPlaceholderPrefix(placeholderPrefix);
    }

    @Override
    public void setPlaceholderSuffix(String placeholderSuffix) {
        propertyResolver.setPlaceholderSuffix(placeholderSuffix);
    }

    @Override
    public void setValueSeparator(String valueSeparator) {
        propertyResolver.setValueSeparator(valueSeparator);
    }

    @Override
    public void setIgnoreUnresolvableNestedPlaceholders(boolean ignoreUnresolvableNestedPlaceholders) {
        propertyResolver.setIgnoreUnresolvableNestedPlaceholders(ignoreUnresolvableNestedPlaceholders);
    }

    @Override
    public void setRequiredProperties(String... requiredProperties) {
        propertyResolver.setRequiredProperties(requiredProperties);
    }

    @Override
    public void validateRequiredProperties() throws MissingRequiredPropertiesException {
        propertyResolver.validateRequiredProperties();
    }

    @Override
    public String[] getActiveProfiles() {
        return delegate.getActiveProfiles();
    }

    @Override
    public void setActiveProfiles(String... profiles) {
        delegate.setActiveProfiles(profiles);
    }

    @Override
    public String[] getDefaultProfiles() {
        return delegate.getDefaultProfiles();
    }

    @Override
    public void setDefaultProfiles(String... profiles) {
        delegate.setDefaultProfiles(profiles);
    }

    @Override
    public boolean acceptsProfiles(String... profiles) {
        return delegate.acceptsProfiles(profiles);
    }

    @Override
    public boolean containsProperty(String key) {
        return propertyResolver.containsProperty(key);
    }

    @Override
    public String getProperty(String key) {
        return propertyResolver.getProperty(key);
    }

    @Override
    public String getProperty(String key, String defaultValue) {
        return propertyResolver.getProperty(key, defaultValue);
    }

    @Override
    public  T getProperty(String key, Class targetType) {
        return propertyResolver.getProperty(key, targetType);
    }

    @Override
    public  T getProperty(String key, Class targetType, T defaultValue) {
        return propertyResolver.getProperty(key, targetType, defaultValue);
    }

    @Override
    public  Class getPropertyAsClass(String key, Class targetType) {
        return propertyResolver.getPropertyAsClass(key, targetType);
    }

    @Override
    public String getRequiredProperty(String key) throws IllegalStateException {
        return propertyResolver.getRequiredProperty(key);
    }

    @Override
    public  T getRequiredProperty(String key, Class targetType) throws IllegalStateException {
        return propertyResolver.getRequiredProperty(key, targetType);
    }

    @Override
    public String resolvePlaceholders(String text) {
        return propertyResolver.resolvePlaceholders(text);
    }

    @Override
    public String resolveRequiredPlaceholders(String text) throws IllegalArgumentException {
        return propertyResolver.resolveRequiredPlaceholders(text);
    }
}