// Build with FIPSgo build -tags fips // Code automatically uses FIPS when built with tagpackage main import "crypto/sha256" func main() {    data := []byte("test")    hash := sha256.Sum256(data)  // Uses FIPS module when tag is set}

import javax.net.ssl.*;import java.security.Security; // Enable FIPS provider (Bouncy Castle FIPS)Security.addProvider(new BouncyCastleFipsProvider()); // Or use Java's native FIPS support (Java 11+)SSLContext context = SSLContext.getInstance("TLSv1.3", "BCFIPS");context.init(null, null, null); // Use context for FIPS TLSSSLSocketFactory factory = context.getSocketFactory();

from cryptography.hazmat.primitives import hashesfrom cryptography.hazmat.backends import openssl # Check if FIPS is enabledbackend = openssl.backendprint(backend._lib.FIPS_mode_get())  # 1 = FIPS enabled # Use FIPS-approved hashingfrom cryptography.hazmat.primitives import hashesdigest = hashes.Hash(hashes.SHA256(), backend=backend)

// Check FIPS statusconst crypto = require('crypto');console.log(crypto.fips);  // 1 = FIPS enabled // Build Node.js with FIPS// node -gyp configure -- --openssl-fips=/usr/lib/fips// node-gyp build // Use FIPS-approved algorithmsconst hash = crypto.createHash('sha256');hash.update('test');console.log(hash.digest('hex'));

#include <openssl/evp.h>#include <openssl/fips.h> int main() {    // Verify FIPS mode    if (FIPS_mode_get() == 1) {        printf("FIPS mode is ON\n");    }     // Use EVP (high-level) for automatic FIPS support    EVP_MD_CTX *mdctx = EVP_MD_CTX_new();    EVP_DigestInit_ex(mdctx, EVP_sha256(), NULL);    EVP_DigestUpdate(mdctx, "test", 4);    // ...}

// Using openssl crateuse openssl::hash::MessageDigest; fn main() {    let hash = openssl::hash::hash(        MessageDigest::sha256(),        b"test"    ).unwrap();} // Or use rustls for TLS (FIPS OpenSSL backend)use rustls::{ClientConfig, ServerConfig};

using System.Security.Cryptography; class Program {    static void Main() {        // .NET automatically uses FIPS when available        using (var sha256 = SHA256.Create()) {            byte[] hash = sha256.ComputeHash(System.Text.Encoding.UTF8.GetBytes("test"));        }         // Check FIPS status        bool isFips = System.Security.Cryptography.SHA256.Create().GetType().Name.Contains("Managed");    }}

<?php// Check FIPS statusif (openssl_get_cert_locations()['default_cert_file'] !== false) {    echo "OpenSSL available\n";} // Use FIPS-approved algorithms$hash = hash('sha256', 'test');  // SHA-256 (FIPS-approved) // Or with OpenSSL functions$hash = openssl_digest('test', 'sha256');?>

require 'openssl' # Check FIPS modeputs OpenSSL::OPENSSL_VERSION_NUMBER  # Version info # Use FIPS-approved algorithmsdigest = OpenSSL::Digest::SHA256.newdigest << 'test'puts digest.hexdigest # TLS with FIPSrequire 'net/https'http = Net::HTTP.new('example.com', 443)http.use_ssl = truehttp.verify_mode = OpenSSL::SSL::VERIFY_PEER

# Most languages respect FIPS_FORCE_MODE_STATUSexport FIPS_FORCE_MODE_STATUS=1python app.py # Or via OpenSSLexport OPENSSL_FORCE_FIPS_MODE=1java -cp . MyApp # Verifyecho $FIPS_FORCE_MODE_STATUS

# Gogo build -tags fips # Node.jsnode-gyp configure -- --openssl-fips=/usr/lib/fips # Python (already uses system OpenSSL if FIPS-enabled)pip install cryptography # Rubygem install openssl -- --with-openssl-dir=/usr/lib/fips

# Java: Add to JVM argsjava -Dcom.sun.jndi.ldap.connect.pool=false MyApp # .NET: Check FIPS at runtimeif (System.Security.Cryptography.CryptoConfig.AllowOnlyFipsAlgorithms) {    // FIPS is enforced}

# Check if FIPS is activefrom cryptography.hazmat.backends import opensslbackend = openssl.backendprint(backend._lib.FIPS_mode_get())  # Should be 1 # If 0, FIPS module not loaded# Solution: Install libssl3-fips and rebuild

// BAD: MD5 is not FIPS-approvedhash := md5.New()  // Panics in FIPS mode // GOOD: SHA-256 is FIPS-approvedhash := sha256.New()  // Works in FIPS mode

// Some operations may be restricted in FIPS// Solution: Switch to FIPS-approved operation// BAD: RSA with PKCS#1 v1.5 padding// GOOD: RSA with PSS padding (FIPS-approved)