diff --git a/configs/config-no-entropy.h b/configs/config-no-entropy.h
index 502ca0320..433c663be 100644
--- a/configs/config-no-entropy.h
+++ b/configs/config-no-entropy.h
@@ -51,6 +51,8 @@
 #define MBEDTLS_PKCS1_V21
 #define MBEDTLS_SELF_TEST
 #define MBEDTLS_VERSION_FEATURES
+#define MBEDTLS_X509_CHECK_KEY_USAGE
+#define MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE
 
 /* mbed TLS modules */
 #define MBEDTLS_AES_C
@@ -76,6 +78,9 @@
 #define MBEDTLS_SHA256_C
 #define MBEDTLS_SHA512_C
 #define MBEDTLS_VERSION_C
+#define MBEDTLS_X509_USE_C
+#define MBEDTLS_X509_CRT_PARSE_C
+#define MBEDTLS_X509_CRL_PARSE_C
 //#define MBEDTLS_CMAC_C
 
 /* Miscellaneous options */
diff --git a/configs/config-psa-crypto.h b/configs/config-psa-crypto.h
index 3d6d7d311..8fe4567de 100644
--- a/configs/config-psa-crypto.h
+++ b/configs/config-psa-crypto.h
@@ -1024,6 +1024,64 @@
  */
 #define MBEDTLS_VERSION_FEATURES
 
+/**
+ * \def MBEDTLS_X509_ALLOW_EXTENSIONS_NON_V3
+ *
+ * If set, the X509 parser will not break-off when parsing an X509 certificate
+ * and encountering an extension in a v1 or v2 certificate.
+ *
+ * Uncomment to prevent an error.
+ */
+//#define MBEDTLS_X509_ALLOW_EXTENSIONS_NON_V3
+
+/**
+ * \def MBEDTLS_X509_ALLOW_UNSUPPORTED_CRITICAL_EXTENSION
+ *
+ * If set, the X509 parser will not break-off when parsing an X509 certificate
+ * and encountering an unknown critical extension.
+ *
+ * \warning Depending on your PKI use, enabling this can be a security risk!
+ *
+ * Uncomment to prevent an error.
+ */
+//#define MBEDTLS_X509_ALLOW_UNSUPPORTED_CRITICAL_EXTENSION
+
+/**
+ * \def MBEDTLS_X509_CHECK_KEY_USAGE
+ *
+ * Enable verification of the keyUsage extension (CA and leaf certificates).
+ *
+ * Disabling this avoids problems with mis-issued and/or misused
+ * (intermediate) CA and leaf certificates.
+ *
+ * \warning Depending on your PKI use, disabling this can be a security risk!
+ *
+ * Comment to skip keyUsage checking for both CA and leaf certificates.
+ */
+#define MBEDTLS_X509_CHECK_KEY_USAGE
+
+/**
+ * \def MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE
+ *
+ * Enable verification of the extendedKeyUsage extension (leaf certificates).
+ *
+ * Disabling this avoids problems with mis-issued and/or misused certificates.
+ *
+ * \warning Depending on your PKI use, disabling this can be a security risk!
+ *
+ * Comment to skip extendedKeyUsage checking for certificates.
+ */
+#define MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE
+
+/**
+ * \def MBEDTLS_X509_RSASSA_PSS_SUPPORT
+ *
+ * Enable parsing and verification of X.509 certificates, CRLs and CSRS
+ * signed with RSASSA-PSS (aka PKCS#1 v2.1).
+ *
+ * Comment this macro to disallow using RSASSA-PSS in certificates.
+ */
+#define MBEDTLS_X509_RSASSA_PSS_SUPPORT
 /* \} name SECTION: mbed TLS feature support */
 
 /**
@@ -1154,7 +1212,8 @@
  * Enable the generic ASN1 parser.
  *
  * Module:  library/asn1.c
- * Caller:  library/dhm.c
+ * Caller:  library/x509.c
+ *          library/dhm.c
  *          library/pkcs12.c
  *          library/pkcs5.c
  *          library/pkparse.c
@@ -1169,6 +1228,9 @@
  * Module:  library/asn1write.c
  * Caller:  library/ecdsa.c
  *          library/pkwrite.c
+ *          library/x509_create.c
+ *          library/x509write_crt.c
+ *          library/x509write_csr.c
  */
 #define MBEDTLS_ASN1_WRITE_C
 
@@ -1326,6 +1388,18 @@
  */
 #define MBEDTLS_CCM_C
 
+/**
+ * \def MBEDTLS_CERTS_C
+ *
+ * Enable the test certificates.
+ *
+ * Module:  library/certs.c
+ * Caller:
+ *
+ * This module is used for testing (ssl_client/server).
+ */
+#define MBEDTLS_CERTS_C
+
 /**
  * \def MBEDTLS_CHACHA20_C
  *
@@ -1694,6 +1768,13 @@
  *          library/pkparse.c
  *          library/pkwrite.c
  *          library/rsa.c
+ *          library/x509.c
+ *          library/x509_create.c
+ *          library/x509_crl.c
+ *          library/x509_crt.c
+ *          library/x509_csr.c
+ *          library/x509write_crt.c
+ *          library/x509write_csr.c
  *
  * This modules translates between OIDs and internal values.
  */
@@ -1721,6 +1802,9 @@
  * Module:  library/pem.c
  * Caller:  library/dhm.c
  *          library/pkparse.c
+ *          library/x509_crl.c
+ *          library/x509_crt.c
+ *          library/x509_csr.c
  *
  * Requires: MBEDTLS_BASE64_C
  *
@@ -1735,6 +1819,8 @@
  *
  * Module:  library/pem.c
  * Caller:  library/pkwrite.c
+ *          library/x509write_crt.c
+ *          library/x509write_csr.c
  *
  * Requires: MBEDTLS_BASE64_C
  *
@@ -1761,6 +1847,8 @@
  * Enable the generic public (asymetric) key parser.
  *
  * Module:  library/pkparse.c
+ * Caller:  library/x509_crt.c
+ *          library/x509_csr.c
  *
  * Requires: MBEDTLS_PK_C
  *
@@ -1774,6 +1862,7 @@
  * Enable the generic public (asymetric) key writer.
  *
  * Module:  library/pkwrite.c
+ * Caller:  library/x509write.c
  *
  * Requires: MBEDTLS_PK_C
  *
@@ -1794,6 +1883,21 @@
  */
 #define MBEDTLS_PKCS5_C
 
+/**
+ * \def MBEDTLS_PKCS11_C
+ *
+ * Enable wrapper for PKCS#11 smartcard support.
+ *
+ * Module:  library/pkcs11.c
+ * Caller:  library/pk.c
+ *
+ * Requires: MBEDTLS_PK_C
+ *
+ * This module enables SSL/TLS PKCS #11 smartcard support.
+ * Requires the presence of the PKCS#11 helper library (libpkcs11-helper)
+ */
+//#define MBEDTLS_PKCS11_C
+
 /**
  * \def MBEDTLS_PKCS12_C
  *
@@ -1895,6 +1999,7 @@
  *
  * Module:  library/rsa.c
  *          library/rsa_internal.c
+ * Caller:  library/x509.c
  *
  * This module is used by the following key exchanges:
  *      RSA, DHE-RSA, ECDHE-RSA, RSA-PSK
@@ -1910,6 +2015,7 @@
  *
  * Module:  library/sha1.c
  * Caller:  library/md.c
+ *          library/x509write_crt.c
  *
  * This module is required for SSL/TLS up to version 1.1, for TLS 1.2
  * depending on the handshake parameters, and for SHA1-signed certificates.
@@ -2004,6 +2110,106 @@
  */
 #define MBEDTLS_VERSION_C
 
+/**
+ * \def MBEDTLS_X509_USE_C
+ *
+ * Enable X.509 core for using certificates.
+ *
+ * Module:  library/x509.c
+ * Caller:  library/x509_crl.c
+ *          library/x509_crt.c
+ *          library/x509_csr.c
+ *
+ * Requires: MBEDTLS_ASN1_PARSE_C, MBEDTLS_BIGNUM_C, MBEDTLS_OID_C,
+ *           MBEDTLS_PK_PARSE_C
+ *
+ * This module is required for the X.509 parsing modules.
+ */
+#define MBEDTLS_X509_USE_C
+
+/**
+ * \def MBEDTLS_X509_CRT_PARSE_C
+ *
+ * Enable X.509 certificate parsing.
+ *
+ * Module:  library/x509_crt.c
+ * Caller:  library/ssl_cli.c
+ *          library/ssl_srv.c
+ *          library/ssl_tls.c
+ *
+ * Requires: MBEDTLS_X509_USE_C
+ *
+ * This module is required for X.509 certificate parsing.
+ */
+#define MBEDTLS_X509_CRT_PARSE_C
+
+/**
+ * \def MBEDTLS_X509_CRL_PARSE_C
+ *
+ * Enable X.509 CRL parsing.
+ *
+ * Module:  library/x509_crl.c
+ * Caller:  library/x509_crt.c
+ *
+ * Requires: MBEDTLS_X509_USE_C
+ *
+ * This module is required for X.509 CRL parsing.
+ */
+#define MBEDTLS_X509_CRL_PARSE_C
+
+/**
+ * \def MBEDTLS_X509_CSR_PARSE_C
+ *
+ * Enable X.509 Certificate Signing Request (CSR) parsing.
+ *
+ * Module:  library/x509_csr.c
+ * Caller:  library/x509_crt_write.c
+ *
+ * Requires: MBEDTLS_X509_USE_C
+ *
+ * This module is used for reading X.509 certificate request.
+ */
+#define MBEDTLS_X509_CSR_PARSE_C
+
+/**
+ * \def MBEDTLS_X509_CREATE_C
+ *
+ * Enable X.509 core for creating certificates.
+ *
+ * Module:  library/x509_create.c
+ *
+ * Requires: MBEDTLS_BIGNUM_C, MBEDTLS_OID_C, MBEDTLS_PK_WRITE_C
+ *
+ * This module is the basis for creating X.509 certificates and CSRs.
+ */
+#define MBEDTLS_X509_CREATE_C
+
+/**
+ * \def MBEDTLS_X509_CRT_WRITE_C
+ *
+ * Enable creating X.509 certificates.
+ *
+ * Module:  library/x509_crt_write.c
+ *
+ * Requires: MBEDTLS_X509_CREATE_C
+ *
+ * This module is required for X.509 certificate creation.
+ */
+#define MBEDTLS_X509_CRT_WRITE_C
+
+/**
+ * \def MBEDTLS_X509_CSR_WRITE_C
+ *
+ * Enable creating X.509 Certificate Signing Requests (CSR).
+ *
+ * Module:  library/x509_csr_write.c
+ *
+ * Requires: MBEDTLS_X509_CREATE_C
+ *
+ * This module is required for X.509 certificate request writing.
+ */
+#define MBEDTLS_X509_CSR_WRITE_C
+
 /**
  * \def MBEDTLS_XTEA_C
  *
diff --git a/configs/config-suite-b.h b/configs/config-suite-b.h
index 4faaa7718..dd9a2a019 100644
--- a/configs/config-suite-b.h
+++ b/configs/config-suite-b.h
@@ -66,9 +66,12 @@
 #define MBEDTLS_PK_PARSE_C
 #define MBEDTLS_SHA256_C
 #define MBEDTLS_SHA512_C
+#define MBEDTLS_X509_CRT_PARSE_C
+#define MBEDTLS_X509_USE_C
 
 /* For test certificates */
 #define MBEDTLS_BASE64_C
+#define MBEDTLS_CERTS_C
 #define MBEDTLS_PEM_PARSE_C
 
 /* Save RAM at the expense of ROM */
diff --git a/include/mbedtls/check_config.h b/include/mbedtls/check_config.h
index c3a38301c..65a3cc8d4 100644
--- a/include/mbedtls/check_config.h
+++ b/include/mbedtls/check_config.h
@@ -270,6 +270,10 @@
 #error "MBEDTLS_PK_WRITE_C defined, but not all prerequisites"
 #endif
 
+#if defined(MBEDTLS_PKCS11_C) && !defined(MBEDTLS_PK_C)
+#error "MBEDTLS_PKCS11_C defined, but not all prerequisites"
+#endif
+
 #if defined(MBEDTLS_PLATFORM_EXIT_ALT) && !defined(MBEDTLS_PLATFORM_C)
 #error "MBEDTLS_PLATFORM_EXIT_ALT defined, but not all prerequisites"
 #endif
@@ -510,6 +514,11 @@
 #error "MBEDTLS_RSA_C defined, but none of the PKCS1 versions enabled"
 #endif
 
+#if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT) &&                        \
+    ( !defined(MBEDTLS_RSA_C) || !defined(MBEDTLS_PKCS1_V21) )
+#error "MBEDTLS_X509_RSASSA_PSS_SUPPORT defined, but not all prerequisites"
+#endif
+
 #if defined(MBEDTLS_SHA512_NO_SHA384) && !defined(MBEDTLS_SHA512_C)
 #error "MBEDTLS_SHA512_NO_SHA384 defined without MBEDTLS_SHA512_C"
 #endif
@@ -541,6 +550,38 @@
 #error "MBEDTLS_VERSION_FEATURES defined, but not all prerequisites"
 #endif
 
+#if defined(MBEDTLS_X509_USE_C) && ( !defined(MBEDTLS_BIGNUM_C) ||  \
+    !defined(MBEDTLS_OID_C) || !defined(MBEDTLS_ASN1_PARSE_C) ||      \
+    !defined(MBEDTLS_PK_PARSE_C) )
+#error "MBEDTLS_X509_USE_C defined, but not all prerequisites"
+#endif
+
+#if defined(MBEDTLS_X509_CREATE_C) && ( !defined(MBEDTLS_BIGNUM_C) ||  \
+    !defined(MBEDTLS_OID_C) || !defined(MBEDTLS_ASN1_WRITE_C) ||       \
+    !defined(MBEDTLS_PK_WRITE_C) )
+#error "MBEDTLS_X509_CREATE_C defined, but not all prerequisites"
+#endif
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C) && ( !defined(MBEDTLS_X509_USE_C) )
+#error "MBEDTLS_X509_CRT_PARSE_C defined, but not all prerequisites"
+#endif
+
+#if defined(MBEDTLS_X509_CRL_PARSE_C) && ( !defined(MBEDTLS_X509_USE_C) )
+#error "MBEDTLS_X509_CRL_PARSE_C defined, but not all prerequisites"
+#endif
+
+#if defined(MBEDTLS_X509_CSR_PARSE_C) && ( !defined(MBEDTLS_X509_USE_C) )
+#error "MBEDTLS_X509_CSR_PARSE_C defined, but not all prerequisites"
+#endif
+
+#if defined(MBEDTLS_X509_CRT_WRITE_C) && ( !defined(MBEDTLS_X509_CREATE_C) )
+#error "MBEDTLS_X509_CRT_WRITE_C defined, but not all prerequisites"
+#endif
+
+#if defined(MBEDTLS_X509_CSR_WRITE_C) && ( !defined(MBEDTLS_X509_CREATE_C) )
+#error "MBEDTLS_X509_CSR_WRITE_C defined, but not all prerequisites"
+#endif
+
 #if defined(MBEDTLS_HAVE_INT32) && defined(MBEDTLS_HAVE_INT64)
 #error "MBEDTLS_HAVE_INT32 and MBEDTLS_HAVE_INT64 cannot be defined simultaneously"
 #endif /* MBEDTLS_HAVE_INT32 && MBEDTLS_HAVE_INT64 */
diff --git a/include/mbedtls/config.h b/include/mbedtls/config.h
index a728a31e5..f8788d89d 100644
--- a/include/mbedtls/config.h
+++ b/include/mbedtls/config.h
@@ -1125,6 +1125,83 @@
  */
 #define MBEDTLS_VERSION_FEATURES
 
+/**
+ * \def MBEDTLS_X509_ALLOW_EXTENSIONS_NON_V3
+ *
+ * If set, the X509 parser will not break-off when parsing an X509 certificate
+ * and encountering an extension in a v1 or v2 certificate.
+ *
+ * Uncomment to prevent an error.
+ */
+//#define MBEDTLS_X509_ALLOW_EXTENSIONS_NON_V3
+
+/**
+ * \def MBEDTLS_X509_ALLOW_UNSUPPORTED_CRITICAL_EXTENSION
+ *
+ * If set, the X509 parser will not break-off when parsing an X509 certificate
+ * and encountering an unknown critical extension.
+ *
+ * \warning Depending on your PKI use, enabling this can be a security risk!
+ *
+ * Uncomment to prevent an error.
+ */
+//#define MBEDTLS_X509_ALLOW_UNSUPPORTED_CRITICAL_EXTENSION
+
+/**
+ * \def MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK
+ *
+ * If set, this enables the X.509 API `mbedtls_x509_crt_verify_with_ca_cb()`
+ * and the SSL API `mbedtls_ssl_conf_ca_cb()` which allow users to configure
+ * the set of trusted certificates through a callback instead of a linked
+ * list.
+ *
+ * This is useful for example in environments where a large number of trusted
+ * certificates is present and storing them in a linked list isn't efficient
+ * enough, or when the set of trusted certificates changes frequently.
+ *
+ * See the documentation of `mbedtls_x509_crt_verify_with_ca_cb()` and
+ * `mbedtls_ssl_conf_ca_cb()` for more information.
+ *
+ * Uncomment to enable trusted certificate callbacks.
+ */
+//#define MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK
+
+/**
+ * \def MBEDTLS_X509_CHECK_KEY_USAGE
+ *
+ * Enable verification of the keyUsage extension (CA and leaf certificates).
+ *
+ * Disabling this avoids problems with mis-issued and/or misused
+ * (intermediate) CA and leaf certificates.
+ *
+ * \warning Depending on your PKI use, disabling this can be a security risk!
+ *
+ * Comment to skip keyUsage checking for both CA and leaf certificates.
+ */
+#define MBEDTLS_X509_CHECK_KEY_USAGE
+
+/**
+ * \def MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE
+ *
+ * Enable verification of the extendedKeyUsage extension (leaf certificates).
+ *
+ * Disabling this avoids problems with mis-issued and/or misused certificates.
+ *
+ * \warning Depending on your PKI use, disabling this can be a security risk!
+ *
+ * Comment to skip extendedKeyUsage checking for certificates.
+ */
+#define MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE
+
+/**
+ * \def MBEDTLS_X509_RSASSA_PSS_SUPPORT
+ *
+ * Enable parsing and verification of X.509 certificates, CRLs and CSRS
+ * signed with RSASSA-PSS (aka PKCS#1 v2.1).
+ *
+ * Comment this macro to disallow using RSASSA-PSS in certificates.
+ */
+#define MBEDTLS_X509_RSASSA_PSS_SUPPORT
 /* \} name SECTION: mbed TLS feature support */
 
 /**
@@ -1255,7 +1332,8 @@
  * Enable the generic ASN1 parser.
  *
  * Module:  library/asn1.c
- * Caller:  library/dhm.c
+ * Caller:  library/x509.c
+ *          library/dhm.c
  *          library/pkcs12.c
  *          library/pkcs5.c
  *          library/pkparse.c
@@ -1270,6 +1348,9 @@
  * Module:  library/asn1write.c
  * Caller:  library/ecdsa.c
  *          library/pkwrite.c
+ *          library/x509_create.c
+ *          library/x509write_crt.c
+ *          library/x509write_csr.c
  */
 #define MBEDTLS_ASN1_WRITE_C
 
@@ -1427,6 +1508,18 @@
  */
 #define MBEDTLS_CCM_C
 
+/**
+ * \def MBEDTLS_CERTS_C
+ *
+ * Enable the test certificates.
+ *
+ * Module:  library/certs.c
+ * Caller:
+ *
+ * This module is used for testing (ssl_client/server).
+ */
+#define MBEDTLS_CERTS_C
+
 /**
  * \def MBEDTLS_CHACHA20_C
  *
@@ -1799,6 +1892,13 @@
  *          library/pkparse.c
  *          library/pkwrite.c
  *          library/rsa.c
+ *          library/x509.c
+ *          library/x509_create.c
+ *          library/x509_crl.c
+ *          library/x509_crt.c
+ *          library/x509_csr.c
+ *          library/x509write_crt.c
+ *          library/x509write_csr.c
  *
  * This modules translates between OIDs and internal values.
  */
@@ -1826,6 +1926,9 @@
  * Module:  library/pem.c
  * Caller:  library/dhm.c
  *          library/pkparse.c
+ *          library/x509_crl.c
+ *          library/x509_crt.c
+ *          library/x509_csr.c
  *
  * Requires: MBEDTLS_BASE64_C
  *
@@ -1840,6 +1943,8 @@
  *
  * Module:  library/pem.c
  * Caller:  library/pkwrite.c
+ *          library/x509write_crt.c
+ *          library/x509write_csr.c
  *
  * Requires: MBEDTLS_BASE64_C
  *
@@ -1866,6 +1971,8 @@
  * Enable the generic public (asymetric) key parser.
  *
  * Module:  library/pkparse.c
+ * Caller:  library/x509_crt.c
+ *          library/x509_csr.c
  *
  * Requires: MBEDTLS_PK_C
  *
@@ -1879,6 +1986,7 @@
  * Enable the generic public (asymetric) key writer.
  *
  * Module:  library/pkwrite.c
+ * Caller:  library/x509write.c
  *
  * Requires: MBEDTLS_PK_C
  *
@@ -1899,6 +2007,21 @@
  */
 #define MBEDTLS_PKCS5_C
 
+/**
+ * \def MBEDTLS_PKCS11_C
+ *
+ * Enable wrapper for PKCS#11 smartcard support.
+ *
+ * Module:  library/pkcs11.c
+ * Caller:  library/pk.c
+ *
+ * Requires: MBEDTLS_PK_C
+ *
+ * This module enables SSL/TLS PKCS #11 smartcard support.
+ * Requires the presence of the PKCS#11 helper library (libpkcs11-helper)
+ */
+//#define MBEDTLS_PKCS11_C
+
 /**
  * \def MBEDTLS_PKCS12_C
  *
@@ -2020,6 +2143,7 @@
  *
  * Module:  library/rsa.c
  *          library/rsa_internal.c
+ * Caller:  library/x509.c
  *
  * This module is used by the following key exchanges:
  *      RSA, DHE-RSA, ECDHE-RSA, RSA-PSK
@@ -2035,6 +2159,7 @@
  *
  * Module:  library/sha1.c
  * Caller:  library/md.c
+ *          library/x509write_crt.c
  *
  * This module is required for SSL/TLS up to version 1.1, for TLS 1.2
  * depending on the handshake parameters, and for SHA1-signed certificates.
@@ -2129,6 +2254,106 @@
  */
 #define MBEDTLS_VERSION_C
 
+/**
+ * \def MBEDTLS_X509_USE_C
+ *
+ * Enable X.509 core for using certificates.
+ *
+ * Module:  library/x509.c
+ * Caller:  library/x509_crl.c
+ *          library/x509_crt.c
+ *          library/x509_csr.c
+ *
+ * Requires: MBEDTLS_ASN1_PARSE_C, MBEDTLS_BIGNUM_C, MBEDTLS_OID_C,
+ *           MBEDTLS_PK_PARSE_C
+ *
+ * This module is required for the X.509 parsing modules.
+ */
+#define MBEDTLS_X509_USE_C
+
+/**
+ * \def MBEDTLS_X509_CRT_PARSE_C
+ *
+ * Enable X.509 certificate parsing.
+ *
+ * Module:  library/x509_crt.c
+ * Caller:  library/ssl_cli.c
+ *          library/ssl_srv.c
+ *          library/ssl_tls.c
+ *
+ * Requires: MBEDTLS_X509_USE_C
+ *
+ * This module is required for X.509 certificate parsing.
+ */
+#define MBEDTLS_X509_CRT_PARSE_C
+
+/**
+ * \def MBEDTLS_X509_CRL_PARSE_C
+ *
+ * Enable X.509 CRL parsing.
+ *
+ * Module:  library/x509_crl.c
+ * Caller:  library/x509_crt.c
+ *
+ * Requires: MBEDTLS_X509_USE_C
+ *
+ * This module is required for X.509 CRL parsing.
+ */
+#define MBEDTLS_X509_CRL_PARSE_C
+
+/**
+ * \def MBEDTLS_X509_CSR_PARSE_C
+ *
+ * Enable X.509 Certificate Signing Request (CSR) parsing.
+ *
+ * Module:  library/x509_csr.c
+ * Caller:  library/x509_crt_write.c
+ *
+ * Requires: MBEDTLS_X509_USE_C
+ *
+ * This module is used for reading X.509 certificate request.
+ */
+#define MBEDTLS_X509_CSR_PARSE_C
+
+/**
+ * \def MBEDTLS_X509_CREATE_C
+ *
+ * Enable X.509 core for creating certificates.
+ *
+ * Module:  library/x509_create.c
+ *
+ * Requires: MBEDTLS_BIGNUM_C, MBEDTLS_OID_C, MBEDTLS_PK_WRITE_C
+ *
+ * This module is the basis for creating X.509 certificates and CSRs.
+ */
+#define MBEDTLS_X509_CREATE_C
+
+/**
+ * \def MBEDTLS_X509_CRT_WRITE_C
+ *
+ * Enable creating X.509 certificates.
+ *
+ * Module:  library/x509_crt_write.c
+ *
+ * Requires: MBEDTLS_X509_CREATE_C
+ *
+ * This module is required for X.509 certificate creation.
+ */
+#define MBEDTLS_X509_CRT_WRITE_C
+
+/**
+ * \def MBEDTLS_X509_CSR_WRITE_C
+ *
+ * Enable creating X.509 Certificate Signing Requests (CSR).
+ *
+ * Module:  library/x509_csr_write.c
+ *
+ * Requires: MBEDTLS_X509_CREATE_C
+ *
+ * This module is required for X.509 certificate request writing.
+ */
+#define MBEDTLS_X509_CSR_WRITE_C
+
 /**
  * \def MBEDTLS_XTEA_C
  *
diff --git a/library/version_features.c b/library/version_features.c
index e2dc9b152..22089af70 100644
--- a/library/version_features.c
+++ b/library/version_features.c
@@ -429,6 +429,24 @@ static const char * const features[] = {
 #if defined(MBEDTLS_VERSION_FEATURES)
     "MBEDTLS_VERSION_FEATURES",
 #endif /* MBEDTLS_VERSION_FEATURES */
+#if defined(MBEDTLS_X509_ALLOW_EXTENSIONS_NON_V3)
+    "MBEDTLS_X509_ALLOW_EXTENSIONS_NON_V3",
+#endif /* MBEDTLS_X509_ALLOW_EXTENSIONS_NON_V3 */
+#if defined(MBEDTLS_X509_ALLOW_UNSUPPORTED_CRITICAL_EXTENSION)
+    "MBEDTLS_X509_ALLOW_UNSUPPORTED_CRITICAL_EXTENSION",
+#endif /* MBEDTLS_X509_ALLOW_UNSUPPORTED_CRITICAL_EXTENSION */
+#if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK)
+    "MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK",
+#endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */
+#if defined(MBEDTLS_X509_CHECK_KEY_USAGE)
+    "MBEDTLS_X509_CHECK_KEY_USAGE",
+#endif /* MBEDTLS_X509_CHECK_KEY_USAGE */
+#if defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE)
+    "MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE",
+#endif /* MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE */
+#if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT)
+    "MBEDTLS_X509_RSASSA_PSS_SUPPORT",
+#endif /* MBEDTLS_X509_RSASSA_PSS_SUPPORT */
 #if defined(MBEDTLS_AESNI_C)
     "MBEDTLS_AESNI_C",
 #endif /* MBEDTLS_AESNI_C */
@@ -462,6 +480,9 @@ static const char * const features[] = {
 #if defined(MBEDTLS_CCM_C)
     "MBEDTLS_CCM_C",
 #endif /* MBEDTLS_CCM_C */
+#if defined(MBEDTLS_CERTS_C)
+    "MBEDTLS_CERTS_C",
+#endif /* MBEDTLS_CERTS_C */
 #if defined(MBEDTLS_CHACHA20_C)
     "MBEDTLS_CHACHA20_C",
 #endif /* MBEDTLS_CHACHA20_C */
@@ -555,6 +576,9 @@ static const char * const features[] = {
 #if defined(MBEDTLS_PKCS5_C)
     "MBEDTLS_PKCS5_C",
 #endif /* MBEDTLS_PKCS5_C */
+#if defined(MBEDTLS_PKCS11_C)
+    "MBEDTLS_PKCS11_C",
+#endif /* MBEDTLS_PKCS11_C */
 #if defined(MBEDTLS_PKCS12_C)
     "MBEDTLS_PKCS12_C",
 #endif /* MBEDTLS_PKCS12_C */
@@ -600,6 +624,27 @@ static const char * const features[] = {
 #if defined(MBEDTLS_VERSION_C)
     "MBEDTLS_VERSION_C",
 #endif /* MBEDTLS_VERSION_C */
+#if defined(MBEDTLS_X509_USE_C)
+    "MBEDTLS_X509_USE_C",
+#endif /* MBEDTLS_X509_USE_C */
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+    "MBEDTLS_X509_CRT_PARSE_C",
+#endif /* MBEDTLS_X509_CRT_PARSE_C */
+#if defined(MBEDTLS_X509_CRL_PARSE_C)
+    "MBEDTLS_X509_CRL_PARSE_C",
+#endif /* MBEDTLS_X509_CRL_PARSE_C */
+#if defined(MBEDTLS_X509_CSR_PARSE_C)
+    "MBEDTLS_X509_CSR_PARSE_C",
+#endif /* MBEDTLS_X509_CSR_PARSE_C */
+#if defined(MBEDTLS_X509_CREATE_C)
+    "MBEDTLS_X509_CREATE_C",
+#endif /* MBEDTLS_X509_CREATE_C */
+#if defined(MBEDTLS_X509_CRT_WRITE_C)
+    "MBEDTLS_X509_CRT_WRITE_C",
+#endif /* MBEDTLS_X509_CRT_WRITE_C */
+#if defined(MBEDTLS_X509_CSR_WRITE_C)
+    "MBEDTLS_X509_CSR_WRITE_C",
+#endif /* MBEDTLS_X509_CSR_WRITE_C */
 #if defined(MBEDTLS_XTEA_C)
     "MBEDTLS_XTEA_C",
 #endif /* MBEDTLS_XTEA_C */
diff --git a/programs/test/query_config.c b/programs/test/query_config.c
index 32194f5f0..6dc4a003c 100644
--- a/programs/test/query_config.c
+++ b/programs/test/query_config.c
@@ -1186,6 +1186,54 @@ int query_config( const char *config )
     }
 #endif /* MBEDTLS_VERSION_FEATURES */
 
+#if defined(MBEDTLS_X509_ALLOW_EXTENSIONS_NON_V3)
+    if( strcmp( "MBEDTLS_X509_ALLOW_EXTENSIONS_NON_V3", config ) == 0 )
+    {
+        MACRO_EXPANSION_TO_STR( MBEDTLS_X509_ALLOW_EXTENSIONS_NON_V3 );
+        return( 0 );
+    }
+#endif /* MBEDTLS_X509_ALLOW_EXTENSIONS_NON_V3 */
+
+#if defined(MBEDTLS_X509_ALLOW_UNSUPPORTED_CRITICAL_EXTENSION)
+    if( strcmp( "MBEDTLS_X509_ALLOW_UNSUPPORTED_CRITICAL_EXTENSION", config ) == 0 )
+    {
+        MACRO_EXPANSION_TO_STR( MBEDTLS_X509_ALLOW_UNSUPPORTED_CRITICAL_EXTENSION );
+        return( 0 );
+    }
+#endif /* MBEDTLS_X509_ALLOW_UNSUPPORTED_CRITICAL_EXTENSION */
+
+#if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK)
+    if( strcmp( "MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK", config ) == 0 )
+    {
+        MACRO_EXPANSION_TO_STR( MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK );
+        return( 0 );
+    }
+#endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */
+
+#if defined(MBEDTLS_X509_CHECK_KEY_USAGE)
+    if( strcmp( "MBEDTLS_X509_CHECK_KEY_USAGE", config ) == 0 )
+    {
+        MACRO_EXPANSION_TO_STR( MBEDTLS_X509_CHECK_KEY_USAGE );
+        return( 0 );
+    }
+#endif /* MBEDTLS_X509_CHECK_KEY_USAGE */
+
+#if defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE)
+    if( strcmp( "MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE", config ) == 0 )
+    {
+        MACRO_EXPANSION_TO_STR( MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE );
+        return( 0 );
+    }
+#endif /* MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE */
+
+#if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT)
+    if( strcmp( "MBEDTLS_X509_RSASSA_PSS_SUPPORT", config ) == 0 )
+    {
+        MACRO_EXPANSION_TO_STR( MBEDTLS_X509_RSASSA_PSS_SUPPORT );
+        return( 0 );
+    }
+#endif /* MBEDTLS_X509_RSASSA_PSS_SUPPORT */
+
 #if defined(MBEDTLS_AESNI_C)
     if( strcmp( "MBEDTLS_AESNI_C", config ) == 0 )
     {
@@ -1274,6 +1322,14 @@ int query_config( const char *config )
     }
 #endif /* MBEDTLS_CCM_C */
 
+#if defined(MBEDTLS_CERTS_C)
+    if( strcmp( "MBEDTLS_CERTS_C", config ) == 0 )
+    {
+        MACRO_EXPANSION_TO_STR( MBEDTLS_CERTS_C );
+        return( 0 );
+    }
+#endif /* MBEDTLS_CERTS_C */
+
 #if defined(MBEDTLS_CHACHA20_C)
     if( strcmp( "MBEDTLS_CHACHA20_C", config ) == 0 )
     {
@@ -1522,6 +1578,14 @@ int query_config( const char *config )
     }
 #endif /* MBEDTLS_PKCS5_C */
 
+#if defined(MBEDTLS_PKCS11_C)
+    if( strcmp( "MBEDTLS_PKCS11_C", config ) == 0 )
+    {
+        MACRO_EXPANSION_TO_STR( MBEDTLS_PKCS11_C );
+        return( 0 );
+    }
+#endif /* MBEDTLS_PKCS11_C */
+
 #if defined(MBEDTLS_PKCS12_C)
     if( strcmp( "MBEDTLS_PKCS12_C", config ) == 0 )
     {
@@ -1642,6 +1706,62 @@ int query_config( const char *config )
     }
 #endif /* MBEDTLS_VERSION_C */
 
+#if defined(MBEDTLS_X509_USE_C)
+    if( strcmp( "MBEDTLS_X509_USE_C", config ) == 0 )
+    {
+        MACRO_EXPANSION_TO_STR( MBEDTLS_X509_USE_C );
+        return( 0 );
+    }
+#endif /* MBEDTLS_X509_USE_C */
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+    if( strcmp( "MBEDTLS_X509_CRT_PARSE_C", config ) == 0 )
+    {
+        MACRO_EXPANSION_TO_STR( MBEDTLS_X509_CRT_PARSE_C );
+        return( 0 );
+    }
+#endif /* MBEDTLS_X509_CRT_PARSE_C */
+
+#if defined(MBEDTLS_X509_CRL_PARSE_C)
+    if( strcmp( "MBEDTLS_X509_CRL_PARSE_C", config ) == 0 )
+    {
+        MACRO_EXPANSION_TO_STR( MBEDTLS_X509_CRL_PARSE_C );
+        return( 0 );
+    }
+#endif /* MBEDTLS_X509_CRL_PARSE_C */
+
+#if defined(MBEDTLS_X509_CSR_PARSE_C)
+    if( strcmp( "MBEDTLS_X509_CSR_PARSE_C", config ) == 0 )
+    {
+        MACRO_EXPANSION_TO_STR( MBEDTLS_X509_CSR_PARSE_C );
+        return( 0 );
+    }
+#endif /* MBEDTLS_X509_CSR_PARSE_C */
+
+#if defined(MBEDTLS_X509_CREATE_C)
+    if( strcmp( "MBEDTLS_X509_CREATE_C", config ) == 0 )
+    {
+        MACRO_EXPANSION_TO_STR( MBEDTLS_X509_CREATE_C );
+        return( 0 );
+    }
+#endif /* MBEDTLS_X509_CREATE_C */
+
+#if defined(MBEDTLS_X509_CRT_WRITE_C)
+    if( strcmp( "MBEDTLS_X509_CRT_WRITE_C", config ) == 0 )
+    {
+        MACRO_EXPANSION_TO_STR( MBEDTLS_X509_CRT_WRITE_C );
+        return( 0 );
+    }
+#endif /* MBEDTLS_X509_CRT_WRITE_C */
+
+#if defined(MBEDTLS_X509_CSR_WRITE_C)
+    if( strcmp( "MBEDTLS_X509_CSR_WRITE_C", config ) == 0 )
+    {
+        MACRO_EXPANSION_TO_STR( MBEDTLS_X509_CSR_WRITE_C );
+        return( 0 );
+    }
+#endif /* MBEDTLS_X509_CSR_WRITE_C */
+
 #if defined(MBEDTLS_XTEA_C)
     if( strcmp( "MBEDTLS_XTEA_C", config ) == 0 )
     {
diff --git a/scripts/config.py b/scripts/config.py
index 6d4828a95..df2d3d51d 100755
--- a/scripts/config.py
+++ b/scripts/config.py
@@ -177,6 +177,7 @@ def include_in_full(name):
             'MBEDTLS_NO_DEFAULT_ENTROPY_SOURCES',
             'MBEDTLS_NO_PLATFORM_ENTROPY',
             'MBEDTLS_NO_UDBL_DIVISION',
+            'MBEDTLS_PKCS11_C',
             'MBEDTLS_PLATFORM_NO_STD_FUNCTIONS',
             'MBEDTLS_PSA_CRYPTO_KEY_FILE_ID_ENCODES_OWNER',
             'MBEDTLS_PSA_CRYPTO_SE_C',
@@ -185,6 +186,8 @@ def include_in_full(name):
             'MBEDTLS_RSA_NO_CRT',
             'MBEDTLS_SHA512_NO_SHA384',
             'MBEDTLS_TEST_NULL_ENTROPY',
+            'MBEDTLS_X509_ALLOW_EXTENSIONS_NON_V3',
+            'MBEDTLS_X509_ALLOW_UNSUPPORTED_CRITICAL_EXTENSION',
     ]:
         return False
     if name.endswith('_ALT'):
diff --git a/tests/scripts/depends-pkalgs.pl b/tests/scripts/depends-pkalgs.pl
index 7fbd6d71e..c05edaacf 100755
--- a/tests/scripts/depends-pkalgs.pl
+++ b/tests/scripts/depends-pkalgs.pl
@@ -39,9 +39,10 @@ my %algs = (
     'MBEDTLS_ECP_C'     => ['MBEDTLS_ECDSA_C',
                             'MBEDTLS_ECDH_C',
                             'MBEDTLS_ECJPAKE_C'],
-    'MBEDTLS_PKCS1_V21' => [],
+    'MBEDTLS_X509_RSASSA_PSS_SUPPORT'   => [],
+    'MBEDTLS_PKCS1_V21' => ['MBEDTLS_X509_RSASSA_PSS_SUPPORT'],
     'MBEDTLS_PKCS1_V15' => [],
-    'MBEDTLS_RSA_C'     => [],
+    'MBEDTLS_RSA_C'     => ['MBEDTLS_X509_RSASSA_PSS_SUPPORT'],
 );
 
 system( "cp $config_h $config_h.bak" ) and die;