Node.js crypto.constants Property

Last Updated : 31 Mar, 2021

The crypto.constants property is used to get all the commonly used constants of crypto and security-related operations. This returns objects containing crypto constants.

Syntax:

crypto.constants

Return value: This property returns an Object containing commonly used constants used in crypto module.

Example: This example print all the commonly used constants used in crypto module.

index.js

// Importing the crypto library 
const crypto = require("crypto") 
  
// Storing the constants inside the variable 
let constants = crypto.constants 
  
// Printing the constants 
console.log(constants)

Run index.js file using below command:

node index.js

Output:

[Object: null prototype] {
  OPENSSL_VERSION_NUMBER: 269488303,
  SSL_OP_ALL: 2147485780,
  SSL_OP_ALLOW_NO_DHE_KEX: 1024,
  SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION: 262144,
  SSL_OP_CIPHER_SERVER_PREFERENCE: 4194304,
  SSL_OP_CISCO_ANYCONNECT: 32768,
  SSL_OP_COOKIE_EXCHANGE: 8192,
  SSL_OP_CRYPTOPRO_TLSEXT_BUG: 2147483648,
  SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS: 2048,
  SSL_OP_EPHEMERAL_RSA: 0,
  SSL_OP_LEGACY_SERVER_CONNECT: 4,
  SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER: 0,
  SSL_OP_MICROSOFT_SESS_ID_BUG: 0,
  SSL_OP_MSIE_SSLV2_RSA_PADDING: 0,
  SSL_OP_NETSCAPE_CA_DN_BUG: 0,
  SSL_OP_NETSCAPE_CHALLENGE_BUG: 0,
  SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG: 0,
  SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG: 0,
  SSL_OP_NO_COMPRESSION: 131072,
  SSL_OP_NO_ENCRYPT_THEN_MAC: 524288,
  SSL_OP_NO_QUERY_MTU: 4096,
  SSL_OP_NO_RENEGOTIATION: 1073741824,
  SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION: 65536,
  SSL_OP_NO_SSLv2: 0,
  SSL_OP_NO_SSLv3: 33554432,
  SSL_OP_NO_TICKET: 16384,
  SSL_OP_NO_TLSv1: 67108864,
  SSL_OP_NO_TLSv1_1: 268435456,
  SSL_OP_NO_TLSv1_2: 134217728,
  SSL_OP_NO_TLSv1_3: 536870912,
  SSL_OP_PKCS1_CHECK_1: 0,
  SSL_OP_PKCS1_CHECK_2: 0,
  SSL_OP_PRIORITIZE_CHACHA: 2097152,
  SSL_OP_SINGLE_DH_USE: 0,
  SSL_OP_SINGLE_ECDH_USE: 0,
  SSL_OP_SSLEAY_080_CLIENT_DH_BUG: 0,
  SSL_OP_SSLREF2_REUSE_CERT_TYPE_BUG: 0,
  SSL_OP_TLS_BLOCK_PADDING_BUG: 0,
  SSL_OP_TLS_D5_BUG: 0,
  SSL_OP_TLS_ROLLBACK_BUG: 8388608,
  ENGINE_METHOD_RSA: 1,
  ENGINE_METHOD_DSA: 2,
  ENGINE_METHOD_DH: 4,
  ENGINE_METHOD_RAND: 8,
  ENGINE_METHOD_EC: 2048,
  ENGINE_METHOD_CIPHERS: 64,
  ENGINE_METHOD_DIGESTS: 128,
  ENGINE_METHOD_PKEY_METHS: 512,
  ENGINE_METHOD_PKEY_ASN1_METHS: 1024,
  ENGINE_METHOD_ALL: 65535,
  ENGINE_METHOD_NONE: 0,
  DH_CHECK_P_NOT_SAFE_PRIME: 2,
  DH_CHECK_P_NOT_PRIME: 1,
  DH_UNABLE_TO_CHECK_GENERATOR: 4,
  DH_NOT_SUITABLE_GENERATOR: 8,
  ALPN_ENABLED: 1,
  RSA_PKCS1_PADDING: 1,
  RSA_SSLV23_PADDING: 2,
  RSA_NO_PADDING: 3,
  RSA_PKCS1_OAEP_PADDING: 4,
  RSA_X931_PADDING: 5,
  RSA_PKCS1_PSS_PADDING: 6,
  RSA_PSS_SALTLEN_DIGEST: -1,
  RSA_PSS_SALTLEN_MAX_SIGN: -2,
  RSA_PSS_SALTLEN_AUTO: -2,
  defaultCoreCipherList: 'TLS_AES_256_GCM_SHA384:TLS_CHACHA20_POLY1305_SHA256:TLS_AES_128_GCM_SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA256:ECDHE-RSA-AES256-SHA384:DHE-RSA-AES256-SHA384:ECDHE-RSA-AES256-SHA256:DHE-RSA-AES256-SHA256:HIGH:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!MD5:!PSK:!SRP:!CAMELLIA',
  TLS1_VERSION: 769,
  TLS1_1_VERSION: 770,
  TLS1_2_VERSION: 771,
  TLS1_3_VERSION: 772,
  POINT_CONVERSION_COMPRESSED: 2,
  POINT_CONVERSION_UNCOMPRESSED: 4,
  POINT_CONVERSION_HYBRID: 6
}

Reference:https://nodejs.org/api/crypto.html#crypto_crypto_constants

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