NAME

OSSL_PROVIDER-default - OpenSSL default provider


DESCRIPTION

The OpenSSL default provider supplies the majority of OpenSSL's diverse algorithm implementations. If an application doesn't specify anything else explicitly (e.g. in the application or via config), then this is the provider that will be used as fallback: It is loaded automatically the first time that an algorithm is fetched from a provider or a function acting on providers is called and no other provider has been loaded yet.

If an attempt to load a provider has already been made (whether successful or not) then the default provider won't be loaded automatically. Therefore if the default provider is to be used in conjunction with other providers then it must be loaded explicitly. Automatic loading of the default provider only occurs a maximum of once; if the default provider is explicitly unloaded then the default provider will not be automatically loaded again.

Properties

The implementations in this provider specifically have this property defined:

"provider=default"

It may be used in a property query string with fetching functions such as EVP_MD_fetch(3) or EVP_CIPHER_fetch(3), as well as with other functions that take a property query string, such as EVP_PKEY_CTX_new_from_name(3).

It isn't mandatory to query for this property, except to make sure to get implementations of this provider and none other.

Some implementations may define additional properties. Exact information is listed below


OPERATIONS AND ALGORITHMS

The OpenSSL default provider supports these operations and algorithms:

Hashing Algorithms / Message Digests

SHA1, see EVP_MD-SHA1(7)
SHA2, see EVP_MD-SHA2(7)
SHA3, see EVP_MD-SHA3(7)
KECCAK, see EVP_MD-KECCAK(7)
KECCAK-KMAC, see EVP_MD-KECCAK-KMAC(7)
SHAKE, see EVP_MD-SHAKE(7)
BLAKE2, see EVP_MD-BLAKE2(7)
SM3, see EVP_MD-SM3(7)
MD5, see EVP_MD-MD5(7)
MD5-SHA1, see EVP_MD-MD5-SHA1(7)
RIPEMD160, see EVP_MD-RIPEMD160(7)
NULL, see EVP_MD-NULL(7)

Symmetric Ciphers

AES, see EVP_CIPHER-AES(7)
ARIA, see EVP_CIPHER-ARIA(7)
CAMELLIA, see EVP_CIPHER-CAMELLIA(7)
  • DES, see EVP_CIPHER-DES(7)
    SM4, see EVP_CIPHER-SM4(7)
    ChaCha20, see EVP_CIPHER-CHACHA(7)
    ChaCha20-Poly1305, see EVP_CIPHER-CHACHA(7)
    NULL, see EVP_CIPHER-NULL(7)
  • Message Authentication Code (MAC)

    BLAKE2, see EVP_MAC-BLAKE2(7)
    CMAC, see EVP_MAC-CMAC(7)
    GMAC, see EVP_MAC-GMAC(7)
    HMAC, see EVP_MAC-HMAC(7)
    KMAC, see EVP_MAC-KMAC(7)
    SIPHASH, see EVP_MAC-Siphash(7)
    POLY1305, see EVP_MAC-Poly1305(7)

    Key Derivation Function (KDF)

    HKDF, see EVP_KDF-HKDF(7)
    TLS13-KDF, see EVP_KDF-TLS13_KDF(7)
    SSKDF, see EVP_KDF-SS(7)
    PBKDF2, see EVP_KDF-PBKDF2(7)
    PKCS12KDF, see EVP_KDF-PKCS12KDF(7)
    SSHKDF, see EVP_KDF-SSHKDF(7)
    TLS1-PRF, see EVP_KDF-TLS1_PRF(7)
    KBKDF, see EVP_KDF-KB(7)
    X942KDF-ASN1, see EVP_KDF-X942-ASN1(7)
    X942KDF-CONCAT, see EVP_KDF-X942-CONCAT(7)
    X963KDF, see EVP_KDF-X963(7)
    SCRYPT, see EVP_KDF-SCRYPT(7)
    KRB5KDF, see EVP_KDF-KRB5KDF(7)
    HMAC-DRBG, see EVP_KDF-HMAC-DRBG(7)
    ARGON2, see EVP_KDF-ARGON2(7)

    Key Exchange

    DH, see EVP_KEYEXCH-DH(7)
    ECDH, see EVP_KEYEXCH-ECDH(7)
    X25519, see EVP_KEYEXCH-X25519(7)
    X448, see EVP_KEYEXCH-X448(7)
    ML-KEM-512, see EVP_KEM-ML-KEM-512(7)
    ML-KEM-768, see EVP_KEM-ML-KEM-768(7)
    ML-KEM-1024, see EVP_KEM-ML-KEM-1024(7)
    TLS1-PRF
    HKDF
    SCRYPT

    Asymmetric Signature

    DSA, see EVP_SIGNATURE-DSA(7)
    RSA, see EVP_SIGNATURE-RSA(7)
    ED25519, see EVP_SIGNATURE-ED25519(7)
    ED448, see EVP_SIGNATURE-ED448(7)
    ECDSA, see EVP_SIGNATURE-ECDSA(7)
    SM2
    ML-DSA-44, see EVP_SIGNATURE-ML-DSA(7)
    ML-DSA-65, see EVP_SIGNATURE-ML-DSA(7)
    ML-DSA-87, see EVP_SIGNATURE-ML-DSA(7)
    HMAC, see EVP_SIGNATURE-HMAC(7)
    SIPHASH, see EVP_SIGNATURE-Siphash(7)
    POLY1305, see EVP_SIGNATURE-Poly1305(7)
    CMAC, see EVP_SIGNATURE-CMAC(7)
    SLH-DSA-SHA2-128s, see EVP_SIGNATURE-SLH-DSA(7)
    SLH-DSA-SHA2-128f, see EVP_SIGNATURE-SLH-DSA(7)
    SLH-DSA-SHA2-192s, see EVP_SIGNATURE-SLH-DSA(7)
    SLH-DSA-SHA2-192f, see EVP_SIGNATURE-SLH-DSA(7)
    SLH-DSA-SHA2-256s, see EVP_SIGNATURE-SLH-DSA(7)
    SLH-DSA-SHA2-256f, see EVP_SIGNATURE-SLH-DSA(7)
    SLH-DSA-SHAKE-128s, see EVP_SIGNATURE-SLH-DSA(7)
    SLH-DSA-SHAKE-128f, see EVP_SIGNATURE-SLH-DSA(7)
    SLH-DSA-SHAKE-192s, see EVP_SIGNATURE-SLH-DSA(7)
    SLH-DSA-SHAKE-192f, see EVP_SIGNATURE-SLH-DSA(7)
    SLH-DSA-SHAKE-256s, see EVP_SIGNATURE-SLH-DSA(7)
    SLH-DSA-SHAKE-256f, see EVP_SIGNATURE-SLH-DSA(7)

    Asymmetric Cipher

    RSA, see EVP_ASYM_CIPHER-RSA(7)
    SM2, see EVP_ASYM_CIPHER-SM2(7)

    Asymmetric Key Encapsulation

    RSA, see EVP_KEM-RSA(7)
    X25519, see EVP_KEM-X25519(7)
    X448, see EVP_KEM-X448(7)
    EC, see EVP_KEM-EC(7)
    ML-KEM-512, see EVP_KEM-ML-KEM-512(7)
    ML-KEM-768, see EVP_KEM-ML-KEM-768(7)
    ML-KEM-1024, see EVP_KEM-ML-KEM-1024(7)

    Asymmetric Key Management

    DSA, see EVP_KEYMGMT-DSA(7)
    RSA, see EVP_KEYMGMT-RSA(7)
    RSA-PSS
    EC, see EVP_KEYMGMT-EC(7)
    ED25519, see EVP_KEYMGMT-ED25519(7)
    ED448, see EVP_KEYMGMT-ED448(7)
    SM2, see EVP_KEYMGMT-SM2(7)
    DH, see EVP_KEYMGMT-DH(7)
    DHX, see EVP_KEYMGMT-DHX(7)
    X25519, see EVP_KEYMGMT-X25519(7)
    X448, see EVP_KEYMGMT-X448(7)
    ML-DSA-44, see EVP_KEYMGMT-ML-DSA(7)
    ML-DSA-65, see EVP_KEYMGMT-ML-DSA(7)
    ML-DSA-87, see EVP_KEYMGMT-ML-DSA(7)
    MK-KEM-512, see EVP_KEYMGMT-ML-KEM-512(7)
    MK-KEM-768, see EVP_KEYMGMT-ML-KEM-768(7)
    MK-KEM-1024, see EVP_KEYMGMT-ML-KEM-1024(7)
    SLH-DSA-SHA2-128s, see EVP_KEYMGMT-SLH-DSA(7)
    SLH-DSA-SHA2-128f, see EVP_KEYMGMT-SLH-DSA(7)
    SLH-DSA-SHA2-192s, see EVP_KEYMGMT-SLH-DSA(7)
    SLH-DSA-SHA2-192f, see EVP_KEYMGMT-SLH-DSA(7)
    SLH-DSA-SHA2-256s, see EVP_KEYMGMT-SLH-DSA(7)
    SLH-DSA-SHA2-256f, see EVP_KEYMGMT-SLH-DSA(7)
    SLH-DSA-SHAKE-128s, see EVP_KEYMGMT-SLH-DSA(7)
    SLH-DSA-SHAKE-128f, see EVP_KEYMGMT-SLH-DSA(7)
    SLH-DSA-SHAKE-192s, see EVP_KEYMGMT-SLH-DSA(7)
    SLH-DSA-SHAKE-192f, see EVP_KEYMGMT-SLH-DSA(7)
    SLH-DSA-SHAKE-256s, see EVP_KEYMGMT-SLH-DSA(7)
    SLH-DSA-SHAKE-256f, see EVP_KEYMGMT-SLH-DSA(7)
    TLS1-PRF
    HKDF
    SCRYPT
    HMAC, see EVP_KEYMGMT-HMAC(7)
    SIPHASH, see EVP_KEYMGMT-Siphash(7)
    POLY1305, see EVP_KEYMGMT-Poly1305(7)
    CMAC, see EVP_KEYMGMT-CMAC(7)

    Random Number Generation

    CTR-DRBG, see EVP_RAND-CTR-DRBG(7)
    HASH-DRBG, see EVP_RAND-HASH-DRBG(7)
    HMAC-DRBG, see EVP_RAND-HMAC-DRBG(7)
    SEED-SRC, see EVP_RAND-SEED-SRC(7)
    JITTER, see EVP_RAND-JITTER(7)
    TEST-RAND, see EVP_RAND-TEST-RAND(7)

    In addition to this provider, the "SEED-SRC" and "JITTER" algorithms are also available in the base provider.

    Asymmetric Key Encoder

    RSA
    RSA-PSS
    DH
    DHX
    DSA
    EC
    ED25519
    ED448
    X25519
    X448
    SM2
    ML-DSA-44
    ML-DSA-65
    ML-DSA-87
    ML-KEM-512
    ML-KEM-768
    ML-KEM-1024
    SLH-DSA-SHA2-128s
    SLH-DSA-SHA2-128f
    SLH-DSA-SHA2-192s
    SLH-DSA-SHA2-192f
    SLH-DSA-SHA2-256s
    SLH-DSA-SHA2-256f
    SLH-DSA-SHAKE-128s
    SLH-DSA-SHAKE-128f
    SLH-DSA-SHAKE-192s
    SLH-DSA-SHAKE-192f
    SLH-DSA-SHAKE-256s
    SLH-DSA-SHAKE-256f

    In addition to this provider, all of these encoding algorithms are also available in the base provider. Some of these algorithms may be used in combination with the FIPS provider.

    Asymmetric Key Decoder

    RSA
    RSA-PSS
    DH
    DHX
    DSA
    EC
    ED25519
    ED448
    X25519
    X448
    SM2
    ML-DSA-44
    ML-DSA-65
    ML-DSA-87
    ML-KEM-512
    ML-KEM-768
    ML-KEM-1024
    SLH-DSA-SHA2-128s
    SLH-DSA-SHA2-128f
    SLH-DSA-SHA2-192s
    SLH-DSA-SHA2-192f
    SLH-DSA-SHA2-256s
    SLH-DSA-SHA2-256f
    SLH-DSA-SHAKE-128s
    SLH-DSA-SHAKE-128f
    SLH-DSA-SHAKE-192s
    SLH-DSA-SHAKE-192f
    SLH-DSA-SHAKE-256s
    SLH-DSA-SHAKE-256f

    In addition to this provider, all of these decoding algorithms are also available in the base provider. Some of these algorithms may be used in combination with the FIPS provider.

    Stores

    file
    org.openssl.winstore, see OSSL_STORE-winstore(7)

    In addition to this provider, all of these store algorithms are also available in the base provider.


    SEE ALSO

    openssl-core.h(7), openssl-core_dispatch.h(7), provider(7), OSSL_PROVIDER-base(7)


    HISTORY

    The RIPEMD160 digest was added to the default provider in OpenSSL 3.0.7.

    All other functionality was added in OpenSSL 3.0.


    COPYRIGHT

    Copyright 2020-2025 The OpenSSL Project Authors. All Rights Reserved.

    Licensed under the Apache License 2.0 (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at https://www.openssl.org/source/license.html.