OSSL_PROVIDER-DEFAULT(7SSL)

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 on systems that are not operating in FIPS-approved mode: 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)
SHAKE, see EVP_MD-SHAKE(7)
CSHAKE, see EVP_MD-CSHAKE(7)
CSHAKE-KECCAK, see EVP_MD-CSHAKE-KECCAK(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)
ML-DSA-MU, see EVP_MD-ML-DSA-MU(7)

  Symmetric Ciphers

AES, see EVP_CIPHER-AES(7)
ARIA, see EVP_CIPHER-ARIA(7)
CAMELLIA, see EVP_CIPHER-CAMELLIA(7)
3DES, 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)
HKDF-SHA256, see EVP_KDF-HKDF(7)
HKDF-SHA384, see EVP_KDF-HKDF(7)
HKDF-SHA512, 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)
SNMPKDF, see EVP_KDF-SNMPKDF(7)
SRTPKDF, see EVP_KDF-SRTPKDF(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
LMS, see EVP_SIGNATURE-LMS(7)
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
LMS Private keys are not supported for LMS.

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
LMS Private keys are not supported for LMS.

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
Support for LMS Public Key (SubjectPublicKeyInfo) encoders and decoders was added in OpenSSL 4.0.

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

The HKDF-SHA256, HKDF-SHA384 and HKDF-SHA512 algorithms were added in OpenSSL 3.6.

The CSHAKE-128 and CSHAKE-256 algorithms were added in OpenSSL 4.0.

All other functionality was added in OpenSSL 3.0.

COPYRIGHT
Copyright 2020-2026 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>.