=pod

=head1 NAME

OSSL_PROVIDER-default - OpenSSL default provider

=head1 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.

=head2 Properties

The implementations in this provider specifically have this property
defined:

=over 4

=item "provider=default"

=back

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

=head1 OPERATIONS AND ALGORITHMS

The OpenSSL default provider supports these operations and algorithms:

=head2 Hashing Algorithms / Message Digests

=over 4

=item SHA1, see L<EVP_MD-SHA1(7)>

=item SHA2, see L<EVP_MD-SHA2(7)>

=item SHA3, see L<EVP_MD-SHA3(7)>

=item KECCAK, see L<EVP_MD-KECCAK(7)>

=item KECCAK-KMAC, see L<EVP_MD-KECCAK-KMAC(7)>

=item SHAKE, see L<EVP_MD-SHAKE(7)>

=item BLAKE2, see L<EVP_MD-BLAKE2(7)>

=item SM3, see L<EVP_MD-SM3(7)>

=item MD5, see L<EVP_MD-MD5(7)>

=item MD5-SHA1, see L<EVP_MD-MD5-SHA1(7)>

=back

=head2 Symmetric Ciphers

=over 4

=item AES, see L<EVP_CIPHER-AES(7)>

=item ARIA, see L<EVP_CIPHER-ARIA(7)>

=item CAMELLIA, see L<EVP_CIPHER-CAMELLIA(7)>

=item 3DES, see L<EVP_CIPHER-DES(7)>

=item SEED, see L<EVP_CIPHER-SEED(7)>

=item SM4, see L<EVP_CIPHER-SM4(7)>

=item ChaCha20, see L<EVP_CIPHER-CHACHA(7)>

=item ChaCha20-Poly1305, see L<EVP_CIPHER-CHACHA(7)>

=back

=head2 Message Authentication Code (MAC)

=over 4

=item BLAKE2, see L<EVP_MAC-BLAKE2(7)>

=item CMAC, see L<EVP_MAC-CMAC(7)>

=item GMAC, see L<EVP_MAC-GMAC(7)>

=item HMAC, see L<EVP_MAC-HMAC(7)>

=item KMAC, see L<EVP_MAC-KMAC(7)>

=item SIPHASH, see L<EVP_MAC-Siphash(7)>

=item POLY1305, see L<EVP_MAC-Poly1305(7)>

=back

=head2 Key Derivation Function (KDF)

=over 4

=item HKDF, see L<EVP_KDF-HKDF(7)>

=item SSKDF, see L<EVP_KDF-SS(7)>

=item PBKDF2, see L<EVP_KDF-PBKDF2(7)>

=item PKCS12KDF, see L<EVP_KDF-PKCS12KDF(7)>

=item SSHKDF, see L<EVP_KDF-SSHKDF(7)>

=item TLS1-PRF, see L<EVP_KDF-TLS1_PRF(7)>

=item KBKDF, see L<EVP_KDF-KB(7)>

=item X942KDF-ASN1, see L<EVP_KDF-X942-ASN1(7)>

=item X942KDF-CONCAT, see L<EVP_KDF-X942-CONCAT(7)>

=item X963KDF, see L<EVP_KDF-X963(7)>

=item SCRYPT, see L<EVP_KDF-SCRYPT(7)>

=item KRB5KDF, see L<EVP_KDF-KRB5KDF(7)>


=back

=head2 Key Exchange

=over 4

=item DH, see L<EVP_KEYEXCH-DH(7)>

=item ECDH, see L<EVP_KEYEXCH-ECDH(7)>

=item X25519, see L<EVP_KEYEXCH-X25519(7)>

=item X448, see L<EVP_KEYEXCH-X448(7)>

=back

=head2 Asymmetric Signature

=over 4

=item DSA, see L<EVP_SIGNATURE-DSA(7)>

=item RSA, see L<EVP_SIGNATURE-RSA(7)>

=item HMAC, see L<EVP_SIGNATURE-HMAC(7)>

=item SIPHASH, see L<EVP_SIGNATURE-Siphash(7)>

=item POLY1305, see L<EVP_SIGNATURE-Poly1305(7)>

=item CMAC, see L<EVP_SIGNATURE-CMAC(7)>

=back

=head2 Asymmetric Cipher

=over 4

=item RSA, see L<EVP_ASYM_CIPHER-RSA(7)>

=item SM2, see L<EVP_ASYM_CIPHER-SM2(7)>

=back

=head2 Asymmetric Key Encapsulation

=over 4

=item RSA, see L<EVP_KEM-RSA(7)>

=back

=head2 Asymmetric Key Management

=over 4

=item DH, see L<EVP_KEYMGMT-DH(7)>

=item DSA, see L<EVP_KEYMGMT-DSA(7)>

=item RSA, see L<EVP_KEYMGMT-RSA(7)>

=item EC, see L<EVP_KEYMGMT-EC(7)>

=item X25519, see L<EVP_KEYMGMT-X25519(7)>

=item X448, see L<EVP_KEYMGMT-X448(7)>

=back

=head2 Asymmetric Key Encoder

The default provider also includes all of the encoding algorithms
present in the base provider.  Some of these have the property "fips=yes",
to allow them to be used together with the FIPS provider.

=over 4

=item RSA, see L<OSSL_ENCODER-RSA(7)>

=item DH, see L<OSSL_ENCODER-DH(7)>

=item DSA, see L<OSSL_ENCODER-DSA(7)>

=item EC, see L<OSSL_ENCODER-EC(7)>

=item X25519, see L<OSSL_ENCODER-X25519(7)>

=item X448, see L<OSSL_ENCODER-X448(7)>

=back

=head1 SEE ALSO

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

=head1 COPYRIGHT

Copyright 2020-2021 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
L<https://www.openssl.org/source/license.html>.

=cut