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This means that when loaded or created, EC EVP_PKEYs with the SM2 curve will be regarded as EVP_PKEY_SM2 type keys by default. Applications are no longer forced to check and fix this. It's still possible, for those who want this, to set the key type to EVP_PKEY_EC and thereby run the normal EC computations with the SM2 curve. This has to be done explicitly. Reviewed-by: Matt Caswell <matt@openssl.org> Reviewed-by: Dmitry Belyavskiy <beldmit@gmail.com> (Merged from https://github.com/openssl/openssl/pull/10942)
167 lines
6.6 KiB
Plaintext
167 lines
6.6 KiB
Plaintext
=pod
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=head1 NAME
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EVP_PKEY_set1_RSA, EVP_PKEY_set1_DSA, EVP_PKEY_set1_DH, EVP_PKEY_set1_EC_KEY,
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EVP_PKEY_get1_RSA, EVP_PKEY_get1_DSA, EVP_PKEY_get1_DH, EVP_PKEY_get1_EC_KEY,
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EVP_PKEY_get0_RSA, EVP_PKEY_get0_DSA, EVP_PKEY_get0_DH, EVP_PKEY_get0_EC_KEY,
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EVP_PKEY_assign_RSA, EVP_PKEY_assign_DSA, EVP_PKEY_assign_DH,
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EVP_PKEY_assign_EC_KEY, EVP_PKEY_assign_POLY1305, EVP_PKEY_assign_SIPHASH,
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EVP_PKEY_get0_hmac, EVP_PKEY_get0_poly1305, EVP_PKEY_get0_siphash,
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EVP_PKEY_type, EVP_PKEY_id, EVP_PKEY_base_id, EVP_PKEY_set_alias_type,
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EVP_PKEY_set1_engine, EVP_PKEY_get0_engine - EVP_PKEY assignment functions
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=head1 SYNOPSIS
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#include <openssl/evp.h>
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int EVP_PKEY_set1_RSA(EVP_PKEY *pkey, RSA *key);
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int EVP_PKEY_set1_DSA(EVP_PKEY *pkey, DSA *key);
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int EVP_PKEY_set1_DH(EVP_PKEY *pkey, DH *key);
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int EVP_PKEY_set1_EC_KEY(EVP_PKEY *pkey, EC_KEY *key);
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RSA *EVP_PKEY_get1_RSA(EVP_PKEY *pkey);
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DSA *EVP_PKEY_get1_DSA(EVP_PKEY *pkey);
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DH *EVP_PKEY_get1_DH(EVP_PKEY *pkey);
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EC_KEY *EVP_PKEY_get1_EC_KEY(EVP_PKEY *pkey);
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const unsigned char *EVP_PKEY_get0_hmac(const EVP_PKEY *pkey, size_t *len);
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const unsigned char *EVP_PKEY_get0_poly1305(const EVP_PKEY *pkey, size_t *len);
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const unsigned char *EVP_PKEY_get0_siphash(const EVP_PKEY *pkey, size_t *len);
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RSA *EVP_PKEY_get0_RSA(const EVP_PKEY *pkey);
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DSA *EVP_PKEY_get0_DSA(const EVP_PKEY *pkey);
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DH *EVP_PKEY_get0_DH(const EVP_PKEY *pkey);
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EC_KEY *EVP_PKEY_get0_EC_KEY(const EVP_PKEY *pkey);
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int EVP_PKEY_assign_RSA(EVP_PKEY *pkey, RSA *key);
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int EVP_PKEY_assign_DSA(EVP_PKEY *pkey, DSA *key);
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int EVP_PKEY_assign_DH(EVP_PKEY *pkey, DH *key);
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int EVP_PKEY_assign_EC_KEY(EVP_PKEY *pkey, EC_KEY *key);
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int EVP_PKEY_assign_POLY1305(EVP_PKEY *pkey, ASN1_OCTET_STRING *key);
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int EVP_PKEY_assign_SIPHASH(EVP_PKEY *pkey, ASN1_OCTET_STRING *key);
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int EVP_PKEY_id(const EVP_PKEY *pkey);
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int EVP_PKEY_base_id(const EVP_PKEY *pkey);
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int EVP_PKEY_type(int type);
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int EVP_PKEY_set_alias_type(EVP_PKEY *pkey, int type);
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ENGINE *EVP_PKEY_get0_engine(const EVP_PKEY *pkey);
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int EVP_PKEY_set1_engine(EVP_PKEY *pkey, ENGINE *engine);
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=head1 DESCRIPTION
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EVP_PKEY_set1_RSA(), EVP_PKEY_set1_DSA(), EVP_PKEY_set1_DH() and
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EVP_PKEY_set1_EC_KEY() set the key referenced by B<pkey> to B<key>.
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EVP_PKEY_get1_RSA(), EVP_PKEY_get1_DSA(), EVP_PKEY_get1_DH() and
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EVP_PKEY_get1_EC_KEY() return the referenced key in B<pkey> or
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B<NULL> if the key is not of the correct type.
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EVP_PKEY_get0_hmac(), EVP_PKEY_get0_poly1305(), EVP_PKEY_get0_siphash(),
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EVP_PKEY_get0_RSA(), EVP_PKEY_get0_DSA(), EVP_PKEY_get0_DH()
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and EVP_PKEY_get0_EC_KEY() also return the referenced key in B<pkey> or B<NULL>
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if the key is not of the correct type but the reference count of the
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returned key is B<not> incremented and so must not be freed up after use.
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EVP_PKEY_assign_RSA(), EVP_PKEY_assign_DSA(), EVP_PKEY_assign_DH(),
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EVP_PKEY_assign_EC_KEY(), EVP_PKEY_assign_POLY1305() and
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EVP_PKEY_assign_SIPHASH() also set the referenced key to B<key>
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however these use the supplied B<key> internally and so B<key>
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will be freed when the parent B<pkey> is freed.
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EVP_PKEY_base_id() returns the type of B<pkey>. For example
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an RSA key will return B<EVP_PKEY_RSA>.
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EVP_PKEY_id() returns the actual OID associated with B<pkey>. Historically keys
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using the same algorithm could use different OIDs. For example an RSA key could
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use the OIDs corresponding to the NIDs B<NID_rsaEncryption> (equivalent to
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B<EVP_PKEY_RSA>) or B<NID_rsa> (equivalent to B<EVP_PKEY_RSA2>). The use of
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alternative non-standard OIDs is now rare so B<EVP_PKEY_RSA2> et al are not
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often seen in practice.
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EVP_PKEY_type() returns the underlying type of the NID B<type>. For example
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EVP_PKEY_type(EVP_PKEY_RSA2) will return B<EVP_PKEY_RSA>.
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EVP_PKEY_get0_engine() returns a reference to the ENGINE handling B<pkey>.
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EVP_PKEY_set1_engine() sets the ENGINE handling B<pkey> to B<engine>. It
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must be called after the key algorithm and components are set up.
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If B<engine> does not include an B<EVP_PKEY_METHOD> for B<pkey> an
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error occurs.
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EVP_PKEY_set_alias_type() allows modifying a EVP_PKEY to use a
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different set of algorithms than the default.
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=head1 NOTES
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In accordance with the OpenSSL naming convention the key obtained
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from or assigned to the B<pkey> using the B<1> functions must be
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freed as well as B<pkey>.
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EVP_PKEY_assign_RSA(), EVP_PKEY_assign_DSA(), EVP_PKEY_assign_DH(),
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EVP_PKEY_assign_EC_KEY(), EVP_PKEY_assign_POLY1305()
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and EVP_PKEY_assign_SIPHASH() are implemented as macros.
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EVP_PKEY_assign_EC_KEY() looks at the curve name id to determine if
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the passed B<EC_KEY> is an L<SM2(7)> key, and will set the B<EVP_PKEY>
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type to B<EVP_PKEY_SM2> in that case, instead of B<EVP_PKEY_EC>.
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It's possible to switch back and forth between the types B<EVP_PKEY_EC>
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and B<EVP_PKEY_SM2> with a call to EVP_PKEY_set_alias_type() on keys
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assigned with this macro if it's desirable to do a normal EC
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computations with the SM2 curve instead of the special SM2
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computations, and vice versa.
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Most applications wishing to know a key type will simply call
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EVP_PKEY_base_id() and will not care about the actual type:
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which will be identical in almost all cases.
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Previous versions of this document suggested using EVP_PKEY_type(pkey->type)
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to determine the type of a key. Since B<EVP_PKEY> is now opaque this
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is no longer possible: the equivalent is EVP_PKEY_base_id(pkey).
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EVP_PKEY_set1_engine() is typically used by an ENGINE returning an HSM
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key as part of its routine to load a private key.
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=head1 RETURN VALUES
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EVP_PKEY_set1_RSA(), EVP_PKEY_set1_DSA(), EVP_PKEY_set1_DH() and
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EVP_PKEY_set1_EC_KEY() return 1 for success or 0 for failure.
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EVP_PKEY_get1_RSA(), EVP_PKEY_get1_DSA(), EVP_PKEY_get1_DH() and
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EVP_PKEY_get1_EC_KEY() return the referenced key or B<NULL> if
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an error occurred.
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EVP_PKEY_assign_RSA(), EVP_PKEY_assign_DSA(), EVP_PKEY_assign_DH(),
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EVP_PKEY_assign_EC_KEY(), EVP_PKEY_assign_POLY1305()
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and EVP_PKEY_assign_SIPHASH() return 1 for success and 0 for failure.
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EVP_PKEY_base_id(), EVP_PKEY_id() and EVP_PKEY_type() return a key
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type or B<NID_undef> (equivalently B<EVP_PKEY_NONE>) on error.
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EVP_PKEY_set1_engine() returns 1 for success and 0 for failure.
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EVP_PKEY_set_alias_type() returns 1 for success and 0 for error.
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=head1 EXAMPLES
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After loading an ECC key, it is possible to convert it to using SM2
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algorithms with EVP_PKEY_set_alias_type:
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EVP_PKEY_set_alias_type(pkey, EVP_PKEY_SM2);
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=head1 SEE ALSO
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L<EVP_PKEY_new(3)>, L<SM2(7)>
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=head1 COPYRIGHT
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Copyright 2002-2018 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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