=head1 NAME
-EVP_PKEY_size,
-EVP_SignInit, EVP_SignInit_ex, EVP_SignUpdate, EVP_SignFinal,
-EVP_PKEY_security_bits - EVP signing
-functions
+EVP_SignInit, EVP_SignInit_ex, EVP_SignUpdate, EVP_SignFinal
+- EVP signing functions
=head1 SYNOPSIS
void EVP_SignInit(EVP_MD_CTX *ctx, const EVP_MD *type);
- int EVP_PKEY_size(EVP_PKEY *pkey);
- int EVP_PKEY_security_bits(const EVP_PKEY *pkey);
-
=head1 DESCRIPTION
The EVP signature routines are a high level interface to digital
same B<ctx> to include additional data.
EVP_SignFinal() signs the data in B<ctx> using the private key B<pkey> and
-places the signature in B<sig>. B<sig> must be at least EVP_PKEY_size(pkey)
+places the signature in B<sig>. B<sig> must be at least C<EVP_PKEY_size(pkey)>
bytes in size. B<s> is an OUT parameter, and not used as an IN parameter.
The number of bytes of data written (i.e. the length of the signature)
-will be written to the integer at B<s>, at most EVP_PKEY_size(pkey) bytes
+will be written to the integer at B<s>, at most C<EVP_PKEY_size(pkey)> bytes
will be written.
EVP_SignInit() initializes a signing context B<ctx> to use the default
implementation of digest B<type>.
-EVP_PKEY_size() returns the maximum size of a signature in bytes. The actual
-signature returned by EVP_SignFinal() may be smaller.
-
-EVP_PKEY_security_bits() returns the number of security bits of the given B<pkey>,
-bits of security is defined in NIST SP800-57.
-
=head1 RETURN VALUES
EVP_SignInit_ex(), EVP_SignUpdate() and EVP_SignFinal() return 1
for success and 0 for failure.
-EVP_PKEY_size() returns the maximum size of a signature in bytes.
-
The error codes can be obtained by L<ERR_get_error(3)>.
-EVP_PKEY_security_bits() returns the number of security bits.
-
=head1 NOTES
The B<EVP> interface to digital signatures should almost always be used in
preference to the low level interfaces. This is because the code then becomes
transparent to the algorithm used and much more flexible.
-When signing with DSA private keys the random number generator must be seeded
-or the operation will fail. The random number generator does not need to be
-seeded for RSA signatures.
+When signing with DSA private keys the random number generator must be seeded.
+If the automatic seeding or reseeding of the OpenSSL CSPRNG fails due to
+external circumstances (see L<RAND(7)>), the operation will fail.
+This requirement does not hold for RSA signatures.
The call to EVP_SignFinal() internally finalizes a copy of the digest context.
This means that calls to EVP_SignUpdate() and EVP_SignFinal() can be called
later to digest and sign additional data.
Since only a copy of the digest context is ever finalized the context must
-be cleaned up after use by calling EVP_MD_CTX_cleanup() or a memory leak
+be cleaned up after use by calling EVP_MD_CTX_free() or a memory leak
will occur.
=head1 BUGS
=head1 SEE ALSO
+L<EVP_PKEY_size(3)>, L<EVP_PKEY_bits(3)>, L<EVP_PKEY_security_bits(3)>,
L<EVP_VerifyInit(3)>,
L<EVP_DigestInit(3)>,
L<evp(7)>, L<HMAC(3)>, L<MD2(3)>,
L<MD5(3)>, L<MDC2(3)>, L<RIPEMD160(3)>,
-L<SHA1(3)>, L<dgst(1)>
+L<SHA1(3)>, L<openssl-dgst(1)>
=head1 COPYRIGHT
Copyright 2000-2018 The OpenSSL Project Authors. All Rights Reserved.
-Licensed under the OpenSSL license (the "License"). You may not use
+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>.
projects / openssl.git / blobdiff