=head1 NAME
-EVP_DigestVerifyInit, EVP_DigestVerifyUpdate, EVP_DigestVerifyFinal,
-EVP_DigestVerify - EVP signature verification functions
+EVP_DigestVerifyInit_ex, EVP_DigestVerifyInit, EVP_DigestVerifyUpdate,
+EVP_DigestVerifyFinal, EVP_DigestVerify - EVP signature verification functions
=head1 SYNOPSIS
#include <openssl/evp.h>
+ int EVP_DigestVerifyInit_ex(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
+ const char *mdname, const char *props,
+ EVP_PKEY *pkey, OPENSSL_CTX *libctx);
int EVP_DigestVerifyInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
- const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey);
+ const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey);
int EVP_DigestVerifyUpdate(EVP_MD_CTX *ctx, const void *d, size_t cnt);
int EVP_DigestVerifyFinal(EVP_MD_CTX *ctx, const unsigned char *sig,
size_t siglen);
=head1 DESCRIPTION
The EVP signature routines are a high level interface to digital signatures.
+Input data is digested first before the signature verification takes place.
-EVP_DigestVerifyInit() sets up verification context B<ctx> to use digest
-B<type> from ENGINE B<impl> and public key B<pkey>. B<ctx> must be created
-with EVP_MD_CTX_new() before calling this function. If B<pctx> is not NULL the
-EVP_PKEY_CTX of the verification operation will be written to B<*pctx>: this
-can be used to set alternative verification options.
+EVP_DigestVerifyInit_ex() sets up verification context B<ctx> to use a digest
+with the name B<mdname> and public key B<pkey>. The name of the digest to be
+used is passed to the provider of the signature algorithm in use. How that
+provider interprets the digest name is provider specific. The provider may
+implement that digest directly itself or it may (optionally) choose to fetch it
+(which could result in a digest from a different provider being selected). If
+the provider supports fetching the digest then it may use the B<props> argument
+for the properties to be used during the fetch.
+
+The I<pkey> algorithm is used to fetch a B<EVP_SIGNATURE> method implicitly, to
+be used for the actual signing. See L<provider(7)/Implicit fetch> for
+more information about implict fetches.
+
+The OpenSSL default and legacy providers support fetching digests and can fetch
+those digests from any available provider. The OpenSSL fips provider also
+supports fetching digests but will only fetch digests that are themselves
+implemented inside the fips provider.
+
+B<ctx> must be created with EVP_MD_CTX_new() before calling this function. If
+B<pctx> is not NULL, the EVP_PKEY_CTX of the verification operation will be
+written to B<*pctx>: this can be used to set alternative verification options.
+Note that any existing value in B<*pctx> is overwritten. The EVP_PKEY_CTX value
+returned must not be freed directly by the application if B<ctx> is not assigned
+an EVP_PKEY_CTX value before being passed to EVP_DigestVerifyInit_ex() (which
+means the EVP_PKEY_CTX is created inside EVP_DigestVerifyInit_ex() and it will
+be freed automatically when the EVP_MD_CTX is freed). If the EVP_PKEY_CTX to be
+used is created by EVP_DigestVerifyInit_ex then it will use the B<OPENSSL_CTX>
+specified in I<libctx> and the property query string specified in I<props>.
+
+No B<EVP_PKEY_CTX> will be created by EVP_DigestSignInit_ex() if the passed
+B<ctx> has already been assigned one via L<EVP_MD_CTX_set_pkey_ctx(3)>. See also
+L<SM2(7)>.
+
+Not all digests can be used for all key types. The following combinations apply.
+
+=over 4
+
+=item DSA
+
+Supports SHA1, SHA224, SHA256, SHA384 and SHA512
+
+=item ECDSA
+
+Supports SHA1, SHA224, SHA256, SHA384, SHA512 and SM3
+
+=item RSA with no padding
+
+Supports no digests (the digest B<type> must be NULL)
+
+=item RSA with X931 padding
+
+Supports SHA1, SHA256, SHA384 and SHA512
+
+=item All other RSA padding types
+
+Support SHA1, SHA224, SHA256, SHA384, SHA512, MD5, MD5_SHA1, MD2, MD4, MDC2,
+SHA3-224, SHA3-256, SHA3-384, SHA3-512
+
+=item Ed25519 and Ed448
+
+Support no digests (the digest B<type> must be NULL)
+
+=item HMAC
+
+Supports any digest
+
+=item CMAC, Poly1305 and SipHash
+
+Will ignore any digest provided.
+
+=back
+
+If RSA-PSS is used and restrictions apply then the digest must match.
+
+EVP_DigestVerifyInit() works in the same way as EVP_DigestVerifyInit_ex() except
+that the B<mdname> parameter will be inferred from the supplied digest B<type>,
+and B<props> will be NULL. Where supplied the ENGINE B<e> will be used for the
+signature verification and digest algorithm implementations. B<e> may be NULL.
EVP_DigestVerifyUpdate() hashes B<cnt> bytes of data at B<d> into the
verification context B<ctx>. This function can be called several times on the
-same B<ctx> to include additional data. This function is currently implemented
-using a macro.
+same B<ctx> to include additional data.
EVP_DigestVerifyFinal() verifies the data in B<ctx> against the signature in
B<sig> of length B<siglen>.
-EVP_DogestVerify() verifies B<tbslen> bytes at B<tbs> against the signature
+EVP_DigestVerify() verifies B<tbslen> bytes at B<tbs> against the signature
in B<sig> of length B<siglen>.
=head1 RETURN VALUES
preference to the low level interfaces. This is because the code then becomes
transparent to the algorithm used and much more flexible.
-EVP_DigesVerify() is a one shot operation which verifies a single block of
+EVP_DigestVerify() is a one shot operation which verifies a single block of
data in one function. For algorithms that support streaming it is equivalent
to calling EVP_DigestVerifyUpdate() and EVP_DigestVerifyFinal(). For
algorithms which do not support streaming (e.g. PureEdDSA) it is the only way
needed to be used to sign using SHA1 and DSA. This is no longer necessary and
the use of clone digest is now discouraged.
-For some key types and parameters the random number generator must be seeded
-or the operation will fail.
+For some key types and parameters 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.
The call to EVP_DigestVerifyFinal() internally finalizes a copy of the digest
context. This means that EVP_VerifyUpdate() and EVP_VerifyFinal() can
be called later to digest and verify 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
+Since only a copy of the digest context is ever finalized, the context must
+be cleaned up after use by calling EVP_MD_CTX_free() or a memory leak
will occur.
=head1 SEE ALSO
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)>,
+L<RAND(7)>
=head1 HISTORY
EVP_DigestVerifyInit(), EVP_DigestVerifyUpdate() and EVP_DigestVerifyFinal()
-were first added to OpenSSL 1.0.0.
+were added in OpenSSL 1.0.0.
+
+EVP_DigestVerifyInit_ex() was added in OpenSSL 3.0.
+
+EVP_DigestVerifyUpdate() was converted from a macro to a function in OpenSSL
+3.0.
=head1 COPYRIGHT
-Copyright 2006-2017 The OpenSSL Project Authors. All Rights Reserved.
+Copyright 2006-2018 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>.
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