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);
- int EVP_DigestVerify(EVP_MD_CTX *ctx, const unsigned char *sigret,
+ int EVP_DigestVerify(EVP_MD_CTX *ctx, const unsigned char *sig,
size_t siglen, const unsigned char *tbs, size_t tbslen);
=head1 DESCRIPTION
more information about implicit fetches.
The OpenSSL default and legacy providers support fetching digests and can fetch
-those digests from any available provider. The OpenSSL fips provider also
+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.
+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
EVP_DigestVerifyInit_ex then it will use the B<OSSL_LIB_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
+No B<EVP_PKEY_CTX> will be created by EVP_DigestVerifyInit_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)>.
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.
+be called later to digest and verify additional data. Applications may disable
+this behavior by setting the EVP_MD_CTX_FLAG_FINALISE context flag via
+L<EVP_MD_CTX_set_flags(3)>.
-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.
+Note that not all providers support continuation, in case the selected
+provider does not allow to duplicate contexts EVP_DigestVerifyFinal() will
+finalize the digest context and attempting to process additional data via
+EVP_DigestVerifyUpdate() will result in an error.
+
+EVP_DigestVerifyInit() and EVP_DigestVerifyInit_ex() functions can be called
+multiple times on a context and the parameters set by previous calls should be
+preserved if the I<pkey> parameter is NULL. The call then just resets the state
+of the I<ctx>.
+
+EVP_DigestVerify() can only be called once, and cannot be used again without
+reinitialising the B<EVP_MD_CTX> by calling EVP_DigestVerifyInit_ex().
+
+Ignoring failure returns of EVP_DigestVerifyInit() and EVP_DigestVerifyInit_ex()
+functions can lead to subsequent undefined behavior when calling
+EVP_DigestVerifyUpdate(), EVP_DigestVerifyFinal(), or EVP_DigestVerify().
=head1 SEE ALSO
=head1 COPYRIGHT
-Copyright 2006-2020 The OpenSSL Project Authors. All Rights Reserved.
+Copyright 2006-2023 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