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Diffstat (limited to 'static/openbsd/man3/EVP_DigestVerifyInit.3')
| -rw-r--r-- | static/openbsd/man3/EVP_DigestVerifyInit.3 | 224 |
1 files changed, 224 insertions, 0 deletions
diff --git a/static/openbsd/man3/EVP_DigestVerifyInit.3 b/static/openbsd/man3/EVP_DigestVerifyInit.3 new file mode 100644 index 00000000..3d40f8e9 --- /dev/null +++ b/static/openbsd/man3/EVP_DigestVerifyInit.3 @@ -0,0 +1,224 @@ +.\" $OpenBSD: EVP_DigestVerifyInit.3,v 1.18 2025/06/08 22:40:29 schwarze Exp $ +.\" full merge up to OpenSSL f097e875 Aug 23 11:37:22 2018 +0100 +.\" selective merge up to 24a535ea Sep 22 13:14:20 2020 +0100 +.\" +.\" This file was written by Dr. Stephen Henson <steve@openssl.org>. +.\" Copyright (c) 2006, 2009, 2014, 2015, 2016, 2017 The OpenSSL Project. +.\" All rights reserved. +.\" +.\" Redistribution and use in source and binary forms, with or without +.\" modification, are permitted provided that the following conditions +.\" are met: +.\" +.\" 1. Redistributions of source code must retain the above copyright +.\" notice, this list of conditions and the following disclaimer. +.\" +.\" 2. Redistributions in binary form must reproduce the above copyright +.\" notice, this list of conditions and the following disclaimer in +.\" the documentation and/or other materials provided with the +.\" distribution. +.\" +.\" 3. All advertising materials mentioning features or use of this +.\" software must display the following acknowledgment: +.\" "This product includes software developed by the OpenSSL Project +.\" for use in the OpenSSL Toolkit. (http://www.openssl.org/)" +.\" +.\" 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to +.\" endorse or promote products derived from this software without +.\" prior written permission. For written permission, please contact +.\" openssl-core@openssl.org. +.\" +.\" 5. Products derived from this software may not be called "OpenSSL" +.\" nor may "OpenSSL" appear in their names without prior written +.\" permission of the OpenSSL Project. +.\" +.\" 6. Redistributions of any form whatsoever must retain the following +.\" acknowledgment: +.\" "This product includes software developed by the OpenSSL Project +.\" for use in the OpenSSL Toolkit (http://www.openssl.org/)" +.\" +.\" THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY +.\" EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE +.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR +.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR +.\" ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +.\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT +.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; +.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, +.\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) +.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED +.\" OF THE POSSIBILITY OF SUCH DAMAGE. +.\" +.Dd $Mdocdate: June 8 2025 $ +.Dt EVP_DIGESTVERIFYINIT 3 +.Os +.Sh NAME +.Nm EVP_DigestVerifyInit , +.Nm EVP_DigestVerifyUpdate , +.Nm EVP_DigestVerifyFinal , +.Nm EVP_DigestVerify +.Nd EVP signature verification functions +.Sh SYNOPSIS +.Lb libcrypto +.In openssl/evp.h +.Ft int +.Fo EVP_DigestVerifyInit +.Fa "EVP_MD_CTX *ctx" +.Fa "EVP_PKEY_CTX **pctx" +.Fa "const EVP_MD *type" +.Fa "ENGINE *engine" +.Fa "EVP_PKEY *pkey" +.Fc +.Ft int +.Fo EVP_DigestVerifyUpdate +.Fa "EVP_MD_CTX *ctx" +.Fa "const void *d" +.Fa "size_t cnt" +.Fc +.Ft int +.Fo EVP_DigestVerifyFinal +.Fa "EVP_MD_CTX *ctx" +.Fa "const unsigned char *sig" +.Fa "size_t siglen" +.Fc +.Ft int +.Fo EVP_DigestVerify +.Fa "EVP_MD_CTX *ctx" +.Fa "const unsigned char *sig" +.Fa "size_t siglen" +.Fa "const unsigned char *tbs" +.Fa "size_t *tbslen" +.Fc +.Sh DESCRIPTION +The EVP signature routines are a high-level interface to digital +signatures. +.Pp +.Fn EVP_DigestVerifyInit +sets up the verification context +.Fa ctx +to use the digest +.Fa type +and the public key +.Fa pkey . +Before calling this function, obtain +.Fa ctx +from +.Xr EVP_MD_CTX_new 3 +or call +.Xr EVP_MD_CTX_reset 3 +on it. +The +.Fa engine +argument is always ignored and passing +.Dv NULL +is recommended. +.Pp +If +.Fa pctx +is not +.Dv NULL , +any pointer passed in as +.Pf * Fa pctx +is ignored and overwritten by an internal pointer to the +.Vt EVP_PKEY_CTX +used by the verification operation: +this can be used to set alternative signing options. +The returned +.Vt EVP_PKEY_CTX +must not be freed by the application. +It is freed automatically when the +.Vt EVP_MD_CTX +is freed. +.Pp +.Fn EVP_DigestVerifyUpdate +hashes +.Fa cnt +bytes of data at +.Fa d +into the verification context +.Fa ctx . +This function can be called several times on the same +.Fa ctx +to include additional data. +This function is currently implemented using a macro. +.Pp +.Fn EVP_DigestVerifyFinal +verifies the data in +.Fa ctx +against the signature in +.Fa sig +of length +.Fa siglen . +.Pp +.Fn EVP_DigestVerify +verifies +.Fa tbslen +bytes at +.Fa tbs +against the signature in +.Fa sig +of length +.Fa siglen . +.Fn EVP_DigestVerify +is a one shot operation which verifies a single block of data +in one function call. +For algorithms that support streaming it is equivalent to calling +.Fn EVP_DigestVerifyUpdate +and +.Fn EVP_DigestVerifyFinal . +.\" For algorithms which do not support streaming +.\" (e.g. PureEdDSA) +.\" it is the only way to verify data. +.Pp +The 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. +.Pp +The call to +.Fn EVP_DigestVerifyFinal +internally finalizes a copy of the digest context. +This means that +.Xr EVP_VerifyUpdate 3 +and +.Xr EVP_VerifyFinal 3 +can be called later to digest and verify additional data. +.Pp +Since only a copy of the digest context is ever finalized, the context +must be cleaned up after use by calling +.Xr EVP_MD_CTX_free 3 +or a memory leak will occur. +.Sh RETURN VALUES +.Fn EVP_DigestVerifyInit +and +.Fn EVP_DigestVerifyUpdate +return 1 for success and 0 for failure. +.Pp +.Fn EVP_DigestVerifyFinal +and +.Fn EVP_DigestVerify +return 1 for success; any other value indicates failure. +A return value of 0 indicates that the signature did not verify +successfully (that is, the signature did not match the original +data or the signature had an invalid form), while other values +indicate a more serious error (and sometimes also indicate an invalid +signature form). +.Pp +The error codes can be obtained from +.Xr ERR_get_error 3 . +.Sh SEE ALSO +.Xr evp 3 , +.Xr EVP_DigestInit 3 , +.Xr EVP_DigestSignInit 3 +.Sh HISTORY +.Fn EVP_DigestVerifyInit , +.Fn EVP_DigestVerifyUpdate , +and +.Fn EVP_DigestVerifyFinal +first appeared in OpenSSL 1.0.0 and have been available since +.Ox 4.9 . +.Pp +.Fn EVP_DigestVerify +first appeared in OpenSSL 1.1.1 and has been available since +.Ox 7.0 . |