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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-15 19:43:11 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-15 19:43:11 +0000
commitfc22b3d6507c6745911b9dfcc68f1e665ae13dbc (patch)
treece1e3bce06471410239a6f41282e328770aa404a /upstream/debian-bookworm/man3/EVP_PKEY_verify.3ssl
parentInitial commit. (diff)
downloadmanpages-l10n-fc22b3d6507c6745911b9dfcc68f1e665ae13dbc.tar.xz
manpages-l10n-fc22b3d6507c6745911b9dfcc68f1e665ae13dbc.zip
Adding upstream version 4.22.0.upstream/4.22.0
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'upstream/debian-bookworm/man3/EVP_PKEY_verify.3ssl')
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+.\" ========================================================================
+.\"
+.IX Title "EVP_PKEY_VERIFY 3SSL"
+.TH EVP_PKEY_VERIFY 3SSL "2023-10-23" "3.0.11" "OpenSSL"
+.\" For nroff, turn off justification. Always turn off hyphenation; it makes
+.\" way too many mistakes in technical documents.
+.if n .ad l
+.nh
+.SH "NAME"
+EVP_PKEY_verify_init, EVP_PKEY_verify_init_ex, EVP_PKEY_verify
+\&\- signature verification using a public key algorithm
+.SH "SYNOPSIS"
+.IX Header "SYNOPSIS"
+.Vb 1
+\& #include <openssl/evp.h>
+\&
+\& int EVP_PKEY_verify_init(EVP_PKEY_CTX *ctx);
+\& int EVP_PKEY_verify_init_ex(EVP_PKEY_CTX *ctx, const OSSL_PARAM params[]);
+\& int EVP_PKEY_verify(EVP_PKEY_CTX *ctx,
+\& const unsigned char *sig, size_t siglen,
+\& const unsigned char *tbs, size_t tbslen);
+.Ve
+.SH "DESCRIPTION"
+.IX Header "DESCRIPTION"
+\&\fBEVP_PKEY_verify_init()\fR initializes a public key algorithm context \fIctx\fR for
+signing using the algorithm given when the context was created
+using \fBEVP_PKEY_CTX_new\fR\|(3) or variants thereof. The algorithm is used to
+fetch a \fB\s-1EVP_SIGNATURE\s0\fR method implicitly, see \*(L"Implicit fetch\*(R" in \fBprovider\fR\|(7)
+for more information about implicit fetches.
+.PP
+\&\fBEVP_PKEY_verify_init_ex()\fR is the same as \fBEVP_PKEY_verify_init()\fR but additionally
+sets the passed parameters \fIparams\fR on the context before returning.
+.PP
+The \fBEVP_PKEY_verify()\fR function performs a public key verification operation
+using \fIctx\fR. The signature is specified using the \fIsig\fR and
+\&\fIsiglen\fR parameters. The verified data (i.e. the data believed originally
+signed) is specified using the \fItbs\fR and \fItbslen\fR parameters.
+.SH "NOTES"
+.IX Header "NOTES"
+After the call to \fBEVP_PKEY_verify_init()\fR algorithm specific control
+operations can be performed to set any appropriate parameters for the
+operation.
+.PP
+The function \fBEVP_PKEY_verify()\fR can be called more than once on the same
+context if several operations are performed using the same parameters.
+.SH "RETURN VALUES"
+.IX Header "RETURN VALUES"
+\&\fBEVP_PKEY_verify_init()\fR and \fBEVP_PKEY_verify()\fR return 1 if the verification was
+successful and 0 if it failed. Unlike other functions the return value 0 from
+\&\fBEVP_PKEY_verify()\fR only indicates that the signature did not verify
+successfully (that is tbs did not match the original data or the signature was
+of invalid form) it is not an indication of a more serious error.
+.PP
+A negative value indicates an error other that signature verification failure.
+In particular a return value of \-2 indicates the operation is not supported by
+the public key algorithm.
+.SH "EXAMPLES"
+.IX Header "EXAMPLES"
+Verify signature using PKCS#1 and \s-1SHA256\s0 digest:
+.PP
+.Vb 2
+\& #include <openssl/evp.h>
+\& #include <openssl/rsa.h>
+\&
+\& EVP_PKEY_CTX *ctx;
+\& unsigned char *md, *sig;
+\& size_t mdlen, siglen;
+\& EVP_PKEY *verify_key;
+\&
+\& /*
+\& * NB: assumes verify_key, sig, siglen md and mdlen are already set up
+\& * and that verify_key is an RSA public key
+\& */
+\& ctx = EVP_PKEY_CTX_new(verify_key, NULL /* no engine */);
+\& if (!ctx)
+\& /* Error occurred */
+\& if (EVP_PKEY_verify_init(ctx) <= 0)
+\& /* Error */
+\& if (EVP_PKEY_CTX_set_rsa_padding(ctx, RSA_PKCS1_PADDING) <= 0)
+\& /* Error */
+\& if (EVP_PKEY_CTX_set_signature_md(ctx, EVP_sha256()) <= 0)
+\& /* Error */
+\&
+\& /* Perform operation */
+\& ret = EVP_PKEY_verify(ctx, sig, siglen, md, mdlen);
+\&
+\& /*
+\& * ret == 1 indicates success, 0 verify failure and < 0 for some
+\& * other error.
+\& */
+.Ve
+.SH "SEE ALSO"
+.IX Header "SEE ALSO"
+\&\fBEVP_PKEY_CTX_new\fR\|(3),
+\&\fBEVP_PKEY_encrypt\fR\|(3),
+\&\fBEVP_PKEY_decrypt\fR\|(3),
+\&\fBEVP_PKEY_sign\fR\|(3),
+\&\fBEVP_PKEY_verify_recover\fR\|(3),
+\&\fBEVP_PKEY_derive\fR\|(3)
+.SH "HISTORY"
+.IX Header "HISTORY"
+The \fBEVP_PKEY_verify_init()\fR and \fBEVP_PKEY_verify()\fR functions were added in
+OpenSSL 1.0.0.
+.PP
+The \fBEVP_PKEY_verify_init_ex()\fR function was added in OpenSSL 3.0.
+.SH "COPYRIGHT"
+.IX Header "COPYRIGHT"
+Copyright 2006\-2021 The OpenSSL Project Authors. All Rights Reserved.
+.PP
+Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use
+this file except in compliance with the License. You can obtain a copy
+in the file \s-1LICENSE\s0 in the source distribution or at
+<https://www.openssl.org/source/license.html>.