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.\" ========================================================================
.\"
.IX Title "RSA_SIGN_ASN1_OCTET_STRING 3ossl"
.TH RSA_SIGN_ASN1_OCTET_STRING 3ossl "2023-09-19" "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"
RSA_sign_ASN1_OCTET_STRING, RSA_verify_ASN1_OCTET_STRING \- RSA signatures
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/rsa.h>
.Ve
.PP
The following functions have been deprecated since OpenSSL 3.0, and can be
hidden entirely by defining \fB\s-1OPENSSL_API_COMPAT\s0\fR with a suitable version value,
see \fBopenssl_user_macros\fR\|(7):
.PP
.Vb 3
\& int RSA_sign_ASN1_OCTET_STRING(int dummy, unsigned char *m,
\& unsigned int m_len, unsigned char *sigret,
\& unsigned int *siglen, RSA *rsa);
\&
\& int RSA_verify_ASN1_OCTET_STRING(int dummy, unsigned char *m,
\& unsigned int m_len, unsigned char *sigbuf,
\& unsigned int siglen, RSA *rsa);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
All of the functions described on this page are deprecated.
Applications should instead use \s-1EVP PKEY\s0 APIs.
.PP
\&\fBRSA_sign_ASN1_OCTET_STRING()\fR signs the octet string \fBm\fR of size
\&\fBm_len\fR using the private key \fBrsa\fR represented in \s-1DER\s0 using \s-1PKCS\s0 #1
padding. It stores the signature in \fBsigret\fR and the signature size
in \fBsiglen\fR. \fBsigret\fR must point to \fBRSA_size(rsa)\fR bytes of
memory.
.PP
\&\fBdummy\fR is ignored.
.PP
The random number generator must be seeded when calling
\&\fBRSA_sign_ASN1_OCTET_STRING()\fR.
If the automatic seeding or reseeding of the OpenSSL \s-1CSPRNG\s0 fails due to
external circumstances (see \s-1\fBRAND\s0\fR\|(7)), the operation will fail.
.PP
\&\fBRSA_verify_ASN1_OCTET_STRING()\fR verifies that the signature \fBsigbuf\fR
of size \fBsiglen\fR is the \s-1DER\s0 representation of a given octet string
\&\fBm\fR of size \fBm_len\fR. \fBdummy\fR is ignored. \fBrsa\fR is the signer's
public key.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBRSA_sign_ASN1_OCTET_STRING()\fR returns 1 on success, 0 otherwise.
\&\fBRSA_verify_ASN1_OCTET_STRING()\fR returns 1 on successful verification, 0
otherwise.
.PP
The error codes can be obtained by \fBERR_get_error\fR\|(3).
.SH "BUGS"
.IX Header "BUGS"
These functions serve no recognizable purpose.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBERR_get_error\fR\|(3),
\&\fBRAND_bytes\fR\|(3), \fBRSA_sign\fR\|(3),
\&\fBRSA_verify\fR\|(3),
\&\s-1\fBRAND\s0\fR\|(7)
.SH "HISTORY"
.IX Header "HISTORY"
All of these functions were deprecated in OpenSSL 3.0.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2000\-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>.
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