Updated: 2021/Apr/14


RSA_sign_ASN1_OCTET_STRING(3)       OpenSSL      RSA_sign_ASN1_OCTET_STRING(3)



NAME
       RSA_sign_ASN1_OCTET_STRING, RSA_verify_ASN1_OCTET_STRING - RSA
       signatures

LIBRARY
       libcrypto, -lcrypto

SYNOPSIS
        #include <openssl/rsa.h>

        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);

DESCRIPTION
       RSA_sign_ASN1_OCTET_STRING() signs the octet string m of size m_len
       using the private key rsa represented in DER using PKCS #1 padding. It
       stores the signature in sigret and the signature size in siglen. sigret
       must point to RSA_size(rsa) bytes of memory.

       dummy is ignored.

       The random number generator must be seeded when calling
       RSA_sign_ASN1_OCTET_STRING().  If the automatic seeding or reseeding of
       the OpenSSL CSPRNG fails due to external circumstances (see RAND(7)),
       the operation will fail.

       RSA_verify_ASN1_OCTET_STRING() verifies that the signature sigbuf of
       size siglen is the DER representation of a given octet string m of size
       m_len. dummy is ignored. rsa is the signer's public key.

RETURN VALUES
       RSA_sign_ASN1_OCTET_STRING() returns 1 on success, 0 otherwise.
       RSA_verify_ASN1_OCTET_STRING() returns 1 on successful verification, 0
       otherwise.

       The error codes can be obtained by ERR_get_error(3).

BUGS
       These functions serve no recognizable purpose.

SEE ALSO
       ERR_get_error(3), RAND_bytes(3), RSA_sign(3), RSA_verify(3), RAND(7)

COPYRIGHT
       Copyright 2000-2019 The OpenSSL Project Authors. All Rights Reserved.

       Licensed under the OpenSSL license (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
       <https://www.openssl.org/source/license.html>.



1.1.1i                            2020-01-23     RSA_sign_ASN1_OCTET_STRING(3)