RSA_SIGN_ASN1_OCTET_STRING

Section: OpenSSL (3)
Updated: 2021-03-26
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NAME

RSA_sign_ASN1_OCTET_STRING, RSA_verify_ASN1_OCTET_STRING - RSA signatures

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.

COPYRIGHT

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>.