flutter / third_party / openssl / 4b1b629725970384d6cf4dafe9e83e54859574cd / . / doc / man3 / RSA_sign.pod

=pod | |

=head1 NAME | |

RSA_sign, RSA_verify - RSA signatures | |

=head1 SYNOPSIS | |

#include <openssl/rsa.h> | |

The following functions have been deprecated since OpenSSL 3.0, and can be | |

hidden entirely by defining B<OPENSSL_API_COMPAT> with a suitable version value, | |

see L<openssl_user_macros(7)>: | |

int RSA_sign(int type, const unsigned char *m, unsigned int m_len, | |

unsigned char *sigret, unsigned int *siglen, RSA *rsa); | |

int RSA_verify(int type, const unsigned char *m, unsigned int m_len, | |

unsigned char *sigbuf, unsigned int siglen, RSA *rsa); | |

=head1 DESCRIPTION | |

All of the functions described on this page are deprecated. | |

Applications should instead use L<EVP_PKEY_sign_init(3)>, L<EVP_PKEY_sign(3)>, | |

L<EVP_PKEY_verify_init(3)> and L<EVP_PKEY_verify(3)>. | |

RSA_sign() signs the message digest B<m> of size B<m_len> using the | |

private key B<rsa> using RSASSA-PKCS1-v1_5 as specified in RFC 3447. It | |

stores the signature in B<sigret> and the signature size in B<siglen>. | |

B<sigret> must point to RSA_size(B<rsa>) bytes of memory. | |

Note that PKCS #1 adds meta-data, placing limits on the size of the | |

key that can be used. | |

See L<RSA_private_encrypt(3)> for lower-level | |

operations. | |

B<type> denotes the message digest algorithm that was used to generate | |

B<m>. | |

If B<type> is B<NID_md5_sha1>, | |

an SSL signature (MD5 and SHA1 message digests with PKCS #1 padding | |

and no algorithm identifier) is created. | |

RSA_verify() verifies that the signature B<sigbuf> of size B<siglen> | |

matches a given message digest B<m> of size B<m_len>. B<type> denotes | |

the message digest algorithm that was used to generate the signature. | |

B<rsa> is the signer's public key. | |

=head1 RETURN VALUES | |

RSA_sign() returns 1 on success. | |

RSA_verify() returns 1 on successful verification. | |

The error codes can be obtained by L<ERR_get_error(3)>. | |

=head1 CONFORMING TO | |

SSL, PKCS #1 v2.0 | |

=head1 SEE ALSO | |

L<ERR_get_error(3)>, | |

L<RSA_private_encrypt(3)>, | |

L<RSA_public_decrypt(3)> | |

=head1 HISTORY | |

All of these functions were deprecated in OpenSSL 3.0. | |

=head1 COPYRIGHT | |

Copyright 2000-2020 The OpenSSL Project Authors. All Rights Reserved. | |

Licensed under the Apache License 2.0 (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 | |

L<https://www.openssl.org/source/license.html>. | |

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