Re: RSA read and write to and from file
From: "A. Konigsdorfer" <[EMAIL PROTECTED]> > > Would it be possible to use the i2d_RSAPublicKey(...) code the RSA > public key to DER and write the result out to a binary file? > > After that, d2i_RSAPrivateKey(...) could be used to restore the RSA > structure. I have never done that. I'm doing precisely that and it seems to work just fine. Cheers, Jim. IT Manager, Blitz The Net Ltd. __ OpenSSL Project http://www.openssl.org User Support Mailing List[EMAIL PROTECTED] Automated List Manager [EMAIL PROTECTED]
RE: RSA read and write to and from file
Title: RE: RSA read and write to and from file > If you have a private key in an RSA structure and just want > to write out > the public components then you can use > PEM_write_RSAPublicKey() and read > it in with PEM_read_RSAPublicKey(). The key read back will then just > contain the RSA public key components and naturally can't be used for > private key operations. > > The "EXPECTING PUBLIC KEY" message is telling you what the PEM routine > is expecting to see in the BEGIN and END lines of the PEM > file. If your > file doesn't have BEGIN PUBLIC KEY (as it wont) then you'll get the > error. Would it be possible to use the i2d_RSAPublicKey(...) code the RSA public key to DER and write the result out to a binary file? After that, d2i_RSAPrivateKey(...) could be used to restore the RSA structure. I have never done that. Kind regards, Armin
Re: RSA read and write to and from file
[EMAIL PROTECTED] wrote: > > Hi, > > I am having a problem with the RSA functions of the openssl package. > I want to generate an RSA key pair. Write them to disk and use them later > (this all in linux/AIX) > I managed to generate a keypair. But then the problem starts. I cant find > any functions to write the whole key (not just private of public) to disk. > When i write them seperately I cant read the public key in an rsa > structure. The function PEM_read_bio_PUBKEY() comes with the error > "EXPECTING PUBLIC KEY" But the file is a public key ?! > > Ive tried to strip the rsa.c and the genrsa.c but that didnt work for me. > I also looked at the examples but also these didnt provide me with the > right information. > > Can anybody supply me with an example of how to write an RSA key (encrypted > or not) to disk and read them in again to use it with RSA_public_encrypt(). > An RSA private key contains both the public and private components. You can use an RSA private key in an RSA structure for private and public operations. The private key is the "whole key". As such if you have the private key there's little point in writing the public key out to the same file, you're just duplicating information. If you have a private key in an RSA structure and just want to write out the public components then you can use PEM_write_RSAPublicKey() and read it in with PEM_read_RSAPublicKey(). The key read back will then just contain the RSA public key components and naturally can't be used for private key operations. The "EXPECTING PUBLIC KEY" message is telling you what the PEM routine is expecting to see in the BEGIN and END lines of the PEM file. If your file doesn't have BEGIN PUBLIC KEY (as it wont) then you'll get the error. Steve. -- Dr Stephen N. Henson. http://www.drh-consultancy.demon.co.uk/ Personal Email: [EMAIL PROTECTED] Senior crypto engineer, Celo Communications: http://www.celocom.com/ Core developer of the OpenSSL project: http://www.openssl.org/ Business Email: [EMAIL PROTECTED] PGP key: via homepage. __ OpenSSL Project http://www.openssl.org User Support Mailing List[EMAIL PROTECTED] Automated List Manager [EMAIL PROTECTED]
RSA read and write to and from file
Hi, I am having a problem with the RSA functions of the openssl package. I want to generate an RSA key pair. Write them to disk and use them later (this all in linux/AIX) I managed to generate a keypair. But then the problem starts. I can´t find any functions to write the whole key (not just private of public) to disk. When i write them seperately I can´t read the public key in an rsa structure. The function PEM_read_bio_PUBKEY() comes with the error "EXPECTING PUBLIC KEY" But the file is a public key ?! I´ve tried to strip the rsa.c and the genrsa.c but that didn´t work for me. I also looked at the examples but also these didn´t provide me with the right information. Can anybody supply me with an example of how to write an RSA key (encrypted or not) to disk and read them in again to use it with RSA_public_encrypt(). Met vriendelijke groet / With kind regards, Thijs Volders __ OpenSSL Project http://www.openssl.org User Support Mailing List[EMAIL PROTECTED] Automated List Manager [EMAIL PROTECTED]
