Re: Converting ECC public key point-compressed and uncompressed
I am able to convert the ECC key from compressed to uncompressed (and vice versa) using the EC_KEY_set_conv_form call . On Sun, Jul 17, 2011 at 10:30 AM, Erwin Himawan ehima...@gmail.com wrote: Marti, thanks for your response. Erwin --** From: Martin Boßlet martin.boss...@googlemail.com** Sent: Sunday, July 17, 2011 7:21 AM To: openssl-users@openssl.org Subject: Re: Converting ECC public key point-compressed and uncompressed My understanding is that to convert the form of ecc key from compressed to uncompressed and from uncompressed to compressed require the knowledge of the ECC private key. Is my understanding correct? You might want to have a look at sections 2.3.3 and 2.3.4 in http://www.secg.org/download/**aid-780/sec1-v2.pdfhttp://www.secg.org/download/aid-780/sec1-v2.pdf No knowledge of the private key is needed. Regards, Martin __**__** __ OpenSSL Project http://www.openssl.org User Support Mailing Listopenssl-users@openssl.org Automated List Manager majord...@openssl.org
Re: Converting ECC public key point-compressed and uncompressed
I did dig arround more on the ecparam and ec options. Having a limited knowledge on cryptograpy and specifically ecc key algorithm, and experimenting with the CLI, I would like to clarify my understanding on coverting the form of ecc key from compressed to uncompressed and vice versa. My understanding is that to convert the form of ecc key from compressed to uncompressed and from uncompressed to compressed require the knowledge of the ECC private key. Is my understanding correct? Thanks in advance Erwin On Fri, Jul 15, 2011 at 9:06 PM, Erwin Himawan ehima...@gmail.com wrote: Hi All, I would like to know whether openssl API has function call for generating ECC point-compression given that only the uncompressed ECC public key. Likewise, given the point-compressed ECC Key, I would also like to recover the uncompressed ECC key. Thanks for the help Regards, Erwin
Re: Converting ECC public key point-compressed and uncompressed
My understanding is that to convert the form of ecc key from compressed to uncompressed and from uncompressed to compressed require the knowledge of the ECC private key. Is my understanding correct? You might want to have a look at sections 2.3.3 and 2.3.4 in http://www.secg.org/download/aid-780/sec1-v2.pdf No knowledge of the private key is needed. Regards, Martin __ OpenSSL Project http://www.openssl.org User Support Mailing Listopenssl-users@openssl.org Automated List Manager majord...@openssl.org
Re: Converting ECC public key point-compressed and uncompressed
Marti, thanks for your response. Erwin -- From: Martin Boßlet martin.boss...@googlemail.com Sent: Sunday, July 17, 2011 7:21 AM To: openssl-users@openssl.org Subject: Re: Converting ECC public key point-compressed and uncompressed My understanding is that to convert the form of ecc key from compressed to uncompressed and from uncompressed to compressed require the knowledge of the ECC private key. Is my understanding correct? You might want to have a look at sections 2.3.3 and 2.3.4 in http://www.secg.org/download/aid-780/sec1-v2.pdf No knowledge of the private key is needed. Regards, Martin __ OpenSSL Project http://www.openssl.org User Support Mailing Listopenssl-users@openssl.org Automated List Manager majord...@openssl.org __ OpenSSL Project http://www.openssl.org User Support Mailing Listopenssl-users@openssl.org Automated List Manager majord...@openssl.org
Converting ECC public key point-compressed and uncompressed
Hi All, I would like to know whether openssl API has function call for generating ECC point-compression given that only the uncompressed ECC public key. Likewise, given the point-compressed ECC Key, I would also like to recover the uncompressed ECC key. Thanks for the help Regards, Erwin
