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Re: SecKeyGeneratePair export Public Key and OpenSSL API

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Re: SecKeyGeneratePair export Public Key and OpenSSL API

Subject: Re: SecKeyGeneratePair export Public Key and OpenSSL API
From: Jacopo Mangiavacchi <email@hidden>
Date: Wed, 5 Nov 2008 12:41:57 +0100

Some more info.

I obtained a persistence reference of an auto generated Public key calling the SecItemCopyMatching then I encoded it in base64 format. After that I added the strings "---- BEGIN..." at the top and "---- END..." at the bottom obtaining this final string an save it on a file:

Than if I try this command: openssl rsa -pubin -in iphonepubkey.pem - modulus -noout I obtain this following error:

unable to load Public Key 22483:error:0D0680A8:asn1 encoding routines:ASN1_CHECK_TLEN:wrong tag:tasn_dec.c:1007: 22483:error:0D07803A:asn1 encoding routines:ASN1_ITEM_EX_D2I:nested asn1 error:tasn_dec.c:305:Type=X509_ALGOR 22483:error:0D08303A:asn1 encoding routines:ASN1_TEMPLATE_D2I:nested asn1 error:tasn_dec.c:567:Field=algor, Type=X509_PUBKEY 22483:error:0906700D:PEM routines:PEM_ASN1_read_bio:ASN1 lib:pem_oth.c: 82:

Btw, if I generate the key pair using the OpenSSL API the output of the last command instead is correct (Modulus=B744103A06A...)

I really can't understand where is my fault, I double checked the parameter that I pass to SecItemCopyMatching and SecKeyGeneratePair and of course the public key is valid by itself. I'm able to decrypt etc. with it.

From: Jacopo Mangiavacchi <email@hidden>
Subject: SecKeyGeneratePair export Public Key and OpenSSL API
To: email@hidden, email@hidden
Message-ID: <email@hidden>
Content-Type: text/plain; charset="us-ascii"

I need to export a public key generated with the SecKeyGeneratePair
API and send it to a WebServices (written in PHP) that using the
OpenSSL API must encrypt something using this key and return back the
ciphered value to the cocoa client.

In order to pass the public key NSData buffer I've tried to encode
that in Base64 format and to pass it as a standard RSA pubkey string
because I know that OpenSSL can accept a string like that.

An example of this kind of string is the following:


Any way, the OpenSSL is telling me that this is not a valid public
key.  Btw, an OpenSSL auto-generated public key is a little bit longer
than this, like the following for eample:


Am I missing something ?

Thanks for any help,
jacopo


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