When calling the decoder, the selection bits don't have an absolute meaning, i.e. all bits set doesn't mean "you MUST give a private key". They're more like a wish list of parts, and it's up to the decoder to make good enough sense of it. So, if a decoder that handles the structure SubjectPublicKeyInfo sees all selector bits set, and the input is, in fact, a SubjectPublicKeyInfo structure, then it should produce keydata with the public parts, and pass that on.
libcrypto will figure out if the loaded key corresponds to what was actually asked for...
So if your decoder signals an error if the private bits couldn't be found, just because the selector bits had PRIV set, then your decoder is a bit too strict to be useful.
Cheers,
Richard
On Tue, Sep 3, 2024 at 11:54 AM 'Bernd Ritter' via openssl-users <openssl-users@xxxxxxxxxxx> wrote:
Hey everyone,
still wondering, why OpenSSL wants to access the private key for
verification. Does this have to do with the (missing) store
implementation? But the private key is there and can be used for signing
the payload.
ed25519ph-provider/src/ed25519ph_decoder.c - Decoder pem does selection
for private key: 0x87, sel=0x87: PRIV (0x01) PUB (0x02) DOM (0x04) OTH
(0x80)
Could not find private key of public key from example-pub.pem
806BCE259D770000:error:1608010C:STORE
routines:ossl_store_handle_load_result:unsupported:crypto/store/store_result.c:151:
806BCE259D770000:error:1608010C:STORE
routines:ossl_store_handle_load_result:unsupported:crypto/store/store_result.c:151:
Hoping for some insights,
Bernd
Am 27.08.24 um 09:30 schrieb 'Bernd Ritter' via openssl-users:
> Hey everyone,
>
> I am still struggling on this. My lead was to check if the public key
> was somehow incorrect. But both the ed25519 and my own X509_PUBKEY look
> quite similar:
>
> # openssl asn1parse -in example-pub.ed25519.pem
> 0:d=0 hl=2 l= 42 cons: SEQUENCE
> 2:d=1 hl=2 l= 5 cons: SEQUENCE
> 4:d=2 hl=2 l= 3 prim: OBJECT :ED25519
> 9:d=1 hl=2 l= 33 prim: BIT STRING
>
> # openssl asn1parse -in example-pub.pem
> 0:d=0 hl=2 l= 42 cons: SEQUENCE
> 2:d=1 hl=2 l= 5 cons: SEQUENCE
> 4:d=2 hl=2 l= 3 prim: OBJECT :1.2.3.4
> 9:d=1 hl=2 l= 33 prim: BIT STRING
>
> Besides that, given the logs below the provider does not seem to load my
> own decoder to read the public key file. But I have no idea which that
> might be.
>
> Hoping for some ideas.
>
> All the best,
> Bernd
>
> Am 19.08.24 um 11:51 schrieb 'Bernd Ritter' via openssl-users:
>> Hello everyone,
>>
>> I want to verify a signature from a message with my custom provider.
>> Generating the private and public key works, I get to create the
>> custom oid'd keys example.pem and example-pub.pem as files.
>>
>> Creating the signature from a text file also works.
>>
>> Then I naturally want to verify the message against the signature.
>> Here I get this:
>>
>> openssl pkeyutl -provider-path build -provider default -provider
>> ed25519ph -propquery ?provider=myprovider -verify -inkey
>> example-pub.pem -pubin -in message.txt -rawin -sigfile message.txt.sigp
>>
>> ed25519ph provider init...
>> ed25519ph provider init complete
>> operating switch: 22 (1=DIGEST, 2=CIPHER, 5=RAND, 10=KEYMGMT, 12=SIG,
>> 20=ENC, 21=DEC, 22=STOR), 0x595220dedc90
>> operating switch: 21 (1=DIGEST, 2=CIPHER, 5=RAND, 10=KEYMGMT, 12=SIG,
>> 20=ENC, 21=DEC, 22=STOR), 0x595220dedc90
>> operating switch: 10 (1=DIGEST, 2=CIPHER, 5=RAND, 10=KEYMGMT, 12=SIG,
>> 20=ENC, 21=DEC, 22=STOR), 0x595220dedc90
>> operating switch: 21 (1=DIGEST, 2=CIPHER, 5=RAND, 10=KEYMGMT, 12=SIG,
>> 20=ENC, 21=DEC, 22=STOR), 0x595220dedc90
>> provider/src/ed25519ph_decoder.c - Decoder context new 0x595220e02d90
>> provider/src/ed25519ph_decoder.c - Decoder context new 0x595220e02de0
>> operating switch: 21 (1=DIGEST, 2=CIPHER, 5=RAND, 10=KEYMGMT, 12=SIG,
>> 20=ENC, 21=DEC, 22=STOR), 0x595220dedc90
>> provider/src/ed25519ph_decoder.c - Decoder context new 0x595220e04630
>> provider/src/ed25519ph_decoder.c - Decoder context new 0x595220e04680
>> provider/src/ed25519ph_decoder.c - Decoder context free 0x595220e04630
>> provider/src/ed25519ph_decoder.c - Decoder context free 0x595220e04680
>> operating switch: 10 (1=DIGEST, 2=CIPHER, 5=RAND, 10=KEYMGMT, 12=SIG,
>> 20=ENC, 21=DEC, 22=STOR), 0x595220dedc90
>> operating switch: 21 (1=DIGEST, 2=CIPHER, 5=RAND, 10=KEYMGMT, 12=SIG,
>> 20=ENC, 21=DEC, 22=STOR), 0x595220dedc90
>> operating switch: 10 (1=DIGEST, 2=CIPHER, 5=RAND, 10=KEYMGMT, 12=SIG,
>> 20=ENC, 21=DEC, 22=STOR), 0x595220dedc90
>> operating switch: 21 (1=DIGEST, 2=CIPHER, 5=RAND, 10=KEYMGMT, 12=SIG,
>> 20=ENC, 21=DEC, 22=STOR), 0x595220dedc90
>> operating switch: 21 (1=DIGEST, 2=CIPHER, 5=RAND, 10=KEYMGMT, 12=SIG,
>> 20=ENC, 21=DEC, 22=STOR), 0x595220dedc90
>> operating switch: 10 (1=DIGEST, 2=CIPHER, 5=RAND, 10=KEYMGMT, 12=SIG,
>> 20=ENC, 21=DEC, 22=STOR), 0x595220dedc90
>> operating switch: 21 (1=DIGEST, 2=CIPHER, 5=RAND, 10=KEYMGMT, 12=SIG,
>> 20=ENC, 21=DEC, 22=STOR), 0x595220dedc90
>> provider/src/ed25519ph_decoder.c - Decoder context new 0x595220dfc6f0
>> provider/src/ed25519ph_decoder.c - Decoder context new 0x595220e07310
>> operating switch: 21 (1=DIGEST, 2=CIPHER, 5=RAND, 10=KEYMGMT, 12=SIG,
>> 20=ENC, 21=DEC, 22=STOR), 0x595220dedc90
>> provider/src/ed25519ph_decoder.c - Decoder context new 0x595220e092d0
>> provider/src/ed25519ph_decoder.c - Decoder context new 0x595220e09320
>> provider/src/ed25519ph_decoder.c - Decoder context free 0x595220e092d0
>> provider/src/ed25519ph_decoder.c - Decoder context free 0x595220e09320
>> operating switch: 10 (1=DIGEST, 2=CIPHER, 5=RAND, 10=KEYMGMT, 12=SIG,
>> 20=ENC, 21=DEC, 22=STOR), 0x595220dedc90
>> operating switch: 21 (1=DIGEST, 2=CIPHER, 5=RAND, 10=KEYMGMT, 12=SIG,
>> 20=ENC, 21=DEC, 22=STOR), 0x595220dedc90
>> Could not find private key of public key from example-pub.pem
>> 800BFD680F7A0000:error:1608010C:STORE
>> routines:ossl_store_handle_load_result:unsupported:crypto/store/store_result.c:151:
>> 800BFD680F7A0000:error:1608010C:STORE
>> routines:ossl_store_handle_load_result:unsupported:crypto/store/store_result.c:151:
>> pkeyutl: Error initializing context
>>
>> Why does OpenSSL look for the private key in the public key file? The
>> same command using ed25519 and ed25519ph (as pkeyopt) work just fine.
>>
>> All the best,
>> Bernd
>>
>
--
Bernd Ritter
Senior Linux Developer
Tel.: +49 175 534 4534
Mail: ritter@xxxxxxxxxxxxx
B1 Systems GmbH
Osterfeldstraße 7 / 85088 Vohburg / http://www.b1-systems.de
GF: Ralph Dehner / Unternehmenssitz: Vohburg / AG: Ingolstadt, HRB 3537
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