[15] RFR 8238448: RSASSA-PSS signature verification fail when using certain odd key sizes

Xuelei Fan xuelei.fan at oracle.com
Fri Feb 7 06:14:30 UTC 2020


On 2/6/2020 7:02 PM, Valerie Peng wrote:
> Anyone can help reviewing this?
> 
> There is a bug in RSASSA-PSS signature verification when the key size is 
> multiples of 8 plus 1 bit. The verification on the encoded message is 
> off by one and verification failed unexpectedly. I added a check and 
> adjusted the starting index for the verification. I added 1025 and 2049 
> to existing PSS tests to verify this fix.
> 
Hm, is there really use of 1025/2049 bits RSA key in practice.  But it's 
a nice catch!

> Bug: https://bugs.openjdk.java.net/browse/JDK-8238448
> 
> Webrev: http://cr.openjdk.java.net/~valeriep/8238448/webrev.00/
> 
It looks good to me.

Xuelei

> Mach5 run is clean.
> 
> Thanks,
> Valerie


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