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go/src/crypto/rsa
Himanshu Kishna Srivastava 8f676144ad crypto/rsa: fix salt length calculation with PSSSaltLengthAuto
When PSSSaltLength is set, the maximum salt length must equal:

    (modulus_key_size - 1 + 7)/8 - hash_length - 2
and for example, with a 4096 bit modulus key, and a SHA-1 hash,
it should be:

     (4096 -1 + 7)/8 - 20 - 2 = 490
Previously we'd encounter this error:

     crypto/rsa: key size too small for PSS signature

Fixes #42741

Change-Id: I18bb82c41c511d564b3f4c443f4b3a38ab010ac5
Reviewed-on: https://go-review.googlesource.com/c/go/+/302230
Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Trust: Emmanuel Odeke <emmanuel@orijtech.com>
Run-TryBot: Emmanuel Odeke <emmanuel@orijtech.com>
TryBot-Result: Go Bot <gobot@golang.org>
2021-03-29 15:20:11 +00:00
..
testdata
equal_test.go
example_test.go
pkcs1v15_test.go
pkcs1v15.go
pss_test.go
pss.go
rsa_test.go
rsa.go