Where possible, functions should return one for success and zero for
error. The use of additional negative values to indicate an error is,
itself, error prone.
This change fixes many EVP functions to remove the possibility of
negative return values. Existing code that is testing for <= 0 will
continue to function, although there is the possibility that some code
was differentiating between negative values (error) and zero (invalid
signature) for the verify functions and will now show the wrong error
message.
Change-Id: I982512596bb18a82df65861394dbd7487783bd3d
Reviewed-on: https://boringssl-review.googlesource.com/1333
Reviewed-by: Adam Langley <agl@google.com>
It's unused with SSLv2 gone. Also, being a decryption padding check, it really
should be constant-time and isn't.
Change-Id: I96be02cb50f9bf0229b9174eccd80fa338bf8e3e
Reviewed-on: https://boringssl-review.googlesource.com/1254
Reviewed-by: Adam Langley <agl@google.com>
Converting check_autoarg from a macro to a function lost the behavior. Instead,
just move the logic into p_rsa.c which was the only EVP_PKEY implementation
that even needed the flag.
Also document this behavior on each of the functions. Make note of the out =
NULL case only returning the maximum output size, and not necessarily the
actual size.
For testing, update example_sign to determine the signature size using the NULL
behavior rather than querying the RSA key.
Change-Id: Iec6c2862028a5cfdefe8faa0e8c471755070898a
Reviewed-on: https://boringssl-review.googlesource.com/1121
Reviewed-by: Adam Langley <agl@google.com>
This change adds a new function, BN_bn2bin_padded, that attempts, as
much as possible, to serialise a BIGNUM in constant time.
This is used to avoid some timing leaks in RSA decryption.
Initial fork from f2d678e6e89b6508147086610e985d4e8416e867 (1.0.2 beta).
(This change contains substantial changes from the original and
effectively starts a new history.)
