lib: rsa: fix allocated size for rr and rrtmp in rsa_gen_key_prop()
When calculating rrtmp/rr rsa_gen_key_prop() tries to make (((rlen + 31) >> 5) + 1) steps in the rr uint32_t array and (((rlen + 7) >> 3) + 1) / 4 steps in uint32_t rrtmp[] with rlen being num_bits * 2 On a 4096bit key this comes down to to 257 uint32_t elements in rr and 256 elements in rrtmp but with the current allocation rr and rrtmp only have 129 uint32_t elements. On 2048bit keys this works by chance as the defined max_rsa_size=4096 allocates a suitable number of elements, but with an actual 4096bit key this results in other memory parts getting overwritten. So as suggested by Heinrich Schuchardt just use the actual bit-size of the key as base for the size calculation, in turn making the code compatible to any future keysizes. Suggested-by: NHeinrich Schuchardt <xypron.debian@gmx.de> Signed-off-by: NHeiko Stuebner <heiko.stuebner@theobroma-systems.com> Reviewed-by: NSimon Glass <sjg@chromium.org> rrtmp needs 2 + (((*prop)->num_bits * 2) >> 5) array elements. Reviewed-by: NHeinrich Schuchardt <xypron.glpk@gmx.de>
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