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crypto: rsa - Generate fixed-length output

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Every implementation of RSA that we have naturally generates
output with leading zeroes.  The one and only user of RSA,
pkcs1pad wants to have those leading zeroes in place, in fact
because they are currently absent it has to write those zeroes
itself.

So we shouldn't be stripping leading zeroes in the first place.
In fact this patch makes rsa-generic produce output with fixed
length so that pkcs1pad does not need to do any extra work.

This patch also changes DH to use the new interface.

Signed-off-by: Herbert Xu <[email protected]>
This commit is contained in:
Herbert Xu 2016-06-29 19:32:21 +08:00
commit 9b45b7bba3
4 changed files with 32 additions and 35 deletions
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2
crypto/dh.c
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@ -129,7 +129,7 @@ static int dh_compute_value(struct kpp_request *req)
if (ret)
goto err_free_base;
ret = mpi_write_to_sgl(val, req->dst, &req->dst_len, &sign);
ret = mpi_write_to_sgl(val, req->dst, req->dst_len, &sign);
if (ret)
goto err_free_base;