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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 <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu
2016-06-29 19:32:21 +08:00
parent 50d2b643ea
commit 9b45b7bba3
4 changed files with 32 additions and 35 deletions
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8
crypto/rsa.c
View File

@@ -108,7 +108,7 @@ static int rsa_enc(struct akcipher_request *req)
if (ret)
goto err_free_m;
ret = mpi_write_to_sgl(c, req->dst, &req->dst_len, &sign);
ret = mpi_write_to_sgl(c, req->dst, req->dst_len, &sign);
if (ret)
goto err_free_m;
@@ -147,7 +147,7 @@ static int rsa_dec(struct akcipher_request *req)
if (ret)
goto err_free_c;
ret = mpi_write_to_sgl(m, req->dst, &req->dst_len, &sign);
ret = mpi_write_to_sgl(m, req->dst, req->dst_len, &sign);
if (ret)
goto err_free_c;
@@ -185,7 +185,7 @@ static int rsa_sign(struct akcipher_request *req)
if (ret)
goto err_free_m;
ret = mpi_write_to_sgl(s, req->dst, &req->dst_len, &sign);
ret = mpi_write_to_sgl(s, req->dst, req->dst_len, &sign);
if (ret)
goto err_free_m;
@@ -226,7 +226,7 @@ static int rsa_verify(struct akcipher_request *req)
if (ret)
goto err_free_s;
ret = mpi_write_to_sgl(m, req->dst, &req->dst_len, &sign);
ret = mpi_write_to_sgl(m, req->dst, req->dst_len, &sign);
if (ret)
goto err_free_s;