tree 416d9d206fbcbf0e4a12f8b0ce5e3c1746fa713a
parent 73f79189603b3cd8af1ba1ad2d71f1b3f0aa796d
author Herbert Xu <herbert@gondor.apana.org.au> 1467199948 +0800
committer Herbert Xu <herbert@gondor.apana.org.au> 1467387920 +0800

crypto: rsa-pkcs1pad - Avoid copying output when possible

In the vast majority of cases (2^-32 on 32-bit and 2^-64 on 64-bit)
cases, the result from encryption/signing will require no padding.

This patch makes these two operations write their output directly
to the final destination.  Only in the exceedingly rare cases where
fixup is needed to we copy it out and back to add the leading zeroes.

This patch also makes use of the crypto_akcipher_set_crypt API
instead of writing the akcipher request directly.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>