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crypto: rsa - RSA padding algorithm

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This patch adds PKCS#1 v1.5 standard RSA padding as a separate template.
This way an RSA cipher with padding can be obtained by instantiating
"pkcs1pad(rsa)".  The reason for adding this is that RSA is almost
never used without this padding (or OAEP) so it will be needed for
either certificate work in the kernel or the userspace, and I also hear
that it is likely implemented by hardware RSA in which case hardware
implementations of the whole of pkcs1pad(rsa) can be provided.

Signed-off-by: Andrew Zaborowski <[email protected]>
Signed-off-by: Herbert Xu <[email protected]>
This commit is contained in:
Andrzej Zaborowski 2015-12-05 17:09:34 +01:00 • committed by Herbert Xu
commit 3d5b1ecdea
4 changed files with 635 additions and 1 deletions
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16
crypto/rsa.c
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@ -13,6 +13,7 @@
#include <crypto/internal/rsa.h>
#include <crypto/internal/akcipher.h>
#include <crypto/akcipher.h>
#include <crypto/algapi.h>
/*
* RSAEP function [RFC3447 sec 5.1.1]
@ -315,11 +316,24 @@ static struct akcipher_alg rsa = {
static int rsa_init(void)
{
return crypto_register_akcipher(&rsa);
int err;
err = crypto_register_akcipher(&rsa);
if (err)
return err;
err = crypto_register_template(&rsa_pkcs1pad_tmpl);
if (err) {
crypto_unregister_akcipher(&rsa);
return err;
}
return 0;
}
static void rsa_exit(void)
{
crypto_unregister_template(&rsa_pkcs1pad_tmpl);
crypto_unregister_akcipher(&rsa);
}