From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001

From: Daniel Axtens <dja@axtens.net>

Date: Fri, 2 Oct 2020 10:49:26 +1000

Subject: [PATCH] crypto: move storage for grub_crypto_pk_* to crypto.c

The way gcry_rsa and friends (the asymmetric ciphers) are loaded for the

pgp module is a bit quirky.

include/grub/crypto.h contains:

  extern struct gcry_pk_spec *grub_crypto_pk_rsa;

commands/pgp.c contains the actual storage:

  struct gcry_pk_spec *grub_crypto_pk_rsa;

And the module itself saves to the storage in pgp.c:

  GRUB_MOD_INIT(gcry_rsa)

  {

    grub_crypto_pk_rsa = &_gcry_pubkey_spec_rsa;

  }

This is annoying: gcry_rsa now has a dependency on pgp!

We want to be able to bring in gcry_rsa without bringing in PGP,

so move the storage to crypto.c.

Previously, gcry_rsa depended on pgp and mpi. Now it depends on

crypto and mpi. As pgp depends on crypto, this doesn't add any new

module dependencies using the PGP verfier.

[FWIW, the story is different for the symmetric ciphers. cryptodisk

and friends (zfs encryption etc) use grub_crypto_lookup_cipher_by_name()

to get a cipher handle. That depends on grub_ciphers being populated

by people calling grub_cipher_register. import_gcry.py ensures that the

symmetric ciphers call it.]

Signed-off-by: Daniel Axtens <dja@axtens.net>

---

 grub-core/commands/pgp.c | 4 ----

 grub-core/lib/crypto.c   | 4 ++++

 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/grub-core/commands/pgp.c b/grub-core/commands/pgp.c

index 2408db4994..355a43844a 100644

--- a/grub-core/commands/pgp.c

+++ b/grub-core/commands/pgp.c

@@ -147,10 +147,6 @@ const char *hashes[] = {

   [0x0b] = "sha224"

 };

-struct gcry_pk_spec *grub_crypto_pk_dsa;

-struct gcry_pk_spec *grub_crypto_pk_ecdsa;

-struct gcry_pk_spec *grub_crypto_pk_rsa;

-

 static int

 dsa_pad (gcry_mpi_t *hmpi, grub_uint8_t *hval,

 	 const gcry_md_spec_t *hash, struct grub_public_subkey *sk);

diff --git a/grub-core/lib/crypto.c b/grub-core/lib/crypto.c

index ca334d5a40..c578128a59 100644

--- a/grub-core/lib/crypto.c

+++ b/grub-core/lib/crypto.c

@@ -121,6 +121,10 @@ grub_md_unregister (gcry_md_spec_t *cipher)

       }

 }

+struct gcry_pk_spec *grub_crypto_pk_dsa;

+struct gcry_pk_spec *grub_crypto_pk_ecdsa;

+struct gcry_pk_spec *grub_crypto_pk_rsa;

+

 void

 grub_crypto_hash (const gcry_md_spec_t *hash, void *out, const void *in,

 		  grub_size_t inlen)