grub2/0137-crypto-move-storage-for-grub_crypto_pk_-to-crypto.c.patch

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 b084dc9a22f..a45c2213c4a 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 396f7641080..d53ddbe2c44 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)