pk11_uri: pem encoder and decoder

Register an encoder for writing the PrivateKeyInfo as PEM. The encoder
writes the pcsk11-uri to the PEM file. The file has the following structure:
{
ASN1_OBJECT *type; // set to "2.5.4.83"
ASN1_UTF8STRING *uri; // pkcs11-uri as produced by p11prov_key_to_uri()
}

The feature has to be enabled explicitly by setting
pkcs11-module-encode-key-uri-to-pem.

Signed-off-by: Florian Wernli <[email protected]>

.github/workflows/shellcheck.yml

@@ -30,6 +30,7 @@ jobs:
             thkdf
             toaepsha2
             top_state
+            tpem_encoder
             tpubkey
             trand
             trsapss

src/Makefile.am

@@ -5,10 +5,12 @@ noinst_HEADERS = \
 	asymmetric_cipher.h \
 	debug.h \
 	encoder.h \
+	decoder.h \
 	digests.h \
 	exchange.h \
 	kdf.h \
 	keymgmt.h \
+	pk11_uri.h \
 	interface.h \
 	objects.h \
 	pkcs11.h \
@@ -30,10 +32,12 @@ pkcs11_la_SOURCES = \
 	asymmetric_cipher.c \
 	debug.c \
 	encoder.c \
+	decoder.c \
 	digests.c \
 	exchange.c \
 	kdf.c \
 	keymgmt.c \
+	pk11_uri.c \
 	interface.c \
 	objects.c \
 	provider.h \
@@ -51,6 +55,7 @@ pkcs11_la_SOURCES = \
 EXTRA_DIST = \
 	interface.gen.c \
 	encoder.gen.c \
+	pk11_uri.gen.c \
 	$(NULL)
 
 pkcs11_la_CFLAGS = $(AM_CFLAGS) $(OPENSSL_CFLAGS) -Wall -Werror