crypto: Support export akcipher to pkcs8

crypto: support export RSA private keys with PKCS#8 standard.
So that users can upload this private key to linux kernel.

Signed-off-by: lei he <helei.sig11@bytedance.com>
Message-Id: <20221008085030.70212-4-helei.sig11@bytedance.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>

1 files changed, 18 insertions, 0 deletions

diff --git a/crypto/akcipher.c b/crypto/akcipher.c
index ad88379..e4bbc6e 100644
--- a/crypto/akcipher.c
+++ b/crypto/akcipher.c
@@ -22,6 +22,8 @@
 #include "qemu/osdep.h"
 #include "crypto/akcipher.h"
 #include "akcipherpriv.h"
+#include "der.h"
+#include "rsakey.h"
 
 #if defined(CONFIG_GCRYPT)
 #include "akcipher-gcrypt.c.inc"
@@ -106,3 +108,19 @@ void qcrypto_akcipher_free(QCryptoAkCipher *akcipher)
 
     drv->free(akcipher);
 }
+
+int qcrypto_akcipher_export_p8info(const QCryptoAkCipherOptions *opts,
+                                   uint8_t *key, size_t keylen,
+                                   uint8_t **dst, size_t *dst_len,
+                                   Error **errp)
+{
+    switch (opts->alg) {
+    case QCRYPTO_AKCIPHER_ALG_RSA:
+        qcrypto_akcipher_rsakey_export_p8info(key, keylen, dst, dst_len);
+        return 0;
+
+    default:
+        error_setg(errp, "Unsupported algorithm: %u", opts->alg);
+        return -1;
+    }
+}