File _service:tar_scm:backport-Support-NIST-P-521.patch of Package rpm

From 6344fec232cdd0e9d821a0b17e480494f4dcfd4b Mon Sep 17 00:00:00 2001
From: Michael Schroeder <mls@suse.de>
Date: Mon, 22 Apr 2024 12:54:32 +0200
Subject: [PATCH] Support NIST P-521

Conflict:don't modify digest_libgcrypt.c;modify digest_openssl.c in rpmio;
Reference:https://github.com/rpm-software-management/rpmpgp_legacy/commit/6344fec232cdd0e9d821a0b17e480494f4dcfd4b

Because the standard says we SHOULD.
---
 rpmio/digest_openssl.c   | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/rpmio/digest_openssl.c b/rpmio/digest_openssl.c
index 662b469..42eec66 100644
--- a/rpmio/digest_openssl.c
+++ b/rpmio/digest_openssl.c
@@ -556,6 +556,13 @@ static int constructECDSASigningKey(struct pgpDigKeyECDSA_s *key, int curve)
 	    OSSL_PARAM_END
 	};
 	key->evp_pkey = construct_pkey_from_param(EVP_PKEY_EC, params);
+    } else if (curve == PGPCURVE_NIST_P_521) {
+	OSSL_PARAM params[] = {
+	    OSSL_PARAM_utf8_string("group", "P-521", 5),
+	    OSSL_PARAM_octet_string("pub", key->q, key->qlen),
+	    OSSL_PARAM_END
+	};
+	key->evp_pkey = construct_pkey_from_param(EVP_PKEY_EC, params);
     }
     return key->evp_pkey ? 1 : 0;
 #else
@@ -565,6 +572,8 @@ static int constructECDSASigningKey(struct pgpDigKeyECDSA_s *key, int curve)
 	ec = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1);
     else if (curve == PGPCURVE_NIST_P_384)
 	ec = EC_KEY_new_by_curve_name(NID_secp384r1);
+    else if (curve == PGPCURVE_NIST_P_521)
+	ec = EC_KEY_new_by_curve_name(NID_secp521r1);
     if (!ec)
 	return 0;
 
@@ -817,6 +826,8 @@ static int pgpSupportedCurve(int algo, int curve)
 	return 1;
     if (algo == PGPPUBKEYALGO_ECDSA && curve == PGPCURVE_NIST_P_384)
 	return 1;
+    if (algo == PGPPUBKEYALGO_ECDSA && curve == PGPCURVE_NIST_P_521)
+	return 1;
     return 0;
 }
 
-- 
2.23.0