[PATCH v8 3/9] ima-evm-utils: Convert cmd_import and calc keyid v2 to EVP_PKEY API

[Vitaly Chikunov <vt@xxxxxxxxxxxx>]

Introduce calc_pkeyid_v2() (which accepts EVP_PKEY) to replace
calc_keyid_v2() (which accepts RSA) in the future and use it in
cmd_import().

Signed-off-by: Vitaly Chikunov <vt@xxxxxxxxxxxx>
---
 src/evmctl.c    | 25 +++++++++++++++----------
 src/imaevm.h    |  1 +
 src/libimaevm.c | 30 ++++++++++++++++++++++++++++++
 3 files changed, 46 insertions(+), 10 deletions(-)

diff --git a/src/evmctl.c b/src/evmctl.c
index 15a7226..eed8f9a 100644
--- a/src/evmctl.c
+++ b/src/evmctl.c
@@ -891,7 +891,6 @@ static int cmd_import(struct command *cmd)
 	int id, len, err = 0;
 	char name[20];
 	uint8_t keyid[8];
-	RSA *key;
 
 	inkey = g_argv[optind++];
 	if (!inkey) {
@@ -925,18 +924,26 @@ static int cmd_import(struct command *cmd)
 		}
 	}
 
-	key = read_pub_key(inkey, params.x509);
-	if (!key)
-		return 1;
-
 	if (params.x509) {
+		EVP_PKEY *pkey = read_pub_pkey(inkey, params.x509);
+
+		if (!pkey)
+			return 1;
 		pub = file2bin(inkey, NULL, &len);
-		if (!pub)
-			goto out;
-		calc_keyid_v2((uint32_t *)keyid, name, key);
+		if (!pub) {
+			EVP_PKEY_free(pkey);
+			return 1;
+		}
+		calc_pkeyid_v2((uint32_t *)keyid, name, pkey);
+		EVP_PKEY_free(pkey);
 	} else {
+		RSA *key = read_pub_key(inkey, params.x509);
+
+		if (!key)
+			return 1;
 		len = key2bin(key, pub);
 		calc_keyid_v1(keyid, name, pub, len);
+		RSA_free(key);
 	}
 
 	log_info("Importing public key %s from file %s into keyring %d\n", name, inkey, id);
@@ -951,8 +958,6 @@ static int cmd_import(struct command *cmd)
 	}
 	if (params.x509)
 		free(pub);
-out:
-	RSA_free(key);
 	return err;
 }
 
diff --git a/src/imaevm.h b/src/imaevm.h
index 6d5eabd..48d2663 100644
--- a/src/imaevm.h
+++ b/src/imaevm.h
@@ -220,6 +220,7 @@ EVP_PKEY *read_pub_pkey(const char *keyfile, int x509);
 
 void calc_keyid_v1(uint8_t *keyid, char *str, const unsigned char *pkey, int len);
 void calc_keyid_v2(uint32_t *keyid, char *str, RSA *key);
+void calc_pkeyid_v2(uint32_t *keyid, char *str, EVP_PKEY *pkey);
 int key2bin(RSA *key, unsigned char *pub);
 
 int sign_hash(const char *algo, const unsigned char *hash, int size, const char *keyfile, const char *keypass, unsigned char *sig);
diff --git a/src/libimaevm.c b/src/libimaevm.c
index 23fa804..707b2e9 100644
--- a/src/libimaevm.c
+++ b/src/libimaevm.c
@@ -753,6 +753,36 @@ void calc_keyid_v2(uint32_t *keyid, char *str, RSA *key)
 	free(pkey);
 }
 
+/*
+ * Calculate keyid of the public_key part of EVP_PKEY
+ */
+void calc_pkeyid_v2(uint32_t *keyid, char *str, EVP_PKEY *pkey)
+{
+	X509_PUBKEY *pk = NULL;
+	const unsigned char *public_key = NULL;
+	int len;
+
+	/* This is more generic than i2d_PublicKey() */
+	if (X509_PUBKEY_set(&pk, pkey) &&
+	    X509_PUBKEY_get0_param(NULL, &public_key, &len, NULL, pk)) {
+		uint8_t sha1[SHA_DIGEST_LENGTH];
+
+		SHA1(public_key, len, sha1);
+		/* sha1[12 - 19] is exactly keyid from gpg file */
+		memcpy(keyid, sha1 + 16, 4);
+	} else
+		*keyid = 0;
+
+	log_debug("keyid: ");
+	log_debug_dump(keyid, 4);
+	sprintf(str, "%x", __be32_to_cpup(keyid));
+
+	if (params.verbose > LOG_INFO)
+		log_info("keyid: %s\n", str);
+
+	X509_PUBKEY_free(pk);
+}
+
 static EVP_PKEY *read_priv_pkey(const char *keyfile, const char *keypass)
 {
 	FILE *fp;
-- 
2.11.0