added rsa_public_key_create(mpz_t n, mpz_t e)

src/libstrongswan/crypto/rsa/rsa_public_key.c

@@ -110,8 +110,6 @@ struct private_rsa_public_key_t {
 	chunk_t (*rsavp1) (const private_rsa_public_key_t *this, chunk_t data);
 };
 
-private_rsa_public_key_t *rsa_public_key_create_empty(void);
-
 /**
  * Implementation of private_rsa_public_key_t.rsaep and private_rsa_public_key_t.rsavp1
  */
@@ -312,6 +310,23 @@ chunk_t rsa_public_key_info_to_asn1(const mpz_t n, const mpz_t e)
 										  publicKey);
 }
 
+/**
+ * Form the RSA keyid as a SHA-1 hash of a publicKeyInfo object
+ * Also used in rsa_private_key.c.
+ */
+chunk_t rsa_public_key_id_create(mpz_t n, mpz_t e)
+{
+	chunk_t keyid;
+	chunk_t publicKeyInfo = rsa_public_key_info_to_asn1(n, e);
+	hasher_t *hasher = hasher_create(HASH_SHA1);
+
+	hasher->allocate_hash(hasher, publicKeyInfo, &keyid);
+	hasher->destroy(hasher);
+	free(publicKeyInfo.ptr);
+
+	return keyid;
+}
+
 /**
  * Implementation of rsa_public_key_t.get_publicKeyInfo.
  */
@@ -328,6 +343,9 @@ static chunk_t get_keyid(const private_rsa_public_key_t *this)
 	return this->keyid;
 }
 
+/* forward declaration used by rsa_public_key_t.clone */
+private_rsa_public_key_t *rsa_public_key_create_empty(void);
+
 /**
  * Implementation of rsa_public_key_t.clone.
  */
@@ -377,6 +395,20 @@ private_rsa_public_key_t *rsa_public_key_create_empty(void)
 	return this;
 }
 
+/*
+ * See header
+ */
+rsa_public_key_t *rsa_public_key_create(mpz_t n, mpz_t e)
+{
+	private_rsa_public_key_t *this = rsa_public_key_create_empty();
+
+	mpz_init_set(this->n, n);
+	mpz_init_set(this->e, e);
+
+	this->k = (mpz_sizeinbase(n, 2) + 7) / BITS_PER_BYTE;
+	this->keyid = rsa_public_key_id_create(n, e);
+	return &this->public;
+}
 /*
  * See header
  */
@@ -413,18 +445,8 @@ rsa_public_key_t *rsa_public_key_create_from_chunk(chunk_t blob)
 		objectID++;
 	}
 
-	this->k = (mpz_sizeinbase(this->n, 2) + 7) / 8;
+	this->k = (mpz_sizeinbase(this->n, 2) + 7) / BITS_PER_BYTE;
-	
+	this->keyid = rsa_public_key_id_create(this->n, this->e);
-	/* form the keyid as a SHA-1 hash of a publicKeyInfo object */
-	{
-		chunk_t publicKeyInfo = rsa_public_key_info_to_asn1(this->n, this->e);
-		hasher_t *hasher = hasher_create(HASH_SHA1);
-
-		hasher->allocate_hash(hasher, publicKeyInfo, &this->keyid);
-		hasher->destroy(hasher);
-		free(publicKeyInfo.ptr);
-	}
-
 	return &this->public;
 }
 

src/libstrongswan/crypto/rsa/rsa_public_key.h

@@ -40,20 +40,29 @@ typedef struct rsa_public_key_t rsa_public_key_t;
  * the EMSA encoding (see PKCS1)
  * 
  * @b Constructors:
+ * - rsa_public_key_create()
  * - rsa_public_key_create_from_chunk()
  * - rsa_public_key_create_from_file()
- * - rsa_private_key_t.get_public_key()
- * 
- * @see rsa_private_key_t
- * 
- * @todo Implement getkey() and savekey()
  *
  * @ingroup rsa
  */
 struct rsa_public_key_t {
 
 	/**
-	 * @brief Verify a EMSA-PKCS1 encodined signature.
+	 * @brief Encrypt a data block using EME-PKCS1 encoding.
+	 * 
+	 * 
+	 * @param this				calling object
+	 * @param data				plaintext input data
+	 * @param out				encrypted output data
+	 * @return
+	 * 							- SUCCESS
+	 * 							- FAILED if data block is too large
+	 */
+	status_t (*pkcs1_encrypt) (rsa_public_key_t *this, chunk_t in, chunk_t *out);
+
+	/**
+	 * @brief Verify an EMSA-PKCS1 encoded signature.
 	 * 
 	 * Processes the supplied signature with the RSAVP1 function,
 	 * selects the hash algorithm form the resultign ASN1-OID and
@@ -122,6 +131,17 @@ struct rsa_public_key_t {
 	void (*destroy) (rsa_public_key_t *this);
 };
 
+/**
+ * @brief Create a RSA public key from modulus and public exponent.
+ *
+ * @param n					modulus
+ * @param e					public exponent
+ * @return 					created rsa_public_key_t
+ * 
+ * @ingroup rsa
+ */
+rsa_public_key_t *rsa_public_key_create(mpz_t n, mpz_t e);
+
 /**
  * @brief Load an RSA public key from a chunk.
  *