Add dedicated getter for the IV size to the crypter_t interface

src/libstrongswan/crypto/crypters/crypter.h

@@ -81,8 +81,8 @@ struct crypter_t {
 	/**
 	 * Encrypt a chunk of data and allocate space for the encrypted value.
 	 *
-	 * The length of the iv must equal to get_block_size(), while the length
+	 * The length of the iv must equal to get_iv_size(), while the length
-	 * of data must be a multiple it.
+	 * of data must be a multiple of get_block_size().
 	 * If encrypted is NULL, the encryption is done in-place (overwriting data).
 	 *
 	 * @param data			data to encrypt
@@ -95,8 +95,8 @@ struct crypter_t {
 	/**
 	 * Decrypt a chunk of data and allocate space for the decrypted value.
 	 *
-	 * The length of the iv must equal to get_block_size(), while the length
+	 * The length of the iv must equal to get_iv_size(), while the length
-	 * of data must be a multiple it.
+	 * of data must be a multiple of get_block_size().
 	 * If decrpyted is NULL, the encryption is done in-place (overwriting data).
 	 *
 	 * @param data			data to decrypt
@@ -109,14 +109,21 @@ struct crypter_t {
 	/**
 	 * Get the block size of the crypto algorithm.
 	 *
-	 * @return					block size in bytes
+	 * @return				block size in bytes
 	 */
 	size_t (*get_block_size) (crypter_t *this);
 
+	/**
+	 * Get the IV size of the crypto algorithm.
+	 *
+	 * @return				initialization vector size in bytes
+	 */
+	size_t (*get_iv_size)(crypter_t *this);
+
 	/**
 	 * Get the key size of the crypto algorithm.
 	 *
-	 * @return					key size in bytes
+	 * @return				key size in bytes
 	 */
 	size_t (*get_key_size) (crypter_t *this);
 
@@ -125,7 +132,7 @@ struct crypter_t {
 	 *
 	 * The length of the key must match get_key_size().
 	 *
-	 * @param key				key to set
+	 * @param key			key to set
 	 */
 	void (*set_key) (crypter_t *this, chunk_t key);
 

src/libstrongswan/plugins/aes/aes_crypter.c

@@ -1416,6 +1416,12 @@ METHOD(crypter_t, get_block_size, size_t,
 	return AES_BLOCK_SIZE;
 }
 
+METHOD(crypter_t, get_iv_size, size_t,
+	private_aes_crypter_t *this)
+{
+	return AES_BLOCK_SIZE;
+}
+
 METHOD(crypter_t, get_key_size, size_t,
 	private_aes_crypter_t *this)
 {
@@ -1545,6 +1551,7 @@ aes_crypter_t *aes_crypter_create(encryption_algorithm_t algo, size_t key_size)
 			.encrypt = _encrypt,
 			.decrypt = _decrypt,
 			.get_block_size = _get_block_size,
+			.get_iv_size = _get_iv_size,
 			.get_key_size = _get_key_size,
 			.set_key = _set_key,
 			.destroy = _destroy,

src/libstrongswan/plugins/blowfish/blowfish_crypter.c

@@ -139,6 +139,12 @@ METHOD(crypter_t, get_block_size, size_t,
 	return BLOWFISH_BLOCK_SIZE;
 }
 
+METHOD(crypter_t, get_iv_size, size_t,
+	private_blowfish_crypter_t *this)
+{
+	return BLOWFISH_BLOCK_SIZE;
+}
+
 METHOD(crypter_t, get_key_size, size_t,
 	private_blowfish_crypter_t *this)
 {
@@ -174,6 +180,7 @@ blowfish_crypter_t *blowfish_crypter_create(encryption_algorithm_t algo, size_t
 			.encrypt = _encrypt,
 			.decrypt = _decrypt,
 			.get_block_size = _get_block_size,
+			.get_iv_size = _get_iv_size,
 			.get_key_size = _get_key_size,
 			.set_key = _set_key,
 			.destroy = _destroy,

src/libstrongswan/plugins/des/des_crypter.c

@@ -1523,6 +1523,12 @@ METHOD(crypter_t, get_block_size, size_t,
 	return sizeof(des_cblock);
 }
 
+METHOD(crypter_t, get_iv_size, size_t,
+	private_des_crypter_t *this)
+{
+	return sizeof(des_cblock);
+}
+
 METHOD(crypter_t, get_key_size, size_t,
 	private_des_crypter_t *this)
 {
@@ -1559,6 +1565,7 @@ des_crypter_t *des_crypter_create(encryption_algorithm_t algo)
 	INIT(this,
 		.public.crypter = {
 			.get_block_size = _get_block_size,
+			.get_iv_size = _get_iv_size,
 			.get_key_size = _get_key_size,
 			.destroy = _destroy,
 		},

src/libstrongswan/plugins/gcrypt/gcrypt_crypter.c

@@ -83,6 +83,15 @@ METHOD(crypter_t, get_block_size, size_t,
 	return len;
 }
 
+METHOD(crypter_t, get_iv_size, size_t,
+	private_gcrypt_crypter_t *this)
+{
+	size_t len = 0;
+
+	gcry_cipher_algo_info(this->alg, GCRYCTL_GET_BLKLEN, NULL, &len);
+	return len;
+}
+
 METHOD(crypter_t, get_key_size, size_t,
 	private_gcrypt_crypter_t *this)
 {
@@ -219,6 +228,7 @@ gcrypt_crypter_t *gcrypt_crypter_create(encryption_algorithm_t algo,
 			.encrypt = _encrypt,
 			.decrypt = _decrypt,
 			.get_block_size = _get_block_size,
+			.get_iv_size = _get_iv_size,
 			.get_key_size = _get_key_size,
 			.set_key = _set_key,
 			.destroy = _destroy,

src/libstrongswan/plugins/openssl/openssl_crypter.c

@@ -162,6 +162,12 @@ METHOD(crypter_t, get_block_size, size_t,
 	return this->cipher->block_size;
 }
 
+METHOD(crypter_t, get_iv_size, size_t,
+	private_openssl_crypter_t *this)
+{
+	return this->cipher->block_size;
+}
+
 METHOD(crypter_t, get_key_size, size_t,
 	private_openssl_crypter_t *this)
 {
@@ -194,6 +200,7 @@ openssl_crypter_t *openssl_crypter_create(encryption_algorithm_t algo,
 			.encrypt = _encrypt,
 			.decrypt = _decrypt,
 			.get_block_size = _get_block_size,
+			.get_iv_size = _get_iv_size,
 			.get_key_size = _get_key_size,
 			.set_key = _set_key,
 			.destroy = _destroy,

src/libstrongswan/plugins/padlock/padlock_aes_crypter.c

@@ -125,6 +125,12 @@ METHOD(crypter_t, get_block_size, size_t,
 	return AES_BLOCK_SIZE;
 }
 
+METHOD(crypter_t, get_iv_size, size_t,
+	private_padlock_aes_crypter_t *this)
+{
+	return AES_BLOCK_SIZE;
+}
+
 METHOD(crypter_t, get_key_size, size_t,
 	private_padlock_aes_crypter_t *this)
 {
@@ -172,6 +178,7 @@ padlock_aes_crypter_t *padlock_aes_crypter_create(encryption_algorithm_t algo,
 			.encrypt = _encrypt,
 			.decrypt = _decrypt,
 			.get_block_size = _get_block_size,
+			.get_iv_size = _get_iv_size,
 			.get_key_size = _get_key_size,
 			.set_key = _set_key,
 			.destroy = _destroy,