Add dedicated getter for the IV size to the crypter_t interface

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,