diff --git a/src/libcharon/plugins/eap_md5/eap_md5.c b/src/libcharon/plugins/eap_md5/eap_md5.c
index 7f2b5874d..b2640d104 100644
--- a/src/libcharon/plugins/eap_md5/eap_md5.c
+++ b/src/libcharon/plugins/eap_md5/eap_md5.c
@@ -100,7 +100,11 @@ static status_t hash_challenge(private_eap_md5_t *this, chunk_t *response,
 		DBG1(DBG_IKE, "EAP-MD5 failed, MD5 not supported");
 		return FAILED;
 	}
-	hasher->allocate_hash(hasher, concat, response);
+	if (!hasher->allocate_hash(hasher, concat, response))
+	{
+		hasher->destroy(hasher);
+		return FAILED;
+	}
 	hasher->destroy(hasher);
 	return SUCCESS;
 }
diff --git a/src/libcharon/plugins/eap_mschapv2/eap_mschapv2.c b/src/libcharon/plugins/eap_mschapv2/eap_mschapv2.c
index dd6f56fd9..8ae20783d 100644
--- a/src/libcharon/plugins/eap_mschapv2/eap_mschapv2.c
+++ b/src/libcharon/plugins/eap_mschapv2/eap_mschapv2.c
@@ -281,7 +281,11 @@ static status_t NtPasswordHash(chunk_t password, chunk_t *password_hash)
 		DBG1(DBG_IKE, "EAP-MS-CHAPv2 failed, no MD4 hasher available");
 		return FAILED;
 	}
-	hasher->allocate_hash(hasher, password, password_hash);
+	if (!hasher->allocate_hash(hasher, password, password_hash))
+	{
+		hasher->destroy(hasher);
+		return FAILED;
+	}
 	hasher->destroy(hasher);
 	return SUCCESS;
 }
@@ -302,7 +306,11 @@ static status_t ChallengeHash(chunk_t peer_challenge, chunk_t server_challenge,
 		return FAILED;
 	}
 	concat = chunk_cata("ccc", peer_challenge, server_challenge, username);
-	hasher->allocate_hash(hasher, concat, challenge_hash);
+	if (!hasher->allocate_hash(hasher, concat, challenge_hash))
+	{
+		hasher->destroy(hasher);
+		return FAILED;
+	}
 	hasher->destroy(hasher);
 	/* we need only the first 8 octets */
 	challenge_hash->len = 8;
@@ -382,10 +390,17 @@ static status_t AuthenticatorResponse(chunk_t password_hash_hash,
 	}
 
 	concat = chunk_cata("ccc", password_hash_hash, nt_response, magic1);
-	hasher->allocate_hash(hasher, concat, &digest);
+	if (!hasher->allocate_hash(hasher, concat, &digest))
+	{
+		hasher->destroy(hasher);
+		return FAILED;
+	}
 	concat = chunk_cata("ccc", digest, challenge_hash, magic2);
-	hasher->allocate_hash(hasher, concat, response);
-
+	if (!hasher->allocate_hash(hasher, concat, response))
+	{
+		hasher->destroy(hasher);
+		return FAILED;
+	}
 	hasher->destroy(hasher);
 	chunk_free(&digest);
 	return SUCCESS;
@@ -434,7 +449,9 @@ static status_t GenerateMSK(chunk_t password_hash_hash,
 	chunk_t keypad = chunk_from_chars(
 		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 		0x00, 0x00, 0x00, 0x00, 0x00, 0x00);
-	chunk_t concat, master_key, master_receive_key, master_send_key;
+	char master_key[HASH_SIZE_SHA1];
+	char master_receive_key[HASH_SIZE_SHA1], master_send_key[HASH_SIZE_SHA1];
+	chunk_t concat, master;
 	hasher_t *hasher;
 
 	hasher = lib->crypto->create_hasher(lib->crypto, HASH_SHA1);
@@ -444,24 +461,22 @@ static status_t GenerateMSK(chunk_t password_hash_hash,
 		return FAILED;
 	}
 
+	master = chunk_create(master_key, 16);
 	concat = chunk_cata("ccc", password_hash_hash, nt_response, magic1);
-	hasher->allocate_hash(hasher, concat, &master_key);
-	master_key.len = 16;
+	concat = chunk_cata("cccc", master, shapad1, magic2, shapad2);
+	concat = chunk_cata("cccc", master, shapad1, magic3, shapad2);
+	if (!hasher->get_hash(hasher, concat, master_key) ||
+		!hasher->get_hash(hasher, concat, master_receive_key) ||
+		!hasher->get_hash(hasher, concat, master_send_key))
+	{
+		hasher->destroy(hasher);
+		return FAILED;
+	}
 
-	concat = chunk_cata("cccc", master_key, shapad1, magic2, shapad2);
-	hasher->allocate_hash(hasher, concat, &master_receive_key);
-	master_receive_key.len = 16;
-
-	concat = chunk_cata("cccc", master_key, shapad1, magic3, shapad2);
-	hasher->allocate_hash(hasher, concat, &master_send_key);
-	master_send_key.len = 16;
-
-	*msk = chunk_cat("cccc", master_receive_key, master_send_key, keypad, keypad);
+	*msk = chunk_cat("cccc", chunk_create(master_receive_key, 16),
+					 chunk_create(master_send_key, 16), keypad, keypad);
 
 	hasher->destroy(hasher);
-	chunk_free(&master_key);
-	chunk_free(&master_receive_key);
-	chunk_free(&master_send_key);
 	return SUCCESS;
 }
 
diff --git a/src/libcharon/plugins/stroke/stroke_ca.c b/src/libcharon/plugins/stroke/stroke_ca.c
index e76560fa2..763b4cc0f 100644
--- a/src/libcharon/plugins/stroke/stroke_ca.c
+++ b/src/libcharon/plugins/stroke/stroke_ca.c
@@ -354,10 +354,12 @@ METHOD(stroke_ca_t, check_for_hash_and_url, void,
 
 			if (cert->get_encoding(cert, CERT_ASN1_DER, &encoded))
 			{
-				hasher->allocate_hash(hasher, encoded, &hash);
-				section->hashes->insert_last(section->hashes,
+				if (hasher->allocate_hash(hasher, encoded, &hash))
+				{
+					section->hashes->insert_last(section->hashes,
 						identification_create_from_encoding(ID_KEY_ID, hash));
-				chunk_free(&hash);
+					chunk_free(&hash);
+				}
 				chunk_free(&encoded);
 			}
 			break;
diff --git a/src/libcharon/sa/ike_sa_manager.c b/src/libcharon/sa/ike_sa_manager.c
index d9375a45f..563e6a66f 100644
--- a/src/libcharon/sa/ike_sa_manager.c
+++ b/src/libcharon/sa/ike_sa_manager.c
@@ -1164,8 +1164,13 @@ METHOD(ike_sa_manager_t, checkout_by_message, ike_sa_t*,
 		u_int64_t our_spi;
 		chunk_t hash;
 
-		this->hasher->allocate_hash(this->hasher,
-									message->get_packet_data(message), &hash);
+		if (!this->hasher->allocate_hash(this->hasher,
+									message->get_packet_data(message), &hash))
+		{
+			DBG1(DBG_MGR, "ignoring message, failed to hash message");
+			id->destroy(id);
+			return NULL;
+		}
 
 		/* ensure this is not a retransmit of an already handled init message */
 		switch (check_and_put_init_hash(this, hash, &our_spi))
diff --git a/src/libcharon/sa/ikev1/keymat_v1.c b/src/libcharon/sa/ikev1/keymat_v1.c
index 8f6da3ca4..e2db13a13 100644
--- a/src/libcharon/sa/ikev1/keymat_v1.c
+++ b/src/libcharon/sa/ikev1/keymat_v1.c
@@ -554,7 +554,11 @@ METHOD(keymat_v1_t, derive_ike_keys, bool,
 
 	/* initial IV = hash(g^xi | g^xr) */
 	data = chunk_cata("cc", g_xi, g_xr);
-	this->hasher->allocate_hash(this->hasher, data, &this->phase1_iv.iv);
+	if (!this->hasher->allocate_hash(this->hasher, data, &this->phase1_iv.iv))
+	{
+		chunk_free(&dh_me);
+		return FALSE;
+	}
 	if (this->phase1_iv.iv.len > this->aead->get_block_size(this->aead))
 	{
 		this->phase1_iv.iv.len = this->aead->get_block_size(this->aead);
@@ -975,10 +979,15 @@ static bool generate_iv(private_keymat_v1_t *this, iv_data_t *iv)
 	else
 	{
 		/* initial phase 2 IV = hash(last_phase1_block | mid) */
-		u_int32_t net = htonl(iv->mid);
-		chunk_t data = chunk_cata("cc", this->phase1_iv.iv,
-								  chunk_from_thing(net));
-		this->hasher->allocate_hash(this->hasher, data, &iv->iv);
+		u_int32_t net;;
+		chunk_t data;
+
+		net = htonl(iv->mid);
+		data = chunk_cata("cc", this->phase1_iv.iv, chunk_from_thing(net));
+		if (!this->hasher->allocate_hash(this->hasher, data, &iv->iv))
+		{
+			return FALSE;
+		}
 		if (iv->iv.len > this->aead->get_block_size(this->aead))
 		{
 			iv->iv.len = this->aead->get_block_size(this->aead);
diff --git a/src/libcharon/sa/ikev1/tasks/isakmp_natd.c b/src/libcharon/sa/ikev1/tasks/isakmp_natd.c
index cd3bc21b0..50bf1612d 100644
--- a/src/libcharon/sa/ikev1/tasks/isakmp_natd.c
+++ b/src/libcharon/sa/ikev1/tasks/isakmp_natd.c
@@ -100,7 +100,11 @@ static chunk_t generate_natd_hash(private_isakmp_natd_t *this,
 	natd_chunk = chunk_cata("cccc", chunk_from_thing(spi_i),
 						    chunk_from_thing(spi_r), host->get_address(host),
 						    chunk_from_thing(port));
-	hasher->allocate_hash(hasher, natd_chunk, &natd_hash);
+	if (!hasher->allocate_hash(hasher, natd_chunk, &natd_hash))
+	{
+		DBG1(DBG_IKE, "creating NAT-D payload hash failed");
+		return chunk_empty;
+	}
 	DBG3(DBG_IKE, "natd_chunk %B", &natd_chunk);
 	DBG3(DBG_IKE, "natd_hash %B", &natd_hash);
 
@@ -154,6 +158,10 @@ static hash_payload_t *build_natd_payload(private_isakmp_natd_t *this, bool src,
 		ike_sa_id_t *ike_sa_id = this->ike_sa->get_id(this->ike_sa);
 		hash = generate_natd_hash(this, ike_sa_id, host);
 	}
+	if (!hash.len)
+	{
+		return NULL;
+	}
 	payload = hash_payload_create(NAT_D_V1);
 	payload->set_hash(payload, hash);
 	chunk_free(&hash);
@@ -171,14 +179,20 @@ static void add_natd_payloads(private_isakmp_natd_t *this, message_t *message)
 	/* destination has to be added first */
 	host = message->get_destination(message);
 	payload = build_natd_payload(this, FALSE, host);
-	message->add_payload(message, (payload_t*)payload);
+	if (payload)
+	{
+		message->add_payload(message, (payload_t*)payload);
+	}
 
 	/* source is added second, compared with IKEv2 we always know the source,
 	 * as these payloads are added in the second Phase 1 exchange or the
 	 * response to the first */
 	host = message->get_source(message);
 	payload = build_natd_payload(this, TRUE, host);
-	message->add_payload(message, (payload_t*)payload);
+	if (payload)
+	{
+		message->add_payload(message, (payload_t*)payload);
+	}
 }
 
 /**
diff --git a/src/libcharon/sa/ikev2/connect_manager.c b/src/libcharon/sa/ikev2/connect_manager.c
index 75bb8f7ea..5fdcea1ab 100644
--- a/src/libcharon/sa/ikev2/connect_manager.c
+++ b/src/libcharon/sa/ikev2/connect_manager.c
@@ -839,7 +839,10 @@ static chunk_t build_signature(private_connect_manager_t *this,
 	/* signature = SHA1( MID | ME_CONNECTID | ME_ENDPOINT | ME_CONNECTKEY ) */
 	sig_chunk = chunk_cat("cccc", mid_chunk, check->connect_id,
 						  check->endpoint_raw, key_chunk);
-	this->hasher->allocate_hash(this->hasher, sig_chunk, &sig_hash);
+	if (!this->hasher->allocate_hash(this->hasher, sig_chunk, &sig_hash))
+	{
+		sig_hash = chunk_empty;
+	}
 	DBG3(DBG_IKE, "sig_chunk %#B", &sig_chunk);
 	DBG3(DBG_IKE, "sig_hash %#B", &sig_hash);
 
diff --git a/src/libcharon/sa/ikev2/tasks/ike_cert_post.c b/src/libcharon/sa/ikev2/tasks/ike_cert_post.c
index 10bb4d19b..a93e5137e 100644
--- a/src/libcharon/sa/ikev2/tasks/ike_cert_post.c
+++ b/src/libcharon/sa/ikev2/tasks/ike_cert_post.c
@@ -78,7 +78,12 @@ static cert_payload_t *build_cert_payload(private_ike_cert_post_t *this,
 		hasher->destroy(hasher);
 		return NULL;
 	}
-	hasher->allocate_hash(hasher, encoded, &hash);
+	if (!hasher->allocate_hash(hasher, encoded, &hash))
+	{
+		hasher->destroy(hasher);
+		chunk_free(&encoded);
+		return cert_payload_create_from_cert(CERTIFICATE, cert);
+	}
 	chunk_free(&encoded);
 	hasher->destroy(hasher);
 	id = identification_create_from_encoding(ID_KEY_ID, hash);
diff --git a/src/libcharon/sa/ikev2/tasks/ike_natd.c b/src/libcharon/sa/ikev2/tasks/ike_natd.c
index 55c028686..b97b37290 100644
--- a/src/libcharon/sa/ikev2/tasks/ike_natd.c
+++ b/src/libcharon/sa/ikev2/tasks/ike_natd.c
@@ -104,7 +104,10 @@ static chunk_t generate_natd_hash(private_ike_natd_t *this,
 
 	/*  natd_hash = SHA1( spi_i | spi_r | address | port ) */
 	natd_chunk = chunk_cat("cccc", spi_i_chunk, spi_r_chunk, addr_chunk, port_chunk);
-	this->hasher->allocate_hash(this->hasher, natd_chunk, &natd_hash);
+	if (!this->hasher->allocate_hash(this->hasher, natd_chunk, &natd_hash))
+	{
+		natd_hash = chunk_empty;
+	}
 	DBG3(DBG_IKE, "natd_chunk %B", &natd_chunk);
 	DBG3(DBG_IKE, "natd_hash %B", &natd_hash);
 
@@ -152,6 +155,10 @@ static notify_payload_t *build_natd_payload(private_ike_natd_t *this,
 	{
 		hash = generate_natd_hash(this, ike_sa_id, host);
 	}
+	if (!hash.len)
+	{
+		return NULL;
+	}
 	notify = notify_payload_create(NOTIFY);
 	notify->set_notify_type(notify, type);
 	notify->set_notification_data(notify, hash);
@@ -298,7 +305,10 @@ METHOD(task_t, build_i, status_t,
 	/* destination is always set */
 	host = message->get_destination(message);
 	notify = build_natd_payload(this, NAT_DETECTION_DESTINATION_IP, host);
-	message->add_payload(message, (payload_t*)notify);
+	if (notify)
+	{
+		message->add_payload(message, (payload_t*)notify);
+	}
 
 	/* source may be any, we have 3 possibilities to get our source address:
 	 * 1. It is defined in the config => use the one of the IKE_SA
@@ -309,7 +319,10 @@ METHOD(task_t, build_i, status_t,
 	if (!host->is_anyaddr(host) || ike_cfg->force_encap(ike_cfg))
 	{	/* 1. or if we force UDP encap, as it doesn't matter if it's %any */
 		notify = build_natd_payload(this, NAT_DETECTION_SOURCE_IP, host);
-		message->add_payload(message, (payload_t*)notify);
+		if (notify)
+		{
+			message->add_payload(message, (payload_t*)notify);
+		}
 	}
 	else
 	{
@@ -319,7 +332,10 @@ METHOD(task_t, build_i, status_t,
 		{	/* 2. */
 			host->set_port(host, ike_cfg->get_my_port(ike_cfg));
 			notify = build_natd_payload(this, NAT_DETECTION_SOURCE_IP, host);
-			message->add_payload(message, (payload_t*)notify);
+			if (notify)
+			{
+				message->add_payload(message, (payload_t*)notify);
+			}
 			host->destroy(host);
 		}
 		else
@@ -333,7 +349,10 @@ METHOD(task_t, build_i, status_t,
 				host->set_port(host, ike_cfg->get_my_port(ike_cfg));
 				notify = build_natd_payload(this, NAT_DETECTION_SOURCE_IP, host);
 				host->destroy(host);
-				message->add_payload(message, (payload_t*)notify);
+				if (notify)
+				{
+					message->add_payload(message, (payload_t*)notify);
+				}
 			}
 			enumerator->destroy(enumerator);
 		}
@@ -365,11 +384,16 @@ METHOD(task_t, build_r, status_t,
 		/* initiator seems to support NAT detection, add response */
 		me = message->get_source(message);
 		notify = build_natd_payload(this, NAT_DETECTION_SOURCE_IP, me);
-		message->add_payload(message, (payload_t*)notify);
-
+		if (notify)
+		{
+			message->add_payload(message, (payload_t*)notify);
+		}
 		other = message->get_destination(message);
 		notify = build_natd_payload(this, NAT_DETECTION_DESTINATION_IP, other);
-		message->add_payload(message, (payload_t*)notify);
+		if (notify)
+		{
+			message->add_payload(message, (payload_t*)notify);
+		}
 	}
 	return SUCCESS;
 }
diff --git a/src/libpts/pts/pts.c b/src/libpts/pts/pts.c
index 01ed196d9..16047aa08 100644
--- a/src/libpts/pts/pts.c
+++ b/src/libpts/pts/pts.c
@@ -287,10 +287,15 @@ METHOD(pts_t, calculate_secret, bool,
 	hash_alg = pts_meas_algo_to_hash(this->dh_hash_algorithm);
 	hasher = lib->crypto->create_hasher(lib->crypto, hash_alg);
 
-	hasher->allocate_hash(hasher, chunk_from_chars('1'), NULL);
-	hasher->allocate_hash(hasher, this->initiator_nonce, NULL);
-	hasher->allocate_hash(hasher, this->responder_nonce, NULL);
-	hasher->allocate_hash(hasher, shared_secret, &this->secret);
+	if (!hasher ||
+		!hasher->get_hash(hasher, chunk_from_chars('1'), NULL) ||
+		!hasher->get_hash(hasher, this->initiator_nonce, NULL) ||
+		!hasher->get_hash(hasher, this->responder_nonce, NULL) ||
+		!hasher->allocate_hash(hasher, shared_secret, &this->secret))
+	{
+		DESTROY_IF(hasher);
+		return FALSE;
+	}
 	hasher->destroy(hasher);
 
 	/* The DH secret must be destroyed */
@@ -1073,7 +1078,12 @@ METHOD(pts_t, get_quote_info, bool,
 		hasher = lib->crypto->create_hasher(lib->crypto, algo);
 
 		/* Hash the PCR Composite Structure */
-		hasher->allocate_hash(hasher, pcr_comp, out_pcr_comp);
+		if (!hasher || !hasher->allocate_hash(hasher, pcr_comp, out_pcr_comp))
+		{
+			DESTROY_IF(hasher);
+			free(pcr_comp.ptr);
+			return FALSE;
+		}
 		DBG3(DBG_PTS, "constructed PCR Composite hash: %#B", out_pcr_comp);
 		hasher->destroy(hasher);
 	}
@@ -1084,7 +1094,13 @@ METHOD(pts_t, get_quote_info, bool,
 
 	/* SHA1 hash of PCR Composite to construct TPM_QUOTE_INFO */
 	hasher = lib->crypto->create_hasher(lib->crypto, HASH_SHA1);
-	hasher->allocate_hash(hasher, pcr_comp, &hash_pcr_comp);
+	if (!hasher || !hasher->allocate_hash(hasher, pcr_comp, &hash_pcr_comp))
+	{
+		DESTROY_IF(hasher);
+		chunk_free(out_pcr_comp);
+		free(pcr_comp.ptr);
+		return FALSE;
+	}
 	hasher->destroy(hasher);
 
 	/* Construct TPM_QUOTE_INFO/TPM_QUOTE_INFO2 structure */
diff --git a/src/libsimaka/simaka_crypto.c b/src/libsimaka/simaka_crypto.c
index de6d1c365..898e66816 100644
--- a/src/libsimaka/simaka_crypto.c
+++ b/src/libsimaka/simaka_crypto.c
@@ -124,11 +124,11 @@ METHOD(simaka_crypto_t, derive_keys_full, bool,
 
 	/* For SIM: MK = SHA1(Identity|n*Kc|NONCE_MT|Version List|Selected Version)
 	 * For AKA: MK = SHA1(Identity|IK|CK) */
-	if (!this->hasher->get_hash(this->hasher, id->get_encoding(id), NULL))
+	if (!this->hasher->get_hash(this->hasher, id->get_encoding(id), NULL) ||
+		!this->hasher->allocate_hash(this->hasher, data, mk))
 	{
 		return FALSE;
 	}
-	this->hasher->allocate_hash(this->hasher, data, mk);
 	DBG3(DBG_LIB, "MK %B", mk);
 
 	/* K_encr | K_auth | MSK | EMSK = prf() | prf() | prf() | prf() */
diff --git a/src/libstrongswan/crypto/crypto_tester.c b/src/libstrongswan/crypto/crypto_tester.c
index f422a2c19..046222279 100644
--- a/src/libstrongswan/crypto/crypto_tester.c
+++ b/src/libstrongswan/crypto/crypto_tester.c
@@ -735,7 +735,10 @@ METHOD(crypto_tester_t, test_hasher, bool,
 
 		/* allocated hash */
 		data = chunk_create(vector->data, vector->len);
-		hasher->allocate_hash(hasher, data, &hash);
+		if (!hasher->allocate_hash(hasher, data, &hash))
+		{
+			failed = TRUE;
+		}
 		if (hash.len != hasher->get_hash_size(hasher))
 		{
 			failed = TRUE;
@@ -758,8 +761,8 @@ METHOD(crypto_tester_t, test_hasher, bool,
 		if (data.len > 2)
 		{
 			memset(hash.ptr, 0, hash.len);
-			hasher->allocate_hash(hasher, chunk_create(data.ptr, 1), NULL);
-			if (!hasher->get_hash(hasher, chunk_create(data.ptr + 1, 1), NULL) ||
+			if (!hasher->allocate_hash(hasher, chunk_create(data.ptr, 1), NULL) ||
+				!hasher->get_hash(hasher, chunk_create(data.ptr + 1, 1), NULL) ||
 				!hasher->get_hash(hasher, chunk_skip(data, 2), hash.ptr) ||
 				!memeq(vector->hash, hash.ptr, hash.len))
 			{
diff --git a/src/libstrongswan/crypto/hashers/hasher.h b/src/libstrongswan/crypto/hashers/hasher.h
index 0c72bb73b..0480fc642 100644
--- a/src/libstrongswan/crypto/hashers/hasher.h
+++ b/src/libstrongswan/crypto/hashers/hasher.h
@@ -94,8 +94,10 @@ struct hasher_t {
 	 *
 	 * @param data		chunk with data to hash
 	 * @param hash		chunk which will hold allocated hash
+	 * @return			TRUE if hash allocated successfully
 	 */
-	void (*allocate_hash) (hasher_t *this, chunk_t data, chunk_t *hash);
+	__attribute__((warn_unused_result))
+	bool (*allocate_hash) (hasher_t *this, chunk_t data, chunk_t *hash);
 
 	/**
 	 * Get the size of the resulting hash.
diff --git a/src/libstrongswan/crypto/pkcs7.c b/src/libstrongswan/crypto/pkcs7.c
index ded388181..0ec19f2cd 100644
--- a/src/libstrongswan/crypto/pkcs7.c
+++ b/src/libstrongswan/crypto/pkcs7.c
@@ -421,13 +421,13 @@ end:
 
 				algorithm = hasher_algorithm_from_oid(digest_alg);
 				hasher = lib->crypto->create_hasher(lib->crypto, algorithm);
-				if (hasher == NULL)
+				if (!hasher || !hasher->allocate_hash(hasher, this->data, &hash))
 				{
+					DESTROY_IF(hasher);
 					DBG1(DBG_LIB, "hash algorithm %N not supported",
 						 hash_algorithm_names, algorithm);
 					return FALSE;
 				}
-				hasher->allocate_hash(hasher, this->data, &hash);
 				hasher->destroy(hasher);
 				DBG3(DBG_LIB, "hash: %B", &hash);
 
@@ -921,13 +921,14 @@ METHOD(pkcs7_t, build_signedData, bool,
 			time_t now;
 
 			hasher = lib->crypto->create_hasher(lib->crypto, alg);
-			if (hasher == NULL)
+			if (!hasher ||
+				!hasher->allocate_hash(hasher, this->data, &messageDigest))
 			{
+				DESTROY_IF(hasher);
 				DBG1(DBG_LIB, "  hash algorithm %N not support",
 					 hash_algorithm_names, alg);
 				return FALSE;
 			}
-			hasher->allocate_hash(hasher, this->data, &messageDigest);
 			hasher->destroy(hasher);
 			this->attributes->set_attribute(this->attributes,
 									OID_PKCS9_MESSAGE_DIGEST,
diff --git a/src/libstrongswan/plugins/af_alg/af_alg_hasher.c b/src/libstrongswan/plugins/af_alg/af_alg_hasher.c
index fd2db0db5..95cdc613c 100644
--- a/src/libstrongswan/plugins/af_alg/af_alg_hasher.c
+++ b/src/libstrongswan/plugins/af_alg/af_alg_hasher.c
@@ -112,18 +112,15 @@ METHOD(hasher_t, get_hash, bool,
 	return TRUE;
 }
 
-METHOD(hasher_t, allocate_hash, void,
+METHOD(hasher_t, allocate_hash, bool,
 	private_af_alg_hasher_t *this, chunk_t chunk, chunk_t *hash)
 {
 	if (hash)
 	{
 		*hash = chunk_alloc(get_hash_size(this));
-		get_hash(this, chunk, hash->ptr);
-	}
-	else
-	{
-		get_hash(this, chunk, NULL);
+		return get_hash(this, chunk, hash->ptr);
 	}
+	return get_hash(this, chunk, NULL);
 }
 
 METHOD(hasher_t, destroy, void,
diff --git a/src/libstrongswan/plugins/gcrypt/gcrypt_hasher.c b/src/libstrongswan/plugins/gcrypt/gcrypt_hasher.c
index 24e64800e..5de5b118c 100644
--- a/src/libstrongswan/plugins/gcrypt/gcrypt_hasher.c
+++ b/src/libstrongswan/plugins/gcrypt/gcrypt_hasher.c
@@ -61,18 +61,15 @@ METHOD(hasher_t, get_hash, bool,
 	return TRUE;
 }
 
-METHOD(hasher_t, allocate_hash, void,
+METHOD(hasher_t, allocate_hash, bool,
 	private_gcrypt_hasher_t *this, chunk_t chunk, chunk_t *hash)
 {
 	if (hash)
 	{
 		*hash = chunk_alloc(get_hash_size(this));
-		get_hash(this, chunk, hash->ptr);
-	}
-	else
-	{
-		get_hash(this, chunk, NULL);
+		return get_hash(this, chunk, hash->ptr);
 	}
+	return get_hash(this, chunk, NULL);
 }
 
 METHOD(hasher_t, destroy, void,
diff --git a/src/libstrongswan/plugins/gcrypt/gcrypt_rsa_private_key.c b/src/libstrongswan/plugins/gcrypt/gcrypt_rsa_private_key.c
index eb38eea3b..9fdb2d45b 100644
--- a/src/libstrongswan/plugins/gcrypt/gcrypt_rsa_private_key.c
+++ b/src/libstrongswan/plugins/gcrypt/gcrypt_rsa_private_key.c
@@ -165,11 +165,11 @@ static bool sign_pkcs1(private_gcrypt_rsa_private_key_t *this,
 		return FALSE;
 	}
 	hasher = lib->crypto->create_hasher(lib->crypto, hash_algorithm);
-	if (!hasher)
+	if (!hasher || !hasher->allocate_hash(hasher, data, &hash))
 	{
+		DESTROY_IF(hasher);
 		return FALSE;
 	}
-	hasher->allocate_hash(hasher, data, &hash);
 	hasher->destroy(hasher);
 
 	err = gcry_sexp_build(&in, NULL, "(data(flags pkcs1)(hash %s %b))",
diff --git a/src/libstrongswan/plugins/gcrypt/gcrypt_rsa_public_key.c b/src/libstrongswan/plugins/gcrypt/gcrypt_rsa_public_key.c
index f8645da97..c54f2c0cf 100644
--- a/src/libstrongswan/plugins/gcrypt/gcrypt_rsa_public_key.c
+++ b/src/libstrongswan/plugins/gcrypt/gcrypt_rsa_public_key.c
@@ -121,11 +121,11 @@ static bool verify_pkcs1(private_gcrypt_rsa_public_key_t *this,
 	gcry_sexp_t in, sig;
 
 	hasher = lib->crypto->create_hasher(lib->crypto, algorithm);
-	if (!hasher)
+	if (!hasher || !hasher->allocate_hash(hasher, data, &hash))
 	{
+		DESTROY_IF(hasher);
 		return FALSE;
 	}
-	hasher->allocate_hash(hasher, data, &hash);
 	hasher->destroy(hasher);
 
 	err = gcry_sexp_build(&in, NULL, "(data(flags pkcs1)(hash %s %b))",
diff --git a/src/libstrongswan/plugins/gmp/gmp_rsa_private_key.c b/src/libstrongswan/plugins/gmp/gmp_rsa_private_key.c
index acd9ae2b7..590ab6cb4 100644
--- a/src/libstrongswan/plugins/gmp/gmp_rsa_private_key.c
+++ b/src/libstrongswan/plugins/gmp/gmp_rsa_private_key.c
@@ -235,11 +235,11 @@ static bool build_emsa_pkcs1_signature(private_gmp_rsa_private_key_t *this,
 		}
 
 		hasher = lib->crypto->create_hasher(lib->crypto, hash_algorithm);
-		if (hasher == NULL)
+		if (!hasher || !hasher->allocate_hash(hasher, data, &hash))
 		{
+			DESTROY_IF(hasher);
 			return FALSE;
 		}
-		hasher->allocate_hash(hasher, data, &hash);
 		hasher->destroy(hasher);
 
 		/* build DER-encoded digestInfo */
diff --git a/src/libstrongswan/plugins/gmp/gmp_rsa_public_key.c b/src/libstrongswan/plugins/gmp/gmp_rsa_public_key.c
index db7b8e49a..2d84f0025 100644
--- a/src/libstrongswan/plugins/gmp/gmp_rsa_public_key.c
+++ b/src/libstrongswan/plugins/gmp/gmp_rsa_public_key.c
@@ -252,7 +252,11 @@ static bool verify_emsa_pkcs1_signature(private_gmp_rsa_public_key_t *this,
 					}
 
 					/* build our own hash and compare */
-					hasher->allocate_hash(hasher, data, &hash);
+					if (!hasher->allocate_hash(hasher, data, &hash))
+					{
+						hasher->destroy(hasher);
+						goto end_parser;
+					}
 					hasher->destroy(hasher);
 					success = memeq(object.ptr, hash.ptr, hash.len);
 					free(hash.ptr);
diff --git a/src/libstrongswan/plugins/md4/md4_hasher.c b/src/libstrongswan/plugins/md4/md4_hasher.c
index 0d080061f..bf934141a 100644
--- a/src/libstrongswan/plugins/md4/md4_hasher.c
+++ b/src/libstrongswan/plugins/md4/md4_hasher.c
@@ -266,8 +266,6 @@ static void MD4Final (private_md4_hasher_t *this, u_int8_t digest[16])
 	}
 }
 
-
-
 METHOD(hasher_t, get_hash, bool,
 	private_md4_hasher_t *this, chunk_t chunk, u_int8_t *buffer)
 {
@@ -280,7 +278,7 @@ METHOD(hasher_t, get_hash, bool,
 	return TRUE;
 }
 
-METHOD(hasher_t, allocate_hash, void,
+METHOD(hasher_t, allocate_hash, bool,
 	private_md4_hasher_t *this, chunk_t chunk, chunk_t *hash)
 {
 	chunk_t allocated_hash;
@@ -296,6 +294,7 @@ METHOD(hasher_t, allocate_hash, void,
 
 		*hash = allocated_hash;
 	}
+	return TRUE;
 }
 
 METHOD(hasher_t, get_hash_size, size_t,
diff --git a/src/libstrongswan/plugins/md5/md5_hasher.c b/src/libstrongswan/plugins/md5/md5_hasher.c
index dcd2cdd1a..ea8c45010 100644
--- a/src/libstrongswan/plugins/md5/md5_hasher.c
+++ b/src/libstrongswan/plugins/md5/md5_hasher.c
@@ -311,7 +311,7 @@ METHOD(hasher_t, get_hash, bool,
 	return TRUE;
 }
 
-METHOD(hasher_t, allocate_hash, void,
+METHOD(hasher_t, allocate_hash, bool,
 	private_md5_hasher_t *this, chunk_t chunk, chunk_t *hash)
 {
 	chunk_t allocated_hash;
@@ -327,6 +327,7 @@ METHOD(hasher_t, allocate_hash, void,
 
 		*hash = allocated_hash;
 	}
+	return TRUE;
 }
 
 METHOD(hasher_t, get_hash_size, size_t,
diff --git a/src/libstrongswan/plugins/openssl/openssl_ec_public_key.c b/src/libstrongswan/plugins/openssl/openssl_ec_public_key.c
index 7461695ad..9cb68a3ab 100644
--- a/src/libstrongswan/plugins/openssl/openssl_ec_public_key.c
+++ b/src/libstrongswan/plugins/openssl/openssl_ec_public_key.c
@@ -221,13 +221,13 @@ bool openssl_ec_fingerprint(EC_KEY *ec, cred_encoding_type_t type, chunk_t *fp)
 			return FALSE;
 	}
 	hasher = lib->crypto->create_hasher(lib->crypto, HASH_SHA1);
-	if (!hasher)
+	if (!hasher || !hasher->allocate_hash(hasher, key, fp))
 	{
 		DBG1(DBG_LIB, "SHA1 hash algorithm not supported, fingerprinting failed");
+		DESTROY_IF(hasher);
 		free(key.ptr);
 		return FALSE;
 	}
-	hasher->allocate_hash(hasher, key, fp);
 	hasher->destroy(hasher);
 	free(key.ptr);
 	lib->encoding->cache(lib->encoding, type, ec, *fp);
diff --git a/src/libstrongswan/plugins/openssl/openssl_hasher.c b/src/libstrongswan/plugins/openssl/openssl_hasher.c
index 5b353647a..67b49c186 100644
--- a/src/libstrongswan/plugins/openssl/openssl_hasher.c
+++ b/src/libstrongswan/plugins/openssl/openssl_hasher.c
@@ -120,18 +120,15 @@ METHOD(hasher_t, get_hash, bool,
 	return TRUE;
 }
 
-METHOD(hasher_t, allocate_hash, void,
+METHOD(hasher_t, allocate_hash, bool,
 	private_openssl_hasher_t *this, chunk_t chunk, chunk_t *hash)
 {
 	if (hash)
 	{
 		*hash = chunk_alloc(get_hash_size(this));
-		get_hash(this, chunk, hash->ptr);
-	}
-	else
-	{
-		get_hash(this, chunk, NULL);
+		return get_hash(this, chunk, hash->ptr);
 	}
+	return get_hash(this, chunk, NULL);
 }
 
 METHOD(hasher_t, destroy, void,
diff --git a/src/libstrongswan/plugins/openssl/openssl_rsa_public_key.c b/src/libstrongswan/plugins/openssl/openssl_rsa_public_key.c
index a24bae5d6..5872a8159 100644
--- a/src/libstrongswan/plugins/openssl/openssl_rsa_public_key.c
+++ b/src/libstrongswan/plugins/openssl/openssl_rsa_public_key.c
@@ -217,13 +217,13 @@ bool openssl_rsa_fingerprint(RSA *rsa, cred_encoding_type_t type, chunk_t *fp)
 			return FALSE;
 	}
 	hasher = lib->crypto->create_hasher(lib->crypto, HASH_SHA1);
-	if (!hasher)
+	if (!hasher || !hasher->allocate_hash(hasher, key, fp))
 	{
 		DBG1(DBG_LIB, "SHA1 hash algorithm not supported, fingerprinting failed");
+		DESTROY_IF(hasher);
 		free(key.ptr);
 		return FALSE;
 	}
-	hasher->allocate_hash(hasher, key, fp);
 	free(key.ptr);
 	hasher->destroy(hasher);
 	lib->encoding->cache(lib->encoding, type, rsa, *fp);
diff --git a/src/libstrongswan/plugins/openssl/openssl_x509.c b/src/libstrongswan/plugins/openssl/openssl_x509.c
index ee19c4179..e85c5cc90 100644
--- a/src/libstrongswan/plugins/openssl/openssl_x509.c
+++ b/src/libstrongswan/plugins/openssl/openssl_x509.c
@@ -973,11 +973,11 @@ static bool parse_certificate(private_openssl_x509_t *this)
 	parse_extKeyUsage(this);
 
 	hasher = lib->crypto->create_hasher(lib->crypto, HASH_SHA1);
-	if (!hasher)
+	if (!hasher || !hasher->allocate_hash(hasher, this->encoding, &this->hash))
 	{
+		DESTROY_IF(hasher);
 		return FALSE;
 	}
-	hasher->allocate_hash(hasher, this->encoding, &this->hash);
 	hasher->destroy(hasher);
 
 	if (issued_by(this, &this->public.x509.interface, NULL))
diff --git a/src/libstrongswan/plugins/padlock/padlock_sha1_hasher.c b/src/libstrongswan/plugins/padlock/padlock_sha1_hasher.c
index fd3d195b4..406daad1e 100644
--- a/src/libstrongswan/plugins/padlock/padlock_sha1_hasher.c
+++ b/src/libstrongswan/plugins/padlock/padlock_sha1_hasher.c
@@ -112,18 +112,15 @@ METHOD(hasher_t, get_hash, bool,
 	return TRUE;
 }
 
-METHOD(hasher_t, allocate_hash, void,
+METHOD(hasher_t, allocate_hash, bool,
 	private_padlock_sha1_hasher_t *this, chunk_t chunk, chunk_t *hash)
 {
 	if (hash)
 	{
 		*hash = chunk_alloc(HASH_SIZE_SHA1);
-		get_hash(this, chunk, hash->ptr);
-	}
-	else
-	{
-		get_hash(this, chunk, NULL);
+		return get_hash(this, chunk, hash->ptr);
 	}
+	return get_hash(this, chunk, NULL);
 }
 
 METHOD(hasher_t, get_hash_size, size_t,
diff --git a/src/libstrongswan/plugins/pgp/pgp_cert.c b/src/libstrongswan/plugins/pgp/pgp_cert.c
index e6d13a243..a99bed2f6 100644
--- a/src/libstrongswan/plugins/pgp/pgp_cert.c
+++ b/src/libstrongswan/plugins/pgp/pgp_cert.c
@@ -321,8 +321,12 @@ static bool parse_public_key(private_pgp_cert_t *this, chunk_t packet)
 			DBG1(DBG_ASN, "no SHA-1 hasher available");
 			return FALSE;
 		}
-		hasher->allocate_hash(hasher, pubkey_packet_header, NULL);
-		hasher->allocate_hash(hasher, pubkey_packet, &this->fingerprint);
+		if (!hasher->allocate_hash(hasher, pubkey_packet_header, NULL) ||
+			!hasher->allocate_hash(hasher, pubkey_packet, &this->fingerprint))
+		{
+			hasher->destroy(hasher);
+			return FALSE;
+		}
 		hasher->destroy(hasher);
 		DBG2(DBG_ASN, "L2 - v4 fingerprint %#B", &this->fingerprint);
 	}
diff --git a/src/libstrongswan/plugins/pgp/pgp_encoder.c b/src/libstrongswan/plugins/pgp/pgp_encoder.c
index 9043cdb9f..d16d1d71b 100644
--- a/src/libstrongswan/plugins/pgp/pgp_encoder.c
+++ b/src/libstrongswan/plugins/pgp/pgp_encoder.c
@@ -44,8 +44,12 @@ static bool build_v3_fingerprint(chunk_t *encoding, va_list args)
 		{
 			e = chunk_skip(e, 1);
 		}
-		hasher->allocate_hash(hasher, n, NULL);
-		hasher->allocate_hash(hasher, e, encoding);
+		if (!hasher->allocate_hash(hasher, n, NULL) ||
+			!hasher->allocate_hash(hasher, e, encoding))
+		{
+			hasher->destroy(hasher);
+			return FALSE;
+		}
 		hasher->destroy(hasher);
 		return TRUE;
 	}
diff --git a/src/libstrongswan/plugins/pkcs1/pkcs1_encoder.c b/src/libstrongswan/plugins/pkcs1/pkcs1_encoder.c
index 6957b2ad1..9122e8d8e 100644
--- a/src/libstrongswan/plugins/pkcs1/pkcs1_encoder.c
+++ b/src/libstrongswan/plugins/pkcs1/pkcs1_encoder.c
@@ -94,14 +94,14 @@ static bool hash_pubkey(chunk_t pubkey, chunk_t *hash)
 	hasher_t *hasher;
 
 	hasher = lib->crypto->create_hasher(lib->crypto, HASH_SHA1);
-	if (hasher == NULL)
+	if (!hasher || !hasher->allocate_hash(hasher, pubkey, hash))
 	{
+		DESTROY_IF(hasher);
 		chunk_free(&pubkey);
 		DBG1(DBG_LIB, "SHA1 hash algorithm not supported, "
 			 "fingerprinting failed");
 		return FALSE;
 	}
-	hasher->allocate_hash(hasher, pubkey, hash);
 	hasher->destroy(hasher);
 	chunk_free(&pubkey);
 	return TRUE;
diff --git a/src/libstrongswan/plugins/pkcs11/pkcs11_hasher.c b/src/libstrongswan/plugins/pkcs11/pkcs11_hasher.c
index 56aec3d74..29b7fb7a2 100644
--- a/src/libstrongswan/plugins/pkcs11/pkcs11_hasher.c
+++ b/src/libstrongswan/plugins/pkcs11/pkcs11_hasher.c
@@ -203,18 +203,15 @@ METHOD(hasher_t, get_hash, bool,
 	return TRUE;
 }
 
-METHOD(hasher_t, allocate_hash, void,
+METHOD(hasher_t, allocate_hash, bool,
 	private_pkcs11_hasher_t *this, chunk_t chunk, chunk_t *hash)
 {
 	if (hash)
 	{
 		*hash = chunk_alloc(this->size);
-		get_hash(this, chunk, hash->ptr);
-	}
-	else
-	{
-		get_hash(this, chunk, NULL);
+		return get_hash(this, chunk, hash->ptr);
 	}
+	return get_hash(this, chunk, NULL);
 }
 
 METHOD(hasher_t, destroy, void,
diff --git a/src/libstrongswan/plugins/pkcs11/pkcs11_private_key.c b/src/libstrongswan/plugins/pkcs11/pkcs11_private_key.c
index b616abc38..f7f7d3f79 100644
--- a/src/libstrongswan/plugins/pkcs11/pkcs11_private_key.c
+++ b/src/libstrongswan/plugins/pkcs11/pkcs11_private_key.c
@@ -266,13 +266,15 @@ METHOD(private_key_t, sign, bool,
 	}
 	if (hash_alg != HASH_UNKNOWN)
 	{
-		hasher_t *hasher = lib->crypto->create_hasher(lib->crypto, hash_alg);
-		if (!hasher)
+		hasher_t *hasher;
+
+		hasher = lib->crypto->create_hasher(lib->crypto, hash_alg);
+		if (!hasher || !hasher->allocate_hash(hasher, data, &hash))
 		{
+			DESTROY_IF(hasher);
 			this->lib->f->C_CloseSession(session);
 			return FALSE;
 		}
-		hasher->allocate_hash(hasher, data, &hash);
 		hasher->destroy(hasher);
 		data = hash;
 	}
diff --git a/src/libstrongswan/plugins/pkcs11/pkcs11_public_key.c b/src/libstrongswan/plugins/pkcs11/pkcs11_public_key.c
index d4ec9235d..f0d7093db 100644
--- a/src/libstrongswan/plugins/pkcs11/pkcs11_public_key.c
+++ b/src/libstrongswan/plugins/pkcs11/pkcs11_public_key.c
@@ -235,13 +235,15 @@ METHOD(public_key_t, verify, bool,
 	}
 	if (hash_alg != HASH_UNKNOWN)
 	{
-		hasher_t *hasher = lib->crypto->create_hasher(lib->crypto, hash_alg);
-		if (!hasher)
+		hasher_t *hasher;
+
+		hasher = lib->crypto->create_hasher(lib->crypto, hash_alg);
+		if (!hasher || !hasher->allocate_hash(hasher, data, &hash))
 		{
+			DESTROY_IF(hasher);
 			this->lib->f->C_CloseSession(session);
 			return FALSE;
 		}
-		hasher->allocate_hash(hasher, data, &hash);
 		hasher->destroy(hasher);
 		data = hash;
 	}
@@ -374,12 +376,12 @@ static bool fingerprint_ecdsa(private_pkcs11_public_key_t *this,
 			return FALSE;
 	}
 	hasher = lib->crypto->create_hasher(lib->crypto, HASH_SHA1);
-	if (!hasher)
+	if (!hasher || !hasher->allocate_hash(hasher, asn1, fp))
 	{
+		DESTROY_IF(hasher);
 		chunk_clear(&asn1);
 		return FALSE;
 	}
-	hasher->allocate_hash(hasher, asn1, fp);
 	hasher->destroy(hasher);
 	chunk_clear(&asn1);
 	lib->encoding->cache(lib->encoding, type, this, *fp);
diff --git a/src/libstrongswan/plugins/sha1/sha1_hasher.c b/src/libstrongswan/plugins/sha1/sha1_hasher.c
index 51d9674f3..ceb8fc0b5 100644
--- a/src/libstrongswan/plugins/sha1/sha1_hasher.c
+++ b/src/libstrongswan/plugins/sha1/sha1_hasher.c
@@ -199,7 +199,7 @@ METHOD(hasher_t, get_hash, bool,
 	return TRUE;
 }
 
-METHOD(hasher_t, allocate_hash, void,
+METHOD(hasher_t, allocate_hash, bool,
 	private_sha1_hasher_t *this, chunk_t chunk, chunk_t *hash)
 {
 	SHA1Update(this, chunk.ptr, chunk.len);
@@ -211,6 +211,7 @@ METHOD(hasher_t, allocate_hash, void,
 		SHA1Final(this, hash->ptr);
 		reset(this);
 	}
+	return TRUE;
 }
 
 METHOD(hasher_t, get_hash_size, size_t,
diff --git a/src/libstrongswan/plugins/sha2/sha2_hasher.c b/src/libstrongswan/plugins/sha2/sha2_hasher.c
index b21eba47c..607e329e0 100644
--- a/src/libstrongswan/plugins/sha2/sha2_hasher.c
+++ b/src/libstrongswan/plugins/sha2/sha2_hasher.c
@@ -512,7 +512,7 @@ METHOD(hasher_t, get_hash512, bool,
 	return TRUE;
 }
 
-METHOD(hasher_t, allocate_hash224, void,
+METHOD(hasher_t, allocate_hash224, bool,
 	private_sha256_hasher_t *this, chunk_t chunk, chunk_t *hash)
 {
 	chunk_t allocated_hash;
@@ -526,9 +526,10 @@ METHOD(hasher_t, allocate_hash224, void,
 		reset224(this);
 		*hash = allocated_hash;
 	}
+	return TRUE;
 }
 
-METHOD(hasher_t, allocate_hash256, void,
+METHOD(hasher_t, allocate_hash256, bool,
 	private_sha256_hasher_t *this, chunk_t chunk, chunk_t *hash)
 {
 	chunk_t allocated_hash;
@@ -542,9 +543,10 @@ METHOD(hasher_t, allocate_hash256, void,
 		reset256(this);
 		*hash = allocated_hash;
 	}
+	return TRUE;
 }
 
-METHOD(hasher_t, allocate_hash384, void,
+METHOD(hasher_t, allocate_hash384, bool,
 	private_sha512_hasher_t *this, chunk_t chunk, chunk_t *hash)
 {
 	chunk_t allocated_hash;
@@ -558,9 +560,10 @@ METHOD(hasher_t, allocate_hash384, void,
 		reset384(this);
 		*hash = allocated_hash;
 	}
+	return TRUE;
 }
 
-METHOD(hasher_t, allocate_hash512, void,
+METHOD(hasher_t, allocate_hash512, bool,
 	private_sha512_hasher_t *this, chunk_t chunk, chunk_t *hash)
 {
 	chunk_t allocated_hash;
@@ -574,6 +577,7 @@ METHOD(hasher_t, allocate_hash512, void,
 		reset512(this);
 		*hash = allocated_hash;
 	}
+	return TRUE;
 }
 
 METHOD(hasher_t, get_hash_size224, size_t,
diff --git a/src/libstrongswan/plugins/x509/x509_cert.c b/src/libstrongswan/plugins/x509/x509_cert.c
index 88101e805..2269eb453 100644
--- a/src/libstrongswan/plugins/x509/x509_cert.c
+++ b/src/libstrongswan/plugins/x509/x509_cert.c
@@ -1490,12 +1490,13 @@ end:
 		}
 		/* create certificate hash */
 		hasher = lib->crypto->create_hasher(lib->crypto, HASH_SHA1);
-		if (hasher == NULL)
+		if (!hasher ||
+			!hasher->allocate_hash(hasher, this->encoding, &this->encoding_hash))
 		{
+			DESTROY_IF(hasher);
 			DBG1(DBG_ASN, "  unable to create hash of certificate, SHA1 not supported");
 			return FALSE;
 		}
-		hasher->allocate_hash(hasher, this->encoding, &this->encoding_hash);
 		hasher->destroy(hasher);
 	}
 	return success;
@@ -2344,11 +2345,12 @@ static bool generate(private_x509_cert_t *cert, certificate_t *sign_cert,
 							   asn1_bitstring("c", cert->signature));
 
 	hasher = lib->crypto->create_hasher(lib->crypto, HASH_SHA1);
-	if (!hasher)
+	if (!hasher ||
+		!hasher->allocate_hash(hasher, cert->encoding, &cert->encoding_hash))
 	{
+		DESTROY_IF(hasher);
 		return FALSE;
 	}
-	hasher->allocate_hash(hasher, cert->encoding, &cert->encoding_hash);
 	hasher->destroy(hasher);
 	return TRUE;
 }
diff --git a/src/libstrongswan/plugins/x509/x509_ocsp_request.c b/src/libstrongswan/plugins/x509/x509_ocsp_request.c
index adeae3043..bbd1c5905 100644
--- a/src/libstrongswan/plugins/x509/x509_ocsp_request.c
+++ b/src/libstrongswan/plugins/x509/x509_ocsp_request.c
@@ -159,22 +159,24 @@ static chunk_t build_requestList(private_x509_ocsp_request_t *this)
 				enumerator_t *enumerator;
 
 				issuer = cert->get_subject(cert);
-				hasher->allocate_hash(hasher, issuer->get_encoding(issuer),
-									  &issuerNameHash);
-				hasher->destroy(hasher);
-
-				enumerator = this->candidates->create_enumerator(this->candidates);
-				while (enumerator->enumerate(enumerator, &x509))
+				if (hasher->allocate_hash(hasher, issuer->get_encoding(issuer),
+										  &issuerNameHash))
 				{
-					chunk_t request, serialNumber;
+					enumerator = this->candidates->create_enumerator(
+															this->candidates);
+					while (enumerator->enumerate(enumerator, &x509))
+					{
+						chunk_t request, serialNumber;
 
-					serialNumber = x509->get_serial(x509);
-					request = build_Request(this, issuerNameHash, issuerKeyHash,
-											serialNumber);
-					list = chunk_cat("mm", list, request);
+						serialNumber = x509->get_serial(x509);
+						request = build_Request(this, issuerNameHash,
+												issuerKeyHash, serialNumber);
+						list = chunk_cat("mm", list, request);
+					}
+					enumerator->destroy(enumerator);
+					chunk_free(&issuerNameHash);
 				}
-				enumerator->destroy(enumerator);
-				chunk_free(&issuerNameHash);
+				hasher->destroy(hasher);
 			}
 		}
 		else
diff --git a/src/libstrongswan/plugins/x509/x509_ocsp_response.c b/src/libstrongswan/plugins/x509/x509_ocsp_response.c
index dc3fc27ca..27497e0e3 100644
--- a/src/libstrongswan/plugins/x509/x509_ocsp_response.c
+++ b/src/libstrongswan/plugins/x509/x509_ocsp_response.c
@@ -201,19 +201,22 @@ METHOD(ocsp_response_t, get_status, cert_validation_t,
 		/* check issuerNameHash, if available */
 		else if (response->issuerNameHash.ptr)
 		{
+			id = issuercert->get_subject(issuercert);
 			hasher = lib->crypto->create_hasher(lib->crypto,
 							hasher_algorithm_from_oid(response->hashAlgorithm));
-			if (!hasher)
+			if (!hasher ||
+				!hasher->allocate_hash(hasher, id->get_encoding(id), &hash))
 			{
+				DESTROY_IF(hasher);
 				continue;
 			}
-			id = issuercert->get_subject(issuercert);
-			hasher->allocate_hash(hasher, id->get_encoding(id), &hash);
 			hasher->destroy(hasher);
 			if (!chunk_equals(hash, response->issuerNameHash))
 			{
+				free(hash.ptr);
 				continue;
 			}
+			free(hash.ptr);
 		}
 		else
 		{
diff --git a/src/libtls/tls_crypto.c b/src/libtls/tls_crypto.c
index 65a868208..820ae74de 100644
--- a/src/libtls/tls_crypto.c
+++ b/src/libtls/tls_crypto.c
@@ -1196,12 +1196,12 @@ static bool hash_data(private_tls_crypto_t *this, chunk_t data, chunk_t *hash)
 			return FALSE;
 		}
 		hasher = lib->crypto->create_hasher(lib->crypto, alg->hash);
-		if (!hasher)
+		if (!hasher || !hasher->allocate_hash(hasher, data, hash))
 		{
 			DBG1(DBG_TLS, "%N not supported", hash_algorithm_names, alg->hash);
+			DESTROY_IF(hasher);
 			return FALSE;
 		}
-		hasher->allocate_hash(hasher, data, hash);
 		hasher->destroy(hasher);
 	}
 	else
diff --git a/src/medsrv/controller/user_controller.c b/src/medsrv/controller/user_controller.c
index 12bd938fe..35c9d90c8 100644
--- a/src/medsrv/controller/user_controller.c
+++ b/src/medsrv/controller/user_controller.c
@@ -64,7 +64,11 @@ static chunk_t hash_password(char *login, char *password)
 	}
 	data = chunk_cata("cc",	chunk_create(login, strlen(login)),
 							chunk_create(password, strlen(password)));
-	hasher->allocate_hash(hasher, data, &hash);
+	if (!hasher->allocate_hash(hasher, data, &hash))
+	{
+		hasher->destroy(hasher);
+		return chunk_empty;
+	}
 	hasher->destroy(hasher);
 	return hash;
 }