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[CRYPTO] hash: Add asynchronous hash support
This patch adds asynchronous hash and digest support. Signed-off-by: Loc Ho <lho@amcc.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Loc Ho
Herbert Xu
parent
534fe2c1c3
commit
004a403c2e
8 changed files with 507 additions and 15 deletions
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@ -19,6 +19,7 @@ obj-$(CONFIG_CRYPTO_BLKCIPHER) += crypto_blkcipher.o
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obj-$(CONFIG_CRYPTO_SEQIV) += seqiv.o
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crypto_hash-objs := hash.o
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crypto_hash-objs += ahash.o
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obj-$(CONFIG_CRYPTO_HASH) += crypto_hash.o
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obj-$(CONFIG_CRYPTO_MANAGER) += cryptomgr.o
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106
crypto/ahash.c
Normal file
106
crypto/ahash.c
Normal file
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@ -0,0 +1,106 @@
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/*
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* Asynchronous Cryptographic Hash operations.
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*
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* This is the asynchronous version of hash.c with notification of
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* completion via a callback.
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*
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* Copyright (c) 2008 Loc Ho <lho@amcc.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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*/
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#include <crypto/algapi.h>
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#include <linux/err.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/seq_file.h>
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#include "internal.h"
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static int ahash_setkey_unaligned(struct crypto_ahash *tfm, const u8 *key,
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unsigned int keylen)
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{
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struct ahash_alg *ahash = crypto_ahash_alg(tfm);
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unsigned long alignmask = crypto_ahash_alignmask(tfm);
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int ret;
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u8 *buffer, *alignbuffer;
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unsigned long absize;
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absize = keylen + alignmask;
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buffer = kmalloc(absize, GFP_ATOMIC);
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if (!buffer)
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return -ENOMEM;
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alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
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memcpy(alignbuffer, key, keylen);
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ret = ahash->setkey(tfm, alignbuffer, keylen);
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memset(alignbuffer, 0, keylen);
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kfree(buffer);
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return ret;
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}
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static int ahash_setkey(struct crypto_ahash *tfm, const u8 *key,
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unsigned int keylen)
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{
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struct ahash_alg *ahash = crypto_ahash_alg(tfm);
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unsigned long alignmask = crypto_ahash_alignmask(tfm);
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if ((unsigned long)key & alignmask)
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return ahash_setkey_unaligned(tfm, key, keylen);
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return ahash->setkey(tfm, key, keylen);
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}
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static unsigned int crypto_ahash_ctxsize(struct crypto_alg *alg, u32 type,
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u32 mask)
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{
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return alg->cra_ctxsize;
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}
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static int crypto_init_ahash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
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{
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struct ahash_alg *alg = &tfm->__crt_alg->cra_ahash;
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struct ahash_tfm *crt = &tfm->crt_ahash;
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if (alg->digestsize > crypto_tfm_alg_blocksize(tfm))
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return -EINVAL;
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crt->init = alg->init;
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crt->update = alg->update;
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crt->final = alg->final;
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crt->digest = alg->digest;
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crt->setkey = ahash_setkey;
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crt->base = __crypto_ahash_cast(tfm);
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crt->digestsize = alg->digestsize;
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return 0;
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}
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static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
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__attribute__ ((unused));
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static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
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{
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seq_printf(m, "type : ahash\n");
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seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
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"yes" : "no");
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seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
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seq_printf(m, "digestsize : %u\n", alg->cra_hash.digestsize);
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}
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const struct crypto_type crypto_ahash_type = {
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.ctxsize = crypto_ahash_ctxsize,
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.init = crypto_init_ahash_ops,
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#ifdef CONFIG_PROC_FS
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.show = crypto_ahash_show,
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#endif
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};
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EXPORT_SYMBOL_GPL(crypto_ahash_type);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Asynchronous cryptographic hash type");
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@ -235,8 +235,12 @@ static int crypto_init_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
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return crypto_init_cipher_ops(tfm);
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case CRYPTO_ALG_TYPE_DIGEST:
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return crypto_init_digest_ops(tfm);
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if ((mask & CRYPTO_ALG_TYPE_HASH_MASK) !=
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CRYPTO_ALG_TYPE_HASH_MASK)
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return crypto_init_digest_ops_async(tfm);
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else
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return crypto_init_digest_ops(tfm);
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case CRYPTO_ALG_TYPE_COMPRESS:
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return crypto_init_compress_ops(tfm);
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@ -157,3 +157,84 @@ int crypto_init_digest_ops(struct crypto_tfm *tfm)
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void crypto_exit_digest_ops(struct crypto_tfm *tfm)
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{
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}
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static int digest_async_nosetkey(struct crypto_ahash *tfm_async, const u8 *key,
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unsigned int keylen)
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{
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crypto_ahash_clear_flags(tfm_async, CRYPTO_TFM_RES_MASK);
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return -ENOSYS;
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}
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static int digest_async_setkey(struct crypto_ahash *tfm_async, const u8 *key,
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unsigned int keylen)
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{
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struct crypto_tfm *tfm = crypto_ahash_tfm(tfm_async);
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struct digest_alg *dalg = &tfm->__crt_alg->cra_digest;
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crypto_ahash_clear_flags(tfm_async, CRYPTO_TFM_RES_MASK);
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return dalg->dia_setkey(tfm, key, keylen);
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}
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static int digest_async_init(struct ahash_request *req)
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{
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struct crypto_tfm *tfm = req->base.tfm;
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struct digest_alg *dalg = &tfm->__crt_alg->cra_digest;
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dalg->dia_init(tfm);
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return 0;
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}
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static int digest_async_update(struct ahash_request *req)
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{
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struct crypto_tfm *tfm = req->base.tfm;
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struct hash_desc desc = {
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.tfm = __crypto_hash_cast(tfm),
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.flags = req->base.flags,
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};
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update(&desc, req->src, req->nbytes);
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return 0;
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}
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static int digest_async_final(struct ahash_request *req)
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{
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struct crypto_tfm *tfm = req->base.tfm;
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struct hash_desc desc = {
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.tfm = __crypto_hash_cast(tfm),
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.flags = req->base.flags,
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};
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final(&desc, req->result);
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return 0;
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}
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static int digest_async_digest(struct ahash_request *req)
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{
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struct crypto_tfm *tfm = req->base.tfm;
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struct hash_desc desc = {
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.tfm = __crypto_hash_cast(tfm),
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.flags = req->base.flags,
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};
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return digest(&desc, req->src, req->nbytes, req->result);
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}
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int crypto_init_digest_ops_async(struct crypto_tfm *tfm)
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{
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struct ahash_tfm *crt = &tfm->crt_ahash;
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struct digest_alg *dalg = &tfm->__crt_alg->cra_digest;
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if (dalg->dia_digestsize > crypto_tfm_alg_blocksize(tfm))
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return -EINVAL;
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crt->init = digest_async_init;
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crt->update = digest_async_update;
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crt->final = digest_async_final;
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crt->digest = digest_async_digest;
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crt->setkey = dalg->dia_setkey ? digest_async_setkey :
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digest_async_nosetkey;
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crt->digestsize = dalg->dia_digestsize;
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crt->base = __crypto_ahash_cast(tfm);
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return 0;
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}
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102
crypto/hash.c
102
crypto/hash.c
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@ -59,22 +59,106 @@ static int hash_setkey(struct crypto_hash *crt, const u8 *key,
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return alg->setkey(crt, key, keylen);
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}
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static int crypto_init_hash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
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static int hash_async_setkey(struct crypto_ahash *tfm_async, const u8 *key,
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unsigned int keylen)
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{
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struct crypto_tfm *tfm = crypto_ahash_tfm(tfm_async);
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struct crypto_hash *tfm_hash = __crypto_hash_cast(tfm);
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struct hash_alg *alg = &tfm->__crt_alg->cra_hash;
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return alg->setkey(tfm_hash, key, keylen);
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}
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static int hash_async_init(struct ahash_request *req)
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{
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struct crypto_tfm *tfm = req->base.tfm;
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struct hash_alg *alg = &tfm->__crt_alg->cra_hash;
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struct hash_desc desc = {
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.tfm = __crypto_hash_cast(tfm),
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.flags = req->base.flags,
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};
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return alg->init(&desc);
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}
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static int hash_async_update(struct ahash_request *req)
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{
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struct crypto_tfm *tfm = req->base.tfm;
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struct hash_alg *alg = &tfm->__crt_alg->cra_hash;
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struct hash_desc desc = {
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.tfm = __crypto_hash_cast(tfm),
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.flags = req->base.flags,
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};
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return alg->update(&desc, req->src, req->nbytes);
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}
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static int hash_async_final(struct ahash_request *req)
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{
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struct crypto_tfm *tfm = req->base.tfm;
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struct hash_alg *alg = &tfm->__crt_alg->cra_hash;
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struct hash_desc desc = {
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.tfm = __crypto_hash_cast(tfm),
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.flags = req->base.flags,
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};
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return alg->final(&desc, req->result);
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}
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static int hash_async_digest(struct ahash_request *req)
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{
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struct crypto_tfm *tfm = req->base.tfm;
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struct hash_alg *alg = &tfm->__crt_alg->cra_hash;
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struct hash_desc desc = {
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.tfm = __crypto_hash_cast(tfm),
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.flags = req->base.flags,
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};
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return alg->digest(&desc, req->src, req->nbytes, req->result);
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}
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static int crypto_init_hash_ops_async(struct crypto_tfm *tfm)
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{
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struct ahash_tfm *crt = &tfm->crt_ahash;
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struct hash_alg *alg = &tfm->__crt_alg->cra_hash;
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crt->init = hash_async_init;
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crt->update = hash_async_update;
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crt->final = hash_async_final;
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crt->digest = hash_async_digest;
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crt->setkey = hash_async_setkey;
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crt->digestsize = alg->digestsize;
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crt->base = __crypto_ahash_cast(tfm);
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return 0;
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}
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static int crypto_init_hash_ops_sync(struct crypto_tfm *tfm)
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{
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struct hash_tfm *crt = &tfm->crt_hash;
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struct hash_alg *alg = &tfm->__crt_alg->cra_hash;
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crt->init = alg->init;
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crt->update = alg->update;
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crt->final = alg->final;
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crt->digest = alg->digest;
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crt->setkey = hash_setkey;
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crt->digestsize = alg->digestsize;
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return 0;
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}
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static int crypto_init_hash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
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{
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struct hash_alg *alg = &tfm->__crt_alg->cra_hash;
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if (alg->digestsize > crypto_tfm_alg_blocksize(tfm))
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return -EINVAL;
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crt->init = alg->init;
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crt->update = alg->update;
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crt->final = alg->final;
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crt->digest = alg->digest;
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crt->setkey = hash_setkey;
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crt->digestsize = alg->digestsize;
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return 0;
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if ((mask & CRYPTO_ALG_TYPE_HASH_MASK) != CRYPTO_ALG_TYPE_HASH_MASK)
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return crypto_init_hash_ops_async(tfm);
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else
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return crypto_init_hash_ops_sync(tfm);
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}
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static void crypto_hash_show(struct seq_file *m, struct crypto_alg *alg)
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@ -86,6 +86,7 @@ struct crypto_alg *__crypto_alg_lookup(const char *name, u32 type, u32 mask);
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struct crypto_alg *crypto_alg_mod_lookup(const char *name, u32 type, u32 mask);
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int crypto_init_digest_ops(struct crypto_tfm *tfm);
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int crypto_init_digest_ops_async(struct crypto_tfm *tfm);
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int crypto_init_cipher_ops(struct crypto_tfm *tfm);
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int crypto_init_compress_ops(struct crypto_tfm *tfm);
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@ -98,6 +98,7 @@ extern const struct crypto_type crypto_ablkcipher_type;
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extern const struct crypto_type crypto_aead_type;
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extern const struct crypto_type crypto_blkcipher_type;
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extern const struct crypto_type crypto_hash_type;
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extern const struct crypto_type crypto_ahash_type;
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void crypto_mod_put(struct crypto_alg *alg);
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@ -314,5 +315,40 @@ static inline int crypto_requires_sync(u32 type, u32 mask)
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return (type ^ CRYPTO_ALG_ASYNC) & mask & CRYPTO_ALG_ASYNC;
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}
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static inline void *crypto_ahash_ctx(struct crypto_ahash *tfm)
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{
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return crypto_tfm_ctx(&tfm->base);
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}
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static inline struct ahash_alg *crypto_ahash_alg(
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struct crypto_ahash *tfm)
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{
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return &crypto_ahash_tfm(tfm)->__crt_alg->cra_ahash;
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}
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static inline int ahash_enqueue_request(struct crypto_queue *queue,
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struct ahash_request *request)
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{
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return crypto_enqueue_request(queue, &request->base);
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}
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static inline struct ahash_request *ahash_dequeue_request(
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struct crypto_queue *queue)
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{
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return ahash_request_cast(crypto_dequeue_request(queue));
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}
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static inline void *ahash_request_ctx(struct ahash_request *req)
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{
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return req->__ctx;
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}
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static inline int ahash_tfm_in_queue(struct crypto_queue *queue,
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struct crypto_ahash *tfm)
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{
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return crypto_tfm_in_queue(queue, crypto_ahash_tfm(tfm));
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}
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#endif /* _CRYPTO_ALGAPI_H */
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@ -30,15 +30,17 @@
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*/
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#define CRYPTO_ALG_TYPE_MASK 0x0000000f
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#define CRYPTO_ALG_TYPE_CIPHER 0x00000001
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#define CRYPTO_ALG_TYPE_DIGEST 0x00000002
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#define CRYPTO_ALG_TYPE_HASH 0x00000003
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#define CRYPTO_ALG_TYPE_COMPRESS 0x00000002
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#define CRYPTO_ALG_TYPE_AEAD 0x00000003
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#define CRYPTO_ALG_TYPE_BLKCIPHER 0x00000004
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#define CRYPTO_ALG_TYPE_ABLKCIPHER 0x00000005
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#define CRYPTO_ALG_TYPE_GIVCIPHER 0x00000006
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#define CRYPTO_ALG_TYPE_COMPRESS 0x00000008
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#define CRYPTO_ALG_TYPE_AEAD 0x00000009
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#define CRYPTO_ALG_TYPE_DIGEST 0x00000008
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#define CRYPTO_ALG_TYPE_HASH 0x00000009
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#define CRYPTO_ALG_TYPE_AHASH 0x0000000a
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#define CRYPTO_ALG_TYPE_HASH_MASK 0x0000000e
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#define CRYPTO_ALG_TYPE_AHASH_MASK 0x0000000c
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#define CRYPTO_ALG_TYPE_BLKCIPHER_MASK 0x0000000c
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#define CRYPTO_ALG_LARVAL 0x00000010
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@ -102,6 +104,7 @@ struct crypto_async_request;
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struct crypto_aead;
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struct crypto_blkcipher;
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struct crypto_hash;
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struct crypto_ahash;
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struct crypto_tfm;
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struct crypto_type;
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struct aead_givcrypt_request;
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@ -131,6 +134,18 @@ struct ablkcipher_request {
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void *__ctx[] CRYPTO_MINALIGN_ATTR;
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};
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struct ahash_request {
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struct crypto_async_request base;
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void *info;
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unsigned int nbytes;
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struct scatterlist *src;
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u8 *result;
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void *__ctx[] CRYPTO_MINALIGN_ATTR;
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};
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/**
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* struct aead_request - AEAD request
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* @base: Common attributes for async crypto requests
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||||
|
|
@ -195,6 +210,17 @@ struct ablkcipher_alg {
|
|||
unsigned int ivsize;
|
||||
};
|
||||
|
||||
struct ahash_alg {
|
||||
int (*init)(struct ahash_request *req);
|
||||
int (*update)(struct ahash_request *req);
|
||||
int (*final)(struct ahash_request *req);
|
||||
int (*digest)(struct ahash_request *req);
|
||||
int (*setkey)(struct crypto_ahash *tfm, const u8 *key,
|
||||
unsigned int keylen);
|
||||
|
||||
unsigned int digestsize;
|
||||
};
|
||||
|
||||
struct aead_alg {
|
||||
int (*setkey)(struct crypto_aead *tfm, const u8 *key,
|
||||
unsigned int keylen);
|
||||
|
|
@ -272,6 +298,7 @@ struct compress_alg {
|
|||
#define cra_cipher cra_u.cipher
|
||||
#define cra_digest cra_u.digest
|
||||
#define cra_hash cra_u.hash
|
||||
#define cra_ahash cra_u.ahash
|
||||
#define cra_compress cra_u.compress
|
||||
|
||||
struct crypto_alg {
|
||||
|
|
@ -298,6 +325,7 @@ struct crypto_alg {
|
|||
struct cipher_alg cipher;
|
||||
struct digest_alg digest;
|
||||
struct hash_alg hash;
|
||||
struct ahash_alg ahash;
|
||||
struct compress_alg compress;
|
||||
} cra_u;
|
||||
|
||||
|
|
@ -383,6 +411,19 @@ struct hash_tfm {
|
|||
unsigned int digestsize;
|
||||
};
|
||||
|
||||
struct ahash_tfm {
|
||||
int (*init)(struct ahash_request *req);
|
||||
int (*update)(struct ahash_request *req);
|
||||
int (*final)(struct ahash_request *req);
|
||||
int (*digest)(struct ahash_request *req);
|
||||
int (*setkey)(struct crypto_ahash *tfm, const u8 *key,
|
||||
unsigned int keylen);
|
||||
|
||||
unsigned int digestsize;
|
||||
struct crypto_ahash *base;
|
||||
unsigned int reqsize;
|
||||
};
|
||||
|
||||
struct compress_tfm {
|
||||
int (*cot_compress)(struct crypto_tfm *tfm,
|
||||
const u8 *src, unsigned int slen,
|
||||
|
|
@ -397,6 +438,7 @@ struct compress_tfm {
|
|||
#define crt_blkcipher crt_u.blkcipher
|
||||
#define crt_cipher crt_u.cipher
|
||||
#define crt_hash crt_u.hash
|
||||
#define crt_ahash crt_u.ahash
|
||||
#define crt_compress crt_u.compress
|
||||
|
||||
struct crypto_tfm {
|
||||
|
|
@ -409,6 +451,7 @@ struct crypto_tfm {
|
|||
struct blkcipher_tfm blkcipher;
|
||||
struct cipher_tfm cipher;
|
||||
struct hash_tfm hash;
|
||||
struct ahash_tfm ahash;
|
||||
struct compress_tfm compress;
|
||||
} crt_u;
|
||||
|
||||
|
|
@ -441,6 +484,10 @@ struct crypto_hash {
|
|||
struct crypto_tfm base;
|
||||
};
|
||||
|
||||
struct crypto_ahash {
|
||||
struct crypto_tfm base;
|
||||
};
|
||||
|
||||
enum {
|
||||
CRYPTOA_UNSPEC,
|
||||
CRYPTOA_ALG,
|
||||
|
|
@ -1264,5 +1311,137 @@ static inline int crypto_comp_decompress(struct crypto_comp *tfm,
|
|||
src, slen, dst, dlen);
|
||||
}
|
||||
|
||||
static inline struct crypto_ahash *__crypto_ahash_cast(struct crypto_tfm *tfm)
|
||||
{
|
||||
return (struct crypto_ahash *)tfm;
|
||||
}
|
||||
|
||||
static inline struct crypto_ahash *crypto_alloc_ahash(const char *alg_name,
|
||||
u32 type, u32 mask)
|
||||
{
|
||||
type &= ~CRYPTO_ALG_TYPE_MASK;
|
||||
mask &= ~CRYPTO_ALG_TYPE_MASK;
|
||||
type |= CRYPTO_ALG_TYPE_AHASH;
|
||||
mask |= CRYPTO_ALG_TYPE_AHASH_MASK;
|
||||
|
||||
return __crypto_ahash_cast(crypto_alloc_base(alg_name, type, mask));
|
||||
}
|
||||
|
||||
static inline struct crypto_tfm *crypto_ahash_tfm(struct crypto_ahash *tfm)
|
||||
{
|
||||
return &tfm->base;
|
||||
}
|
||||
|
||||
static inline void crypto_free_ahash(struct crypto_ahash *tfm)
|
||||
{
|
||||
crypto_free_tfm(crypto_ahash_tfm(tfm));
|
||||
}
|
||||
|
||||
static inline unsigned int crypto_ahash_alignmask(
|
||||
struct crypto_ahash *tfm)
|
||||
{
|
||||
return crypto_tfm_alg_alignmask(crypto_ahash_tfm(tfm));
|
||||
}
|
||||
|
||||
static inline struct ahash_tfm *crypto_ahash_crt(struct crypto_ahash *tfm)
|
||||
{
|
||||
return &crypto_ahash_tfm(tfm)->crt_ahash;
|
||||
}
|
||||
|
||||
static inline unsigned int crypto_ahash_digestsize(struct crypto_ahash *tfm)
|
||||
{
|
||||
return crypto_ahash_crt(tfm)->digestsize;
|
||||
}
|
||||
|
||||
static inline u32 crypto_ahash_get_flags(struct crypto_ahash *tfm)
|
||||
{
|
||||
return crypto_tfm_get_flags(crypto_ahash_tfm(tfm));
|
||||
}
|
||||
|
||||
static inline void crypto_ahash_set_flags(struct crypto_ahash *tfm, u32 flags)
|
||||
{
|
||||
crypto_tfm_set_flags(crypto_ahash_tfm(tfm), flags);
|
||||
}
|
||||
|
||||
static inline void crypto_ahash_clear_flags(struct crypto_ahash *tfm, u32 flags)
|
||||
{
|
||||
crypto_tfm_clear_flags(crypto_ahash_tfm(tfm), flags);
|
||||
}
|
||||
|
||||
static inline struct crypto_ahash *crypto_ahash_reqtfm(
|
||||
struct ahash_request *req)
|
||||
{
|
||||
return __crypto_ahash_cast(req->base.tfm);
|
||||
}
|
||||
|
||||
static inline unsigned int crypto_ahash_reqsize(struct crypto_ahash *tfm)
|
||||
{
|
||||
return crypto_ahash_crt(tfm)->reqsize;
|
||||
}
|
||||
|
||||
static inline int crypto_ahash_setkey(struct crypto_ahash *tfm,
|
||||
const u8 *key, unsigned int keylen)
|
||||
{
|
||||
struct ahash_tfm *crt = crypto_ahash_crt(tfm);
|
||||
|
||||
return crt->setkey(crt->base, key, keylen);
|
||||
}
|
||||
|
||||
static inline int crypto_ahash_digest(struct ahash_request *req)
|
||||
{
|
||||
struct ahash_tfm *crt = crypto_ahash_crt(crypto_ahash_reqtfm(req));
|
||||
return crt->digest(req);
|
||||
}
|
||||
|
||||
static inline void ahash_request_set_tfm(struct ahash_request *req,
|
||||
struct crypto_ahash *tfm)
|
||||
{
|
||||
req->base.tfm = crypto_ahash_tfm(crypto_ahash_crt(tfm)->base);
|
||||
}
|
||||
|
||||
static inline struct ahash_request *ahash_request_alloc(
|
||||
struct crypto_ahash *tfm, gfp_t gfp)
|
||||
{
|
||||
struct ahash_request *req;
|
||||
|
||||
req = kmalloc(sizeof(struct ahash_request) +
|
||||
crypto_ahash_reqsize(tfm), gfp);
|
||||
|
||||
if (likely(req))
|
||||
ahash_request_set_tfm(req, tfm);
|
||||
|
||||
return req;
|
||||
}
|
||||
|
||||
static inline void ahash_request_free(struct ahash_request *req)
|
||||
{
|
||||
kfree(req);
|
||||
}
|
||||
|
||||
static inline struct ahash_request *ahash_request_cast(
|
||||
struct crypto_async_request *req)
|
||||
{
|
||||
return container_of(req, struct ahash_request, base);
|
||||
}
|
||||
|
||||
static inline void ahash_request_set_callback(struct ahash_request *req,
|
||||
u32 flags,
|
||||
crypto_completion_t complete,
|
||||
void *data)
|
||||
{
|
||||
req->base.complete = complete;
|
||||
req->base.data = data;
|
||||
req->base.flags = flags;
|
||||
}
|
||||
|
||||
static inline void ahash_request_set_crypt(struct ahash_request *req,
|
||||
struct scatterlist *src, u8 *result,
|
||||
unsigned int nbytes)
|
||||
{
|
||||
req->src = src;
|
||||
req->nbytes = nbytes;
|
||||
req->result = result;
|
||||
}
|
||||
|
||||
#endif /* _LINUX_CRYPTO_H */
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue