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c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1729610680; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=fCIjd5XoRAWklxpBwC1ESO697qS5sCLzfEo5E37CLA4=; b=EJNIdQGRXPP1HNrt+clHZJCcUTAZKVtfBn0W1jwRJzyZq4Z/aK2wsHjh5eJ4UHAxLLRPfX QYRPZYY5s7ylaFhYTEq/Ulcnij6PSHTofQh+K0je67QbV+5BzPrHbCL6B6v/t50f8F0GfD 9YH32UbhqwZDNd6f+ciOHgrVlnXd06E= X-MC-Unique: PVTZbQKBOumCMi9E6WTfhA-1 From: =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= To: qemu-devel@nongnu.org Cc: Wainer dos Santos Moschetta , =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= , =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Thomas Huth , =?UTF-8?q?Alex=20Benn=C3=A9e?= , Dorjoy Chowdhury Subject: [PULL 06/14] include/crypto: clarify @result/@result_len for hash/hmac APIs Date: Tue, 22 Oct 2024 16:24:07 +0100 Message-ID: <20241022152415.1632556-7-berrange@redhat.com> In-Reply-To: <20241022152415.1632556-1-berrange@redhat.com> References: <20241022152415.1632556-1-berrange@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.133.124; envelope-from=berrange@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -25 X-Spam_score: -2.6 X-Spam_bar: -- X-Spam_report: (-2.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.519, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1729610793363116600 The @result parameter passed to hash/hmac APIs may either contain a pre-allocated buffer, or a buffer can be allocated on the fly. Clarify these two different usage models in the API docs. Reviewed-by: Dorjoy Chowdhury Signed-off-by: Daniel P. Berrang=C3=A9 --- include/crypto/hash.h | 47 ++++++++++++++++++++++++++++++++----------- include/crypto/hmac.h | 34 ++++++++++++++++++++++--------- 2 files changed, 59 insertions(+), 22 deletions(-) diff --git a/include/crypto/hash.h b/include/crypto/hash.h index b791ca92a4..712cac79ee 100644 --- a/include/crypto/hash.h +++ b/include/crypto/hash.h @@ -73,11 +73,18 @@ size_t qcrypto_hash_digest_len(QCryptoHashAlgo alg); * @errp: pointer to a NULL-initialized error object * * Computes the hash across all the memory regions - * present in @iov. The @result pointer will be - * filled with raw bytes representing the computed - * hash, which will have length @resultlen. The - * memory pointer in @result must be released - * with a call to g_free() when no longer required. + * present in @iov. + * + * If @result_len is set to a non-zero value by the caller, then + * @result must hold a pointer that is @result_len in size, and + * @result_len match the size of the hash output. The digest will + * be written into @result. + * + * If @result_len is set to zero, then this function will allocate + * a buffer to hold the hash output digest, storing a pointer to + * the buffer in @result, and setting @result_len to its size. + * The memory referenced in @result must be released with a call + * to g_free() when no longer required by the caller. * * Returns: 0 on success, -1 on error */ @@ -98,11 +105,18 @@ int qcrypto_hash_bytesv(QCryptoHashAlgo alg, * @errp: pointer to a NULL-initialized error object * * Computes the hash across all the memory region - * @buf of length @len. The @result pointer will be - * filled with raw bytes representing the computed - * hash, which will have length @resultlen. The - * memory pointer in @result must be released - * with a call to g_free() when no longer required. + * @buf of length @len. + * + * If @result_len is set to a non-zero value by the caller, then + * @result must hold a pointer that is @result_len in size, and + * @result_len match the size of the hash output. The digest will + * be written into @result. + * + * If @result_len is set to zero, then this function will allocate + * a buffer to hold the hash output digest, storing a pointer to + * the buffer in @result, and setting @result_len to its size. + * The memory referenced in @result must be released with a call + * to g_free() when no longer required by the caller. * * Returns: 0 on success, -1 on error */ @@ -215,8 +229,17 @@ int qcrypto_hash_finalize_base64(QCryptoHash *hash, * * Computes the hash from the given hash object. Hash object * is expected to have it's data updated from the qcrypto_hash_update func= tion. - * The memory pointer in @result must be released with a call to g_free() - * when no longer required. + * + * If @result_len is set to a non-zero value by the caller, then + * @result must hold a pointer that is @result_len in size, and + * @result_len match the size of the hash output. The digest will + * be written into @result. + * + * If @result_len is set to zero, then this function will allocate + * a buffer to hold the hash output digest, storing a pointer to + * the buffer in @result, and setting @result_len to its size. + * The memory referenced in @result must be released with a call + * to g_free() when no longer required by the caller. * * Returns: 0 on success, -1 on error */ diff --git a/include/crypto/hmac.h b/include/crypto/hmac.h index c69a0dfab3..da8a1e3ceb 100644 --- a/include/crypto/hmac.h +++ b/include/crypto/hmac.h @@ -77,11 +77,18 @@ G_DEFINE_AUTOPTR_CLEANUP_FUNC(QCryptoHmac, qcrypto_hmac= _free) * @errp: pointer to a NULL-initialized error object * * Computes the hmac across all the memory regions - * present in @iov. The @result pointer will be - * filled with raw bytes representing the computed - * hmac, which will have length @resultlen. The - * memory pointer in @result must be released - * with a call to g_free() when no longer required. + * present in @iov. + * + * If @result_len is set to a non-zero value by the caller, then + * @result must hold a pointer that is @result_len in size, and + * @result_len match the size of the hash output. The digest will + * be written into @result. + * + * If @result_len is set to zero, then this function will allocate + * a buffer to hold the hash output digest, storing a pointer to + * the buffer in @result, and setting @result_len to its size. + * The memory referenced in @result must be released with a call + * to g_free() when no longer required by the caller. * * Returns: * 0 on success, -1 on error @@ -103,11 +110,18 @@ int qcrypto_hmac_bytesv(QCryptoHmac *hmac, * @errp: pointer to a NULL-initialized error object * * Computes the hmac across all the memory region - * @buf of length @len. The @result pointer will be - * filled with raw bytes representing the computed - * hmac, which will have length @resultlen. The - * memory pointer in @result must be released - * with a call to g_free() when no longer required. + * @buf of length @len. + * + * If @result_len is set to a non-zero value by the caller, then + * @result must hold a pointer that is @result_len in size, and + * @result_len match the size of the hash output. The digest will + * be written into @result. + * + * If @result_len is set to zero, then this function will allocate + * a buffer to hold the hash output digest, storing a pointer to + * the buffer in @result, and setting @result_len to its size. + * The memory referenced in @result must be released with a call + * to g_free() when no longer required by the caller. * * Returns: * 0 on success, -1 on error --=20 2.46.0