cryptographic-functions-transact-sql.md

title	Cryptographic Functions (Transact-SQL) | Microsoft Docs
ms.custom
ms.date	07/24/2017
ms.prod	sql-non-specified
ms.prod_service	database-engine, sql-database
ms.service
ms.component	t-sql|functions
ms.reviewer
ms.suite	sql
ms.technology	database-engine
ms.tgt_pltfrm
ms.topic	language-reference
dev_langs	TSQL
helpviewer_keywords	functions [SQL Server], cryptographic crypto functions cryptography [SQL Server], functions decryption [SQL Server], functions security functions encryption [SQL Server], functions
ms.assetid	0be5626b-5a25-4d8c-9f44-7abbfccf816c
caps.latest.revision	16
author	edmacauley
ms.author	edmaca
manager	cguyer
ms.workload	On Demand

Cryptographic functions (Transact-SQL)

[!INCLUDEtsql-appliesto-ss2008-asdb-xxxx-xxx-md]

The following functions support encryption, decryption, digital signing, and the validation of digital signatures.

Symmetric encryption and decryption

ENCRYPTBYKEY	DECRYPTBYKEY
ENCRYPTBYPASSPHRASE	DECRYPTBYPASSPHRASE
KEY_ID	KEY_GUID
DECRYPTBYKEYAUTOASYMKEY	KEY_NAME
SYMKEYPROPERTY

Asymmetric encryption and decryption

ENCRYPTBYASYMKEY	DECRYPTBYASYMKEY
ENCRYPTBYCert	DECRYPTBYCERT
ASYMKEYPROPERTY	ASYMKEY_ID

Signing and signature verification

SIGNBYASYMKEY	VERIFYSIGNEDBYASMKEY
SIGNBYCERT	VERIGYSIGNEDBYCERT
IS_OBJECTSIGNED

Symmetric decryption with automatic key handling

DecryptByKeyAutoCert

Encryption hashing

HASHBYTES

Copying certificates

CERTENCODED (Transact-SQL)
CERTPRIVATEKEY (Transact-SQL)

See also

Functions
Encryption Hierarchy
Permissions Hierarchy (Database Engine)
CREATE CERTIFICATE (Transact-SQL)
CREATE SYMMETRIC KEY (Transact-SQL)
CREATE ASYMMETRIC KEY (Transact-SQL)
Security Catalog Views (Transact-SQL)