cryptographic-functions-transact-sql.md

title	Cryptographic Functions (Transact-SQL) | Microsoft Docs
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ms.date	07/24/2017
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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
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Cryptographic functions (Transact-SQL)

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

These functions support digital signing, digital signature validation, encryption, and decryption.

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

Certificate copying

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)