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Function SHA1Hash

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Calculates SHA-1 hash.







Code (Delphi)

function SHA1Hash(

const AData: Pointer;

const ADataSize: Cardinal

): TSHA1Hash; overload;


function SHA1Hash(

const AData: RawByteString

): TSHA1Hash; overload;



AData [in]

A data to calculate hash.


ADataSize [in]

Size of AData in bytes.


Return value

SHA-1 hash of the specified AData.



SHA-1 (Secure Hash Algorithm 1) is a cryptographic hash function. SHA-1 produces a 160-bit (20-byte) hash value known as a message digest. A SHA-1 hash value is typically rendered as a hexadecimal number, 40 digits long.


SHA-1 forms part of several widely used security applications and protocols, including TLS and SSL, PGP, SSH, S/MIME, and IPsec. SHA-1 hashing is also used in distributed revision control systems like Git, Mercurial, and Monotone to identify revisions, and to detect data corruption or tampering.



SHA-1 is considered insecure against well-funded opponents. It is recommended to use SHA-2 or SHA-3 instead. Microsoft, Google and Mozilla have all announced that their respective browsers will stop accepting SHA-1 SSL certificates by 2017. Windows XP SP2 and earlier, and Android 2.2 and earlier, do not support SHA2 certificates.


See also

Send feedback... Build date: 2022-03-28
Last edited: 2022-03-28
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