EVP_sha1.3ossl - Man Page

 #include <openssl/evp.h>

 const EVP_MD *EVP_sha1(void);

SHA-1 (Secure Hash Algorithm 1) is a cryptographic hash function standardized in NIST FIPS 180-4. The algorithm was designed by the United States National Security Agency and initially published in 1995.

EVP_sha1()

The SHA-1 algorithm which produces a 160-bit output from a given input.

Developers should be aware of the negative performance implications of calling this function multiple times and should consider using EVP_MD_fetch(3) with EVP_MD-SHA1(7) instead. See "Performance" in crypto(7) for further information.

These functions return a EVP_MD structure that contains the implementation of the message digest. See EVP_MD_meth_new(3) for details of the EVP_MD structure.

NIST FIPS 180-4.

evp(7), EVP_DigestInit(3)

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Licensed under the Apache License 2.0 (the "License").  You may not use this file except in compliance with the License.  You can obtain a copy in the file LICENSE in the source distribution or at <https://www.openssl.org/source/license.html>.

EVP_DigestInit.3ossl(3), X509_digest.3ossl(3).