=pod =head1 NAME EVP_sha224, EVP_sha256, EVP_sha512_224, EVP_sha512_256, EVP_sha384, EVP_sha512 - SHA-2 For EVP =head1 SYNOPSIS #include const EVP_MD *EVP_sha224(void); const EVP_MD *EVP_sha256(void); const EVP_MD *EVP_sha512_224(void); const EVP_MD *EVP_sha512_256(void); const EVP_MD *EVP_sha384(void); const EVP_MD *EVP_sha512(void); =head1 DESCRIPTION SHA-2 (Secure Hash Algorithm 2) is a family of cryptographic hash functions standardized in NIST FIPS 180-4, first published in 2001. =over 4 =item EVP_sha224(), EVP_sha256(), EVP_sha512_224, EVP_sha512_256, EVP_sha384(), EVP_sha512() The SHA-2 SHA-224, SHA-256, SHA-512/224, SHA512/256, SHA-384 and SHA-512 algorithms, which generate 224, 256, 224, 256, 384 and 512 bits respectively of output from a given input. The two algorithms: SHA-512/224 and SHA512/256 are truncated forms of the SHA-512 algorithm. They are distinct from SHA-224 and SHA-256 even though their outputs are of the same size. =back =head1 NOTES Developers should be aware of the negative performance implications of calling these functions multiple times and should consider using L instead. See L for further information. =head1 RETURN VALUES These functions return a B structure that contains the implementation of the message digest. See L for details of the B structure. =head1 CONFORMING TO NIST FIPS 180-4. =head1 SEE ALSO L, L =head1 COPYRIGHT Copyright 2017-2023 The OpenSSL Project Authors. All Rights Reserved. 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 L. =cut