EVP_sha224, EVP_sha256, EVP_sha512_224, EVP_sha512_256, EVP_sha384, EVP_sha512 - SHA-2 For EVP
#include <openssl/evp.h>
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);SHA-2 (Secure Hash Algorithm 2) is a family of cryptographic hash functions standardized in NIST FIPS 180-4, first published in 2001.
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.
Developers should be aware of the negative performance implications of calling these functions multiple times and should consider using EVP_MD_fetch(3) with EVP_MD-SHA2(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.
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