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EVP_sha224.3ossl - Man Page



 #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.

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.


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.

Return Values

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.

Conforming to

NIST FIPS 180-4.

See Also

evp(7), EVP_DigestInit(3)

Referenced By


The man pages EVP_sha256.3ossl(3), EVP_sha384.3ossl(3), EVP_sha512_224.3ossl(3), EVP_sha512_256.3ossl(3) and EVP_sha512.3ossl(3) are aliases of EVP_sha224.3ossl(3).

2024-07-09 3.2.2 OpenSSL