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SHA256_INIT(3)			    OpenSSL			SHA256_INIT(3)

NAME
       SHA1, SHA1_Init,	SHA1_Update, SHA1_Final, SHA224, SHA224_Init,
       SHA224_Update, SHA224_Final, SHA256, SHA256_Init, SHA256_Update,
       SHA256_Final, SHA384, SHA384_Init, SHA384_Update, SHA384_Final, SHA512,
       SHA512_Init, SHA512_Update, SHA512_Final	- Secure Hash Algorithm

SYNOPSIS
	#include <openssl/sha.h>

	int SHA1_Init(SHA_CTX *c);
	int SHA1_Update(SHA_CTX	*c, const void *data, size_t len);
	int SHA1_Final(unsigned	char *md, SHA_CTX *c);
	unsigned char *SHA1(const unsigned char	*d, size_t n,
			    unsigned char *md);

	int SHA224_Init(SHA256_CTX *c);
	int SHA224_Update(SHA256_CTX *c, const void *data, size_t len);
	int SHA224_Final(unsigned char *md, SHA256_CTX *c);
	unsigned char *SHA224(const unsigned char *d, size_t n,
			      unsigned char *md);

	int SHA256_Init(SHA256_CTX *c);
	int SHA256_Update(SHA256_CTX *c, const void *data, size_t len);
	int SHA256_Final(unsigned char *md, SHA256_CTX *c);
	unsigned char *SHA256(const unsigned char *d, size_t n,
			      unsigned char *md);

	int SHA384_Init(SHA512_CTX *c);
	int SHA384_Update(SHA512_CTX *c, const void *data, size_t len);
	int SHA384_Final(unsigned char *md, SHA512_CTX *c);
	unsigned char *SHA384(const unsigned char *d, size_t n,
			      unsigned char *md);

	int SHA512_Init(SHA512_CTX *c);
	int SHA512_Update(SHA512_CTX *c, const void *data, size_t len);
	int SHA512_Final(unsigned char *md, SHA512_CTX *c);
	unsigned char *SHA512(const unsigned char *d, size_t n,
			      unsigned char *md);

DESCRIPTION
       Applications should use the higher level	functions EVP_DigestInit(3)
       etc. instead of calling the hash	functions directly.

       SHA-1 (Secure Hash Algorithm) is	a cryptographic	hash function with a
       160 bit output.

       SHA1() computes the SHA-1 message digest	of the n bytes at d and	places
       it in md	(which must have space for SHA_DIGEST_LENGTH ==	20 bytes of
       output).	If md is NULL, the digest is placed in a static	array. Note:
       setting md to NULL is not thread	safe.

       The following functions may be used if the message is not completely
       stored in memory:

       SHA1_Init() initializes a SHA_CTX structure.

       SHA1_Update() can be called repeatedly with chunks of the message to be
       hashed (len bytes at data).

       SHA1_Final() places the message digest in md, which must	have space for
       SHA_DIGEST_LENGTH == 20 bytes of	output,	and erases the SHA_CTX.

       The SHA224, SHA256, SHA384 and SHA512 families of functions operate in
       the same	way as for the SHA1 functions. Note that SHA224	and SHA256 use
       a SHA256_CTX object instead of SHA_CTX. SHA384 and SHA512 use
       SHA512_CTX.  The	buffer md must have space for the output from the SHA
       variant being used (defined by SHA224_DIGEST_LENGTH,
       SHA256_DIGEST_LENGTH, SHA384_DIGEST_LENGTH and SHA512_DIGEST_LENGTH).
       Also note that, as for the SHA1() function above, the SHA224(),
       SHA256(), SHA384() and SHA512() functions are not thread	safe if	md is
       NULL.

RETURN VALUES
       SHA1(), SHA224(), SHA256(), SHA384() and	SHA512() return	a pointer to
       the hash	value.

       SHA1_Init(), SHA1_Update() and SHA1_Final() and equivalent SHA224,
       SHA256, SHA384 and SHA512 functions return 1 for	success, 0 otherwise.

CONFORMING TO
       US Federal Information Processing Standard FIPS PUB 180-4 (Secure Hash
       Standard), ANSI X9.30

SEE ALSO
       EVP_DigestInit(3)

COPYRIGHT
       Copyright 2000-2020 The OpenSSL Project Authors.	All Rights Reserved.

       Licensed	under the OpenSSL license (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>.

1.1.1h				  2020-09-22			SHA256_INIT(3)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUES | CONFORMING TO | SEE ALSO | COPYRIGHT

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