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
#include <openssl/sha.h>
unsigned char *SHA1(const unsigned char *data, size_t count, unsigned char *md_buf);
unsigned char *SHA224(const unsigned char *data, size_t count, unsigned char *md_buf);
unsigned char *SHA256(const unsigned char *data, size_t count, unsigned char *md_buf);
unsigned char *SHA384(const unsigned char *data, size_t count, unsigned char *md_buf);
unsigned char *SHA512(const unsigned char *data, size_t count, unsigned char *md_buf);
The following functions have been deprecated since OpenSSL 3.0, and can be
hidden entirely by defining
OPENSSL_API_COMPAT with a suitable version
value, see
openssl_user_macros(7):
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);
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);
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);
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);
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);
All of the functions described on this page except for
SHA1(),
SHA224(),
SHA256(),
SHA384() and
SHA512() are
deprecated. Applications should instead use
EVP_DigestInit_ex(3),
EVP_DigestUpdate(3) and
EVP_DigestFinal_ex(3), or the quick
one-shot function
EVP_Q_digest(3).
SHA1(),
SHA224(),
SHA256(),
SHA384(), and
SHA256() can continue to be used.
They can also be replaced by, e.g.,
(EVP_Q_digest(d, n, md, NULL, NULL, "SHA256", NULL) ? md : NULL)
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.
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.
US Federal Information Processing Standard FIPS PUB 180-4 (Secure Hash
Standard), ANSI X9.30
EVP_Q_digest(3),
EVP_DigestInit(3)
All of these functions except SHA*() were deprecated in OpenSSL 3.0.
Copyright 2000-2021 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
<
https://www.openssl.org/source/license.html>.