5 SHA1, SHA1_Init, SHA1_Update, SHA1_Final, SHA224, SHA224_Init, SHA224_Update,
6 SHA224_Final, SHA256, SHA256_Init, SHA256_Update, SHA256_Final, SHA384,
7 SHA384_Init, SHA384_Update, SHA384_Final, SHA512, SHA512_Init, SHA512_Update,
8 SHA512_Final - Secure Hash Algorithm
12 #include <openssl/sha.h>
14 unsigned char *SHA1(const void *data, size_t count, unsigned char *md_buf);
15 unsigned char *SHA224(const void *data, size_t count, unsigned char *md_buf);
16 unsigned char *SHA256(const void *data, size_t count, unsigned char *md_buf);
17 unsigned char *SHA384(const void *data, size_t count, unsigned char *md_buf);
18 unsigned char *SHA512(const void *data, size_t count, unsigned char *md_buf);
20 Deprecated since OpenSSL 3.0, can be hidden entirely by defining
21 B<OPENSSL_API_COMPAT> with a suitable version value, see
22 L<openssl_user_macros(7)>:
24 int SHA1_Init(SHA_CTX *c);
25 int SHA1_Update(SHA_CTX *c, const void *data, size_t len);
26 int SHA1_Final(unsigned char *md, SHA_CTX *c);
28 int SHA224_Init(SHA256_CTX *c);
29 int SHA224_Update(SHA256_CTX *c, const void *data, size_t len);
30 int SHA224_Final(unsigned char *md, SHA256_CTX *c);
32 int SHA256_Init(SHA256_CTX *c);
33 int SHA256_Update(SHA256_CTX *c, const void *data, size_t len);
34 int SHA256_Final(unsigned char *md, SHA256_CTX *c);
36 int SHA384_Init(SHA512_CTX *c);
37 int SHA384_Update(SHA512_CTX *c, const void *data, size_t len);
38 int SHA384_Final(unsigned char *md, SHA512_CTX *c);
40 int SHA512_Init(SHA512_CTX *c);
41 int SHA512_Update(SHA512_CTX *c, const void *data, size_t len);
42 int SHA512_Final(unsigned char *md, SHA512_CTX *c);
46 All of the functions described on this page
47 except for SHA1(), SHA224(), SHA256(), SHA384() and SHA512() are deprecated.
48 Applications should instead use L<EVP_DigestInit_ex(3)>, L<EVP_DigestUpdate(3)>
49 and L<EVP_DigestFinal_ex(3)>, or the quick one-shot function L<EVP_Q_digest(3)>.
50 SHA1(), SHA224(), SHA256(), SHA384(), and SHA256()
51 can continue to be used. They can also be replaced by, e.g.,
53 (EVP_Q_digest(d, n, md, NULL, NULL, "SHA256", NULL) ? md : NULL)
55 SHA-1 (Secure Hash Algorithm) is a cryptographic hash function with a
58 SHA1() computes the SHA-1 message digest of the B<n>
59 bytes at B<d> and places it in B<md> (which must have space for
60 SHA_DIGEST_LENGTH == 20 bytes of output). If B<md> is NULL, the digest
61 is placed in a static array. Note: setting B<md> to NULL is B<not thread safe>.
63 The following functions may be used if the message is not completely
66 SHA1_Init() initializes a B<SHA_CTX> structure.
68 SHA1_Update() can be called repeatedly with chunks of the message to
69 be hashed (B<len> bytes at B<data>).
71 SHA1_Final() places the message digest in B<md>, which must have space
72 for SHA_DIGEST_LENGTH == 20 bytes of output, and erases the B<SHA_CTX>.
74 The SHA224, SHA256, SHA384 and SHA512 families of functions operate in the
75 same way as for the SHA1 functions. Note that SHA224 and SHA256 use a
76 B<SHA256_CTX> object instead of B<SHA_CTX>. SHA384 and SHA512 use B<SHA512_CTX>.
77 The buffer B<md> must have space for the output from the SHA variant being used
78 (defined by SHA224_DIGEST_LENGTH, SHA256_DIGEST_LENGTH, SHA384_DIGEST_LENGTH and
79 SHA512_DIGEST_LENGTH). Also note that, as for the SHA1() function above, the
80 SHA224(), SHA256(), SHA384() and SHA512() functions are not thread safe if
85 SHA1(), SHA224(), SHA256(), SHA384() and SHA512() return a pointer to the hash
88 SHA1_Init(), SHA1_Update() and SHA1_Final() and equivalent SHA224, SHA256,
89 SHA384 and SHA512 functions return 1 for success, 0 otherwise.
93 US Federal Information Processing Standard FIPS PUB 180-4 (Secure Hash
104 All of these functions except SHA*() were deprecated in OpenSSL 3.0.
108 Copyright 2000-2021 The OpenSSL Project Authors. All Rights Reserved.
110 Licensed under the Apache License 2.0 (the "License"). You may not use
111 this file except in compliance with the License. You can obtain a copy
112 in the file LICENSE in the source distribution or at
113 L<https://www.openssl.org/source/license.html>.