SHA256_INIT - Online Linux Manual PageSection : 3
Updated : 2021-03-26
Source : 1.1.1k
Note : OpenSSL
NAMESHA1, 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);
DESCRIPTIONApplications 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)
COPYRIGHTCopyright 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>. 0
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