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April, 26th. 2006:
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sha
Section: OpenSSL (3)
Updated: 2006-10-27
Index
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NAME
SHA1, SHA1_Init, SHA1_Update, SHA1_Final - Secure Hash Algorithm
SYNOPSIS
#include <openssl/sha.h>
unsigned char *SHA1(const unsigned char *d, unsigned long n,
unsigned char *md);
int SHA1_Init(SHA_CTX *c);
int SHA1_Update(SHA_CTX *c, const void *data,
unsigned long len);
int SHA1_Final(unsigned char *md, SHA_CTX *c);
DESCRIPTION
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.
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.
Applications should use the higher level functions
EVP_DigestInit(3)
etc. instead of calling the hash functions directly.
The predecessor of SHA-1, SHA, is also implemented, but it should be
used only when backward compatibility is required.
RETURN VALUES
SHA1() returns a pointer to the hash value.
SHA1_Init(), SHA1_Update() and SHA1_Final() return 1 for success, 0 otherwise.
CONFORMING TO
SHA: US Federal Information Processing Standard FIPS PUB 180 (Secure Hash
Standard),
SHA-1: US Federal Information Processing Standard FIPS PUB 180-1 (Secure Hash
Standard),
ANSI X9.30
SEE ALSO
ripemd(3), hmac(3), EVP_DigestInit(3)
HISTORY
SHA1(), SHA1_Init(), SHA1_Update() and SHA1_Final() are available in all
versions of SSLeay and OpenSSL.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUES
-
- CONFORMING TO
-
- SEE ALSO
-
- HISTORY
-
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