You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
70 lines
1.9 KiB
70 lines
1.9 KiB
=pod |
|
|
|
=head1 NAME |
|
|
|
SHA1, SHA1_Init, SHA1_Update, SHA1_Final - Secure Hash Algorithm |
|
|
|
=head1 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); |
|
|
|
=head1 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 B<n> |
|
bytes at B<d> and places it in B<md> (which must have space for |
|
SHA_DIGEST_LENGTH == 20 bytes of output). If B<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 B<SHA_CTX> structure. |
|
|
|
SHA1_Update() can be called repeatedly with chunks of the message to |
|
be hashed (B<len> bytes at B<data>). |
|
|
|
SHA1_Final() places the message digest in B<md>, which must have space |
|
for SHA_DIGEST_LENGTH == 20 bytes of output, and erases the B<SHA_CTX>. |
|
|
|
Applications should use the higher level functions |
|
L<EVP_DigestInit(3)|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. |
|
|
|
=head1 RETURN VALUES |
|
|
|
SHA1() returns a pointer to the hash value. |
|
|
|
SHA1_Init(), SHA1_Update() and SHA1_Final() return 1 for success, 0 otherwise. |
|
|
|
=head1 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 |
|
|
|
=head1 SEE ALSO |
|
|
|
L<ripemd(3)|ripemd(3)>, L<hmac(3)|hmac(3)>, L<EVP_DigestInit(3)|EVP_DigestInit(3)> |
|
|
|
=head1 HISTORY |
|
|
|
SHA1(), SHA1_Init(), SHA1_Update() and SHA1_Final() are available in all |
|
versions of SSLeay and OpenSSL. |
|
|
|
=cut
|
|
|