| =pod |
| |
| =head1 NAME |
| |
| SHA1_Init, SHA1_Update_SHA1_Final - Compute SHA1 hash |
| |
| =head1 SYNOPSIS |
| |
| #include <openssl/sha.h> |
| |
| void SHA1_Init(SHA_CTX *c); |
| void SHA1_Update(SHA_CTX *c, const unsigned char *data, |
| unsigned long len); |
| void SHA1_Final(unsigned char *md, SHA_CTX *c); |
| |
| =head1 DESCRIPTION |
| |
| 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>. |
| |
| When the entire message is available at one time, L<SHA1(3)|SHA1(3)> |
| can be used. |
| |
| =head1 RETURN VALUES |
| |
| SHA1_Init(), SHA1_Update() and SHA1_Final() do not return values. |
| |
| =head1 HISTORY |
| |
| SHA1_Init(), SHA1_Update() and SHA1_Final()are available in all |
| versions of SSLeay and OpenSSL. |
| |
| =head1 SEE ALSO |
| |
| L<sha(3)|sha(3)>, L<ripemd(3)|ripemd(3)>, L<SHA1(3)|SHA1(3)> |
| |
| =cut |
