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=head1 NAME

sha - Secure Hash Algorithm

=head1 SYNOPSIS

 #include <openssl/sha.h>

 unsigned char *SHA1(const unsigned char *d, unsigned long n,
                     unsigned char *md);

 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

SHA-1 (Secure Hash Algorithm) is a cryptographic hash function with a
160 bit output.

The predecessor of SHA-1, SHA, is also implemented, but it should be
used only when backward compatibility is required.

=head1 CONFORMING TO

US Federal Information Processing Standard FIPS 180 (Secure Hash
Standard), ANSI X9.30

=head1 SEE ALSO

L<ripemd(3)|ripemd(3)>, L<SHA1(3)|SHA1(3)>, L<SHA1_Init(3)|SHA1_Init(3)>

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