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=head1 NAME

SHA1 - Compute SHA1 hash

=head1 SYNOPSIS

 #include <openssl/sha.h>

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

=head1 DESCRIPTION

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.

L<SHA1_Init(3)|SHA1_Init(3)> may be used if the message is not completely
stored in memory.

=head1 RETURN VALUE

SHA1() returns a pointer to the hash value. 

=head1 HISTORY

SHA1() is available in all versions of SSLeay and OpenSSL.

=head1 SEE ALSO

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

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