doc/crypto/SHA1_Init.pod

   1 =pod
   2
   3 =head1 NAME
   4
   5 SHA1_Init, SHA1_Update_SHA1_Final - Compute SHA1 hash
   6
   7 =head1 SYNOPSIS
   8
   9  #include <openssl/sha.h>
  10
  11  void SHA1_Init(SHA_CTX *c);
  12  void SHA1_Update(SHA_CTX *c, const unsigned char *data,
  13                   unsigned long len);
  14  void SHA1_Final(unsigned char *md, SHA_CTX *c);
  15
  16 =head1 DESCRIPTION
  17
  18 SHA1_Init() initializes a B<SHA_CTX> structure.
  19
  20 SHA1_Update() can be called repeatedly with chunks of the message to
  21 be hashed (B<len> bytes at B<data>).
  22
  23 SHA1_Final() places the message digest in B<md>, which must have space
  24 for SHA_DIGEST_LENGTH == 20 bytes of output, and erases the B<SHA_CTX>.
  25
  26 When the entire message is available at one time, L<SHA1(3)|SHA(3)>
  27 can be used.
  28
  29 =head1 RETURN VALUES
  30
  31 SHA1_Init(), SHA1_Update() and SHA1_Final() do not return values.
  32
  33 =head1 HISTORY
  34
  35 SHA1_Init(), SHA1_Update() and SHA1_Final()are available in all
  36 versions of SSLeay and OpenSSL.
  37
  38 =head1 SEE ALSO
  39
  40 L<sha(3)|sha(3)>, L<ripemd(3)|ripemd(3)>, L<SHA1(3)|SHA1(3)>
  41
  42 =cut