MirOS Manual: SHA1(3), SHA1_Final(3), SHA1_Init(3), SHA1_Update(3)


SHA1(3)                      OpenSSL                      SHA1(3)

NAME

     SHA1, SHA1_Init, SHA1_Update, SHA1_Final - Secure Hash Algo-
     rithm

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 void *data,
                       unsigned long len);
      void SHA1_Final(unsigned char *md, SHA_CTX *c);

DESCRIPTION

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

     SHA1() computes the SHA-1 message digest of the n bytes at d
     and places it in md (which must have space for
     SHA_DIGEST_LENGTH == 20 bytes of output). If 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 SHA_CTX structure.

     SHA1_Update() can be called repeatedly with chunks of the
     message to be hashed (len bytes at data).

     SHA1_Final() places the message digest in md, which must
     have space for SHA_DIGEST_LENGTH == 20 bytes of output, and
     erases the SHA_CTX.

     Applications should use the higher level functions
     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.

RETURN VALUES

     SHA1() returns a pointer to the hash value.

     SHA1_Init(), SHA1_Update() and SHA1_Final() do not return
     values.

CONFORMING TO

     SHA: US Federal Information Processing Standard FIPS PUB 180
     (Secure Hash Standard), SHA-1: US Federal Information

MirOS BSD #10-current      2005-02-05                           1

SHA1(3)                      OpenSSL                      SHA1(3)

     Processing Standard FIPS PUB 180-1 (Secure Hash Standard),
     ANSI X9.30

SEE ALSO

     RIPEMD160(3), HMAC(3), EVP_DigestInit(3)

HISTORY

     SHA1(), SHA1_Init(), SHA1_Update() and SHA1_Final() are
     available in all versions of SSLeay and OpenSSL.

MirOS BSD #10-current      2005-02-05                           2

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