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NAME

     SHA1, SHA1_Init, SHA1_Update, SHA1_Final - Secure Hash
     Algorithm



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



SEE ALSO
     ripemd(3), hmac(3), EVP_DigestInit(3)



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









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Created 1996-2024 by Maxim Chirkov

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