What is the difference between crypt in












0















crypt has two definitions, from the docs,





  1. One of them uses unistd.h



    #define _XOPEN_SOURCE       /* See feature_test_macros(7) */
    #include <unistd.h>


    This is defined as



    #ifdef __USE_MISC
    /* One-way hash PHRASE, returning a string suitable for storage in the
    user database. SALT selects the one-way function to use, and
    ensures that no two users' hashes are the same, even if they use
    the same passphrase. The return value points to static storage
    which will be overwritten by the next call to crypt. */
    extern char *crypt (const char *__key, const char *__salt)
    __THROW __nonnull ((1, 2));
    #endif



  2. One of them uses GNU crypt.h



    #define _GNU_SOURCE         /* See feature_test_macros(7) */
    #include <crypt.h>


    This is defined as



    /* One-way hash PHRASE, returning a string suitable for storage in the
    user database. SALT selects the one-way function to use, and
    ensures that no two users' hashes are the same, even if they use
    the same passphrase. The return value points to static storage
    which will be overwritten by the next call to crypt. */

    extern char *crypt (const char *__phrase, const char *__salt)
    __THROW __nonnull ((1, 2));





ℹ This question is different from my question here where I'm merely asking about compilation with the unistd.h version









share



























    0















    crypt has two definitions, from the docs,





    1. One of them uses unistd.h



      #define _XOPEN_SOURCE       /* See feature_test_macros(7) */
      #include <unistd.h>


      This is defined as



      #ifdef __USE_MISC
      /* One-way hash PHRASE, returning a string suitable for storage in the
      user database. SALT selects the one-way function to use, and
      ensures that no two users' hashes are the same, even if they use
      the same passphrase. The return value points to static storage
      which will be overwritten by the next call to crypt. */
      extern char *crypt (const char *__key, const char *__salt)
      __THROW __nonnull ((1, 2));
      #endif



    2. One of them uses GNU crypt.h



      #define _GNU_SOURCE         /* See feature_test_macros(7) */
      #include <crypt.h>


      This is defined as



      /* One-way hash PHRASE, returning a string suitable for storage in the
      user database. SALT selects the one-way function to use, and
      ensures that no two users' hashes are the same, even if they use
      the same passphrase. The return value points to static storage
      which will be overwritten by the next call to crypt. */

      extern char *crypt (const char *__phrase, const char *__salt)
      __THROW __nonnull ((1, 2));





    ℹ This question is different from my question here where I'm merely asking about compilation with the unistd.h version









    share

























      0












      0








      0








      crypt has two definitions, from the docs,





      1. One of them uses unistd.h



        #define _XOPEN_SOURCE       /* See feature_test_macros(7) */
        #include <unistd.h>


        This is defined as



        #ifdef __USE_MISC
        /* One-way hash PHRASE, returning a string suitable for storage in the
        user database. SALT selects the one-way function to use, and
        ensures that no two users' hashes are the same, even if they use
        the same passphrase. The return value points to static storage
        which will be overwritten by the next call to crypt. */
        extern char *crypt (const char *__key, const char *__salt)
        __THROW __nonnull ((1, 2));
        #endif



      2. One of them uses GNU crypt.h



        #define _GNU_SOURCE         /* See feature_test_macros(7) */
        #include <crypt.h>


        This is defined as



        /* One-way hash PHRASE, returning a string suitable for storage in the
        user database. SALT selects the one-way function to use, and
        ensures that no two users' hashes are the same, even if they use
        the same passphrase. The return value points to static storage
        which will be overwritten by the next call to crypt. */

        extern char *crypt (const char *__phrase, const char *__salt)
        __THROW __nonnull ((1, 2));





      ℹ This question is different from my question here where I'm merely asking about compilation with the unistd.h version









      share














      crypt has two definitions, from the docs,





      1. One of them uses unistd.h



        #define _XOPEN_SOURCE       /* See feature_test_macros(7) */
        #include <unistd.h>


        This is defined as



        #ifdef __USE_MISC
        /* One-way hash PHRASE, returning a string suitable for storage in the
        user database. SALT selects the one-way function to use, and
        ensures that no two users' hashes are the same, even if they use
        the same passphrase. The return value points to static storage
        which will be overwritten by the next call to crypt. */
        extern char *crypt (const char *__key, const char *__salt)
        __THROW __nonnull ((1, 2));
        #endif



      2. One of them uses GNU crypt.h



        #define _GNU_SOURCE         /* See feature_test_macros(7) */
        #include <crypt.h>


        This is defined as



        /* One-way hash PHRASE, returning a string suitable for storage in the
        user database. SALT selects the one-way function to use, and
        ensures that no two users' hashes are the same, even if they use
        the same passphrase. The return value points to static storage
        which will be overwritten by the next call to crypt. */

        extern char *crypt (const char *__phrase, const char *__salt)
        __THROW __nonnull ((1, 2));





      ℹ This question is different from my question here where I'm merely asking about compilation with the unistd.h version







      linux compiling gnu crypt





      share












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      asked 3 mins ago









      Evan CarrollEvan Carroll

      5,504114381




      5,504114381






















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