diff --git a/configure.in b/configure.in

index cb43246..0bb6b0d 100644

--- httpd-2.4.43/configure.in.r1861793+

+++ httpd-2.4.43/configure.in

@@ -465,6 +465,28 @@

 AC_SEARCH_LIBS(crypt, crypt)

 CRYPT_LIBS="$LIBS"

 APACHE_SUBST(CRYPT_LIBS)

+

+if test "$ac_cv_search_crypt" != "no"; then

+   # Test crypt() with the SHA-512 test vector from https://akkadia.org/drepper/SHA-crypt.txt

+   AC_CACHE_CHECK([whether crypt() supports SHA-2], [ap_cv_crypt_sha2], [

+    AC_RUN_IFELSE([AC_LANG_PROGRAM([[

+#include <crypt.h>

+#include <stdlib.h>

+#include <string.h>

+

+#define PASSWD_0 "Hello world!"

+#define SALT_0 "\$6\$saltstring"

+#define EXPECT_0 "\$6\$saltstring\$svn8UoSVapNtMuq1ukKS4tPQd8iKwSMHWjl/O817G3uBnIFNjnQJu" \

+               "esI68u4OTLiBFdcbYEdFCoEOfaS35inz1"

+]], [char *result = crypt(PASSWD_0, SALT_0);

+     if (!result) return 1;

+     if (strcmp(result, EXPECT_0)) return 2;

+])], [ap_cv_crypt_sha2=yes], [ap_cv_crypt_sha2=no])])

+   if test "$ap_cv_crypt_sha2" = yes; then

+     AC_DEFINE([HAVE_CRYPT_SHA2], 1, [Define if crypt() supports SHA-2 hashes])

+   fi

+fi

+

 LIBS="$saved_LIBS"

 dnl See Comment #Spoon

--- httpd-2.4.43/docs/man/htpasswd.1.r1861793+

+++ httpd-2.4.43/docs/man/htpasswd.1

@@ -27,16 +27,16 @@

 .SH "SYNOPSIS"

 .PP

-\fB\fBhtpasswd\fR [ -\fBc\fR ] [ -\fBi\fR ] [ -\fBm\fR | -\fBB\fR | -\fBd\fR | -\fBs\fR | -\fBp\fR ] [ -\fBC\fR \fIcost\fR ] [ -\fBD\fR ] [ -\fBv\fR ] \fIpasswdfile\fR \fIusername\fR\fR

+\fB\fBhtpasswd\fR [ -\fBc\fR ] [ -\fBi\fR ] [ -\fBm\fR | -\fBB\fR | -\fB2\fR | -\fB5\fR | -\fBd\fR | -\fBs\fR | -\fBp\fR ] [ -\fBr\fR \fIrounds\fR ] [ -\fBC\fR \fIcost\fR ] [ -\fBD\fR ] [ -\fBv\fR ] \fIpasswdfile\fR \fIusername\fR\fR

 .PP

-\fB\fBhtpasswd\fR -\fBb\fR [ -\fBc\fR ] [ -\fBm\fR | -\fBB\fR | -\fBd\fR | -\fBs\fR | -\fBp\fR ] [ -\fBC\fR \fIcost\fR ] [ -\fBD\fR ] [ -\fBv\fR ] \fIpasswdfile\fR \fIusername\fR \fIpassword\fR\fR

+\fB\fBhtpasswd\fR -\fBb\fR [ -\fBc\fR ] [ -\fBm\fR | -\fBB\fR | -\fB2\fR | -\fB5\fR | -\fBd\fR | -\fBs\fR | -\fBp\fR ] [ -\fBr\fR \fIrounds\fR ] [ -\fBC\fR \fIcost\fR ] [ -\fBD\fR ] [ -\fBv\fR ] \fIpasswdfile\fR \fIusername\fR \fIpassword\fR\fR

 .PP

-\fB\fBhtpasswd\fR -\fBn\fR [ -\fBi\fR ] [ -\fBm\fR | -\fBB\fR | -\fBd\fR | -\fBs\fR | -\fBp\fR ] [ -\fBC\fR \fIcost\fR ] \fIusername\fR\fR

+\fB\fBhtpasswd\fR -\fBn\fR [ -\fBi\fR ] [ -\fBm\fR | -\fBB\fR | -\fB2\fR | -\fB5\fR | -\fBd\fR | -\fBs\fR | -\fBp\fR ] [ -\fBr\fR \fIrounds\fR ] [ -\fBC\fR \fIcost\fR ] \fIusername\fR\fR

 .PP

-\fB\fBhtpasswd\fR -\fBnb\fR [ -\fBm\fR | -\fBB\fR | -\fBd\fR | -\fBs\fR | -\fBp\fR ] [ -\fBC\fR \fIcost\fR ] \fIusername\fR \fIpassword\fR\fR

+\fB\fBhtpasswd\fR -\fBnb\fR [ -\fBm\fR | -\fBB\fR | -\fB2\fR | -\fB5\fR | -\fBd\fR | -\fBs\fR | -\fBp\fR ] [ -\fBr\fR \fIrounds\fR ] [ -\fBC\fR \fIcost\fR ] \fIusername\fR \fIpassword\fR\fR

 .SH "SUMMARY"

@@ -48,7 +48,7 @@

 Resources available from the Apache HTTP server can be restricted to just the users listed in the files created by \fBhtpasswd\fR\&. This program can only manage usernames and passwords stored in a flat-file\&. It can encrypt and display password information for use in other types of data stores, though\&. To use a DBM database see dbmmanage or htdbm\&.

 .PP

-\fBhtpasswd\fR encrypts passwords using either bcrypt, a version of MD5 modified for Apache, SHA1, or the system's \fBcrypt()\fR routine\&. Files managed by \fBhtpasswd\fR may contain a mixture of different encoding types of passwords; some user records may have bcrypt or MD5-encrypted passwords while others in the same file may have passwords encrypted with \fBcrypt()\fR\&.

+\fBhtpasswd\fR encrypts passwords using either bcrypt, a version of MD5 modified for Apache, SHA-1, or the system's \fBcrypt()\fR routine\&. SHA-2-based hashes (SHA-256 and SHA-512) are supported for \fBcrypt()\fR\&. Files managed by \fBhtpasswd\fR may contain a mixture of different encoding types of passwords; some user records may have bcrypt or MD5-encrypted passwords while others in the same file may have passwords encrypted with \fBcrypt()\fR\&.

 .PP

 This manual page only lists the command line arguments\&. For details of the directives necessary to configure user authentication in httpd see the Apache manual, which is part of the Apache distribution or can be found at http://httpd\&.apache\&.org/\&.

@@ -73,17 +73,26 @@

 \fB-m\fR

 Use MD5 encryption for passwords\&. This is the default (since version 2\&.2\&.18)\&.  

 .TP

+\fB-2\fR

+Use SHA-256 \fBcrypt()\fR based hashes for passwords\&. This is supported on most Unix platforms\&.  

+.TP

+\fB-5\fR

+Use SHA-512 \fBcrypt()\fR based hashes for passwords\&. This is supported on most Unix platforms\&.  

+.TP

 \fB-B\fR

 Use bcrypt encryption for passwords\&. This is currently considered to be very secure\&.  

 .TP

 \fB-C\fR

 This flag is only allowed in combination with \fB-B\fR (bcrypt encryption)\&. It sets the computing time used for the bcrypt algorithm (higher is more secure but slower, default: 5, valid: 4 to 17)\&.  

 .TP

+\fB-r\fR

+This flag is only allowed in combination with \fB-2\fR or \fB-5\fR\&. It sets the number of hash rounds used for the SHA-2 algorithms (higher is more secure but slower; the default is 5,000)\&.  

+.TP

 \fB-d\fR

 Use \fBcrypt()\fR encryption for passwords\&. This is not supported by the httpd server on Windows and Netware\&. This algorithm limits the password length to 8 characters\&. This algorithm is \fBinsecure\fR by today's standards\&. It used to be the default algorithm until version 2\&.2\&.17\&.  

 .TP

 \fB-s\fR

-Use SHA encryption for passwords\&. Facilitates migration from/to Netscape servers using the LDAP Directory Interchange Format (ldif)\&. This algorithm is \fBinsecure\fR by today's standards\&.  

+Use SHA-1 (160-bit) encryption for passwords\&. Facilitates migration from/to Netscape servers using the LDAP Directory Interchange Format (ldif)\&. This algorithm is \fBinsecure\fR by today's standards\&.  

 .TP

 \fB-p\fR

 Use plaintext passwords\&. Though \fBhtpasswd\fR will support creation on all platforms, the httpd daemon will only accept plain text passwords on Windows and Netware\&.  

@@ -152,10 +161,13 @@

 When using the \fBcrypt()\fR algorithm, note that only the first 8 characters of the password are used to form the password\&. If the supplied password is longer, the extra characters will be silently discarded\&.

 .PP

-The SHA encryption format does not use salting: for a given password, there is only one encrypted representation\&. The \fBcrypt()\fR and MD5 formats permute the representation by prepending a random salt string, to make dictionary attacks against the passwords more difficult\&.

+The SHA-1 encryption format does not use salting: for a given password, there is only one encrypted representation\&. The \fBcrypt()\fR and MD5 formats permute the representation by prepending a random salt string, to make dictionary attacks against the passwords more difficult\&.

+ 

+.PP

+The SHA-1 and \fBcrypt()\fR formats are insecure by today's standards\&.

 .PP

-The SHA and \fBcrypt()\fR formats are insecure by today's standards\&.

+The SHA-2-based \fBcrypt()\fR formats (SHA-256 and SHA-512) are supported on most modern Unix systems, and follow the specification at https://www\&.akkadia\&.org/drepper/SHA-crypt\&.txt\&.

 .SH "RESTRICTIONS"

--- httpd-2.4.43/support/htpasswd.c.r1861793+

+++ httpd-2.4.43/support/htpasswd.c

@@ -109,17 +109,21 @@

             "for it." NL

         " -i  Read password from stdin without verification (for script usage)." NL

         " -m  Force MD5 encryption of the password (default)." NL

-        " -B  Force bcrypt encryption of the password (very secure)." NL

+        " -2  Force SHA-256 crypt() hash of the password (very secure)." NL

+        " -5  Force SHA-512 crypt() hash of the password (very secure)." NL

+        " -B  Force bcrypt encryption of the password (very secure)." NL

         " -C  Set the computing time used for the bcrypt algorithm" NL

         "     (higher is more secure but slower, default: %d, valid: 4 to 17)." NL

+        " -r  Set the number of rounds used for the SHA-256, SHA-512 algorithms" NL

+        "     (higher is more secure but slower, default: 5000)." NL

         " -d  Force CRYPT encryption of the password (8 chars max, insecure)." NL

-        " -s  Force SHA encryption of the password (insecure)." NL

+        " -s  Force SHA-1 encryption of the password (insecure)." NL

         " -p  Do not encrypt the password (plaintext, insecure)." NL

         " -D  Delete the specified user." NL

         " -v  Verify password for the specified user." NL

         "On other systems than Windows and NetWare the '-p' flag will "

             "probably not work." NL

-        "The SHA algorithm does not use a salt and is less secure than the "

+        "The SHA-1 algorithm does not use a salt and is less secure than the "

             "MD5 algorithm." NL,

         BCRYPT_DEFAULT_COST

     );

@@ -178,7 +182,7 @@

     if (rv != APR_SUCCESS)

         exit(ERR_SYNTAX);

-    while ((rv = apr_getopt(state, "cnmspdBbDiC:v", &opt, &opt_arg)) == APR_SUCCESS) {

+    while ((rv = apr_getopt(state, "cnmspdBbDi25C:r:v", &opt, &opt_arg)) == APR_SUCCESS) {

         switch (opt) {

         case 'c':

             *mask |= APHTP_NEWFILE;

--- httpd-2.4.43/support/passwd_common.c.r1861793+

+++ httpd-2.4.43/support/passwd_common.c

@@ -179,16 +179,21 @@

 int mkhash(struct passwd_ctx *ctx)

 {

     char *pw;

-    char salt[16];

+    char salt[17];

     apr_status_t rv;

     int ret = 0;

 #if CRYPT_ALGO_SUPPORTED

     char *cbuf;

 #endif

+#ifdef HAVE_CRYPT_SHA2

+    const char *setting;

+    char method;

+#endif

-    if (ctx->cost != 0 && ctx->alg != ALG_BCRYPT) {

+    if (ctx->cost != 0 && ctx->alg != ALG_BCRYPT

+        && ctx->alg != ALG_CRYPT_SHA256 && ctx->alg != ALG_CRYPT_SHA512 ) {

         apr_file_printf(errfile,

-                        "Warning: Ignoring -C argument for this algorithm." NL);

+                        "Warning: Ignoring -C/-r argument for this algorithm." NL);

     }

     if (ctx->passwd == NULL) {

@@ -246,6 +251,34 @@

         break;

 #endif /* CRYPT_ALGO_SUPPORTED */

+#ifdef HAVE_CRYPT_SHA2

+    case ALG_CRYPT_SHA256:

+    case ALG_CRYPT_SHA512:

+        ret = generate_salt(salt, 16, &ctx->errstr, ctx->pool);

+        if (ret != 0)

+            break;

+

+        method = ctx->alg == ALG_CRYPT_SHA256 ? '5': '6';

+

+        if (ctx->cost) 

+            setting = apr_psprintf(ctx->pool, "$%c$rounds=%d$%s",

+                                   method, ctx->cost, salt);

+        else

+            setting = apr_psprintf(ctx->pool, "$%c$%s",

+                                   method, salt);

+

+        cbuf = crypt(pw, setting);

+        if (cbuf == NULL) {

+            rv = APR_FROM_OS_ERROR(errno);

+            ctx->errstr = apr_psprintf(ctx->pool, "crypt() failed: %pm", &rv;;

+            ret = ERR_PWMISMATCH;

+            break;

+        }

+

+        apr_cpystrn(ctx->out, cbuf, ctx->out_len - 1);

+        break;

+#endif /* HAVE_CRYPT_SHA2 */

+

 #if BCRYPT_ALGO_SUPPORTED

     case ALG_BCRYPT:

         rv = apr_generate_random_bytes((unsigned char*)salt, 16);

@@ -294,6 +327,19 @@

     case 's':

         ctx->alg = ALG_APSHA;

         break;

+#ifdef HAVE_CRYPT_SHA2

+    case '2':

+        ctx->alg = ALG_CRYPT_SHA256;

+        break;

+    case '5':

+        ctx->alg = ALG_CRYPT_SHA512;

+        break;

+#else

+    case '2':

+    case '5':

+        ctx->errstr = "SHA-2 crypt() algorithms are not supported on this platform.";

+        return ERR_ALG_NOT_SUPP;

+#endif

     case 'p':

         ctx->alg = ALG_PLAIN;

 #if !PLAIN_ALGO_SUPPORTED

@@ -324,11 +370,12 @@

         return ERR_ALG_NOT_SUPP;

 #endif

         break;

-    case 'C': {

+    case 'C':

+    case 'r': {

             char *endptr;

             long num = strtol(opt_arg, &endptr, 10);

             if (*endptr != '\0' || num <= 0) {

-                ctx->errstr = "argument to -C must be a positive integer";

+                ctx->errstr = "argument to -C/-r must be a positive integer";

                 return ERR_SYNTAX;

             }

             ctx->cost = num;

--- httpd-2.4.43/support/passwd_common.h.r1861793+

+++ httpd-2.4.43/support/passwd_common.h

@@ -28,6 +28,8 @@

 #include "apu_version.h"

 #endif

+#include "ap_config_auto.h"

+

 #define MAX_STRING_LEN 256

 #define ALG_PLAIN 0

@@ -35,6 +37,8 @@

 #define ALG_APMD5 2

 #define ALG_APSHA 3

 #define ALG_BCRYPT 4

+#define ALG_CRYPT_SHA256 5

+#define ALG_CRYPT_SHA512 6

 #define BCRYPT_DEFAULT_COST 5

@@ -84,7 +88,7 @@

     apr_size_t      out_len;

     char            *passwd;

     int             alg;

-    int             cost;

+    int             cost; /* cost for bcrypt, rounds for SHA-2 */

     enum {

         PW_PROMPT = 0,

         PW_ARG,