Add crypto_pwhash_str_alg()

src/libsodium/crypto_pwhash/crypto_pwhash.c

@@ -2,6 +2,7 @@
 #include <errno.h>
 #include <string.h>
 
+#include "core.h"
 #include "crypto_pwhash.h"
 
 int
@@ -150,6 +151,23 @@ crypto_pwhash_str(char out[crypto_pwhash_STRBYTES],
                                      opslimit, memlimit);
 }
 
+int
+crypto_pwhash_str_alg(char out[crypto_pwhash_STRBYTES],
+                      const char * const passwd, unsigned long long passwdlen,
+                      unsigned long long opslimit, size_t memlimit, int alg)
+{
+    switch (alg) {
+    case crypto_pwhash_ALG_ARGON2I13:
+        return crypto_pwhash_argon2i_str(out, passwd, passwdlen,
+                                         opslimit, memlimit);
+    case crypto_pwhash_ALG_ARGON2ID13:
+        return crypto_pwhash_argon2id_str(out, passwd, passwdlen,
+                                          opslimit, memlimit);
+    default:
+        sodium_misuse();
+    }
+}
+
 int
 crypto_pwhash_str_verify(const char str[crypto_pwhash_STRBYTES],
                          const char * const passwd,

src/libsodium/include/sodium/crypto_pwhash.h

@@ -107,6 +107,12 @@ int crypto_pwhash_str(char out[crypto_pwhash_STRBYTES],
                       unsigned long long opslimit, size_t memlimit)
             __attribute__ ((warn_unused_result));
 
+SODIUM_EXPORT
+int crypto_pwhash_str_alg(char out[crypto_pwhash_STRBYTES],
+                          const char * const passwd, unsigned long long passwdlen,
+                          unsigned long long opslimit, size_t memlimit, int alg)
+            __attribute__ ((warn_unused_result));
+
 SODIUM_EXPORT
 int crypto_pwhash_str_verify(const char str[crypto_pwhash_STRBYTES],
                              const char * const passwd,

test/default/pwhash.c

@@ -349,6 +349,14 @@ main(void)
             "password", strlen("password")) != -1 || errno != EINVAL) {
         printf("pwhash_str_verify(invalid(11)) failure\n");
     }
+
+    assert(crypto_pwhash_str_alg(str_out, "test", 4, OPSLIMIT, MEMLIMIT,
+                                 crypto_pwhash_ALG_ARGON2I13) == 0);
+    assert(crypto_pwhash_argon2i_str_verify(str_out, "test", 4) == 0);
+    assert(crypto_pwhash_str_alg(str_out, "test", 4, OPSLIMIT, MEMLIMIT,
+                                 crypto_pwhash_ALG_ARGON2ID13) == 0);
+    assert(crypto_pwhash_argon2id_str_verify(str_out, "test", 4) == 0);
+
     assert(crypto_pwhash_bytes_min() > 0U);
     assert(crypto_pwhash_bytes_max() > crypto_pwhash_bytes_min());
     assert(crypto_pwhash_passwd_max() > crypto_pwhash_passwd_min());