[DOC] prefer "password" to "passphrase"

Let's consistently use the word "password". Although they are considered
synonymous, the mixed usage in the rdoc can cause confusion.

OpenSSL::KDF.scrypt is an exception. This is because RFC 7914 refers to
the input parameter as "passphrase".

Author: rhenium

ext/openssl/ossl.c

@@ -207,7 +207,7 @@ ossl_pem_passwd_cb(char *buf, int max_len, int flag, void *pwd_)
 
     while (1) {
 	/*
-	 * when the flag is nonzero, this passphrase
+	 * when the flag is nonzero, this password
 	 * will be used to perform encryption; otherwise it will
 	 * be used to perform decryption.
 	 */
@@ -676,12 +676,12 @@ ossl_crypto_fixed_length_secure_compare(VALUE dummy, VALUE str1, VALUE str2)
  *
  * Keys saved to disk without encryption are not secure as anyone who gets
  * ahold of the key may use it unless it is encrypted.  In order to securely
- * export a key you may export it with a pass phrase.
+ * export a key you may export it with a password.
  *
  *   cipher = OpenSSL::Cipher.new 'aes-256-cbc'
- *   pass_phrase = 'my secure pass phrase goes here'
+ *   password = 'my secure password goes here'
  *
- *   key_secure = key.export cipher, pass_phrase
+ *   key_secure = key.export cipher, password
  *
  *   open 'private.secure.pem', 'w' do |io|
  *     io.write key_secure
@@ -705,13 +705,13 @@ ossl_crypto_fixed_length_secure_compare(VALUE dummy, VALUE str1, VALUE str2)
  *
  * === Loading an Encrypted Key
  *
- * OpenSSL will prompt you for your pass phrase when loading an encrypted key.
- * If you will not be able to type in the pass phrase you may provide it when
+ * OpenSSL will prompt you for your password when loading an encrypted key.
+ * If you will not be able to type in the password you may provide it when
  * loading the key:
  *
  *   key4_pem = File.read 'private.secure.pem'
- *   pass_phrase = 'my secure pass phrase goes here'
- *   key4 = OpenSSL::PKey.read key4_pem, pass_phrase
+ *   password = 'my secure password goes here'
+ *   key4 = OpenSSL::PKey.read key4_pem, password
  *
  * == RSA Encryption
  *
@@ -943,12 +943,12 @@ ossl_crypto_fixed_length_secure_compare(VALUE dummy, VALUE str1, VALUE str2)
  * not readable by other users.
  *
  *   ca_key = OpenSSL::PKey::RSA.new 2048
- *   pass_phrase = 'my secure pass phrase goes here'
+ *   password = 'my secure password goes here'
  *
  *   cipher = OpenSSL::Cipher.new 'aes-256-cbc'
  *
  *   open 'ca_key.pem', 'w', 0400 do |io|
- *     io.write ca_key.export(cipher, pass_phrase)
+ *     io.write ca_key.export(cipher, password)
  *   end
  *
  * === CA Certificate

ext/openssl/ossl_kdf.c

@@ -21,7 +21,7 @@ static VALUE mKDF, eKDF;
  * (https://tools.ietf.org/html/rfc2898#section-5.2).
  *
  * === Parameters
- * pass       :: The passphrase.
+ * pass       :: The password.
  * salt       :: The salt. Salts prevent attacks based on dictionaries of common
  *               passwords and attacks based on rainbow tables. It is a public
  *               value that can be safely stored along with the password (e.g.

ext/openssl/ossl_pkey_rsa.c

@@ -50,8 +50,8 @@ VALUE eRSAError;
 /*
  * call-seq:
  *   RSA.new -> rsa
- *   RSA.new(encoded_key [, passphrase]) -> rsa
- *   RSA.new(encoded_key) { passphrase } -> rsa
+ *   RSA.new(encoded_key [, password ]) -> rsa
+ *   RSA.new(encoded_key) { password } -> rsa
  *   RSA.new(size [, exponent]) -> rsa
  *
  * Generates or loads an \RSA keypair.
@@ -61,17 +61,17 @@ VALUE eRSAError;
  * #set_crt_params.
  *
  * If called with a String, tries to parse as DER or PEM encoding of an \RSA key.
- * Note that, if _passphrase_ is not specified but the key is encrypted with a
- * passphrase, \OpenSSL will prompt for it.
- * See also OpenSSL::PKey.read which can parse keys of any kinds.
+ * Note that if _password_ is not specified, but the key is encrypted with a
+ * password, \OpenSSL will prompt for it.
+ * See also OpenSSL::PKey.read which can parse keys of any kind.
  *
  * If called with a number, generates a new key pair. This form works as an
  * alias of RSA.generate.
  *
  * Examples:
  *   OpenSSL::PKey::RSA.new 2048
  *   OpenSSL::PKey::RSA.new File.read 'rsa.pem'
- *   OpenSSL::PKey::RSA.new File.read('rsa.pem'), 'my pass phrase'
+ *   OpenSSL::PKey::RSA.new File.read('rsa.pem'), 'my password'
  */
 static VALUE
 ossl_rsa_initialize(int argc, VALUE *argv, VALUE self)
@@ -217,11 +217,11 @@ can_export_rsaprivatekey(VALUE self)
 
 /*
  * call-seq:
- *   rsa.export([cipher, pass_phrase]) => PEM-format String
- *   rsa.to_pem([cipher, pass_phrase]) => PEM-format String
- *   rsa.to_s([cipher, pass_phrase]) => PEM-format String
+ *   rsa.export([cipher, password]) => PEM-format String
+ *   rsa.to_pem([cipher, password]) => PEM-format String
+ *   rsa.to_s([cipher, password]) => PEM-format String
  *
- * Outputs this keypair in PEM encoding.  If _cipher_ and _pass_phrase_ are
+ * Outputs this keypair in PEM encoding.  If _cipher_ and _password_ are
  * given they will be used to encrypt the key.  _cipher_ must be an
  * OpenSSL::Cipher instance.
  */