From 36a9e0a0dcb33c0cab6fdfcc6847e04b1b786a73 Mon Sep 17 00:00:00 2001
From: Ingela Anderton Andin <ingela@erlang.org>
Date: Wed, 15 May 2013 15:51:44 +0200
Subject: ssl, public_key, crypto: crypto:algorithms/0 -> crypto:supports/0

---
 lib/crypto/doc/src/crypto.xml    | 31 +++++++++++++++++++++----------
 lib/crypto/src/crypto.erl        | 24 +++++++++++++++++++++---
 lib/crypto/test/crypto_SUITE.erl |  6 +++++-
 3 files changed, 47 insertions(+), 14 deletions(-)

(limited to 'lib/crypto')

diff --git a/lib/crypto/doc/src/crypto.xml b/lib/crypto/doc/src/crypto.xml
index cac8f6ef28..b4e471111a 100644
--- a/lib/crypto/doc/src/crypto.xml
+++ b/lib/crypto/doc/src/crypto.xml
@@ -142,21 +142,16 @@
 
      <p><code>des3_key() = [binary(), binary(), binary()] </code> Each key part is 64 bits (in CBC mode only 8 bits are used)</p>
 
-     <p><code> message_digest_algorithms() =  md5 | ripemd160 | sha | sha224 | sha256 | sha384 | sha512 </code> md4 is aslo supported for hash_init/1 and hash/2.
+     <p><code>digest_type() =  md5 | sha | sha224 | sha256 | sha384 | sha512</code></p>
+     <p><code> hash_algorithms() =  md5 | ripemd160 | sha | sha224 | sha256 | sha384 | sha512 </code> md4 is aslo supported for hash_init/1 and hash/2.
      Note that both md4 and md5 are recommended only for compatibility with existing applications.
      </p>
+     <p><code> cipher_algorithms() =  des | des3 | aes | blowfish | rc2 | rc4 </code> </p>
+     <p><code> public_key_algorithms() =   rsa |dss | ecdsa | dh | ecdh </code> </p>
+     
  </section>
 
   <funcs>
-    <func>
-      <name>algorithms() -> [message_digest_algorithms() | md4 | ec]</name>
-      <fsummary>Provide a list of available crypto algorithms.</fsummary>
-      <desc>
-        <p> Can be used to determine if the crypto library has support for elliptic curve (ec) and
-	which message digest algorithms that are supported.</p>
-      </desc>
-    </func>
-
       <func>
       <name>block_encrypt(Type, Key, Ivec, PlainText) -> CipherText</name>
       <fsummary>Encrypt <c>PlainText</c>according to <c>Type</c> block cipher</fsummary>
@@ -665,6 +660,22 @@
       </desc>
     </func>
 
+   <func>
+      <name>supports() -> AlgorithmList </name>
+      <fsummary>Provide a list of available crypto algorithms.</fsummary>
+      <type>
+      <v> AlgorithmList =  [{hashs, [hash_algorithms()]},
+                            {ciphers, [cipher_algorithms()]},
+			    {public_keys, [public_key_algorithms()]}
+      </v>
+      </type>
+      <desc>
+        <p> Can be used to determine which crypto algorithms that are supported
+	by the underlying OpenSSL library</p>
+      </desc>
+    </func>
+
+    
   <func>
       <name>verify(Algorithm, DigestType, Msg, Signature, Key) -> boolean()</name>
       <fsummary>Verifies a digital signature.</fsummary>
diff --git a/lib/crypto/src/crypto.erl b/lib/crypto/src/crypto.erl
index dde53b1217..8c61084f3e 100644
--- a/lib/crypto/src/crypto.erl
+++ b/lib/crypto/src/crypto.erl
@@ -21,7 +21,7 @@
 
 -module(crypto).
 
--export([start/0, stop/0, info_lib/0, algorithms/0, version/0, binary_to_integer/1]).
+-export([start/0, stop/0, info_lib/0, supports/0, version/0, binary_to_integer/1]).
 -export([hash/2, hash_init/1, hash_update/2, hash_final/1]).
 -export([sign/4, verify/5]).
 -export([generate_key/2, generate_key/3, compute_key/4]).
@@ -218,7 +218,7 @@
 		    des_cbc_ivec, des_cfb_ivec,
 		    info,
 		    %%
-		    info_lib, algorithms]).
+		    info_lib, supports]).
 
 -type mpint() :: binary().
 -type rsa_digest_type() :: 'md5' | 'sha' | 'sha224' | 'sha256' | 'sha384' | 'sha512'.
@@ -306,6 +306,22 @@ info_lib() -> ?nif_stub.
 
 algorithms() -> ?nif_stub.
 
+supports()->
+    Algs = algorithms(),
+    PubKeyAlgs = 
+	case lists:member(ec, Algs) of
+	    true ->
+		{public_keys, [rsa, dss, ecdsa, dh, ecdh]};
+	    false ->
+		{public_keys, [rsa, dss, dh]}
+	end,
+    [{hashs, Algs -- [ec]},
+     {ciphers, [des_cbc, des_cfb,  des3_cbc, des3_cbf, des_ede3, blowfish_cbc,
+		blowfish_cfb64, aes_cbc128, aes_cfb128, aes_cbc256, rc2_cbc, aes_ctr, rc4
+	       ]},
+     PubKeyAlgs
+    ].
+
 %% Crypto app version history:
 %% (no version): Driver implementation
 %% 2.0         : NIF implementation, requires OTP R14
@@ -756,10 +772,12 @@ block_decrypt(des_ecb, Key, Data) ->
 block_decrypt(blowfish_ecb, Key, Data) ->
     blowfish_ecb_decrypt(Key, Data).
 
--spec next_iv(des_cbc | aes_cbc, Data::iodata()) -> binary().
+-spec next_iv(des_cbc | des3_cbc | aes_cbc, Data::iodata()) -> binary().
 
 next_iv(des_cbc, Data) ->
     des_cbc_ivec(Data);
+next_iv(des3_cbc, Data) ->
+    des_cbc_ivec(Data);
 next_iv(aes_cbc, Data) ->
     aes_cbc_ivec(Data).
 
diff --git a/lib/crypto/test/crypto_SUITE.erl b/lib/crypto/test/crypto_SUITE.erl
index eddb6b83f9..57f5696d3c 100644
--- a/lib/crypto/test/crypto_SUITE.erl
+++ b/lib/crypto/test/crypto_SUITE.erl
@@ -2334,7 +2334,11 @@ openssl_version() ->
     end.
 
 if_supported(Algorithm, Fun) ->
-    case proplists:get_bool(Algorithm, crypto:algorithms()) of
+    [{hashs, Hashs},
+     {ciphers, Ciphers},
+     {public_keys, Pubkeys}]
+	= crypto:supports(),
+    case proplists:get_bool(Algorithm, Hashs ++ Ciphers ++ Pubkeys) of
 	true ->
 	    Fun();
 	_ ->
-- 
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