Provide an EVP implementation for ChaCha.

ok miod@

6 files changed, 108 insertions, 0 deletions

diff --git a/src/lib/libcrypto/chacha/chacha.c b/src/lib/libcrypto/chacha/chacha.c
index d76d64de4a..1bc95f502d 100644
--- a/src/lib/libcrypto/chacha/chacha.c
+++ b/src/lib/libcrypto/chacha/chacha.c
@@ -14,9 +14,29 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
+#include "chacha.h"
 #include "chacha-merged.c"
 
 void
+ChaCha_set_key(ChaCha_ctx *ctx, const unsigned char *key, uint32_t keybits)
+{
+        chacha_keysetup((chacha_ctx *)ctx, key, keybits);
+}
+
+void
+ChaCha_set_iv(ChaCha_ctx *ctx, const unsigned char *iv,
+    const unsigned char *counter)
+{
+        chacha_ivsetup((chacha_ctx *)ctx, iv, counter);
+}
+
+void
+ChaCha(ChaCha_ctx *ctx, unsigned char *out, const unsigned char *in, size_t len)
+{
+        chacha_encrypt_bytes((chacha_ctx *)ctx, in, out, (uint32_t)len);
+}
+
+void
 CRYPTO_chacha_20(unsigned char *out, const unsigned char *in, size_t len,
     const unsigned char key[32], const unsigned char iv[8], size_t counter)
 {
diff --git a/src/lib/libcrypto/chacha/chacha.h b/src/lib/libcrypto/chacha/chacha.h
index d66a719ae4..456d960ed9 100644
--- a/src/lib/libcrypto/chacha/chacha.h
+++ b/src/lib/libcrypto/chacha/chacha.h
@@ -29,6 +29,17 @@
 extern "C" {
 #endif
 
+typedef struct {
+        unsigned int input[16];
+} ChaCha_ctx;
+
+void ChaCha_set_key(ChaCha_ctx *ctx, const unsigned char *key,
+    unsigned int keybits);
+void ChaCha_set_iv(ChaCha_ctx *ctx, const unsigned char *iv,
+    const unsigned char *counter);
+void ChaCha(ChaCha_ctx *ctx, unsigned char *out, const unsigned char *in,
+    size_t len);
+
 void CRYPTO_chacha_20(unsigned char *out, const unsigned char *in, size_t len,
     const unsigned char key[32], const unsigned char iv[8], size_t counter);
 
diff --git a/src/lib/libcrypto/evp/c_allc.c b/src/lib/libcrypto/evp/c_allc.c
index 2a45d435e5..2047b6cd61 100644
--- a/src/lib/libcrypto/evp/c_allc.c
+++ b/src/lib/libcrypto/evp/c_allc.c
@@ -227,4 +227,8 @@ void OpenSSL_add_all_ciphers(void)
         EVP_add_cipher_alias(SN_camellia_256_cbc,"CAMELLIA256");
         EVP_add_cipher_alias(SN_camellia_256_cbc,"camellia256");
 #endif
+
+#ifndef OPENSSL_NO_CHACHA
+        EVP_add_cipher(EVP_chacha20());
+#endif
         }
diff --git a/src/lib/libcrypto/evp/e_chacha.c b/src/lib/libcrypto/evp/e_chacha.c
new file mode 100644
index 0000000000..4a20186006
--- /dev/null
+++ b/src/lib/libcrypto/evp/e_chacha.c
@@ -0,0 +1,65 @@
+/*
+ * Copyright (c) 2014 Joel Sing <jsing@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef OPENSSL_NO_CHACHA
+
+#include <openssl/chacha.h>
+#include <openssl/evp.h>
+#include <openssl/objects.h>
+
+#include "evp_locl.h"
+
+static int chacha_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
+    const unsigned char *in, size_t len);
+static int chacha_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
+    const unsigned char *iv, int enc);
+
+static const EVP_CIPHER chacha20_cipher = {
+        .nid = NID_chacha20,
+        .block_size = 1,
+        .key_len = 32,
+        .iv_len = 8,
+        .flags = EVP_CIPH_STREAM_CIPHER,
+        .init = chacha_init,
+        .do_cipher = chacha_cipher,
+        .ctx_size = sizeof(ChaCha_ctx)
+};
+
+const EVP_CIPHER *
+EVP_chacha20(void)
+{
+        return(&chacha20_cipher);
+}
+
+static int
+chacha_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
+    const unsigned char *iv, int enc)
+{
+        ChaCha_set_key((ChaCha_ctx *)ctx->cipher_data, key,
+            EVP_CIPHER_CTX_key_length(ctx) * 8);
+        ChaCha_set_iv((ChaCha_ctx *)ctx->cipher_data, iv, NULL);
+        return 1;
+}
+
+static int
+chacha_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, const unsigned char *in,
+    size_t len)
+{
+        ChaCha((ChaCha_ctx *)ctx->cipher_data, out, in, len);
+        return 1;
+}
+
+#endif
diff --git a/src/lib/libcrypto/evp/evp.h b/src/lib/libcrypto/evp/evp.h
index f43fe33b47..fa98d4d93c 100644
--- a/src/lib/libcrypto/evp/evp.h
+++ b/src/lib/libcrypto/evp/evp.h
@@ -838,6 +838,10 @@ const EVP_CIPHER *EVP_seed_cfb128(void);
 const EVP_CIPHER *EVP_seed_ofb(void);
 #endif
 
+#ifndef OPENSSL_NO_CHACHA
+const EVP_CIPHER *EVP_chacha20(void);
+#endif
+
 void OPENSSL_add_all_algorithms_noconf(void);
 void OPENSSL_add_all_algorithms_conf(void);
 
diff --git a/src/lib/libcrypto/objects/objects.txt b/src/lib/libcrypto/objects/objects.txt
index 487e079255..bb44aa77a3 100644
--- a/src/lib/libcrypto/objects/objects.txt
+++ b/src/lib/libcrypto/objects/objects.txt
@@ -1309,3 +1309,7 @@ brainpool 1 13 : brainpoolP512r1
 brainpool 1 14 : brainpoolP512t1
 
 1 2 250 1 223 101 256 1 : FRP256v1
+
+# ChaCha Stream Cipher
+!Cname chacha20
+                        : ChaCha                : chacha