Add accessors and writers for EVP_CIPHER_CTX

New functions:

- EVP_CIPHER_CTX_encrypting()
- EVP_CIPHER_CTX_iv()
- EVP_CIPHER_CTX_iv_noconst()
- EVP_CIPHER_CTX_original_iv()
- EVP_CIPHER_CTX_buf_noconst()
- EVP_CIPHER_CTX_num()
- EVP_CIPHER_CTX_set_num()
- EVP_CIPHER_CTX_cipher_data()
- EVP_CIPHER_CTX_new_cipher_data()

Note that the accessors / writers for iv, buf and num may go away, as
those rather belong in the implementation's own structure (cipher_data)
when the implementation would affect them (that would be the case when
they are flagged EVP_CIPH_CUSTOM_IV or EVP_CIPH_FLAG_CUSTOM_CIPHER).

Reviewed-by: Rich Salz <rsalz@openssl.org>

crypto/evp/evp_lib.c

@@ -232,6 +232,11 @@ const EVP_CIPHER *EVP_CIPHER_CTX_cipher(const EVP_CIPHER_CTX *ctx)
     return ctx->cipher;
 }
 
+int EVP_CIPHER_CTX_encrypting(const EVP_CIPHER_CTX *ctx)
+{
+    return ctx->encrypt;
+}
+
 unsigned long EVP_CIPHER_flags(const EVP_CIPHER *cipher)
 {
     return cipher->flags;
@@ -252,6 +257,18 @@ void EVP_CIPHER_CTX_set_app_data(EVP_CIPHER_CTX *ctx, void *data)
     ctx->app_data = data;
 }
 
+void *EVP_CIPHER_CTX_cipher_data(const EVP_CIPHER_CTX *ctx)
+{
+    return ctx->cipher_data;
+}
+
+/* FIXME: temporary until EVP_CIPHER goes opaque */
+void EVP_CIPHER_CTX_new_cipher_data(EVP_CIPHER_CTX *ctx, size_t size)
+{
+    if (ctx->cipher_data == NULL && ctx->cipher->ctx_size == 0)
+        ctx->cipher_data = OPENSSL_zalloc(size);
+}
+
 int EVP_CIPHER_iv_length(const EVP_CIPHER *cipher)
 {
     return cipher->iv_len;
@@ -262,6 +279,36 @@ int EVP_CIPHER_CTX_iv_length(const EVP_CIPHER_CTX *ctx)
     return ctx->cipher->iv_len;
 }
 
+const unsigned char *EVP_CIPHER_CTX_original_iv(const EVP_CIPHER_CTX *ctx)
+{
+    return ctx->oiv;
+}
+
+const unsigned char *EVP_CIPHER_CTX_iv(const EVP_CIPHER_CTX *ctx)
+{
+    return ctx->iv;
+}
+
+unsigned char *EVP_CIPHER_CTX_iv_noconst(EVP_CIPHER_CTX *ctx)
+{
+    return ctx->iv;
+}
+
+unsigned char *EVP_CIPHER_CTX_buf_noconst(EVP_CIPHER_CTX *ctx)
+{
+    return ctx->buf;
+}
+
+int EVP_CIPHER_CTX_num(const EVP_CIPHER_CTX *ctx)
+{
+    return ctx->num;
+}
+
+void EVP_CIPHER_CTX_set_num(EVP_CIPHER_CTX *ctx, int num)
+{
+    ctx->num = num;
+}
+
 int EVP_CIPHER_key_length(const EVP_CIPHER *cipher)
 {
     return cipher->key_len;

include/openssl/evp.h

@@ -509,13 +509,22 @@ unsigned long EVP_CIPHER_flags(const EVP_CIPHER *cipher);
 # define EVP_CIPHER_mode(e)              (EVP_CIPHER_flags(e) & EVP_CIPH_MODE)
 
 const EVP_CIPHER *EVP_CIPHER_CTX_cipher(const EVP_CIPHER_CTX *ctx);
+int EVP_CIPHER_CTX_encrypting(const EVP_CIPHER_CTX *ctx);
 int EVP_CIPHER_CTX_nid(const EVP_CIPHER_CTX *ctx);
 int EVP_CIPHER_CTX_block_size(const EVP_CIPHER_CTX *ctx);
 int EVP_CIPHER_CTX_key_length(const EVP_CIPHER_CTX *ctx);
 int EVP_CIPHER_CTX_iv_length(const EVP_CIPHER_CTX *ctx);
+const unsigned char *EVP_CIPHER_CTX_iv(const EVP_CIPHER_CTX *ctx);
+const unsigned char *EVP_CIPHER_CTX_original_iv(const EVP_CIPHER_CTX *ctx);
+unsigned char *EVP_CIPHER_CTX_iv_noconst(EVP_CIPHER_CTX *ctx);
+unsigned char *EVP_CIPHER_CTX_buf_noconst(EVP_CIPHER_CTX *ctx);
+int EVP_CIPHER_CTX_num(const EVP_CIPHER_CTX *ctx);
+void EVP_CIPHER_CTX_set_num(EVP_CIPHER_CTX *ctx, int num);
 int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in);
 void *EVP_CIPHER_CTX_get_app_data(const EVP_CIPHER_CTX *ctx);
 void EVP_CIPHER_CTX_set_app_data(EVP_CIPHER_CTX *ctx, void *data);
+void *EVP_CIPHER_CTX_cipher_data(const EVP_CIPHER_CTX *ctx);
+void EVP_CIPHER_CTX_new_cipher_data(EVP_CIPHER_CTX *ctx, size_t size);
 # define EVP_CIPHER_CTX_type(c)         EVP_CIPHER_type(EVP_CIPHER_CTX_cipher(c))
 unsigned long EVP_CIPHER_CTX_flags(const EVP_CIPHER_CTX *ctx);
 # define EVP_CIPHER_CTX_mode(e)          (EVP_CIPHER_CTX_flags(e) & EVP_CIPH_MODE)