EVP_EncryptInit_ex() and EVP_DecryptInit_ex() had been defined in evp.h but

not implemented. (Bug reported by Martin Szotkowski)

This also changes the non-"_ex" versions to defer directly to
EVP_CipherInit_ex() rather than EVP_CipherInit() to avoid an unecessary
level of indirection.

crypto/evp/evp_enc.c

@@ -197,13 +197,25 @@ int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
 	     const unsigned char *key, const unsigned char *iv)
 	{
-	return EVP_CipherInit(ctx, cipher, key, iv, 1);
+	return EVP_CipherInit_ex(ctx, cipher, NULL, key, iv, 1);
+	}
+
+int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx,const EVP_CIPHER *cipher, ENGINE *impl,
+		const unsigned char *key, const unsigned char *iv)
+	{
+	return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1);
 	}
 
 int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
 	     const unsigned char *key, const unsigned char *iv)
 	{
-	return EVP_CipherInit(ctx, cipher, key, iv, 0);
+	return EVP_CipherInit_ex(ctx, cipher, NULL, key, iv, 0);
+	}
+
+int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, ENGINE *impl,
+	     const unsigned char *key, const unsigned char *iv)
+	{
+	return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0);
 	}
 
 int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,