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lib/crypto.h

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+/**
+ * RPiPlay - An open-source AirPlay mirroring server for Raspberry Pi
+ * Copyright (C) 2019 Florian Draschbacher
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
+ */
+
+/* 
+ * Helper methods for various crypto operations.
+ * Uses OpenSSL behind the scenes.
+*/
+
+#ifndef CRYPTO_H
+#define CRYPTO_H
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// 128bit AES in CTR mode
+
+#define AES_128_BLOCK_SIZE 16
+
+typedef enum aes_direction_e { AES_DECRYPT, AES_ENCRYPT } aes_direction_t;
+
+typedef struct aes_ctx_s aes_ctx_t;
+
+aes_ctx_t *aes_ctr_init(const uint8_t *key, const uint8_t *iv);
+void aes_ctr_reset(aes_ctx_t *ctx);
+void aes_ctr_encrypt(aes_ctx_t *ctx, const uint8_t *in, uint8_t *out, int len);
+void aes_ctr_decrypt(aes_ctx_t *ctx, const uint8_t *in, uint8_t *out, int len);
+void aes_ctr_start_fresh_block(aes_ctx_t *ctx);
+void aes_ctr_destroy(aes_ctx_t *ctx);
+
+aes_ctx_t *aes_cbc_init(const uint8_t *key, const uint8_t *iv, aes_direction_t direction);
+void aes_cbc_reset(aes_ctx_t *ctx);
+void aes_cbc_encrypt(aes_ctx_t *ctx, const uint8_t *in, uint8_t *out, int len);
+void aes_cbc_decrypt(aes_ctx_t *ctx, const uint8_t *in, uint8_t *out, int len);
+void aes_cbc_destroy(aes_ctx_t *ctx);
+
+// SHA512
+
+typedef struct sha_ctx_s sha_ctx_t;
+sha_ctx_t *sha_init();
+void sha_update(sha_ctx_t *ctx, const uint8_t *in, int len);
+void sha_final(sha_ctx_t *ctx, uint8_t *out, unsigned int *len);
+void sha_reset(sha_ctx_t *ctx);
+void sha_destroy(sha_ctx_t *ctx);
+
+#ifdef __cplusplus
+}
+#endif
+#endif