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-rw-r--r--gpxe/src/include/gpxe/cbc.h98
1 files changed, 98 insertions, 0 deletions
diff --git a/gpxe/src/include/gpxe/cbc.h b/gpxe/src/include/gpxe/cbc.h
new file mode 100644
index 00000000..fcc115eb
--- /dev/null
+++ b/gpxe/src/include/gpxe/cbc.h
@@ -0,0 +1,98 @@
+#ifndef _GPXE_CBC_H
+#define _GPXE_CBC_H
+
+/** @file
+ *
+ * Cipher-block chaining
+ *
+ */
+
+#include <gpxe/crypto.h>
+
+/**
+ * Set key
+ *
+ * @v ctx Context
+ * @v key Key
+ * @v keylen Key length
+ * @v raw_cipher Underlying cipher algorithm
+ * @v cbc_ctx CBC context
+ * @ret rc Return status code
+ */
+static inline int cbc_setkey ( void *ctx, const void *key, size_t keylen,
+ struct cipher_algorithm *raw_cipher,
+ void *cbc_ctx __unused ) {
+
+ return cipher_setkey ( raw_cipher, ctx, key, keylen );
+}
+
+/**
+ * Set initialisation vector
+ *
+ * @v ctx Context
+ * @v iv Initialisation vector
+ * @v raw_cipher Underlying cipher algorithm
+ * @v cbc_ctx CBC context
+ */
+static inline void cbc_setiv ( void *ctx __unused, const void *iv,
+ struct cipher_algorithm *raw_cipher,
+ void *cbc_ctx ) {
+ memcpy ( cbc_ctx, iv, raw_cipher->blocksize );
+}
+
+extern void cbc_encrypt ( void *ctx, const void *src, void *dst,
+ size_t len, struct cipher_algorithm *raw_cipher,
+ void *cbc_ctx );
+extern void cbc_decrypt ( void *ctx, const void *src, void *dst,
+ size_t len, struct cipher_algorithm *raw_cipher,
+ void *cbc_ctx );
+
+/**
+ * Create a cipher-block chaining mode of behaviour of an existing cipher
+ *
+ * @v _cbc_name Name for the new CBC cipher
+ * @v _cbc_cipher New cipher algorithm
+ * @v _raw_cipher Underlying cipher algorithm
+ * @v _raw_context Context structure for the underlying cipher
+ * @v _blocksize Cipher block size
+ */
+#define CBC_CIPHER( _cbc_name, _cbc_cipher, _raw_cipher, _raw_context, \
+ _blocksize ) \
+struct _cbc_name ## _context { \
+ _raw_context raw_ctx; \
+ uint8_t cbc_ctx[_blocksize]; \
+}; \
+static int _cbc_name ## _setkey ( void *ctx, const void *key, \
+ size_t keylen ) { \
+ struct _cbc_name ## _context * _cbc_name ## _ctx = ctx; \
+ return cbc_setkey ( &_cbc_name ## _ctx->raw_ctx, key, keylen, \
+ &_raw_cipher, &_cbc_name ## _ctx->cbc_ctx );\
+} \
+static void _cbc_name ## _setiv ( void *ctx, const void *iv ) { \
+ struct _cbc_name ## _context * _cbc_name ## _ctx = ctx; \
+ cbc_setiv ( &_cbc_name ## _ctx->raw_ctx, iv, \
+ &_raw_cipher, &aes_cbc_ctx->cbc_ctx ); \
+} \
+static void _cbc_name ## _encrypt ( void *ctx, const void *src, \
+ void *dst, size_t len ) { \
+ struct _cbc_name ## _context * _cbc_name ## _ctx = ctx; \
+ cbc_encrypt ( &_cbc_name ## _ctx->raw_ctx, src, dst, len, \
+ &_raw_cipher, &aes_cbc_ctx->cbc_ctx ); \
+} \
+static void _cbc_name ## _decrypt ( void *ctx, const void *src, \
+ void *dst, size_t len ) { \
+ struct _cbc_name ## _context * _cbc_name ## _ctx = ctx; \
+ cbc_decrypt ( &_cbc_name ## _ctx->raw_ctx, src, dst, len, \
+ &_raw_cipher, &aes_cbc_ctx->cbc_ctx ); \
+} \
+struct cipher_algorithm _cbc_cipher = { \
+ .name = #_cbc_name, \
+ .ctxsize = sizeof ( struct _cbc_name ## _context ), \
+ .blocksize = _blocksize, \
+ .setkey = _cbc_name ## _setkey, \
+ .setiv = _cbc_name ## _setiv, \
+ .encrypt = _cbc_name ## _encrypt, \
+ .decrypt = _cbc_name ## _decrypt, \
+};
+
+#endif /* _GPXE_CBC_H */