1 files changed, 174 insertions, 1 deletions

diff --git a/src/crypto/modes/internal.h b/src/crypto/modes/internal.h
index caeac40..7255a7c 100644
--- a/src/crypto/modes/internal.h
+++ b/src/crypto/modes/internal.h
@@ -149,9 +149,16 @@ __inline uint32_t _bswap4(uint32_t val) {
 #endif
 
 
+/* block128_f is the type of a 128-bit, block cipher. */
+typedef void (*block128_f)(const uint8_t in[16], uint8_t out[16],
+                           const void *key);
+
 /* GCM definitions */
 typedef struct { uint64_t hi,lo; } u128;
 
+/* This differs from upstream's |gcm128_context| in that it does not have the
+ * |key| pointer, in order to make it |memcpy|-friendly. Rather the key is
+ * passed into each call that needs it. */
 struct gcm128_context {
   /* Following 6 names follow names in GCM specification */
   union {
@@ -170,7 +177,6 @@ struct gcm128_context {
 
   unsigned int mres, ares;
   block128_f block;
-  void *key;
 };
 
 struct ccm128_context {
@@ -190,6 +196,173 @@ int crypto_gcm_clmul_enabled(void);
 #endif
 
 
+/* CTR. */
+
+/* ctr128_f is the type of a function that performs CTR-mode encryption. */
+typedef void (*ctr128_f)(const uint8_t *in, uint8_t *out, size_t blocks,
+                         const void *key, const uint8_t ivec[16]);
+
+/* CRYPTO_ctr128_encrypt encrypts (or decrypts, it's the same in CTR mode)
+ * |len| bytes from |in| to |out| using |block| in counter mode. There's no
+ * requirement that |len| be a multiple of any value and any partial blocks are
+ * stored in |ecount_buf| and |*num|, which must be zeroed before the initial
+ * call. The counter is a 128-bit, big-endian value in |ivec| and is
+ * incremented by this function. */
+void CRYPTO_ctr128_encrypt(const uint8_t *in, uint8_t *out, size_t len,
+                           const void *key, uint8_t ivec[16],
+                           uint8_t ecount_buf[16], unsigned int *num,
+                           block128_f block);
+
+/* CRYPTO_ctr128_encrypt_ctr32 acts like |CRYPTO_ctr128_encrypt| but takes
+ * |ctr|, a function that performs CTR mode but only deals with the lower 32
+ * bits of the counter. This is useful when |ctr| can be an optimised
+ * function. */
+void CRYPTO_ctr128_encrypt_ctr32(const uint8_t *in, uint8_t *out, size_t len,
+                                 const void *key, uint8_t ivec[16],
+                                 uint8_t ecount_buf[16], unsigned int *num,
+                                 ctr128_f ctr);
+
+
+/* GCM.
+ *
+ * This API differs from the upstream API slightly. The |GCM128_CONTEXT| does
+ * not have a |key| pointer that points to the key as upstream's version does.
+ * Instead, every function takes a |key| parameter. This way |GCM128_CONTEXT|
+ * can be safely copied. */
+
+typedef struct gcm128_context GCM128_CONTEXT;
+
+/* CRYPTO_gcm128_new allocates a fresh |GCM128_CONTEXT| and calls
+ * |CRYPTO_gcm128_init|. It returns the new context, or NULL on error. */
+OPENSSL_EXPORT GCM128_CONTEXT *CRYPTO_gcm128_new(const void *key,
+                                                 block128_f block);
+
+/* CRYPTO_gcm128_init initialises |ctx| to use |block| (typically AES) with
+ * the given key. */
+OPENSSL_EXPORT void CRYPTO_gcm128_init(GCM128_CONTEXT *ctx, const void *key,
+                                       block128_f block);
+
+/* CRYPTO_gcm128_setiv sets the IV (nonce) for |ctx|. The |key| must be the
+ * same key that was passed to |CRYPTO_gcm128_init|. */
+OPENSSL_EXPORT void CRYPTO_gcm128_setiv(GCM128_CONTEXT *ctx, const void *key,
+                                        const uint8_t *iv, size_t iv_len);
+
+/* CRYPTO_gcm128_aad sets the authenticated data for an instance of GCM.
+ * This must be called before and data is encrypted. It returns one on success
+ * and zero otherwise. */
+OPENSSL_EXPORT int CRYPTO_gcm128_aad(GCM128_CONTEXT *ctx, const uint8_t *aad,
+                                     size_t len);
+
+/* CRYPTO_gcm128_encrypt encrypts |len| bytes from |in| to |out|. The |key|
+ * must be the same key that was passed to |CRYPTO_gcm128_init|. It returns one
+ * on success and zero otherwise. */
+OPENSSL_EXPORT int CRYPTO_gcm128_encrypt(GCM128_CONTEXT *ctx, const void *key,
+                                         const uint8_t *in, uint8_t *out,
+                                         size_t len);
+
+/* CRYPTO_gcm128_decrypt decrypts |len| bytes from |in| to |out|. The |key|
+ * must be the same key that was passed to |CRYPTO_gcm128_init|. It returns one
+ * on success and zero otherwise. */
+OPENSSL_EXPORT int CRYPTO_gcm128_decrypt(GCM128_CONTEXT *ctx, const void *key,
+                                         const uint8_t *in, uint8_t *out,
+                                         size_t len);
+
+/* CRYPTO_gcm128_encrypt_ctr32 encrypts |len| bytes from |in| to |out| using
+ * a CTR function that only handles the bottom 32 bits of the nonce, like
+ * |CRYPTO_ctr128_encrypt_ctr32|. The |key| must be the same key that was
+ * passed to |CRYPTO_gcm128_init|. It returns one on success and zero
+ * otherwise. */
+OPENSSL_EXPORT int CRYPTO_gcm128_encrypt_ctr32(GCM128_CONTEXT *ctx,
+                                               const void *key,
+                                               const uint8_t *in, uint8_t *out,
+                                               size_t len, ctr128_f stream);
+
+/* CRYPTO_gcm128_decrypt_ctr32 decrypts |len| bytes from |in| to |out| using
+ * a CTR function that only handles the bottom 32 bits of the nonce, like
+ * |CRYPTO_ctr128_encrypt_ctr32|. The |key| must be the same key that was
+ * passed to |CRYPTO_gcm128_init|. It returns one on success and zero
+ * otherwise. */
+OPENSSL_EXPORT int CRYPTO_gcm128_decrypt_ctr32(GCM128_CONTEXT *ctx,
+                                               const void *key,
+                                               const uint8_t *in, uint8_t *out,
+                                               size_t len, ctr128_f stream);
+
+/* CRYPTO_gcm128_finish calculates the authenticator and compares it against
+ * |len| bytes of |tag|. It returns one on success and zero otherwise. */
+OPENSSL_EXPORT int CRYPTO_gcm128_finish(GCM128_CONTEXT *ctx, const uint8_t *tag,
+                                        size_t len);
+
+/* CRYPTO_gcm128_tag calculates the authenticator and copies it into |tag|.
+ * The minimum of |len| and 16 bytes are copied into |tag|. */
+OPENSSL_EXPORT void CRYPTO_gcm128_tag(GCM128_CONTEXT *ctx, uint8_t *tag,
+                                      size_t len);
+
+/* CRYPTO_gcm128_release clears and frees |ctx|. */
+OPENSSL_EXPORT void CRYPTO_gcm128_release(GCM128_CONTEXT *ctx);
+
+
+/* CBC. */
+
+/* cbc128_f is the type of a function that performs CBC-mode encryption. */
+typedef void (*cbc128_f)(const uint8_t *in, uint8_t *out, size_t len,
+                         const void *key, uint8_t ivec[16], int enc);
+
+/* CRYPTO_cbc128_encrypt encrypts |len| bytes from |in| to |out| using the
+ * given IV and block cipher in CBC mode. The input need not be a multiple of
+ * 128 bits long, but the output will round up to the nearest 128 bit multiple,
+ * zero padding the input if needed. The IV will be updated on return. */
+void CRYPTO_cbc128_encrypt(const uint8_t *in, uint8_t *out, size_t len,
+                           const void *key, uint8_t ivec[16], block128_f block);
+
+/* CRYPTO_cbc128_decrypt decrypts |len| bytes from |in| to |out| using the
+ * given IV and block cipher in CBC mode. If |len| is not a multiple of 128
+ * bits then only that many bytes will be written, but a multiple of 128 bits
+ * is always read from |in|. The IV will be updated on return. */
+void CRYPTO_cbc128_decrypt(const uint8_t *in, uint8_t *out, size_t len,
+                           const void *key, uint8_t ivec[16], block128_f block);
+
+
+/* OFB. */
+
+/* CRYPTO_ofb128_encrypt encrypts (or decrypts, it's the same with OFB mode)
+ * |len| bytes from |in| to |out| using |block| in OFB mode. There's no
+ * requirement that |len| be a multiple of any value and any partial blocks are
+ * stored in |ivec| and |*num|, the latter must be zero before the initial
+ * call. */
+void CRYPTO_ofb128_encrypt(const uint8_t *in, uint8_t *out,
+                           size_t len, const void *key, uint8_t ivec[16],
+                           int *num, block128_f block);
+
+
+/* CFB. */
+
+/* CRYPTO_cfb128_encrypt encrypts (or decrypts, if |enc| is zero) |len| bytes
+ * from |in| to |out| using |block| in CFB mode. There's no requirement that
+ * |len| be a multiple of any value and any partial blocks are stored in |ivec|
+ * and |*num|, the latter must be zero before the initial call. */
+void CRYPTO_cfb128_encrypt(const uint8_t *in, uint8_t *out, size_t len,
+                           const void *key, uint8_t ivec[16], int *num, int enc,
+                           block128_f block);
+
+/* CRYPTO_cfb128_8_encrypt encrypts (or decrypts, if |enc| is zero) |len| bytes
+ * from |in| to |out| using |block| in CFB-8 mode. Prior to the first call
+ * |num| should be set to zero. */
+void CRYPTO_cfb128_8_encrypt(const uint8_t *in, uint8_t *out, size_t len,
+                             const void *key, uint8_t ivec[16], int *num,
+                             int enc, block128_f block);
+
+/* CRYPTO_cfb128_1_encrypt encrypts (or decrypts, if |enc| is zero) |len| bytes
+ * from |in| to |out| using |block| in CFB-1 mode. Prior to the first call
+ * |num| should be set to zero. */
+void CRYPTO_cfb128_1_encrypt(const uint8_t *in, uint8_t *out, size_t bits,
+                             const void *key, uint8_t ivec[16], int *num,
+                             int enc, block128_f block);
+
+size_t CRYPTO_cts128_encrypt_block(const uint8_t *in, uint8_t *out, size_t len,
+                                   const void *key, uint8_t ivec[16],
+                                   block128_f block);
+
+
 #if defined(__cplusplus)
 } /* extern C */
 #endif