Make algorithms optional

Signed-off-by: Mattias Andrée <maandree@kth.se>

11 files changed, 140 insertions, 16 deletions

diff --git a/libhashsum.h b/libhashsum.h
index 0bfb48a..1e453b3 100644
--- a/libhashsum.h
+++ b/libhashsum.h
@@ -382,7 +382,8 @@ struct libhashsum_hasher {
  * @param   algorithm  The hashing algorithm
  * @return             0 on success, -1 on failure
  * 
- * @throws  EINVAL  `algorithm` is unsupported
+ * @throws  EINVAL  `algorithm` is not recognised
+ * @throws  ENOSYS  Support for `algorithm` was excluded at compile time
  * 
  * @since  1.0
  */
@@ -396,7 +397,7 @@ int libhashsum_init_hasher(struct libhashsum_hasher *this, enum libhashsum_algor
  * @param   this  The output parameter for the functions, details, and state
  * @return        0 on success, -1 on failure
  * 
- * Failure isn't actually possible, so this function always return 0
+ * @throws  ENOSYS  Support was excluded at compile time
  * 
  * @since  1.0
  */
@@ -410,7 +411,7 @@ int libhashsum_init_md2_hasher(struct libhashsum_hasher *this);
  * @param   this  The output parameter for the functions, details, and state
  * @return        0 on success, -1 on failure
  * 
- * Failure isn't actually possible, so this function always return 0
+ * @throws  ENOSYS  Support was excluded at compile time
  * 
  * @since  1.0
  */
@@ -424,7 +425,7 @@ int libhashsum_init_md4_hasher(struct libhashsum_hasher *this);
  * @param   this  The output parameter for the functions, details, and state
  * @return        0 on success, -1 on failure
  * 
- * Failure isn't actually possible, so this function always return 0
+ * @throws  ENOSYS  Support was excluded at compile time
  * 
  * @since  1.0
  */
@@ -438,7 +439,7 @@ int libhashsum_init_md5_hasher(struct libhashsum_hasher *this);
  * @param   this  The output parameter for the functions, details, and state
  * @return        0 on success, -1 on failure
  * 
- * Failure isn't actually possible, so this function always return 0
+ * @throws  ENOSYS  Support was excluded at compile time
  * 
  * @since  1.0
  */
@@ -452,7 +453,7 @@ int libhashsum_init_ripemd_128_hasher(struct libhashsum_hasher *this);
  * @param   this  The output parameter for the functions, details, and state
  * @return        0 on success, -1 on failure
  * 
- * Failure isn't actually possible, so this function always return 0
+ * @throws  ENOSYS  Support was excluded at compile time
  * 
  * @since  1.0
  */
@@ -466,7 +467,7 @@ int libhashsum_init_ripemd_160_hasher(struct libhashsum_hasher *this);
  * @param   this  The output parameter for the functions, details, and state
  * @return        0 on success, -1 on failure
  * 
- * Failure isn't actually possible, so this function always return 0
+ * @throws  ENOSYS  Support was excluded at compile time
  * 
  * @since  1.0
  */
@@ -480,7 +481,7 @@ int libhashsum_init_ripemd_256_hasher(struct libhashsum_hasher *this);
  * @param   this  The output parameter for the functions, details, and state
  * @return        0 on success, -1 on failure
  * 
- * Failure isn't actually possible, so this function always return 0
+ * @throws  ENOSYS  Support was excluded at compile time
  * 
  * @since  1.0
  */
@@ -494,7 +495,7 @@ int libhashsum_init_ripemd_320_hasher(struct libhashsum_hasher *this);
  * @param   this  The output parameter for the functions, details, and state
  * @return        0 on success, -1 on failure
  * 
- * Failure isn't actually possible, so this function always return 0
+ * @throws  ENOSYS  Support was excluded at compile time
  * 
  * @since  1.0
  */
@@ -508,7 +509,7 @@ int libhashsum_init_sha0_hasher(struct libhashsum_hasher *this);
  * @param   this  The output parameter for the functions, details, and state
  * @return        0 on success, -1 on failure
  * 
- * Failure isn't actually possible, so this function always return 0
+ * @throws  ENOSYS  Support was excluded at compile time
  * 
  * @since  1.0
  */
@@ -522,7 +523,7 @@ int libhashsum_init_sha1_hasher(struct libhashsum_hasher *this);
  * @param   this  The output parameter for the functions, details, and state
  * @return        0 on success, -1 on failure
  * 
- * Failure isn't actually possible, so this function always return 0
+ * @throws  ENOSYS  Support was excluded at compile time
  * 
  * @since  1.0
  */
@@ -536,7 +537,7 @@ int libhashsum_init_sha_224_hasher(struct libhashsum_hasher *this);
  * @param   this  The output parameter for the functions, details, and state
  * @return        0 on success, -1 on failure
  * 
- * Failure isn't actually possible, so this function always return 0
+ * @throws  ENOSYS  Support was excluded at compile time
  * 
  * @since  1.0
  */
@@ -550,7 +551,7 @@ int libhashsum_init_sha_256_hasher(struct libhashsum_hasher *this);
  * @param   this  The output parameter for the functions, details, and state
  * @return        0 on success, -1 on failure
  * 
- * Failure isn't actually possible, so this function always return 0
+ * @throws  ENOSYS  Support was excluded at compile time
  * 
  * @since  1.0
  */
@@ -564,7 +565,7 @@ int libhashsum_init_sha_384_hasher(struct libhashsum_hasher *this);
  * @param   this  The output parameter for the functions, details, and state
  * @return        0 on success, -1 on failure
  * 
- * Failure isn't actually possible, so this function always return 0
+ * @throws  ENOSYS  Support was excluded at compile time
  * 
  * @since  1.0
  */
@@ -578,7 +579,7 @@ int libhashsum_init_sha_512_hasher(struct libhashsum_hasher *this);
  * @param   this  The output parameter for the functions, details, and state
  * @return        0 on success, -1 on failure
  * 
- * Failure isn't actually possible, so this function always return 0
+ * @throws  ENOSYS  Support was excluded at compile time
  * 
  * @since  1.0
  */
@@ -592,7 +593,7 @@ int libhashsum_init_sha_512_224_hasher(struct libhashsum_hasher *this);
  * @param   this  The output parameter for the functions, details, and state
  * @return        0 on success, -1 on failure
  * 
- * Failure isn't actually possible, so this function always return 0
+ * @throws  ENOSYS  Support was excluded at compile time
  * 
  * @since  1.0
  */
@@ -612,6 +613,7 @@ int libhashsum_init_sha_512_256_hasher(struct libhashsum_hasher *this);
  * @throws  EINVAL  `hashbits` is invalid (neither 224, 256, 384, nor 512)
  * @throws  EINVAL  The combination of `algobits` and `hashbits` is invalid
  *                  (`hashbits` is 384 or 512 but `algobits` is 32)
+ * @throws  ENOSYS  Support was excluded at compile time
  * 
  * @since  1.0
  */
diff --git a/libhashsum_init_md2_hasher.c b/libhashsum_init_md2_hasher.c
index e3e929e..dd20429 100644
--- a/libhashsum_init_md2_hasher.c
+++ b/libhashsum_init_md2_hasher.c
@@ -1,5 +1,6 @@
 /* See LICENSE file for copyright and license details. */
 #include "common.h"
+#ifdef SUPPORT_MD2
 
 
 static const unsigned char S[] = {
@@ -143,3 +144,14 @@ libhashsum_init_md2_hasher(struct libhashsum_hasher *this)
 	memset(&this->state.md2, 0, sizeof(this->state.md2));
 	return 0;
 }
+
+
+#else
+int
+libhashsum_init_md2_hasher(struct libhashsum_hasher *this)
+{
+	(void) this;
+	errno = ENOSYS;
+	return -1;
+}
+#endif
diff --git a/libhashsum_init_md4_hasher.c b/libhashsum_init_md4_hasher.c
index f3c26ac..fc4d5d9 100644
--- a/libhashsum_init_md4_hasher.c
+++ b/libhashsum_init_md4_hasher.c
@@ -1,5 +1,6 @@
 /* See LICENSE file for copyright and license details. */
 #include "common.h"
+#ifdef SUPPORT_MD4
 
 
 #define LETO32(X)\
@@ -190,3 +191,14 @@ libhashsum_init_md4_hasher(struct libhashsum_hasher *this)
 	this->state.md4.h.h32[3] = UINT32_C(0x10325476);
 	return 0;
 }
+
+
+#else
+int
+libhashsum_init_md4_hasher(struct libhashsum_hasher *this)
+{
+	(void) this;
+	errno = ENOSYS;
+	return -1;
+}
+#endif
diff --git a/libhashsum_init_md5_hasher.c b/libhashsum_init_md5_hasher.c
index 7bf19af..8c06527 100644
--- a/libhashsum_init_md5_hasher.c
+++ b/libhashsum_init_md5_hasher.c
@@ -1,5 +1,6 @@
 /* See LICENSE file for copyright and license details. */
 #include "common.h"
+#ifdef SUPPORT_MD5
 
 
 static const uint32_t S[64] = {
@@ -205,3 +206,14 @@ libhashsum_init_md5_hasher(struct libhashsum_hasher *this)
 	this->state.md5.h.h32[3] = UINT32_C(0x10325476);
 	return 0;
 }
+
+
+#else
+int
+libhashsum_init_md5_hasher(struct libhashsum_hasher *this)
+{
+	(void) this;
+	errno = ENOSYS;
+	return -1;
+}
+#endif
diff --git a/libhashsum_init_ripemd_128_hasher.c b/libhashsum_init_ripemd_128_hasher.c
index ef9f215..699de97 100644
--- a/libhashsum_init_ripemd_128_hasher.c
+++ b/libhashsum_init_ripemd_128_hasher.c
@@ -1,5 +1,6 @@
 /* See LICENSE file for copyright and license details. */
 #include "common.h"
+#ifdef SUPPORT_RIPEMD_128
 
 
 #define LETO32(X)\
@@ -226,3 +227,14 @@ libhashsum_init_ripemd_128_hasher(struct libhashsum_hasher *this)
 	this->state.ripemd_128.h.h32[3] = UINT32_C(0x10325476);
 	return 0;
 }
+
+
+#else
+int
+libhashsum_init_ripemd_128_hasher(struct libhashsum_hasher *this)
+{
+	(void) this;
+	errno = ENOSYS;
+	return -1;
+}
+#endif
diff --git a/libhashsum_init_ripemd_160_hasher.c b/libhashsum_init_ripemd_160_hasher.c
index 001cbb8..b37aec8 100644
--- a/libhashsum_init_ripemd_160_hasher.c
+++ b/libhashsum_init_ripemd_160_hasher.c
@@ -1,5 +1,6 @@
 /* See LICENSE file for copyright and license details. */
 #include "common.h"
+#ifdef SUPPORT_RIPEMD_160
 
 
 #define LETO32(X)\
@@ -230,3 +231,14 @@ libhashsum_init_ripemd_160_hasher(struct libhashsum_hasher *this)
 	this->state.ripemd_160.h.h32[4] = UINT32_C(0xc3d2e1f0);
 	return 0;
 }
+
+
+#else
+int
+libhashsum_init_ripemd_160_hasher(struct libhashsum_hasher *this)
+{
+	(void) this;
+	errno = ENOSYS;
+	return -1;
+}
+#endif
diff --git a/libhashsum_init_ripemd_256_hasher.c b/libhashsum_init_ripemd_256_hasher.c
index f08acf7..beda29f 100644
--- a/libhashsum_init_ripemd_256_hasher.c
+++ b/libhashsum_init_ripemd_256_hasher.c
@@ -1,5 +1,6 @@
 /* See LICENSE file for copyright and license details. */
 #include "common.h"
+#ifdef SUPPORT_RIPEMD_256
 
 
 #define LETO32(X)\
@@ -241,3 +242,14 @@ libhashsum_init_ripemd_256_hasher(struct libhashsum_hasher *this)
 	this->state.ripemd_256.h.h32[7] = UINT32_C(0x01234567);
 	return 0;
 }
+
+
+#else
+int
+libhashsum_init_ripemd_256_hasher(struct libhashsum_hasher *this)
+{
+	(void) this;
+	errno = ENOSYS;
+	return -1;
+}
+#endif
diff --git a/libhashsum_init_ripemd_320_hasher.c b/libhashsum_init_ripemd_320_hasher.c
index 2f09ce7..c9cda07 100644
--- a/libhashsum_init_ripemd_320_hasher.c
+++ b/libhashsum_init_ripemd_320_hasher.c
@@ -1,5 +1,6 @@
 /* See LICENSE file for copyright and license details. */
 #include "common.h"
+#ifdef SUPPORT_RIPEMD_320
 
 
 #define LETO32(X)\
@@ -249,3 +250,14 @@ libhashsum_init_ripemd_320_hasher(struct libhashsum_hasher *this)
 	this->state.ripemd_320.h.h32[9] = UINT32_C(0x3c2d1e0f);
 	return 0;
 }
+
+
+#else
+int
+libhashsum_init_ripemd_320_hasher(struct libhashsum_hasher *this)
+{
+	(void) this;
+	errno = ENOSYS;
+	return -1;
+}
+#endif
diff --git a/libhashsum_init_sha0_hasher.c b/libhashsum_init_sha0_hasher.c
index 8f5854a..6efd8fc 100644
--- a/libhashsum_init_sha0_hasher.c
+++ b/libhashsum_init_sha0_hasher.c
@@ -1,5 +1,6 @@
 /* See LICENSE file for copyright and license details. */
 #include "common.h"
+#ifdef SUPPORT_SHA0
 
 
 LIBHASHSUM_1_NONNULL_
@@ -67,3 +68,14 @@ libhashsum_init_sha0_hasher(struct libhashsum_hasher *this)
 	libsha1_init(&this->state.sha0.s, LIBSHA1_0);
 	return 0;
 }
+
+
+#else
+int
+libhashsum_init_sha0_hasher(struct libhashsum_hasher *this)
+{
+	(void) this;
+	errno = ENOSYS;
+	return -1;
+}
+#endif
diff --git a/libhashsum_init_sha1_hasher.c b/libhashsum_init_sha1_hasher.c
index 8287429..a3aef8e 100644
--- a/libhashsum_init_sha1_hasher.c
+++ b/libhashsum_init_sha1_hasher.c
@@ -1,5 +1,6 @@
 /* See LICENSE file for copyright and license details. */
 #include "common.h"
+#ifdef SUPPORT_SHA1
 
 
 LIBHASHSUM_1_NONNULL_
@@ -67,3 +68,14 @@ libhashsum_init_sha1_hasher(struct libhashsum_hasher *this)
 	libsha1_init(&this->state.sha1.s, LIBSHA1_1);
 	return 0;
 }
+
+
+#else
+int
+libhashsum_init_sha1_hasher(struct libhashsum_hasher *this)
+{
+	(void) this;
+	errno = ENOSYS;
+	return -1;
+}
+#endif
diff --git a/libhashsum_init_sha2_hasher.c b/libhashsum_init_sha2_hasher.c
index ab64517..9246e48 100644
--- a/libhashsum_init_sha2_hasher.c
+++ b/libhashsum_init_sha2_hasher.c
@@ -1,5 +1,6 @@
 /* See LICENSE file for copyright and license details. */
 #include "common.h"
+#ifdef SUPPORT_SHA2
 
 
 LIBHASHSUM_1_NONNULL_
@@ -91,3 +92,16 @@ libhashsum_init_sha2_hasher(struct libhashsum_hasher *this, unsigned algobits, s
 	libsha2_init(&this->state.sha2.s, algo);
 	return 0;
 }
+
+
+#else
+int
+libhashsum_init_sha2_hasher(struct libhashsum_hasher *this, unsigned algobits, size_t hashbits)
+{
+	(void) this;
+	(void) algobits;
+	(void) hashbits;
+	errno = ENOSYS;
+	return -1;
+}
+#endif