1 files changed, 69 insertions, 0 deletions
diff --git a/libhashsum_init_sha0_hasher.c b/libhashsum_init_sha0_hasher.c
new file mode 100644
index 0000000..3ed5744
--- /dev/null
+++ b/libhashsum_init_sha0_hasher.c
@@ -0,0 +1,69 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+
+LIBHASHSUM_1_NONNULL_
+static size_t
+process(struct libhashsum_hasher *this, const void *data, size_t bytes)
+{
+	const uint8_t *m = data;
+	int i;
+	bytes -= bytes & 63U;
+	if (bytes > SIZE_MAX >> 3) {
+		for (i = 0; i < 8; i++) {
+			libsha1_update(&this->state.sha0.s, m, bytes);
+			m = &m[bytes >> 3];
+		}
+	} else if (bytes) {
+		libsha1_update(&this->state.sha0.s, m, bytes << 3);
+	}
+	return bytes;
+}
+
+
+LIBHASHSUM_1_NONNULL_
+static int
+finalise_const(struct libhashsum_hasher *this, const void *data, size_t bytes, unsigned extra_bits)
+{
+	const uint8_t *m = data;
+	size_t r;
+
+	if (extra_bits > 7U) {
+		errno = EINVAL;
+		return -1;
+	}
+
+	r = process(this, m, bytes);
+	m = &m[r];
+	bytes -= r;
+
+	libsha1_digest(&this->state.sha0.s, data, (bytes << 3) | extra_bits, this->state.sha0.sum);
+	memset(&this->state.sha0.s, 0, sizeof(this->state.sha0.s));
+	this->hash_output = this->state.sha0.sum;
+	return 0;
+}
+
+
+LIBHASHSUM_1_NONNULL_
+static int
+finalise(struct libhashsum_hasher *this, void *data, size_t bytes, unsigned extra_bits, size_t size)
+{
+	(void) size;
+	return finalise_const(this, data, bytes, extra_bits);
+}
+
+
+int
+libhashsum_init_sha0_hasher(struct libhashsum_hasher *this)
+{
+	this->algorithm = LIBHASHSUM_SHA0;
+	this->input_block_size = 64U;
+	this->hash_size = sizeof(this->state.sha0.sum);
+	this->hash_output = NULL;
+	this->supports_non_whole_bytes = 0;
+	this->process = &process;
+	this->finalise_const = &finalise_const;
+	this->finalise = &finalise;
+	libsha1_init(&this->state.sha0.s, LIBSHA1_0);
+	return 0;
+}