1 files changed, 52 insertions, 0 deletions
diff --git a/libhashsum_init_shake_hasher.c b/libhashsum_init_shake_hasher.c
new file mode 100644
index 0000000..a5f5746
--- /dev/null
+++ b/libhashsum_init_shake_hasher.c
@@ -0,0 +1,52 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+#ifdef SUPPORT_SHAKE
+
+
+int
+libhashsum_init_shake_hasher(struct libhashsum_hasher *this, size_t hcapbits, size_t hashbits)
+{
+	struct libkeccak_spec spec;
+
+	if (hcapbits == 128U) {
+		this->algorithm = LIBHASHSUM_SHAKE128;
+		this->algorithm_string = "SHAKE128";
+	} else if (hcapbits == 256U) {
+		this->algorithm = LIBHASHSUM_SHAKE256;
+		this->algorithm_string = "SHAKE256";
+	} else if (hcapbits == 512U) {
+		this->algorithm = LIBHASHSUM_SHAKE512;
+		this->algorithm_string = "SHAKE512";
+	} else {
+		errno = EINVAL;
+		return -1;
+	}
+
+	if (hashbits == 0U) {
+		hashbits = hcapbits;
+	} else if (hashbits > (size_t)LONG_MAX) {
+		errno = EINVAL;
+		return -1;
+	}
+
+	if (hashbits != hcapbits) {
+		sprintf(this->state.keccak.algostr, "%s[n=%zu]", this->algorithm_string, hashbits);
+		this->algorithm_string = this->state.keccak.algostr;
+	}
+
+	libkeccak_spec_shake(&spec, (long int)hcapbits, (long int)hashbits);
+	return libhashsum_init_keccak__(this, hashbits, &spec, LIBKECCAK_SHAKE_SUFFIX);
+}
+
+
+#else
+int
+libhashsum_init_shake_hasher(struct libhashsum_hasher *this, size_t hcapbits, size_t hashbits)
+{
+	(void) this;
+	(void) hcapbits;
+	(void) hashbits;
+	errno = ENOSYS;
+	return -1;
+}
+#endif