Add support for Keccak, SHA3, SHAKE, and RawSHAKE via libkeccak>=1.3 (this version introduced zerocopy)

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

1 files changed, 42 insertions, 0 deletions

diff --git a/libhashsum_init_sha3_hasher.c b/libhashsum_init_sha3_hasher.c
new file mode 100644
index 0000000..c9d6ac7
--- /dev/null
+++ b/libhashsum_init_sha3_hasher.c
@@ -0,0 +1,42 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+#ifdef SUPPORT_SHA3
+
+
+int
+libhashsum_init_sha3_hasher(struct libhashsum_hasher *this, size_t hashbits)
+{
+	struct libkeccak_spec spec;
+
+	if (hashbits == 224U) {
+		this->algorithm = LIBHASHSUM_SHA3_224;
+		this->algorithm_string = "SHA3-224";
+	} else if (hashbits == 256U) {
+		this->algorithm = LIBHASHSUM_SHA3_256;
+		this->algorithm_string = "SHA3-256";
+	} else if (hashbits == 384U) {
+		this->algorithm = LIBHASHSUM_SHA3_384;
+		this->algorithm_string = "SHA3-384";
+	} else if (hashbits == 512U) {
+		this->algorithm = LIBHASHSUM_SHA3_512;
+		this->algorithm_string = "SHA3-512";
+	} else {
+		errno = EINVAL;
+		return -1;
+	}
+
+	libkeccak_spec_sha3(&spec, (long int)hashbits);
+	return libhashsum_init_keccak__(this, hashbits, &spec, LIBKECCAK_SHA3_SUFFIX);
+}
+
+
+#else
+int
+libhashsum_init_sha3_hasher(struct libhashsum_hasher *this, size_t hashbits)
+{
+	(void) this;
+	(void) hashbits;
+	errno = ENOSYS;
+	return -1;
+}
+#endif