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authorMattias Andrée <maandree@kth.se>2024-08-23 23:40:36 +0200
committerMattias Andrée <maandree@kth.se>2024-08-23 23:40:36 +0200
commit4dc7dcef3136b49ff6cb34f28508965433863be8 (patch)
tree2909c34a9351f3567bccec4741ecd53b98327d31 /libhashsum_init_sha2_hasher.c
parentFixes + add SHA0 and SHA1 using libsha1 (diff)
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Fixes + add SHA2 support via libsha2
Signed-off-by: Mattias Andrée <maandree@kth.se>
Diffstat (limited to '')
-rw-r--r--libhashsum_init_sha2_hasher.c93
1 files changed, 93 insertions, 0 deletions
diff --git a/libhashsum_init_sha2_hasher.c b/libhashsum_init_sha2_hasher.c
new file mode 100644
index 0000000..ab64517
--- /dev/null
+++ b/libhashsum_init_sha2_hasher.c
@@ -0,0 +1,93 @@
+/* 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 & (this->input_block_size - 1U);
+ if (bytes > SIZE_MAX >> 3) {
+ for (i = 0; i < 8; i++) {
+ libsha2_update(&this->state.sha2.s, m, bytes);
+ m = &m[bytes >> 3];
+ }
+ } else if (bytes) {
+ libsha2_update(&this->state.sha2.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;
+
+ libsha2_digest(&this->state.sha2.s, data, (bytes << 3) | extra_bits, this->state.sha2.sum);
+ memset(&this->state.sha2.s, 0, sizeof(this->state.sha2.s));
+ this->hash_output = this->state.sha2.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_sha2_hasher(struct libhashsum_hasher *this, unsigned algobits, size_t hashbits)
+{
+ enum libsha2_algorithm algo;
+
+ if (algobits == 32U && hashbits == 224U) {
+ this->algorithm = LIBHASHSUM_SHA_224;
+ algo = LIBSHA2_224;
+ } else if (algobits == 32U && hashbits == 256U) {
+ this->algorithm = LIBHASHSUM_SHA_256;
+ algo = LIBSHA2_256;
+ } else if (algobits == 64U && hashbits == 384U) {
+ this->algorithm = LIBHASHSUM_SHA_384;
+ algo = LIBSHA2_384;
+ } else if (algobits == 64U && hashbits == 512U) {
+ this->algorithm = LIBHASHSUM_SHA_512;
+ algo = LIBSHA2_512;
+ } else if (algobits == 64U && hashbits == 224U) {
+ this->algorithm = LIBHASHSUM_SHA_512_224;
+ algo = LIBSHA2_512_224;
+ } else if (algobits == 64U && hashbits == 256U) {
+ this->algorithm = LIBHASHSUM_SHA_512_256;
+ algo = LIBSHA2_512_256;
+ } else {
+ errno = EINVAL;
+ return -1;
+ }
+
+ this->input_block_size = (size_t)algobits << 1;
+ this->hash_size = hashbits >> 3;
+ this->hash_output = NULL;
+ this->supports_non_whole_bytes = 1;
+ this->process = &process;
+ this->finalise_const = &finalise_const;
+ this->finalise = &finalise;
+ libsha2_init(&this->state.sha2.s, algo);
+ return 0;
+}