1 files changed, 118 insertions, 0 deletions
diff --git a/libs/libsodium/src/crypto_auth/hmacsha256/auth_hmacsha256.c b/libs/libsodium/src/crypto_auth/hmacsha256/auth_hmacsha256.c
new file mode 100644
index 0000000000..a951e932b8
--- /dev/null
+++ b/libs/libsodium/src/crypto_auth/hmacsha256/auth_hmacsha256.c
@@ -0,0 +1,118 @@
+
+#include <stddef.h>
+#include <stdint.h>
+#include <string.h>
+
+#include "crypto_auth_hmacsha256.h"
+#include "crypto_hash_sha256.h"
+#include "crypto_verify_32.h"
+#include "randombytes.h"
+#include "utils.h"
+
+size_t
+crypto_auth_hmacsha256_bytes(void)
+{
+    return crypto_auth_hmacsha256_BYTES;
+}
+
+size_t
+crypto_auth_hmacsha256_keybytes(void)
+{
+    return crypto_auth_hmacsha256_KEYBYTES;
+}
+
+size_t
+crypto_auth_hmacsha256_statebytes(void)
+{
+    return sizeof(crypto_auth_hmacsha256_state);
+}
+
+void
+crypto_auth_hmacsha256_keygen(unsigned char k[crypto_auth_hmacsha256_KEYBYTES])
+{
+    randombytes_buf(k, crypto_auth_hmacsha256_KEYBYTES);
+}
+
+int
+crypto_auth_hmacsha256_init(crypto_auth_hmacsha256_state *state,
+                            const unsigned char *key, size_t keylen)
+{
+    unsigned char pad[64];
+    unsigned char khash[32];
+    size_t        i;
+
+    if (keylen > 64) {
+        crypto_hash_sha256_init(&state->ictx);
+        crypto_hash_sha256_update(&state->ictx, key, keylen);
+        crypto_hash_sha256_final(&state->ictx, khash);
+        key    = khash;
+        keylen = 32;
+    }
+    crypto_hash_sha256_init(&state->ictx);
+    memset(pad, 0x36, 64);
+    for (i = 0; i < keylen; i++) {
+        pad[i] ^= key[i];
+    }
+    crypto_hash_sha256_update(&state->ictx, pad, 64);
+
+    crypto_hash_sha256_init(&state->octx);
+    memset(pad, 0x5c, 64);
+    for (i = 0; i < keylen; i++) {
+        pad[i] ^= key[i];
+    }
+    crypto_hash_sha256_update(&state->octx, pad, 64);
+
+    sodium_memzero((void *) pad, sizeof pad);
+    sodium_memzero((void *) khash, sizeof khash);
+
+    return 0;
+}
+
+int
+crypto_auth_hmacsha256_update(crypto_auth_hmacsha256_state *state,
+                              const unsigned char *in, unsigned long long inlen)
+{
+    crypto_hash_sha256_update(&state->ictx, in, inlen);
+
+    return 0;
+}
+
+int
+crypto_auth_hmacsha256_final(crypto_auth_hmacsha256_state *state,
+                             unsigned char                *out)
+{
+    unsigned char ihash[32];
+
+    crypto_hash_sha256_final(&state->ictx, ihash);
+    crypto_hash_sha256_update(&state->octx, ihash, 32);
+    crypto_hash_sha256_final(&state->octx, out);
+
+    sodium_memzero((void *) ihash, sizeof ihash);
+
+    return 0;
+}
+
+int
+crypto_auth_hmacsha256(unsigned char *out, const unsigned char *in,
+                       unsigned long long inlen, const unsigned char *k)
+{
+    crypto_auth_hmacsha256_state state;
+
+    crypto_auth_hmacsha256_init(&state, k, crypto_auth_hmacsha256_KEYBYTES);
+    crypto_auth_hmacsha256_update(&state, in, inlen);
+    crypto_auth_hmacsha256_final(&state, out);
+
+    return 0;
+}
+
+int
+crypto_auth_hmacsha256_verify(const unsigned char *h, const unsigned char *in,
+                              unsigned long long inlen, const unsigned char *k)
+{
+    unsigned char correct[32];
+
+    crypto_auth_hmacsha256(correct, in, inlen, k);
+
+    return crypto_verify_32(h, correct) | (-(h == correct)) |
+           sodium_memcmp(correct, h, 32);
+}