1 files changed, 144 insertions, 0 deletions
diff --git a/libs/libsodium/src/crypto_sign/ed25519/ref10/sign.c b/libs/libsodium/src/crypto_sign/ed25519/ref10/sign.c
new file mode 100644
index 0000000000..4df90bddd9
--- /dev/null
+++ b/libs/libsodium/src/crypto_sign/ed25519/ref10/sign.c
@@ -0,0 +1,144 @@
+
+#include <string.h>
+
+#include "crypto_hash_sha512.h"
+#include "crypto_sign_ed25519.h"
+#include "sign_ed25519_ref10.h"
+#include "private/ed25519_ref10.h"
+#include "randombytes.h"
+#include "utils.h"
+
+void
+_crypto_sign_ed25519_ref10_hinit(crypto_hash_sha512_state *hs, int prehashed)
+{
+    static const unsigned char DOM2PREFIX[32 + 2] = {
+        'S', 'i', 'g', 'E', 'd', '2', '5', '5', '1', '9', ' ',
+        'n', 'o', ' ',
+        'E', 'd', '2', '5', '5', '1', '9', ' ',
+        'c', 'o', 'l', 'l', 'i', 's', 'i', 'o', 'n', 's', 1, 0
+    };
+
+    crypto_hash_sha512_init(hs);
+    if (prehashed) {
+        crypto_hash_sha512_update(hs, DOM2PREFIX, sizeof DOM2PREFIX);
+    }
+}
+
+static inline void
+_crypto_sign_ed25519_clamp(unsigned char k[32])
+{
+    k[0] &= 248;
+    k[31] &= 127;
+    k[31] |= 64;
+}
+
+#ifdef ED25519_NONDETERMINISTIC
+/* r = hash(B || empty_labelset || Z || pad1 || k || pad2 || empty_labelset || K || extra || M) (mod q) */
+static void
+_crypto_sign_ed25519_synthetic_r_hv(crypto_hash_sha512_state *hs,
+                                    unsigned char Z[32],
+                                    const unsigned char sk[64])
+{
+    static const unsigned char B[32] = {
+        0x58, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66,
+        0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66,
+        0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66,
+        0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66,
+    };
+    static const unsigned char zeros[128] = { 0x00 };
+    static const unsigned char empty_labelset[3] = { 0x02, 0x00, 0x00 };
+
+    crypto_hash_sha512_update(hs, B, 32);
+    crypto_hash_sha512_update(hs, empty_labelset, 3);
+    randombytes_buf(Z, 32);
+    crypto_hash_sha512_update(hs, Z, 32);
+    crypto_hash_sha512_update(hs, zeros, 128 - (32 + 3 + 32) % 128);
+    crypto_hash_sha512_update(hs, sk, 32);
+    crypto_hash_sha512_update(hs, zeros, 128 - 32 % 128);
+    crypto_hash_sha512_update(hs, empty_labelset, 3);
+    crypto_hash_sha512_update(hs, sk + 32, 32);
+    /* empty extra */
+}
+#endif
+
+int
+_crypto_sign_ed25519_detached(unsigned char *sig, unsigned long long *siglen_p,
+                              const unsigned char *m, unsigned long long mlen,
+                              const unsigned char *sk, int prehashed)
+{
+    crypto_hash_sha512_state hs;
+    unsigned char            az[64];
+    unsigned char            nonce[64];
+    unsigned char            hram[64];
+    ge25519_p3               R;
+
+    _crypto_sign_ed25519_ref10_hinit(&hs, prehashed);
+
+#ifdef ED25519_NONDETERMINISTIC
+    memcpy(az, sk, 32);
+    _crypto_sign_ed25519_synthetic_r_hv(&hs, nonce, az);
+#else
+    crypto_hash_sha512(az, sk, 32);
+    crypto_hash_sha512_update(&hs, az + 32, 32);
+#endif
+
+    crypto_hash_sha512_update(&hs, m, mlen);
+    crypto_hash_sha512_final(&hs, nonce);
+
+    memmove(sig + 32, sk + 32, 32);
+
+    sc25519_reduce(nonce);
+    ge25519_scalarmult_base(&R, nonce);
+    ge25519_p3_tobytes(sig, &R);
+
+    _crypto_sign_ed25519_ref10_hinit(&hs, prehashed);
+    crypto_hash_sha512_update(&hs, sig, 64);
+    crypto_hash_sha512_update(&hs, m, mlen);
+    crypto_hash_sha512_final(&hs, hram);
+
+    sc25519_reduce(hram);
+    _crypto_sign_ed25519_clamp(az);
+    sc25519_muladd(sig + 32, hram, az, nonce);
+
+    sodium_memzero(az, sizeof az);
+    sodium_memzero(nonce, sizeof nonce);
+
+    if (siglen_p != NULL) {
+        *siglen_p = 64U;
+    }
+    return 0;
+}
+
+int
+crypto_sign_ed25519_detached(unsigned char *sig, unsigned long long *siglen_p,
+                             const unsigned char *m, unsigned long long mlen,
+                             const unsigned char *sk)
+{
+    return _crypto_sign_ed25519_detached(sig, siglen_p, m, mlen, sk, 0);
+}
+
+int
+crypto_sign_ed25519(unsigned char *sm, unsigned long long *smlen_p,
+                    const unsigned char *m, unsigned long long mlen,
+                    const unsigned char *sk)
+{
+    unsigned long long siglen;
+
+    memmove(sm + crypto_sign_ed25519_BYTES, m, mlen);
+    /* LCOV_EXCL_START */
+    if (crypto_sign_ed25519_detached(
+            sm, &siglen, sm + crypto_sign_ed25519_BYTES, mlen, sk) != 0 ||
+        siglen != crypto_sign_ed25519_BYTES) {
+        if (smlen_p != NULL) {
+            *smlen_p = 0;
+        }
+        memset(sm, 0, mlen + crypto_sign_ed25519_BYTES);
+        return -1;
+    }
+    /* LCOV_EXCL_STOP */
+
+    if (smlen_p != NULL) {
+        *smlen_p = mlen + siglen;
+    }
+    return 0;
+}