second-round version of SQIsign

Co-authored-by: Marius A. Aardal <marius.andre.aardal@gmail.com>
Co-authored-by: Gora Adj <gora.adj@tii.ae>
Co-authored-by: Diego F. Aranha <dfaranha@cs.au.dk>
Co-authored-by: Andrea Basso <sqisign@andreabasso.com>
Co-authored-by: Isaac Andrés Canales Martínez <icanalesm0500@gmail.com>
Co-authored-by: Jorge Chávez-Saab <jorgechavezsaab@gmail.com>
Co-authored-by: Maria Corte-Real Santos <mariascrsantos98@gmail.com>
Co-authored-by: Luca De Feo <github@defeo.lu>
Co-authored-by: Max Duparc <max.duparc@epfl.ch>
Co-authored-by: Jonathan Komada Eriksen <jonathan.eriksen97@gmail.com>
Co-authored-by: Décio Luiz Gazzoni Filho <decio@decpp.net>
Co-authored-by: Basil Hess <bhe@zurich.ibm.com>
Co-authored-by: Antonin Leroux <antonin.leroux@polytechnique.org>
Co-authored-by: Patrick Longa <plonga@microsoft.com>
Co-authored-by: Luciano Maino <mainoluciano.96@gmail.com>
Co-authored-by: Michael Meyer <michael@random-oracles.org>
Co-authored-by: Hiroshi Onuki <onuki@mist.i.u-tokyo.ac.jp>
Co-authored-by: Lorenz Panny <lorenz@yx7.cc>
Co-authored-by: Giacomo Pope <giacomopope@gmail.com>
Co-authored-by: Krijn Reijnders <reijnderskrijn@gmail.com>
Co-authored-by: Damien Robert <damien.robert@inria.fr>
Co-authored-by: Francisco Rodríguez-Henriquez <francisco.rodriguez@tii.ae>
Co-authored-by: Sina Schaeffler <sschaeffle@student.ethz.ch>
Co-authored-by: Benjamin Wesolowski <benjamin.wesolowski@ens-lyon.fr>

include/mem.h

@@ -3,10 +3,11 @@
 #ifndef MEM_H
 #define MEM_H
 #include <stddef.h>
+#include <sqisign_namespace.h>
 
 /**
  * Clears and frees allocated memory.
- * 
+ *
  * @param[out] mem Memory to be cleared and freed.
  * @param size Size of memory to be cleared and freed.
  */
@@ -14,10 +15,10 @@ void sqisign_secure_free(void *mem, size_t size);
 
 /**
  * Clears memory.
- * 
+ *
  * @param[out] mem Memory to be cleared.
  * @param size Size of memory to be cleared.
  */
 void sqisign_secure_clear(void *mem, size_t size);
 
-#endif
+#endif

include/rng.h

@@ -3,6 +3,8 @@
 #ifndef rng_h
 #define rng_h
 
+#include <sqisign_namespace.h>
+
 /**
  * Randombytes initialization.
  * Initialization may be needed for some random number generators (e.g. CTR-DRBG).
@@ -11,10 +13,22 @@
  * @param[in] personalization_string Personalization string
  * @param[in] security_strength Security string
  */
+SQISIGN_API
 void randombytes_init(unsigned char *entropy_input,
                       unsigned char *personalization_string,
                       int security_strength);
 
+/**
+ * Random byte generation using /dev/urandom.
+ * The caller is responsible to allocate sufficient memory to hold x.
+ *
+ * @param[out] x Memory to hold the random bytes.
+ * @param[in] xlen Number of random bytes to be generated
+ * @return int 0 on success, -1 otherwise
+ */
+SQISIGN_API
+int randombytes_select(unsigned char *x, unsigned long long xlen);
+
 /**
  * Random byte generation.
  * The caller is responsible to allocate sufficient memory to hold x.
@@ -23,6 +37,7 @@ void randombytes_init(unsigned char *entropy_input,
  * @param[in] xlen Number of random bytes to be generated
  * @return int 0 on success, -1 otherwise
  */
+SQISIGN_API
 int randombytes(unsigned char *x, unsigned long long xlen);
 
 #endif /* rng_h */

include/sig.h

@@ -4,7 +4,9 @@
 #define SQISIGN_H
 
 #include <stdint.h>
+#include <sqisign_namespace.h>
 
+#if defined(ENABLE_SIGN)
 /**
  * SQIsign keypair generation.
  *
@@ -15,6 +17,7 @@
  * @param[out] sk SQIsign secret key
  * @return int status code
  */
+SQISIGN_API 
 int sqisign_keypair(unsigned char *pk, unsigned char *sk);
 
 /**
@@ -31,16 +34,20 @@ int sqisign_keypair(unsigned char *pk, unsigned char *sk);
  * @param[in] sk Compacted secret key
  * @return int status code
  */
+SQISIGN_API 
 int sqisign_sign(unsigned char *sm,
-              unsigned long long *smlen, const unsigned char *m,
-              unsigned long long mlen, const unsigned char *sk);
+                 unsigned long long *smlen,
+                 const unsigned char *m,
+                 unsigned long long mlen,
+                 const unsigned char *sk);
+#endif
 
 /**
  * SQIsign open signature.
  *
- * The implementation performs SQIsign.verify(). If the signature verification succeeded, the original message is stored in m.
- * Keys provided is a compact public key.
- * The caller is responsible to allocate sufficient memory to hold m.
+ * The implementation performs SQIsign.verify(). If the signature verification succeeded, the
+ * original message is stored in m. Keys provided is a compact public key. The caller is responsible
+ * to allocate sufficient memory to hold m.
  *
  * @param[out] m Message stored if verification succeeds
  * @param[out] mlen Pointer to the length of m
@@ -49,10 +56,12 @@ int sqisign_sign(unsigned char *sm,
  * @param[in] pk Compacted public key
  * @return int status code
  */
+SQISIGN_API
 int sqisign_open(unsigned char *m,
-              unsigned long long *mlen, const unsigned char *sm,
-              unsigned long long smlen, const unsigned char *pk);
-
+                 unsigned long long *mlen,
+                 const unsigned char *sm,
+                 unsigned long long smlen,
+                 const unsigned char *pk);
 
 /**
  * SQIsign verify signature.
@@ -66,8 +75,11 @@ int sqisign_open(unsigned char *m,
  * @param[in] pk Compacted public key
  * @return int 0 if verification succeeded, 1 otherwise.
  */
+SQISIGN_API 
 int sqisign_verify(const unsigned char *m,
-                unsigned long long mlen, const unsigned char *sig,
-                unsigned long long siglen, const unsigned char *pk);
+                   unsigned long long mlen,
+                   const unsigned char *sig,
+                   unsigned long long siglen,
+                   const unsigned char *pk);
 
 #endif