New constant NETTLE_MAX_BIGNUM_SIZE.

ChangeLog

+2012-04-23  Niels Möller  <nisse@lysator.liu.se>
+
+	* nettle-internal.h (NETTLE_MAX_BIGNUM_SIZE): New constant. Based
+	on NETTLE_MAX_BIGNUM_BITS, rounded upwards. Replaced all uses of
+	NETTLE_MAX_BIGNUM_BITS.
+
 2012-04-19  Niels Möller  <nisse@lysator.liu.se>
 
 	* list-obj-sizes.awk: Use decimal rather than hexadecimal output.

bignum-random.c

@@ -38,7 +38,7 @@ nettle_mpz_random_size(mpz_t x,
 		       unsigned bits)
 {
   unsigned length = (bits + 7) / 8;
-  TMP_DECL(data, uint8_t, NETTLE_MAX_BIGNUM_BITS / 8);
+  TMP_DECL(data, uint8_t, NETTLE_MAX_BIGNUM_SIZE);
   TMP_ALLOC(data, length);
 
   random(ctx, length, data);

nettle-internal.h

@@ -45,6 +45,7 @@ do { if (size > (sizeof(name) / sizeof(name[0]))) abort(); } while (0)
 
 /* Arbitrary limits which apply to systems that don't have alloca */
 #define NETTLE_MAX_BIGNUM_BITS 10000
+#define NETTLE_MAX_BIGNUM_SIZE ((NETTLE_MAX_BIGNUM_BITS + 7)/8)
 #define NETTLE_MAX_HASH_BLOCK_SIZE 128
 #define NETTLE_MAX_HASH_DIGEST_SIZE 64
 #define NETTLE_MAX_SEXP_ASSOC 17

pkcs1-decrypt.c

@@ -38,11 +38,11 @@ pkcs1_decrypt (unsigned key_size,
 	       const mpz_t m,
 	       unsigned *length, uint8_t *message)
 {
-  TMP_DECL(em, uint8_t, NETTLE_MAX_BIGNUM_BITS / 8);
+  TMP_DECL(em, uint8_t, NETTLE_MAX_BIGNUM_SIZE);
   uint8_t *terminator;
   unsigned padding;
   unsigned message_length;
-  
+
   TMP_ALLOC(em, key_size);
   nettle_mpz_get_str_256(key_size, em, m);
 

pkcs1-rsa-md5.c

@@ -64,7 +64,7 @@ md5_prefix[] =
 int
 pkcs1_rsa_md5_encode(mpz_t m, unsigned size, struct md5_ctx *hash)
 {
-  TMP_DECL(em, uint8_t, NETTLE_MAX_BIGNUM_BITS / 8);
+  TMP_DECL(em, uint8_t, NETTLE_MAX_BIGNUM_SIZE);
   TMP_ALLOC(em, size);
 
   if (pkcs1_signature_prefix(size, em,
@@ -83,7 +83,7 @@ pkcs1_rsa_md5_encode(mpz_t m, unsigned size, struct md5_ctx *hash)
 int
 pkcs1_rsa_md5_encode_digest(mpz_t m, unsigned size, const uint8_t *digest)
 {
-  TMP_DECL(em, uint8_t, NETTLE_MAX_BIGNUM_BITS / 8);
+  TMP_DECL(em, uint8_t, NETTLE_MAX_BIGNUM_SIZE);
   TMP_ALLOC(em, size);
 
   if (pkcs1_signature_prefix(size, em,

pkcs1-rsa-sha1.c

@@ -64,7 +64,7 @@ sha1_prefix[] =
 int
 pkcs1_rsa_sha1_encode(mpz_t m, unsigned size, struct sha1_ctx *hash)
 {
-  TMP_DECL(em, uint8_t, NETTLE_MAX_BIGNUM_BITS / 8);
+  TMP_DECL(em, uint8_t, NETTLE_MAX_BIGNUM_SIZE);
   TMP_ALLOC(em, size);
 
   if (pkcs1_signature_prefix(size, em,
@@ -83,7 +83,7 @@ pkcs1_rsa_sha1_encode(mpz_t m, unsigned size, struct sha1_ctx *hash)
 int
 pkcs1_rsa_sha1_encode_digest(mpz_t m, unsigned size, const uint8_t *digest)
 {
-  TMP_DECL(em, uint8_t, NETTLE_MAX_BIGNUM_BITS / 8);
+  TMP_DECL(em, uint8_t, NETTLE_MAX_BIGNUM_SIZE);
   TMP_ALLOC(em, size);
 
   if (pkcs1_signature_prefix(size, em,

pkcs1-rsa-sha256.c

@@ -62,7 +62,7 @@ sha256_prefix[] =
 int
 pkcs1_rsa_sha256_encode(mpz_t m, unsigned size, struct sha256_ctx *hash)
 {
-  TMP_DECL(em, uint8_t, NETTLE_MAX_BIGNUM_BITS / 8);
+  TMP_DECL(em, uint8_t, NETTLE_MAX_BIGNUM_SIZE);
   TMP_ALLOC(em, size);
 
   if (pkcs1_signature_prefix(size, em,
@@ -81,7 +81,7 @@ pkcs1_rsa_sha256_encode(mpz_t m, unsigned size, struct sha256_ctx *hash)
 int
 pkcs1_rsa_sha256_encode_digest(mpz_t m, unsigned size, const uint8_t *digest)
 {
-  TMP_DECL(em, uint8_t, NETTLE_MAX_BIGNUM_BITS / 8);
+  TMP_DECL(em, uint8_t, NETTLE_MAX_BIGNUM_SIZE);
   TMP_ALLOC(em, size);
 
   if (pkcs1_signature_prefix(size, em,

pkcs1-rsa-sha512.c

@@ -62,7 +62,7 @@ sha512_prefix[] =
 int
 pkcs1_rsa_sha512_encode(mpz_t m, unsigned size, struct sha512_ctx *hash)
 {
-  TMP_DECL(em, uint8_t, NETTLE_MAX_BIGNUM_BITS / 8);
+  TMP_DECL(em, uint8_t, NETTLE_MAX_BIGNUM_SIZE);
   TMP_ALLOC(em, size);
 
   if (pkcs1_signature_prefix(size, em,
@@ -82,7 +82,7 @@ pkcs1_rsa_sha512_encode(mpz_t m, unsigned size, struct sha512_ctx *hash)
 int
 pkcs1_rsa_sha512_encode_digest(mpz_t m, unsigned size, const uint8_t *digest)
 {
-  TMP_DECL(em, uint8_t, NETTLE_MAX_BIGNUM_BITS / 8);
+  TMP_DECL(em, uint8_t, NETTLE_MAX_BIGNUM_SIZE);
   TMP_ALLOC(em, size);
 
   if (pkcs1_signature_prefix(size, em,

rsa-encrypt.c

@@ -43,7 +43,7 @@ rsa_encrypt(const struct rsa_public_key *key,
 	    unsigned length, const uint8_t *message,
 	    mpz_t gibbberish)
 {
-  TMP_DECL(em, uint8_t, NETTLE_MAX_BIGNUM_BITS / 8);
+  TMP_DECL(em, uint8_t, NETTLE_MAX_BIGNUM_SIZE);
   unsigned padding;
   unsigned i;