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Merge pull request #10 from tarcieri/scalarmult_raw

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crypto_scalarmult_raw()
This commit is contained in:
Frank Denis 2013-02-22 11:09:41 -08:00
commit 9b14a46a0c
3 changed files with 15 additions and 2 deletions
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1
src/libsodium/crypto_scalarmult/curve25519/ref/crypto_scalarmult.h
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@ -4,6 +4,7 @@
#include "crypto_scalarmult_curve25519.h"
#define crypto_scalarmult crypto_scalarmult_curve25519
#define crypto_scalarmult_raw crypto_scalarmult_curve25519_raw
#define crypto_scalarmult_base crypto_scalarmult_curve25519_base
#define crypto_scalarmult_BYTES crypto_scalarmult_curve25519_BYTES
#define crypto_scalarmult_SCALARBYTES crypto_scalarmult_curve25519_SCALARBYTES

14
src/libsodium/crypto_scalarmult/curve25519/ref/smult.c
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@ -248,13 +248,23 @@ int crypto_scalarmult(unsigned char *q,
const unsigned char *n,
const unsigned char *p)
{
unsigned int work[96];
unsigned char e[32];
unsigned int i;
for (i = 0;i < 32;++i) e[i] = n[i];
e[0] &= 248;
e[31] &= 127;
e[31] |= 64;
return crypto_scalarmult_raw(q, e, p);
}
int crypto_scalarmult_raw(unsigned char *q,
const unsigned char *n,
const unsigned char *p)
{
unsigned int work[96];
unsigned char e[32];
unsigned int i;
for (i = 0;i < 32;++i) e[i] = n[i];
for (i = 0;i < 32;++i) work[i] = p[i];
mainloop(work,e);
recip(work + 32,work + 32);
@ -262,4 +272,4 @@ int crypto_scalarmult(unsigned char *q,
freeze(work + 64);
for (i = 0;i < 32;++i) q[i] = work[64 + i];
return 0;
}
}

2
src/libsodium/include/sodium/crypto_scalarmult_curve25519.h
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@ -8,12 +8,14 @@
extern "C" {
#endif
extern int crypto_scalarmult_curve25519_ref(unsigned char *,const unsigned char *,const unsigned char *);
extern int crypto_scalarmult_curve25519_ref_raw(unsigned char *,const unsigned char *, const unsigned char *);
extern int crypto_scalarmult_curve25519_ref_base(unsigned char *,const unsigned char *);
#ifdef __cplusplus
}
#endif
#define crypto_scalarmult_curve25519 crypto_scalarmult_curve25519_ref
#define crypto_scalarmult_curve25519_raw crypto_scalarmult_curve25519_ref_raw
#define crypto_scalarmult_curve25519_base crypto_scalarmult_curve25519_ref_base
#define crypto_scalarmult_curve25519_BYTES crypto_scalarmult_curve25519_ref_BYTES
#define crypto_scalarmult_curve25519_SCALARBYTES crypto_scalarmult_curve25519_ref_SCALARBYTES