Frank Denis
7 years ago
21 changed files with 156 additions and 31 deletions
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#include <string.h> |
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#include "crypto_scalarmult_ed25519.h" |
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#include "private/curve25519_ref10.h" |
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int |
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crypto_scalarmult_ed25519(unsigned char *q, const unsigned char *n, |
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const unsigned char *p) |
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{ |
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unsigned char *t = q; |
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ge_p3 Q; |
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ge_p3 P; |
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if (ge_is_canonical(p) != 0 || ge_has_small_order(p) != 0 || |
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ge_frombytes_negate_vartime(&P, p) != 0 || |
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ge_is_on_main_subgroup(&P) == 0) { |
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return -1; |
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} |
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memmove(t, n, 32); |
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t[0] &= 248; |
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t[31] &= 63; |
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t[31] |= 64; |
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ge_scalarmult(&Q, t, &P); |
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ge_p3_tobytes(q, &Q); |
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q[31] ^= 0x80; |
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return 0; |
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} |
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size_t |
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crypto_scalarmult_ed25519_bytes(void) |
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{ |
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return crypto_scalarmult_ed25519_BYTES; |
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} |
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size_t |
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crypto_scalarmult_ed25519_scalarbytes(void) |
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{ |
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return crypto_scalarmult_ed25519_SCALARBYTES; |
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} |
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#ifndef crypto_scalarmult_ed25519_H |
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#define crypto_scalarmult_ed25519_H |
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#include <stddef.h> |
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#include "export.h" |
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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#define crypto_scalarmult_ed25519_BYTES 32U |
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SODIUM_EXPORT |
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size_t crypto_scalarmult_ed25519_bytes(void); |
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#define crypto_scalarmult_ed25519_SCALARBYTES 32U |
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SODIUM_EXPORT |
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size_t crypto_scalarmult_ed25519_scalarbytes(void); |
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SODIUM_EXPORT |
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int crypto_scalarmult_ed25519(unsigned char *q, const unsigned char *n, |
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const unsigned char *p) |
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__attribute__ ((warn_unused_result)); |
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#ifdef __cplusplus |
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} |
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#endif |
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#endif |
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