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Add a better explanation to ecc_25519_gf_sanitize_secret()

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Matthias Schiffer 2015-01-26 05:53:39 +01:00
parent 68821f6b8f
commit 2320e02317
1 changed files with 4 additions and 0 deletions
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src/ec25519_gf.c
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@ -271,6 +271,10 @@ void ecc_25519_gf_recip(ecc_int256_t *out, const ecc_int256_t *in) {
/** /**
* Ensures some properties of a Galois field element to make it fit for use as a secret key * Ensures some properties of a Galois field element to make it fit for use as a secret key
* *
* This sets the 255th bit and clears the 256th and the bottom three bits (so the key
* will be a multiple of 8). See Daniel J. Bernsteins paper "Curve25519: new Diffie-Hellman speed records."
* for the rationale of this.
*
* The same pointers may be used for input and output. * The same pointers may be used for input and output.
*/ */
void ecc_25519_gf_sanitize_secret(ecc_int256_t *out, const ecc_int256_t *in) { void ecc_25519_gf_sanitize_secret(ecc_int256_t *out, const ecc_int256_t *in) {