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Minor documentation improvements

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Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine 2020-07-22 01:26:25 +02:00
parent a3de08d0b5
commit 6d9c8d7b2d
2 changed files with 10 additions and 2 deletions
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2
include/mbedtls/ecp.h
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@ -97,7 +97,7 @@ extern "C" {
/* Note: when adding a new curve: /* Note: when adding a new curve:
* - Add it at the end of this enum, otherwise you'll break the ABI by * - Add it at the end of this enum, otherwise you'll break the ABI by
* changing the numerical value for existing curves. * changing the numerical value for existing curves.
* - Increment MBEDTLS_ECP_DP_MAX below. * - Increment MBEDTLS_ECP_DP_MAX below if needed.
* - Add the corresponding MBEDTLS_ECP_DP_xxx_ENABLED macro definition to * - Add the corresponding MBEDTLS_ECP_DP_xxx_ENABLED macro definition to
* config.h. * config.h.
* - List the curve as a dependency of MBEDTLS_ECP_C and * - List the curve as a dependency of MBEDTLS_ECP_C and

10
library/ecp.c
View File

@ -3295,6 +3295,9 @@ cleanup:
#if defined(MBEDTLS_SELF_TEST) #if defined(MBEDTLS_SELF_TEST)
/* Adjust the exponent to be a valid private point for the specified curve.
* This is sometimes necessary because we use a single set of exponents
* for all curves but the validity of values depends on the curve. */
static int self_test_adjust_exponent( const mbedtls_ecp_group *grp, static int self_test_adjust_exponent( const mbedtls_ecp_group *grp,
mbedtls_mpi *m ) mbedtls_mpi *m )
{ {
@ -3328,11 +3331,13 @@ cleanup:
return( ret ); return( ret );
} }
/* Calculate R = m.P for each m in exponents. Check that the number of
* basic operations doesn't depend on the value of m. */
static int self_test_point( int verbose, static int self_test_point( int verbose,
mbedtls_ecp_group *grp, mbedtls_ecp_group *grp,
mbedtls_ecp_point *R, mbedtls_ecp_point *R,
mbedtls_mpi *m, mbedtls_mpi *m,
mbedtls_ecp_point *P, const mbedtls_ecp_point *P,
const char *const *exponents, const char *const *exponents,
size_t n_exponents ) size_t n_exponents )
{ {
@ -3407,6 +3412,9 @@ int mbedtls_ecp_self_test( int verbose )
#if defined(MBEDTLS_ECP_MONTGOMERY_ENABLED) #if defined(MBEDTLS_ECP_MONTGOMERY_ENABLED)
const char *m_exponents[] = const char *m_exponents[] =
{ {
/* Valid private values for Curve25519. In a build with Curve448
* but not Curve25519, they will be adjusted in
* self_test_adjust_exponent(). */
"4000000000000000000000000000000000000000000000000000000000000000", "4000000000000000000000000000000000000000000000000000000000000000",
"5C3C3C3C3C3C3C3C3C3C3C3C3C3C3C3C3C3C3C3C3C3C3C3C3C3C3C3C3C3C3C30", "5C3C3C3C3C3C3C3C3C3C3C3C3C3C3C3C3C3C3C3C3C3C3C3C3C3C3C3C3C3C3C30",
"5715ECCE24583F7A7023C24164390586842E816D7280A49EF6DF4EAE6B280BF8", "5715ECCE24583F7A7023C24164390586842E816D7280A49EF6DF4EAE6B280BF8",