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Signed-off-by: Glenn Strauss <gstrauss@gluelogic.com>
This commit is contained in:
Glenn Strauss 2022-12-16 10:47:15 -05:00
parent 2ff77119df
commit 369bfb94c5
1 changed files with 3 additions and 3 deletions
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6
library/ecp.c
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@ -774,7 +774,7 @@ static int mbedtls_ecp_sw_derive_y( const mbedtls_ecp_group *grp,
int parity_bit ) int parity_bit )
{ {
/* y^2 = x^3 + ax + b /* y^2 = x^3 + ax + b
* sqrt(w) = w^((p+1)/4) mod p (for prime p where p = 3 mod 4) * y = sqrt(w) = w^((p+1)/4) mod p (for prime p where p = 3 mod 4)
* *
* Note: this method for extracting square root does not validate that w * Note: this method for extracting square root does not validate that w
* was indeed a square so this function will return garbage in Y if X * was indeed a square so this function will return garbage in Y if X
@ -788,7 +788,7 @@ static int mbedtls_ecp_sw_derive_y( const mbedtls_ecp_group *grp,
int ret; int ret;
mbedtls_mpi exp; mbedtls_mpi exp;
mbedtls_mpi_init(&exp); mbedtls_mpi_init( &exp );
/* use Y to store intermediate results */ /* use Y to store intermediate results */
/* y^2 = x^3 + ax + b = (x^2 + a)x + b */ /* y^2 = x^3 + ax + b = (x^2 + a)x + b */
@ -824,7 +824,7 @@ static int mbedtls_ecp_sw_derive_y( const mbedtls_ecp_group *grp,
cleanup: cleanup:
mbedtls_mpi_free(&exp); mbedtls_mpi_free( &exp );
return( ret ); return( ret );
} }
#endif /* MBEDTLS_ECP_SHORT_WEIERSTRASS_ENABLED */ #endif /* MBEDTLS_ECP_SHORT_WEIERSTRASS_ENABLED */