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Fix accessing garbage on error path.
Signed-off-by: NIIBE Yutaka <gniibe@fsij.org> Reported-by: Anthony Romano <anthony.romano@coreos.com>
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@ -1,3 +1,8 @@
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2017-07-19 NIIBE Yutaka <gniibe@fsij.org>
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* polarssl/library/bignum.c (mpi_exp_mod): Call mpi_grow for X
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after the initialization of RR.
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2017-07-18 NIIBE Yutaka <gniibe@fsij.org>
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* src/configure: Bark when not git.
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@ -1632,7 +1632,6 @@ int mpi_exp_mod( mpi *X, const mpi *A, const mpi *E, const mpi *N, mpi *_RR )
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* Init temps and window size
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*/
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mpi_montg_init( &mm, N );
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MPI_CHK( mpi_grow( X, N->n ) );
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/*
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* If 1st call, pre-compute R^2 mod N
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@ -1658,6 +1657,8 @@ int mpi_exp_mod( mpi *X, const mpi *A, const mpi *E, const mpi *N, mpi *_RR )
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memset (d, 0, N->n * ciL); /* Set lower half of D zero. */
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}
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MPI_CHK( mpi_grow( X, N->n ) );
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/*
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* W[1] = A * R^2 * R^-1 mod N = A * R mod N
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*/
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