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Fix odd bitlength RSA key generation
Fix issue that caused a hang up when generating RSA keys of odd bitlength.
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@ -7,6 +7,7 @@ Bugfix
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arguments where the same (in-place doubling). Found and fixed by Janos
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Follath. #309
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* Fix issue in Makefile that prevented building using armar. #386
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* Fix issue that caused a hang up when generating RSA keys of odd bitlength
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Changes
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* On ARM platforms, when compiling with -O0 with GCC, Clang or armcc5,
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@ -97,7 +97,8 @@ int rsa_gen_key( rsa_context *ctx,
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if( f_rng == NULL || nbits < 128 || exponent < 3 )
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return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
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mpi_init( &P1 ); mpi_init( &Q1 ); mpi_init( &H ); mpi_init( &G );
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mpi_init( &P1 ); mpi_init( &Q1 );
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mpi_init( &H ); mpi_init( &G );
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/*
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* find primes P and Q with Q < P so that:
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@ -107,14 +108,15 @@ int rsa_gen_key( rsa_context *ctx,
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do
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{
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MPI_CHK( mpi_gen_prime( &ctx->P, ( nbits + 1 ) >> 1, 0,
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MPI_CHK( mpi_gen_prime( &ctx->P, nbits >> 1, 0,
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f_rng, p_rng ) );
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MPI_CHK( mpi_gen_prime( &ctx->Q, ( nbits + 1 ) >> 1, 0,
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if( nbits % 2 )
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MPI_CHK( mpi_gen_prime( &ctx->Q, ( nbits >> 1 ) + 1, 0,
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f_rng, p_rng ) );
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else
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MPI_CHK( mpi_gen_prime( &ctx->Q, nbits >> 1, 0,
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f_rng, p_rng ) );
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if( mpi_cmp_mpi( &ctx->P, &ctx->Q ) < 0 )
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mpi_swap( &ctx->P, &ctx->Q );
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if( mpi_cmp_mpi( &ctx->P, &ctx->Q ) == 0 )
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continue;
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