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RSA Non-blocking Examples

Design

Enables RsaKey support for non-blocking exptmod operations by setting a non-blocking context using a new API wc_RsaSetNonBlock. If the operation is not complete it will return FP_WOULDBLOCK and requires being called again until success 0 or failure <0.

Example code is based on wolfCrypt test /wolfcrypt/test/test.c rsa_nb_test function.

Implementation

  • Adds RSA non-blocking support enabled with WC_RSA_NONBLOCK.
  • Adds new wc_RsaSetNonBlock function for enabling / non-block context.
  • Adds wolfCrypt test function rsa_nb_test to validate.
  • Adds RSA blocking time support using WC_RSA_NONBLOCK_TIME and wc_RsaSetNonBlockTime.

Code Added in GitHub pull requests:

Example RSA Non-block

This breaks RSA operations into smallest possible chunks of work.

Building wolfSSL

./autogen.sh
./configure --enable-fastmath CFLAGS="-DWC_RSA_NONBLOCK"
make
sudo make install

Building Example

make
gcc -o rsa-nb rsa-nb.c -Wall -I/usr/local/include -Os -L/usr/local/lib -lm -lwolfssl

Example Output

./rsa-nb
File ../../certs/client-key.der is 1192 bytes
RSA non-block sign: 8200 times
RSA non-block verify: 264 times

Example RSA Non-block with Time

This adds logic to estimate blocking time based on CPU speed and desired milliseconds to block.

Building wolfSSL

./autogen.sh
./configure --enable-fastmath CFLAGS="-DWC_RSA_NONBLOCK -DWC_RSA_NONBLOCK_TIME"
make
sudo make install

Building Example

make
gcc -o rsa-nb rsa-nb.c -Wall -I/usr/local/include -Os -L/usr/local/lib -lm -lwolfssl

Example Output

./rsa-nb
File ../../certs/client-key.der is 1192 bytes
CPU Speed is 3100000000, blocking ms 1
RSA non-block sign: 1 times
RSA non-block verify: 1 times

Debugging

  1. Build wolfSSL adding --enable-debug --disable-shared to the ./configure and do a sudo make install:
./configure --enable-fastmath CFLAGS="-DWC_RSA_NONBLOCK -DWC_RSA_NONBLOCK_TIME" --enable-debug --disable-shared
make
sudo make install
  1. Edit Makefile and edit lines 15 - 18 to be:
# Options
CFLAGS+=$(DEBUG_FLAGS)
#CFLAGS+=$(OPTIMIZE)
LIBS+=$(STATIC_LIB) -ldl -lm
#LIBS+=$(DYN_LIB)

make
gcc -o rsa-nb rsa-nb.c -Wall -I/usr/local/include -g -DDEBUG -L/usr/local/lib -lm /usr/local/lib/libwolfssl.a -ldl -lm
gdb ./rsa-nb
run

Support

For questions please email us at support@wolfssl.com.