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# file: rsasign.py
import cyassl
# start Random Number Generator
rng = cyassl.GetRng()
if rng == None:
print "Couldn't get an RNG"
exit(-1)
# load RSA private key in DER format
key = cyassl.GetRsaPrivateKey("../certs/client-key.der")
if key == None:
print "Couldn't load DER private key file"
exit(-1)
# Make byte Arrays and fill input
signOutput = cyassl.byteArray(128) # 128 allows 1024 bit private key
signStr = cyassl.byteArray(25) # input can't be larger then key size
# 64 for 512 bit 128 for 1024 bit
cyassl.FillSignStr(signStr, "Everybody gets Friday off", 25)
# Do RSA Sign
signedSize = cyassl.RsaSSL_Sign(signStr, 25, signOutput, 128, key, rng)
# Show output
print "Signed Size = ", signedSize, " signed array = ", cyassl.cdata(signOutput, signedSize)
# let's verify this worked
signVerify = cyassl.byteArray(signedSize)
verifySize = cyassl.RsaSSL_Verify(signOutput, signedSize, signVerify, signedSize, key)
print "Verify Size = ", verifySize, " verify array = ", cyassl.cdata(signVerify, verifySize)
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