GuillaumeCisco commented on issue #38: Python wrappers URL: https://github.com/apache/incubator-milagro-crypto-c/issues/38#issuecomment-521572957 Ok I succeeded runing this example, on a fresh environment, using these steps: `sudo apt-get install -y git cmake build-essential python python-dev python-pip libffi-dev doxygen doxygen-latex parallel ` `pip install cffi` (in a virtual env) Do not modify config.mk `make` `cd target/default` `sudo make install` (sudo is important for installing in /usr/... folders) `cp ./example_bls_BLS381.c /tmp` `cd /tmp` Edit `example_bls_BLS381.c` for replacing imports" ``` #include "config_curve_BLS381.h" #include "randapi.h" #if CURVE_SECURITY_BLS381 == 128 #include "bls_BLS381.h" #elif CURVE_SECURITY_BLS381 == 192 #include "bls192_BLS381.h" #elif CURVE_SECURITY_BLS381 == 256 #include "bls256_BLS381.h" #endif ``` to ``` #include <amcl/config_curve_BLS381.h> #include <amcl/randapi.h> #if CURVE_SECURITY_BLS381 == 128 #include <amcl/bls_BLS381.h> #elif CURVE_SECURITY_BLS381 == 192 #include <amcl/bls192_BLS381.h> #elif CURVE_SECURITY_BLS381 == 256 #include <amcl/bls256_BLS381.h> #endif ``` Then compile it" `gcc -O0 -g ./example_bls_BLS381.c $(pkg-config --libs --cflags amcl) -o example_bls_BLS381` Try it: ``` $> ./example_bls_BLS381 ./example_bls_BLS381: error while loading shared libraries: libamcl_core.so.1: cannot open shared object file: No such file or directory ``` Find where is `libamcl_core.so`. ``` $> sudo find / -name libamcl_core.so /usr/local/lib/libamcl_core.so ``` exporting library `export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib/` Try again: ``` ./example_bls_BLS381 SEED: 78d0fb6705ce77dee47d03eb5b9c5d30 Testing BLS signature for curve BLS381 Private key SK1: 000000000000000000000000000000001ab4d90898292c30524488630453308cd2fa1f9d76c15f98b1025138f81bf1da Public key PKTMP: 0f0bcdc9de4968355e30302ef97e8ec0dd344f87aeb35f6c556dc810a0a506a7aa5e8a4ae3063ad7de241511445e708006796e2ba3b366fda588937fa5cead3a9b6e0e6c29eb328339cd1afb3e0c838f39d2a5f438122c35529658cccd789c700f33fd318079ec077f7c17b89d5c94feffff1d3fab02cde565854a93458dce002241281a7e2d9f58d8a88952fc7fe0260991bc6c2971004a78c9724a18f5fa4c4995b2a2697b9cb0d0adddfae6f500b0732173f092971cbaaaba13c8ffb4ec09 Public key PK1: 0f0bcdc9de4968355e30302ef97e8ec0dd344f87aeb35f6c556dc810a0a506a7aa5e8a4ae3063ad7de241511445e708006796e2ba3b366fda588937fa5cead3a9b6e0e6c29eb328339cd1afb3e0c838f39d2a5f438122c35529658cccd789c700f33fd318079ec077f7c17b89d5c94feffff1d3fab02cde565854a93458dce002241281a7e2d9f58d8a88952fc7fe0260991bc6c2971004a78c9724a18f5fa4c4995b2a2697b9cb0d0adddfae6f500b0732173f092971cbaaaba13c8ffb4ec09 Private key SK2: 000000000000000000000000000000002c78985d1620cf5f585fb95fa12643f35874f8ac3e27b1a72793244734eadb2b Public key PK2: 00e083bfbf91ccb04e332758ae84aecd23948b349a36d271e9444c04d2cd9263e4cd2b7df79187a71f2d2a2059524938169b09f3ce0e8be623ede589bb5b8d999d023222a20827089897217667b11d8d659bb42b1b55127659b5d2dda50af5eb0e7b36d785d1db7ffcfbbee023c6330ad39440bf8ed287657ea7a3b4b30445de1eb512f8764d3ce7b2a1aa6505e267d81155e430e7248c20ee62d7dc7836d1835f9c0cbf0d551f469ff2e2a7ffcaab46be00162e30e09a382f02396828bbabf9 Private key SK3: 000000000000000000000000000000002c78985d1620cf5f585fb95fa12643f35874f8ac3e27b1a72793244734eadb2b Public key PK3: 00e083bfbf91ccb04e332758ae84aecd23948b349a36d271e9444c04d2cd9263e4cd2b7df79187a71f2d2a2059524938169b09f3ce0e8be623ede589bb5b8d999d023222a20827089897217667b11d8d659bb42b1b55127659b5d2dda50af5eb0e7b36d785d1db7ffcfbbee023c6330ad39440bf8ed287657ea7a3b4b30445de1eb512f8764d3ce7b2a1aa6505e267d81155e430e7248c20ee62d7dc7836d1835f9c0cbf0d551f469ff2e2a7ffcaab46be00162e30e09a382f02396828bbabf9 SIG1: 0308be9a543a978c9a5b143fc8aed6482bdbe5f9dd969693b65c9b2bfdea25e1a611bcbf96f8899bfea06ef71c30bf70ad SIG2: 0216d5cbfd2e29445a42bfa7075a28fdf139d4d9c48f31c7233c8b9822929148bdf0fadf315f082c2377ed08cf5dd57f5b SIG3: 02082ab439b2c6d366199ae44fcdf72f15529a3af88f413a471196a69aaf65ccddf9ace8a9975426c6080148ca2d30ac9b Success: Signature is valid Success: Signature is valid Success: Signature is valid Public key PK: 08c2ead7baac23a8b648d6572fd2b3cfe06a0a3d31dafdde14f901fdc582be72647fcc088d33b923ddcc63eba62723e81403ce9283381ab0b56d398da01b7886064eb5679d164cd1fb2efcac21f56d19247d40b7a52a4e6463c792bfb41909f40b1024ffdf0a7fdfc4f92c437f00dde3ac8bbff6c6bbe65a8393aa488d6b5af7f7919acee8262eb240915619b95a65f4017785c554211282bd3d2478fcb236d4fa7c459a6a7b2067785d1a50ae00c9ea5a4921d80a41b8b26b7ce6f34d3a8b2a Error: Aggregated signature is invalid (expected result) SIG: 030b5620207d709e2991413830ba052fc15199731442f8b868217de7cceaa5406c27261c76eb942b426d0c031e8a349836 Success: Aggregated signature is valid message Zest message Error: Invalid Signature (expected result) message test message Signature SIG1: 0508be9a543a978c9a5b143fc8aed6482bdbe5f9dd969693b65c9b2bfdea25e1a611bcbf96f8899bfea06ef71c30bf70ad Error: Invalid Signature (expected result) ``` It works as expected! Now we can finally work on the part I'm looking at, the linking between C and python. Creating a shared library instead of an executable" `gcc -O0 -g ./example_bls_BLS381.c $(pkg-config --libs --cflags amcl) --shared -o example_bls_BLS381.so` Creating the python file example_bls_BLS381.py: ``` import cffi ffi = cffi.FFI() ffi.cdef(""" int main(); """) lib = ffi.dlopen("/tmp/example_bls_BLS381.so") lib.main() ``` Testing: ``` python example_bls_BLS381.py SEED: 78d0fb6705ce77dee47d03eb5b9c5d30 Testing BLS signature for curve BLS381 Private key SK1: 000000000000000000000000000000001ab4d90898292c30524488630453308cd2fa1f9d76c15f98b1025138f81bf1da Public key PKTMP: 0f0bcdc9de4968355e30302ef97e8ec0dd344f87aeb35f6c556dc810a0a506a7aa5e8a4ae3063ad7de241511445e708006796e2ba3b366fda588937fa5cead3a9b6e0e6c29eb328339cd1afb3e0c838f39d2a5f438122c35529658cccd789c700f33fd318079ec077f7c17b89d5c94feffff1d3fab02cde565854a93458dce002241281a7e2d9f58d8a88952fc7fe0260991bc6c2971004a78c9724a18f5fa4c4995b2a2697b9cb0d0adddfae6f500b0732173f092971cbaaaba13c8ffb4ec09 Public key PK1: 0f0bcdc9de4968355e30302ef97e8ec0dd344f87aeb35f6c556dc810a0a506a7aa5e8a4ae3063ad7de241511445e708006796e2ba3b366fda588937fa5cead3a9b6e0e6c29eb328339cd1afb3e0c838f39d2a5f438122c35529658cccd789c700f33fd318079ec077f7c17b89d5c94feffff1d3fab02cde565854a93458dce002241281a7e2d9f58d8a88952fc7fe0260991bc6c2971004a78c9724a18f5fa4c4995b2a2697b9cb0d0adddfae6f500b0732173f092971cbaaaba13c8ffb4ec09 Private key SK2: 000000000000000000000000000000002c78985d1620cf5f585fb95fa12643f35874f8ac3e27b1a72793244734eadb2b Public key PK2: 00e083bfbf91ccb04e332758ae84aecd23948b349a36d271e9444c04d2cd9263e4cd2b7df79187a71f2d2a2059524938169b09f3ce0e8be623ede589bb5b8d999d023222a20827089897217667b11d8d659bb42b1b55127659b5d2dda50af5eb0e7b36d785d1db7ffcfbbee023c6330ad39440bf8ed287657ea7a3b4b30445de1eb512f8764d3ce7b2a1aa6505e267d81155e430e7248c20ee62d7dc7836d1835f9c0cbf0d551f469ff2e2a7ffcaab46be00162e30e09a382f02396828bbabf9 Private key SK3: 000000000000000000000000000000002c78985d1620cf5f585fb95fa12643f35874f8ac3e27b1a72793244734eadb2b Public key PK3: 00e083bfbf91ccb04e332758ae84aecd23948b349a36d271e9444c04d2cd9263e4cd2b7df79187a71f2d2a2059524938169b09f3ce0e8be623ede589bb5b8d999d023222a20827089897217667b11d8d659bb42b1b55127659b5d2dda50af5eb0e7b36d785d1db7ffcfbbee023c6330ad39440bf8ed287657ea7a3b4b30445de1eb512f8764d3ce7b2a1aa6505e267d81155e430e7248c20ee62d7dc7836d1835f9c0cbf0d551f469ff2e2a7ffcaab46be00162e30e09a382f02396828bbabf9 SIG1: 0308be9a543a978c9a5b143fc8aed6482bdbe5f9dd969693b65c9b2bfdea25e1a611bcbf96f8899bfea06ef71c30bf70ad SIG2: 0216d5cbfd2e29445a42bfa7075a28fdf139d4d9c48f31c7233c8b9822929148bdf0fadf315f082c2377ed08cf5dd57f5b SIG3: 02082ab439b2c6d366199ae44fcdf72f15529a3af88f413a471196a69aaf65ccddf9ace8a9975426c6080148ca2d30ac9b Success: Signature is valid Success: Signature is valid Success: Signature is valid Public key PK: 08c2ead7baac23a8b648d6572fd2b3cfe06a0a3d31dafdde14f901fdc582be72647fcc088d33b923ddcc63eba62723e81403ce9283381ab0b56d398da01b7886064eb5679d164cd1fb2efcac21f56d19247d40b7a52a4e6463c792bfb41909f40b1024ffdf0a7fdfc4f92c437f00dde3ac8bbff6c6bbe65a8393aa488d6b5af7f7919acee8262eb240915619b95a65f4017785c554211282bd3d2478fcb236d4fa7c459a6a7b2067785d1a50ae00c9ea5a4921d80a41b8b26b7ce6f34d3a8b2a Error: Aggregated signature is invalid (expected result) SIG: 030b5620207d709e2991413830ba052fc15199731442f8b868217de7cceaa5406c27261c76eb942b426d0c031e8a349836 Success: Aggregated signature is valid message Zest message Error: Invalid Signature (expected result) message test message Signature SIG1: 0508be9a543a978c9a5b143fc8aed6482bdbe5f9dd969693b65c9b2bfdea25e1a611bcbf96f8899bfea06ef71c30bf70ad Error: Invalid Signature (expected result) ``` It works as expected. I now need to tweak this example for being able to play with `CURVE_Order_FP256BN` I'm close :) Thanks again for these pieces of informations.
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