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7d4cf5cedd
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Jochen Hoenicke 7d4cf5cedd Optimized the bn_inverse method. 
The new method needs about 30 % less time for prime256k1 and is about
twice as fast for other moduli.  The base algorithm is the same.
The code is also a bit smaller and doesn't need the 8 kb precomputed
table.

Important canges:
1. even/odd distinction so that we need to test only one of the numbers
   for being even.  This also leads to less duplicated code.
2. Allow for shifting by 32 bits at a time in the even test.
3. Pack u,s and v,r into the same array, which saves a bit of stack memory.
4. Don't divide by two after subtraction; this simplifies code.
5. Abort as soon as u,v are equal, instead of subtracting them.
6. Use s instead of r after the loop; no negation needed.
7. New code that divides by 2^k fast without any precomputed values.
2015-03-17 19:17:47 +01:00
gui add more checks for improbable cases; rework gui testing app 2014-08-07 18:35:54 +02:00
tools remove all references to USE_PUBKEY_VALIDATE 2015-03-12 15:53:41 +01:00
.gitignore prepare cython-TrezorCrypto for pip release 2015-01-12 19:11:43 +01:00
aes_modes.c rename aes_ctr_counter_inc to aes_ctr_cbuf_inc and move it to aes_modes.c 2014-06-07 14:16:27 +02:00
aes.h rename aes_ctr_counter_inc to aes_ctr_cbuf_inc and move it to aes_modes.c 2014-06-07 14:16:27 +02:00
aescrypt.c update AES code to support different modes of operation, add unittests 2014-06-07 13:38:56 +02:00
aeskey.c update AES code to support different modes of operation, add unittests 2014-06-07 13:38:56 +02:00
aesopt.h don't include aescpp.h 2014-07-24 15:26:50 +02:00
aestab.c update AES code to support different modes of operation, add unittests 2014-06-07 13:38:56 +02:00
aestab.h update AES code to support different modes of operation, add unittests 2014-06-07 13:38:56 +02:00
AUTHORS import sources 2013-08-17 14:20:15 +02:00
base58.c replace base58 implementation 2014-12-23 03:11:58 +01:00
base58.h Add stdbool.h 2015-01-23 12:12:40 -08:00
bignum.c Optimized the bn_inverse method. 2015-03-17 19:17:47 +01:00
bignum.h bn_substract -> bn_subtractmod, bn_substract_noprime -> bn_subtract 2015-03-17 14:19:50 +01:00
bip32.c remove all references to USE_PUBKEY_VALIDATE 2015-03-12 15:53:41 +01:00
bip32.h add stdlib to header 2015-01-26 19:12:22 +01:00
bip39_english.h Make word list const 2015-02-14 12:00:44 +01:00
bip39.c Make word list const 2015-02-14 12:00:44 +01:00
bip39.h Make word list const 2015-02-14 12:00:44 +01:00
c.pxd prepare cython-TrezorCrypto for pip release 2015-01-12 19:11:43 +01:00
CMakeLists.txt Make test build optional in CMake 2014-07-17 12:51:00 -05:00
ecdsa.c bn_substract -> bn_subtractmod, bn_substract_noprime -> bn_subtract 2015-03-17 14:19:50 +01:00
ecdsa.h Add prototypes for private functions 2015-01-23 12:12:40 -08:00
hmac.c fix copyright headers 2014-05-22 20:54:58 +02:00
hmac.h fix copyright headers 2014-05-22 20:54:58 +02:00
LICENSE import sources 2013-08-17 14:20:15 +02:00
Makefile remove all references to USE_PUBKEY_VALIDATE 2015-03-12 15:53:41 +01:00
MANIFEST.in prepare cython-TrezorCrypto for pip release 2015-01-12 19:11:43 +01:00
options.h Optimized the bn_inverse method. 2015-03-17 19:17:47 +01:00
pbkdf2.c split pbkdf2 into pbkdf2_hmac_sha256 and pbkdf2_hmac_sha512 2014-10-30 01:35:13 +01:00
pbkdf2.h split pbkdf2 into pbkdf2_hmac_sha256 and pbkdf2_hmac_sha512 2014-10-30 01:35:13 +01:00
rand.c Add finalize_rand() to prove we have no leaks 2015-01-23 06:05:38 -08:00
rand.h Add stdlib.h to header. Needed for size_t. 2015-01-27 21:44:48 -05:00
README.md README -> README.md 2014-12-24 01:27:20 +01:00
ripemd160.c use #if instead of #ifdef for conditional macros 2013-10-03 17:32:27 +02:00
ripemd160.h add ripemd160 2013-09-16 01:32:56 +02:00
secp256k1.c Optimized the bn_inverse method. 2015-03-17 19:17:47 +01:00
secp256k1.h Optimized the bn_inverse method. 2015-03-17 19:17:47 +01:00
setup.py remove all references to USE_PUBKEY_VALIDATE 2015-03-12 15:53:41 +01:00
sha2.c Remove unused static variable sha384_initial_hash_value. 2015-01-27 19:22:42 -05:00
sha2.h fix copyright headers 2014-05-22 20:54:58 +02:00
test-openssl.c export pby from ecdsa_sign functions 2014-12-08 21:08:49 +01:00
test.py prepare cython-TrezorCrypto for pip release 2015-01-12 19:11:43 +01:00
tests.c remove all references to USE_PUBKEY_VALIDATE 2015-03-12 15:53:41 +01:00
TrezorCrypto.pyx prepare cython-TrezorCrypto for pip release 2015-01-12 19:11:43 +01:00

README.md

trezor-crypto

Heavily optimized cryptography algorithms for embedded devices.

These include:

  • AES/Rijndael encryption/decryption
  • Big Number (256 bit) Arithmetics
  • BIP32 Hierarchical Deterministic Wallets
  • BIP39 Mnemonic code
  • ECDSA signing/verifying (only hardcoded secp256k1 curve, uses RFC6979 for deterministic signatures)
  • ECDSA public key derivation + Base58 address representation
  • HMAC-SHA256 and HMAC-SHA512
  • PBKDF2
  • RIPEMD-160
  • SHA256/SHA512
  • unit tests (using Check - check.sf.net; in tests.c)
  • tests against OpenSSL (in test-openssl.c)

Distibuted under MIT License.