From: Dmitry Belyavskiy Date: Tue, 7 May 2019 13:02:18 +0000 (+0300) Subject: Decryption tests + formatting X-Git-Url: http://www.wagner.pp.ru/gitweb/?a=commitdiff_plain;h=9c135045fb5c3c28c97b33c532680b6eec5a45c3;p=openssl-gost%2Fengine.git Decryption tests + formatting --- diff --git a/test_mgm.c b/test_mgm.c index d6b5a74..d8b62d9 100644 --- a/test_mgm.c +++ b/test_mgm.c @@ -1,10 +1,59 @@ -# include -# include -# include -# include +#include +#include +#include +#include #include #include +const unsigned char gh_key[] = { + 0x88, 0x99, 0xAA, 0xBB, 0xCC, 0xDD, 0xEE, 0xFF, 0x00, 0x11, 0x22, 0x33, + 0x44, 0x55, 0x66, 0x77, + 0xFE, 0xDC, 0xBA, 0x98, 0x76, 0x54, 0x32, 0x10, 0x01, 0x23, 0x45, 0x67, + 0x89, 0xAB, 0xCD, 0xEF, +}; + +const unsigned char gh_nonce[] = { + 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x00, 0xFF, 0xEE, 0xDD, 0xCC, + 0xBB, 0xAA, 0x99, 0x88 +}; + +const unsigned char gh_adata[] = { + 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x01, 0x01, 0x01, 0x01, + 0x01, 0x01, 0x01, 0x01, + 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x03, 0x03, 0x03, 0x03, + 0x03, 0x03, 0x03, 0x03, + 0xEA, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05 +}; + +const unsigned char gh_pdata[] = { + 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x00, 0xFF, 0xEE, 0xDD, 0xCC, + 0xBB, 0xAA, 0x99, 0x88, + 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xAA, 0xBB, + 0xCC, 0xEE, 0xFF, 0x0A, + 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xAA, 0xBB, 0xCC, + 0xEE, 0xFF, 0x0A, 0x00, + 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xAA, 0xBB, 0xCC, 0xEE, + 0xFF, 0x0A, 0x00, 0x11, + 0xAA, 0xBB, 0xCC +}; + +const unsigned char etalon_cdata[] = { + 0xA9, 0x75, 0x7B, 0x81, 0x47, 0x95, 0x6E, 0x90, 0x55, 0xB8, 0xA3, 0x3D, + 0xE8, 0x9F, 0x42, 0xFC, + 0x80, 0x75, 0xD2, 0x21, 0x2B, 0xF9, 0xFD, 0x5B, 0xD3, 0xF7, 0x06, 0x9A, + 0xAD, 0xC1, 0x6B, 0x39, + 0x49, 0x7A, 0xB1, 0x59, 0x15, 0xA6, 0xBA, 0x85, 0x93, 0x6B, 0x5D, 0x0E, + 0xA9, 0xF6, 0x85, 0x1C, + 0xC6, 0x0C, 0x14, 0xD4, 0xD3, 0xF8, 0x83, 0xD0, 0xAB, 0x94, 0x42, 0x06, + 0x95, 0xC7, 0x6D, 0xEB, + 0x2C, 0x75, 0x52 +}; + +const unsigned char etalon_tag[] = { + 0xCF, 0x5D, 0x65, 0x6F, 0x40, 0xC3, 0x4F, 0x5C, 0x46, 0xE8, 0xBB, 0x0E, + 0x29, 0xFC, 0xDB, 0x4C +}; + static void hexdump(FILE *f, const char *title, const unsigned char *s, int l) { int n = 0; @@ -18,251 +67,299 @@ static void hexdump(FILE *f, const char *title, const unsigned char *s, int l) fprintf(f, "\n"); } -void grasshopper_mgm_big() +void grasshopper_enc_mgm_big(const EVP_CIPHER *ciph) { - const unsigned char gh_key[] = { -0x88, 0x99, 0xAA, 0xBB, 0xCC, 0xDD, 0xEE, 0xFF, 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, -0xFE, 0xDC, 0xBA, 0x98, 0x76, 0x54, 0x32, 0x10, 0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF, - }; - - const unsigned char gh_nonce[] = { - 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x00, 0xFF, 0xEE, 0xDD, 0xCC, 0xBB, 0xAA, 0x99, 0x88 - }; - - const unsigned char gh_adata[] = { - 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, - 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, - 0xEA, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05 - }; - - const unsigned char gh_pdata[] = { - 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x00, 0xFF, 0xEE, 0xDD, 0xCC, 0xBB, 0xAA, 0x99, 0x88, - 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xAA, 0xBB, 0xCC, 0xEE, 0xFF, 0x0A, - 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xAA, 0xBB, 0xCC, 0xEE, 0xFF, 0x0A, 0x00, - 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xAA, 0xBB, 0xCC, 0xEE, 0xFF, 0x0A, 0x00, 0x11, - 0xAA, 0xBB, 0xCC - }; - - const unsigned char etalon_tag[] = { - 0xCF, 0x5D, 0x65, 0x6F, 0x40, 0xC3, 0x4F, 0x5C, 0x46, 0xE8, 0xBB, 0x0E, 0x29, 0xFC, 0xDB, 0x4C - }; - - unsigned char tag[16]; - unsigned char gh_cdata[sizeof(gh_pdata)]; - unsigned char *pcdata = gh_cdata; - - int asize = sizeof(gh_adata); - int psize = sizeof(gh_pdata); - int fsize = 0; - - const EVP_CIPHER *ciph; - EVP_CIPHER_CTX *enc = NULL; - - int i; - - ciph = EVP_get_cipherbynid(NID_kuznyechik_mgm); - if (ciph == NULL) { - fprintf(stderr, "Could not obtain cipher"); - return; - } - - enc = EVP_CIPHER_CTX_new(); - EVP_EncryptInit_ex(enc, ciph, NULL, gh_key, gh_nonce); - - EVP_EncryptUpdate(enc, NULL, &asize, gh_adata, sizeof(gh_adata)); - EVP_EncryptUpdate(enc, gh_cdata, &psize, gh_pdata, sizeof(gh_pdata)); - EVP_EncryptFinal_ex(enc, NULL, &fsize); - - EVP_CIPHER_CTX_ctrl(enc, EVP_CTRL_AEAD_GET_TAG, 16, tag); - - if (memcmp (tag, etalon_tag, 16)) { - fprintf(stderr, "Shit happens!\n"); - hexdump(stderr, "Etalon tag", etalon_tag, 16); - hexdump(stderr, "Got tag", tag, 16); - return; - } - fprintf(stderr, "OK - big chunks!\n"); - EVP_CIPHER_CTX_free(enc); - - fprintf(stderr, "================ \n"); + unsigned char tag[16]; + unsigned char gh_cdata[sizeof(gh_pdata)]; + unsigned char *pcdata = gh_cdata; + + int asize = sizeof(gh_adata); + int psize = sizeof(gh_pdata); + int fsize = 0; + + EVP_CIPHER_CTX *enc = NULL; + + int i; + + enc = EVP_CIPHER_CTX_new(); + EVP_EncryptInit_ex(enc, ciph, NULL, gh_key, gh_nonce); + + EVP_EncryptUpdate(enc, NULL, &asize, gh_adata, sizeof(gh_adata)); + EVP_EncryptUpdate(enc, gh_cdata, &psize, gh_pdata, sizeof(gh_pdata)); + EVP_EncryptFinal_ex(enc, NULL, &fsize); + + EVP_CIPHER_CTX_ctrl(enc, EVP_CTRL_AEAD_GET_TAG, 16, tag); + + if (memcmp(etalon_cdata, gh_cdata, sizeof(gh_cdata))) { + fprintf(stderr, "Shit happens - encryption!\n"); + hexdump(stderr, "Etalon cdata", etalon_cdata, sizeof(etalon_cdata)); + hexdump(stderr, "Got cdata", gh_cdata, sizeof(gh_cdata)); + return; + } + + if (memcmp(tag, etalon_tag, 16)) { + fprintf(stderr, "Shit happens!\n"); + hexdump(stderr, "Etalon tag", etalon_tag, 16); + hexdump(stderr, "Got tag", tag, 16); + return; + } + fprintf(stderr, "OK encryption - big chunks!\n"); + EVP_CIPHER_CTX_free(enc); } -void grasshopper_mgm_small() +void grasshopper_enc_mgm_small(const EVP_CIPHER *ciph) { - const unsigned char gh_key[] = { -0x88, 0x99, 0xAA, 0xBB, 0xCC, 0xDD, 0xEE, 0xFF, 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, -0xFE, 0xDC, 0xBA, 0x98, 0x76, 0x54, 0x32, 0x10, 0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF, - }; - - const unsigned char gh_nonce[] = { - 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x00, 0xFF, 0xEE, 0xDD, 0xCC, 0xBB, 0xAA, 0x99, 0x88 - }; - - const unsigned char gh_adata[] = { - 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, - 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, - 0xEA, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05 - }; - - const unsigned char gh_pdata[] = { - 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x00, 0xFF, 0xEE, 0xDD, 0xCC, 0xBB, 0xAA, 0x99, 0x88, - 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xAA, 0xBB, 0xCC, 0xEE, 0xFF, 0x0A, - 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xAA, 0xBB, 0xCC, 0xEE, 0xFF, 0x0A, 0x00, - 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xAA, 0xBB, 0xCC, 0xEE, 0xFF, 0x0A, 0x00, 0x11, - 0xAA, 0xBB, 0xCC - }; - - const unsigned char etalon_tag[] = { - 0xCF, 0x5D, 0x65, 0x6F, 0x40, 0xC3, 0x4F, 0x5C, 0x46, 0xE8, 0xBB, 0x0E, 0x29, 0xFC, 0xDB, 0x4C - }; - - unsigned char tag[16]; - unsigned char gh_cdata[sizeof(gh_pdata)]; - unsigned char *pcdata = gh_cdata; - - int asize = sizeof(gh_adata); - int psize = sizeof(gh_pdata); - int fsize = 0; - - const EVP_CIPHER *ciph; - EVP_CIPHER_CTX *enc = NULL; - - int i; - - ciph = EVP_get_cipherbynid(NID_kuznyechik_mgm); - if (ciph == NULL) { - fprintf(stderr, "Could not obtain cipher"); - return; - } - - enc = EVP_CIPHER_CTX_new(); - EVP_EncryptInit_ex(enc, ciph, NULL, gh_key, gh_nonce); - - for (i = 0; i < sizeof(gh_adata); i++) - { - asize = 1; - EVP_EncryptUpdate(enc, NULL, &asize, gh_adata+i, 1); - } - - for (i = 0; i < sizeof(gh_pdata); i++) - { - psize = 1; - EVP_EncryptUpdate(enc, pcdata, &psize, gh_pdata+i, 1); - pcdata += psize; - } - - EVP_EncryptFinal_ex(enc, NULL, &fsize); - - EVP_CIPHER_CTX_ctrl(enc, EVP_CTRL_AEAD_GET_TAG, 16, tag); - - if (memcmp (tag, etalon_tag, 16)) { - fprintf(stderr, "Shit happens!\n"); - hexdump(stderr, "Etalon tag", etalon_tag, 16); - hexdump(stderr, "Got tag", tag, 16); - return; - } - fprintf(stderr, "OK - small chunks!\n"); - EVP_CIPHER_CTX_free(enc); + unsigned char tag[16]; + unsigned char gh_cdata[sizeof(gh_pdata)]; + unsigned char *pcdata = gh_cdata; + + int asize = sizeof(gh_adata); + int psize = sizeof(gh_pdata); + int fsize = 0; + + EVP_CIPHER_CTX *enc = NULL; + + int i; + + enc = EVP_CIPHER_CTX_new(); + EVP_EncryptInit_ex(enc, ciph, NULL, gh_key, gh_nonce); + for (i = 0; i < sizeof(gh_adata); i++) { + asize = 1; + EVP_EncryptUpdate(enc, NULL, &asize, gh_adata + i, 1); + } + for (i = 0; i < sizeof(gh_pdata); i++) { + psize = 1; + EVP_EncryptUpdate(enc, pcdata, &psize, gh_pdata + i, 1); + pcdata += psize; + } + + EVP_EncryptFinal_ex(enc, NULL, &fsize); + + EVP_CIPHER_CTX_ctrl(enc, EVP_CTRL_AEAD_GET_TAG, 16, tag); + + if (memcmp(etalon_cdata, gh_cdata, sizeof(gh_cdata))) { + fprintf(stderr, "Shit happens - encryption!\n"); + hexdump(stderr, "Etalon cdata", etalon_cdata, sizeof(etalon_cdata)); + hexdump(stderr, "Got cdata", gh_cdata, sizeof(gh_cdata)); + return; + } + + if (memcmp(tag, etalon_tag, 16)) { + fprintf(stderr, "Shit happens!\n"); + hexdump(stderr, "Etalon tag", etalon_tag, 16); + hexdump(stderr, "Got tag", tag, 16); + return; + } + fprintf(stderr, "OK encryption - small chunks!\n"); + EVP_CIPHER_CTX_free(enc); } #define L_ENDIAN 1 static void gf128_mul_uint64(uint64_t *z, uint64_t *x, uint64_t *y) { - int i = 0, n = 0; - uint64_t t, s0, s1; + int i = 0, n = 0; + uint64_t t, s0, s1; - BUF_reverse((unsigned char *)x, NULL, 16); - BUF_reverse((unsigned char *)y, NULL, 16); + BUF_reverse((unsigned char *)x, NULL, 16); + BUF_reverse((unsigned char *)y, NULL, 16); #ifdef L_ENDIAN - s0 = x[0]; - s1 = x[1]; + s0 = x[0]; + s1 = x[1]; #else - s0 = bswap_64(x[0]); - s1 = bswap_64(x[1]); + s0 = bswap_64(x[0]); + s1 = bswap_64(x[1]); #endif - memset(z, 0, sizeof(uint64_t)*2); + memset(z, 0, sizeof(uint64_t) * 2); - /* lower half */ + /* lower half */ #ifdef L_ENDIAN - t = y[0]; + t = y[0]; #else - t = bswap_64(y[0]); + t = bswap_64(y[0]); #endif - for( i = 0; i < 64; i++ ) { - if( t&0x1 ) { z[0] ^= s0; z[1] ^= s1; } - t >>= 1; - n = s1 >> 63; - s1 <<= 1; s1 ^= ( s0 >> 63 ); s0 <<= 1; - if(n) s0 ^= 0x87; - } + for (i = 0; i < 64; i++) { + if (t & 0x1) { + z[0] ^= s0; + z[1] ^= s1; + } + t >>= 1; + n = s1 >> 63; + s1 <<= 1; + s1 ^= (s0 >> 63); + s0 <<= 1; + if (n) + s0 ^= 0x87; + } - /* upper half */ + /* upper half */ #ifdef L_ENDIAN - t = y[1]; + t = y[1]; #else - t = bswap_64(y[1]); + t = bswap_64(y[1]); #endif - for( i = 0; i < 63; i++ ) { - if( t&0x1 ) { z[0] ^= s0; z[1] ^= s1; } - t >>= 1; - n = s1 >> 63; - s1 <<= 1; s1 ^= ( s0 >> 63 ); s0 <<= 1; - if( n ) s0 ^= 0x87; - } - - if( t&0x1 ) { - z[0] ^= s0; - z[1] ^= s1; - } + for (i = 0; i < 63; i++) { + if (t & 0x1) { + z[0] ^= s0; + z[1] ^= s1; + } + t >>= 1; + n = s1 >> 63; + s1 <<= 1; + s1 ^= (s0 >> 63); + s0 <<= 1; + if (n) + s0 ^= 0x87; + } + + if (t & 0x1) { + z[0] ^= s0; + z[1] ^= s1; + } #ifndef L_ENDIAN - z[0] = bswap_64(z[0]); - z[1] = bswap_64(z[1]); + z[0] = bswap_64(z[0]); + z[1] = bswap_64(z[1]); #endif - BUF_reverse((unsigned char *)z, NULL, 16); + BUF_reverse((unsigned char *)z, NULL, 16); } void gf_mul(void) { - unsigned char H[16] = { - 0x8D, 0xB1, 0x87, 0xD6, 0x53, 0x83, 0x0E, 0xA4, 0xBC, 0x44, 0x64, 0x76, 0x95, 0x2C, 0x30, 0x0B - }; + unsigned char H[16] = { + 0x8D, 0xB1, 0x87, 0xD6, 0x53, 0x83, 0x0E, 0xA4, 0xBC, 0x44, 0x64, 0x76, + 0x95, 0x2C, 0x30, 0x0B + }; + + unsigned char A[16] = { + 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x01, 0x01, 0x01, 0x01, + 0x01, 0x01, 0x01, 0x01 + }; + + unsigned char etalon[16] = { + 0x4C, 0xF4, 0x27, 0xF4, 0xAD, 0xB7, 0x5C, 0xF4, 0xC0, 0xDA, 0x39, 0xD5, + 0xAB, 0x48, 0xCF, 0x38 + }; + + unsigned char result_bd[16]; + gf128_mul_uint64((uint64_t *)result_bd, (uint64_t *)H, (uint64_t *)A); + + hexdump(stderr, "Etalon", etalon, 16); + + if (memcmp(etalon, result_bd, 16)) { + fprintf(stderr, "Shit happens - BD!\n"); + hexdump(stderr, "Result - BD", result_bd, 16); + } else + fprintf(stderr, "OK - BD!\n"); + + return; +} + +void grasshopper_dec_mgm_big(const EVP_CIPHER *ciph) +{ + unsigned char tag[16]; + unsigned char gh_cdata[sizeof(gh_pdata)]; + unsigned char *pcdata = gh_cdata; - unsigned char A[16] = { - 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01 - }; + int asize = sizeof(gh_adata); + int psize = sizeof(gh_pdata); + int fsize = 0; - unsigned char etalon[16] = { - 0x4C, 0xF4, 0x27, 0xF4, 0xAD, 0xB7, 0x5C, 0xF4, 0xC0, 0xDA, 0x39, 0xD5, 0xAB, 0x48, 0xCF, 0x38 - }; + EVP_CIPHER_CTX *enc = NULL; - unsigned char result_bd[16]; - gf128_mul_uint64((uint64_t *)result_bd, (uint64_t *)H, (uint64_t *)A); + int i; + memcpy(tag, etalon_tag, 16); - hexdump(stderr, "Etalon", etalon, 16); + enc = EVP_CIPHER_CTX_new(); + EVP_DecryptInit_ex(enc, ciph, NULL, gh_key, gh_nonce); + EVP_CIPHER_CTX_ctrl(enc, EVP_CTRL_AEAD_SET_TAG, 16, tag); - if (memcmp (etalon, result_bd, 16)) { - fprintf(stderr, "Shit happens - BD!\n"); - hexdump(stderr, "Result - BD", result_bd, 16); - } else - fprintf(stderr, "OK - BD!\n"); + EVP_DecryptUpdate(enc, NULL, &asize, gh_adata, sizeof(gh_adata)); + EVP_DecryptUpdate(enc, gh_cdata, &psize, etalon_cdata, + sizeof(etalon_cdata)); - return; + if (EVP_DecryptFinal_ex(enc, NULL, &fsize) <= 0) { + fprintf(stderr, "Shit happens - bad tag!\n"); + return; + } + + if (memcmp(gh_pdata, gh_cdata, sizeof(gh_cdata))) { + fprintf(stderr, "Shit happens - decryption!\n"); + hexdump(stderr, "Etalon cdata", gh_pdata, sizeof(gh_pdata)); + hexdump(stderr, "Got cdata", gh_cdata, sizeof(gh_cdata)); + return; + } + + fprintf(stderr, "OK decryption - big chunks!\n"); + EVP_CIPHER_CTX_free(enc); } -int main(void) +void grasshopper_dec_mgm_small(const EVP_CIPHER *ciph) { - OPENSSL_init_crypto(OPENSSL_INIT_LOAD_CONFIG, NULL); + unsigned char tag[16]; + unsigned char gh_cdata[sizeof(gh_pdata)]; + unsigned char *pcdata = gh_cdata; + + int asize = sizeof(gh_adata); + int psize = sizeof(gh_pdata); + int fsize = 0; + + EVP_CIPHER_CTX *enc = NULL; + + int i; - gf_mul(); - grasshopper_mgm_big(); - grasshopper_mgm_small(); - ERR_print_errors_fp(stderr); + memcpy(tag, etalon_tag, 16); - return 0; + enc = EVP_CIPHER_CTX_new(); + EVP_DecryptInit_ex(enc, ciph, NULL, gh_key, gh_nonce); + EVP_CIPHER_CTX_ctrl(enc, EVP_CTRL_AEAD_SET_TAG, 16, tag); + + for (i = 0; i < sizeof(gh_adata); i++) { + asize = 1; + EVP_DecryptUpdate(enc, NULL, &asize, gh_adata + i, 1); + } + for (i = 0; i < sizeof(gh_pdata); i++) { + psize = 1; + EVP_DecryptUpdate(enc, pcdata, &psize, etalon_cdata + i, 1); + pcdata += psize; + } + + if (EVP_DecryptFinal_ex(enc, NULL, &fsize) <= 0) { + fprintf(stderr, "Shit happens - bad tag!\n"); + return; + } + + if (memcmp(gh_pdata, gh_cdata, sizeof(gh_cdata))) { + fprintf(stderr, "Shit happens - decryption!\n"); + hexdump(stderr, "Etalon cdata", gh_pdata, sizeof(gh_pdata)); + hexdump(stderr, "Got cdata", gh_cdata, sizeof(gh_cdata)); + return; + } + + fprintf(stderr, "OK decryption - small chunks!\n"); + EVP_CIPHER_CTX_free(enc); +} + +int main(void) +{ + OPENSSL_init_crypto(OPENSSL_INIT_LOAD_CONFIG, NULL); + + const EVP_CIPHER *ciph; + ciph = EVP_get_cipherbynid(NID_kuznyechik_mgm); + if (ciph == NULL) { + fprintf(stderr, "Could not obtain cipher"); + exit(1); + } +// gf_mul(); + grasshopper_enc_mgm_big(ciph); + grasshopper_enc_mgm_small(ciph); + grasshopper_dec_mgm_big(ciph); + grasshopper_dec_mgm_small(ciph); + ERR_print_errors_fp(stderr); + + return 0; }