diff options
Diffstat (limited to 'set3')
114 files changed, 304 insertions, 0 deletions
diff --git a/set3/task17.c b/set3/task17.c new file mode 100644 index 0000000..d2bb7e0 --- /dev/null +++ b/set3/task17.c @@ -0,0 +1,59 @@ +#include "../lib/lib.h" +#include "../lib/lib2.h" +#include "../lib/lib3.h" +#include <time.h> + +/** + * First we try to break the last byte of a block. + * Do this by trying every byte + * + * Good description of the attack: + * https://blog.cloudflare.com/padding-oracles-and-the-decline-of-cbc-mode-ciphersuites/ + */ + +#define BLOCKSIZE 16 +int main() +{ + // intialize + srand(time(NULL)); + generate_random_bytes(key, 16); + generate_random_bytes(iv, 16); + + int length = 0, i; + char *encrypted = challenge17_encrypt(&length); + + // detecting the length of the padding (need at least two blocks) + int nr_blocks = length / BLOCKSIZE; + nr_blocks--; + + printf("length: %i, blocks: %i\n", length, nr_blocks); + + char *tmp = malloc(length); + char *decrypted = malloc(length);; + memset(decrypted, 0xAA, length); + // try to break the last byte of the first block + char j; + int k; + for(k=nr_blocks-1;k>=0;k--) { + memcpy(tmp, encrypted, length); + printf("k is %i\n", k); + for(j=1;j<=BLOCKSIZE;j++) { + // created the right padding for the last j bytes + for(i=1;i<j;i++) + tmp[(k*BLOCKSIZE)+BLOCKSIZE-i] = decrypted[((k+1)*BLOCKSIZE)+BLOCKSIZE-i] ^ encrypted[(k*BLOCKSIZE)+BLOCKSIZE-i] ^ j; + + for(i=0;i<256;i++) { + // cbc bit flipping + tmp[(k*BLOCKSIZE)+BLOCKSIZE-j] = i; + // retursn 1 if paddign is valid + if(cbc_padding_oracle(&tmp[k*BLOCKSIZE], 2*BLOCKSIZE)) { + // 0x01 for the last padding byte, next step it is 0x02 + decrypted[((k+1)*BLOCKSIZE)+BLOCKSIZE-j] = (char) (i ^ (encrypted[(k*BLOCKSIZE)+BLOCKSIZE-j]) ^ j); + printf("got a hit %c\n", decrypted[((k+1)*BLOCKSIZE)+BLOCKSIZE-j+1]); + break; + } + } + } + } + printf("recovered plaintext: %s\n", &decrypted[BLOCKSIZE]); +} diff --git a/set3/task17_0 b/set3/task17_0 new file mode 100644 index 0000000..3cde4d1 --- /dev/null +++ b/set3/task17_0 @@ -0,0 +1 @@ +MDAwMDAwTm93IHRoYXQgdGhlIHBhcnR5IGlzIGp1bXBpbmc= diff --git a/set3/task17_1 b/set3/task17_1 new file mode 100644 index 0000000..2ba2eaa --- /dev/null +++ b/set3/task17_1 @@ -0,0 +1 @@ +MDAwMDAxV2l0aCB0aGUgYmFzcyBraWNrZWQgaW4gYW5kIHRoZSBWZWdhJ3MgYXJlIHB1bXBpbic= diff --git a/set3/task17_2 b/set3/task17_2 new file mode 100644 index 0000000..0cc5bce --- /dev/null +++ b/set3/task17_2 @@ -0,0 +1 @@ +MDAwMDAyUXVpY2sgdG8gdGhlIHBvaW50LCB0byB0aGUgcG9pbnQsIG5vIGZha2luZw== diff --git a/set3/task17_3 b/set3/task17_3 new file mode 100644 index 0000000..b10f8d4 --- /dev/null +++ b/set3/task17_3 @@ -0,0 +1 @@ +MDAwMDAzQ29va2luZyBNQydzIGxpa2UgYSBwb3VuZCBvZiBiYWNvbg== diff --git a/set3/task17_4 b/set3/task17_4 new file mode 100644 index 0000000..4765c7d --- /dev/null +++ b/set3/task17_4 @@ -0,0 +1 @@ +MDAwMDA0QnVybmluZyAnZW0sIGlmIHlvdSBhaW4ndCBxdWljayBhbmQgbmltYmxl diff --git a/set3/task17_5 b/set3/task17_5 new file mode 100644 index 0000000..5b99081 --- /dev/null +++ b/set3/task17_5 @@ -0,0 +1 @@ +MDAwMDA1SSBnbyBjcmF6eSB3aGVuIEkgaGVhciBhIGN5bWJhbA== diff --git a/set3/task17_6 b/set3/task17_6 new file mode 100644 index 0000000..1a5e976 --- /dev/null +++ b/set3/task17_6 @@ -0,0 +1 @@ +MDAwMDA2QW5kIGEgaGlnaCBoYXQgd2l0aCBhIHNvdXBlZCB1cCB0ZW1wbw== diff --git a/set3/task17_7 b/set3/task17_7 new file mode 100644 index 0000000..41f022f --- /dev/null +++ b/set3/task17_7 @@ -0,0 +1 @@ +MDAwMDA3SSdtIG9uIGEgcm9sbCwgaXQncyB0aW1lIHRvIGdvIHNvbG8= diff --git a/set3/task17_8 b/set3/task17_8 new file mode 100644 index 0000000..adb9041 --- /dev/null +++ b/set3/task17_8 @@ -0,0 +1 @@ +MDAwMDA4b2xsaW4nIGluIG15IGZpdmUgcG9pbnQgb2g= diff --git a/set3/task17_9 b/set3/task17_9 new file mode 100644 index 0000000..8dc72a5 --- /dev/null +++ b/set3/task17_9 @@ -0,0 +1 @@ +MDAwMDA5aXRoIG15IHJhZy10b3AgZG93biBzbyBteSBoYWlyIGNhbiBibG93 diff --git a/set3/task19.c b/set3/task19.c new file mode 100644 index 0000000..a036f4f --- /dev/null +++ b/set3/task19.c @@ -0,0 +1,35 @@ +#include "../lib/lib.h" +#include "../lib/lib2.h" +#include "../lib/lib3.h" +#include <time.h> + +#define CHALLENGE19_FILE_NR 40 +int main() +{ + int i; + char **file = malloc(sizeof(char *)*CHALLENGE19_FILE_NR); + int length_file[CHALLENGE19_FILE_NR]; + int length[CHALLENGE19_FILE_NR]; + char **plaintext= malloc(sizeof(char *)*CHALLENGE19_FILE_NR); + char **ciphertext= malloc(sizeof(char *)*CHALLENGE19_FILE_NR); + char filename[] = "./task19_data/task19_00"; + + char nonce[16]; + generate_random_bytes(key, 16); + generate_random_bytes(nonce, 16); + + for(i=0;i<CHALLENGE19_FILE_NR;i++) { + filename[strlen(filename)-1] = ((i % 10)+ '0'); + filename[strlen(filename)-2] = ((i / 10) + '0'); + length_file[i] = read_base64_file(filename, &file[i]); + plaintext[i] = malloc(length_file[i]); + length[i] = decode_base64(file[i], plaintext[i]); + printf("%s\n", plaintext[i]); + ciphertext[i] = malloc(length[i]); + aes_ctr(plaintext[i], length[i], ciphertext[i], key, nonce); + } + + // let the cracking begin + + +} diff --git a/set3/task19_data/task19_00 b/set3/task19_data/task19_00 new file mode 100644 index 0000000..ded873a --- /dev/null +++ b/set3/task19_data/task19_00 @@ -0,0 +1 @@ +SSBoYXZlIG1ldCB0aGVtIGF0IGNsb3NlIG9mIGRheQ== diff --git a/set3/task19_data/task19_01 b/set3/task19_data/task19_01 new file mode 100644 index 0000000..2ef0ae1 --- /dev/null +++ b/set3/task19_data/task19_01 @@ -0,0 +1 @@ +Q29taW5nIHdpdGggdml2aWQgZmFjZXM= diff --git a/set3/task19_data/task19_02 b/set3/task19_data/task19_02 new file mode 100644 index 0000000..a9b546e --- /dev/null +++ b/set3/task19_data/task19_02 @@ -0,0 +1 @@ +RnJvbSBjb3VudGVyIG9yIGRlc2sgYW1vbmcgZ3JleQ== diff --git a/set3/task19_data/task19_03 b/set3/task19_data/task19_03 new file mode 100644 index 0000000..2ea23fa --- /dev/null +++ b/set3/task19_data/task19_03 @@ -0,0 +1 @@ +RWlnaHRlZW50aC1jZW50dXJ5IGhvdXNlcy4= diff --git a/set3/task19_data/task19_04 b/set3/task19_data/task19_04 new file mode 100644 index 0000000..7ea2a43 --- /dev/null +++ b/set3/task19_data/task19_04 @@ -0,0 +1 @@ +SSBoYXZlIHBhc3NlZCB3aXRoIGEgbm9kIG9mIHRoZSBoZWFk diff --git a/set3/task19_data/task19_05 b/set3/task19_data/task19_05 new file mode 100644 index 0000000..ba3f268 --- /dev/null +++ b/set3/task19_data/task19_05 @@ -0,0 +1 @@ +T3IgcG9saXRlIG1lYW5pbmdsZXNzIHdvcmRzLA== diff --git a/set3/task19_data/task19_06 b/set3/task19_data/task19_06 new file mode 100644 index 0000000..a5e1a79 --- /dev/null +++ b/set3/task19_data/task19_06 @@ -0,0 +1 @@ +T3IgaGF2ZSBsaW5nZXJlZCBhd2hpbGUgYW5kIHNhaWQ= diff --git a/set3/task19_data/task19_07 b/set3/task19_data/task19_07 new file mode 100644 index 0000000..6b43132 --- /dev/null +++ b/set3/task19_data/task19_07 @@ -0,0 +1 @@ +UG9saXRlIG1lYW5pbmdsZXNzIHdvcmRzLA== diff --git a/set3/task19_data/task19_08 b/set3/task19_data/task19_08 new file mode 100644 index 0000000..8cc6a9a --- /dev/null +++ b/set3/task19_data/task19_08 @@ -0,0 +1 @@ +QW5kIHRob3VnaHQgYmVmb3JlIEkgaGFkIGRvbmU= diff --git a/set3/task19_data/task19_09 b/set3/task19_data/task19_09 new file mode 100644 index 0000000..b2c7bd8 --- /dev/null +++ b/set3/task19_data/task19_09 @@ -0,0 +1 @@ +T2YgYSBtb2NraW5nIHRhbGUgb3IgYSBnaWJl diff --git a/set3/task19_data/task19_10 b/set3/task19_data/task19_10 new file mode 100644 index 0000000..734f4d8 --- /dev/null +++ b/set3/task19_data/task19_10 @@ -0,0 +1 @@ +VG8gcGxlYXNlIGEgY29tcGFuaW9u diff --git a/set3/task19_data/task19_11 b/set3/task19_data/task19_11 new file mode 100644 index 0000000..a1f04b4 --- /dev/null +++ b/set3/task19_data/task19_11 @@ -0,0 +1 @@ +QXJvdW5kIHRoZSBmaXJlIGF0IHRoZSBjbHViLA== diff --git a/set3/task19_data/task19_12 b/set3/task19_data/task19_12 new file mode 100644 index 0000000..864a764 --- /dev/null +++ b/set3/task19_data/task19_12 @@ -0,0 +1 @@ +QmVpbmcgY2VydGFpbiB0aGF0IHRoZXkgYW5kIEk= diff --git a/set3/task19_data/task19_13 b/set3/task19_data/task19_13 new file mode 100644 index 0000000..23a2eb1 --- /dev/null +++ b/set3/task19_data/task19_13 @@ -0,0 +1 @@ +QnV0IGxpdmVkIHdoZXJlIG1vdGxleSBpcyB3b3JuOg== diff --git a/set3/task19_data/task19_14 b/set3/task19_data/task19_14 new file mode 100644 index 0000000..5865e2c --- /dev/null +++ b/set3/task19_data/task19_14 @@ -0,0 +1 @@ +QWxsIGNoYW5nZWQsIGNoYW5nZWQgdXR0ZXJseTo= diff --git a/set3/task19_data/task19_15 b/set3/task19_data/task19_15 new file mode 100644 index 0000000..cc8e0a4 --- /dev/null +++ b/set3/task19_data/task19_15 @@ -0,0 +1 @@ +QSB0ZXJyaWJsZSBiZWF1dHkgaXMgYm9ybi4= diff --git a/set3/task19_data/task19_16 b/set3/task19_data/task19_16 new file mode 100644 index 0000000..4db1ffe --- /dev/null +++ b/set3/task19_data/task19_16 @@ -0,0 +1 @@ +VGhhdCB3b21hbidzIGRheXMgd2VyZSBzcGVudA== diff --git a/set3/task19_data/task19_17 b/set3/task19_data/task19_17 new file mode 100644 index 0000000..64da3a8 --- /dev/null +++ b/set3/task19_data/task19_17 @@ -0,0 +1 @@ +SW4gaWdub3JhbnQgZ29vZCB3aWxsLA== diff --git a/set3/task19_data/task19_18 b/set3/task19_data/task19_18 new file mode 100644 index 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a/set3/task19_data/task19_23 b/set3/task19_data/task19_23 new file mode 100644 index 0000000..f6a3b04 --- /dev/null +++ b/set3/task19_data/task19_23 @@ -0,0 +1 @@ +VGhpcyBtYW4gaGFkIGtlcHQgYSBzY2hvb2w= diff --git a/set3/task19_data/task19_24 b/set3/task19_data/task19_24 new file mode 100644 index 0000000..cceb1bf --- /dev/null +++ b/set3/task19_data/task19_24 @@ -0,0 +1 @@ +QW5kIHJvZGUgb3VyIHdpbmdlZCBob3JzZS4= diff --git a/set3/task19_data/task19_25 b/set3/task19_data/task19_25 new file mode 100644 index 0000000..157f7f8 --- /dev/null +++ b/set3/task19_data/task19_25 @@ -0,0 +1 @@ +VGhpcyBvdGhlciBoaXMgaGVscGVyIGFuZCBmcmllbmQ= diff --git a/set3/task19_data/task19_26 b/set3/task19_data/task19_26 new file mode 100644 index 0000000..ccca06e --- /dev/null +++ b/set3/task19_data/task19_26 @@ -0,0 +1 @@ +V2FzIGNvbWluZyBpbnRvIGhpcyBmb3JjZTs= diff --git a/set3/task19_data/task19_27 b/set3/task19_data/task19_27 new file mode 100644 index 0000000..985b7a6 --- /dev/null +++ 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