Generate Hmac Sha256 Key C
Openssl Hmac Sha256
Feb 17, 2013 avr-crypto-lib / hmac-sha256 / hmac-sha256.c Find file Copy path bg global style change (now. is attached to identifier not to type) 3a9f9d9 Feb 17, 2013. Feb 17, 2013 avr-crypto-lib / hmac-sha256 / hmac-sha256.c Find file Copy path bg global style change (now. is attached to identifier not to type) 3a9f9d9 Feb 17, 2013.
Windows 7 professional key generator free download - Windows 7 Key Finder, Windows 7 (Professional), Product Key Viewer Professional, and many more programs. Dec 25, 2015 Windows 7 Professional Product Key Generator 32/64 Bit Free Download. Windows 7 Professional Product Key Generator is the best source to activate pirated or copied Windows 7 Professional. It is best for those Windows 7 that are not included product or activation keys in its pack. Nov 24, 2019 Windows 7 Product Key Generator 32/64 bit Working 100%. Windows 7 Product Key readily available for public use after three several years of the release of windows vista. It is completely updated and changed the system that is running the sooner incarnations of Windows. Windows 7 professional cd-key generator download. Windows 7 Product Key Generator Full Download 32-64 Bit by Leave a Comment Windows 7 Product Key Generator is fixed the most favorite operating system because of its excellent feature-wealthy environment, impressive start menu and most importantly its user-friendly interface, which makes it unique Windows operating system out there.
Join GitHub today
GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.
Sign upBranch:master
Generate Hmac Sha256 Key C Key
1 contributor
| /* |
| * hmac-sha256.c |
| * Copyright (C) 2017 Adrian Perez <aperez@igalia.com> |
| * |
| * Distributed under terms of the MIT license. |
| */ |
| #include'hmac-sha256.h' |
| #include'sha256/sha256.h' |
| #include'apicheck/apicheck.h' |
| /* |
| * HMAC(H, K) H(K ^ opad, H(K ^ ipad, text)) |
| * |
| * H: Hash function (sha256) |
| * K: Secret key |
| * B: Block byte length |
| * L: Byte length of hash function output |
| * |
| * https://tools.ietf.org/html/rfc2104 |
| */ |
| #defineB64 |
| #defineL (SHA256_DIGEST_SIZE) |
| #defineK (SHA256_DIGEST_SIZE * 2) |
| #defineI_PAD0x36 |
| #defineO_PAD0x5C |
| void |
| hmac_sha256 (uint8_t out[HMAC_SHA256_DIGEST_SIZE], |
| constuint8_t *data, size_t data_len, |
| constuint8_t *key, size_t key_len) |
| { |
| api_check_return (out); |
| api_check_return (data); |
| api_check_return (key); |
| api_check_return (key_len <= B); |
| sha256_t ss; |
| uint8_t kh[SHA256_DIGEST_SIZE]; |
| /* |
| * If the key length is bigger than the buffer size B, apply the hash |
| * function to it first and use the result instead. |
| */ |
| if (key_len > B) { |
| sha256_init (&ss); |
| sha256_update (&ss, key, key_len); |
| sha256_final (&ss, kh); |
| key_len = SHA256_DIGEST_SIZE; |
| key = kh; |
| } |
| /* |
| * (1) append zeros to the end of K to create a B byte string |
| * (e.g., if K is of length 20 bytes and B=64, then K will be |
| * appended with 44 zero bytes 0x00) |
| * (2) XOR (bitwise exclusive-OR) the B byte string computed in step |
| * (1) with ipad |
| */ |
| uint8_t kx[B]; |
| for (size_t i = 0; i < key_len; i++) kx[i] = I_PAD ^ key[i]; |
| for (size_t i = key_len; i < B; i++) kx[i] = I_PAD ^ 0; |
| /* |
| * (3) append the stream of data 'text' to the B byte string resulting |
| * from step (2) |
| * (4) apply H to the stream generated in step (3) |
| */ |
| sha256_init (&ss); |
| sha256_update (&ss, kx, B); |
| sha256_update (&ss, data, data_len); |
| sha256_final (&ss, out); |
| /* |
| * (5) XOR (bitwise exclusive-OR) the B byte string computed in |
| * step (1) with opad |
| * |
| * NOTE: The 'kx' variable is reused. |
| */ |
| for (size_t i = 0; i < key_len; i++) kx[i] = O_PAD ^ key[i]; |
| for (size_t i = key_len; i < B; i++) kx[i] = O_PAD ^ 0; |
| /* |
| * (6) append the H result from step (4) to the B byte string |
| * resulting from step (5) |
| * (7) apply H to the stream generated in step (6) and output |
| * the result |
| */ |
| sha256_init (&ss); |
| sha256_update (&ss, kx, B); |
| sha256_update (&ss, out, SHA256_DIGEST_SIZE); |
| sha256_final (&ss, out); |
| } |
Hmac Sha256 Online
Copy lines Copy permalink