From mboxrd@z Thu Jan 1 00:00:00 1970 From: GlovePuppet Date: Tue, 27 Oct 2020 08:43:31 -0700 (MST) Subject: [PATCH 1/2] Add HMAC-SHA-256 Message-ID: <1603813411162-0.post@n7.nabble.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de Required by TPM2 Extended Auth, cloned from sha1.c Signed-off-by: GlovePuppet --- include/u-boot/sha256.h | 13 +++++++++++++ lib/sha256.c | 40 ++++++++++++++++++++++++++++++++++++++++ 2 files changed, 53 insertions(+) diff --git a/include/u-boot/sha256.h b/include/u-boot/sha256.h index 9aa1251789..aa0e7f4418 100644 --- a/include/u-boot/sha256.h +++ b/include/u-boot/sha256.h @@ -22,4 +22,17 @@ void sha256_finish(sha256_context * ctx, uint8_t digest[SHA256_SUM_LEN]); void sha256_csum_wd(const unsigned char *input, unsigned int ilen, unsigned char *output, unsigned int chunk_sz); +/** + * \brief Output = HMAC-SHA-256( input buffer, hmac key ) + * + * \param key HMAC secret key + * \param keylen length of the HMAC key + * \param input buffer holding the data + * \param ilen length of the input data + * \param output HMAC-SHA-256 result + */ +void sha256_hmac(const unsigned char *key, int keylen, + const unsigned char *input, unsigned int ilen, + unsigned char *output); + #endif /* _SHA256_H */ diff --git a/lib/sha256.c b/lib/sha256.c index c1fe93de01..70123c1060 100644 --- a/lib/sha256.c +++ b/lib/sha256.c @@ -289,3 +289,43 @@ void sha256_csum_wd(const unsigned char *input, unsigned int ilen, sha256_finish(&ctx, output); } + +/* + * Output = HMAC-SHA-256( input buffer, hmac key ) + */ +void sha256_hmac(const unsigned char *key, int keylen, + const unsigned char *input, unsigned int ilen, + unsigned char *output) +{ + int i; + sha256_context ctx; + unsigned char k_ipad[64]; + unsigned char k_opad[64]; + unsigned char tmpbuf[32]; + + memset (k_ipad, 0x36, 64); + memset (k_opad, 0x5C, 64); + + for (i = 0; i < keylen; i++) { + if (i >= 64) + break; + + k_ipad[i] ^= key[i]; + k_opad[i] ^= key[i]; + } + + sha256_starts (&ctx); + sha256_update (&ctx, k_ipad, 64); + sha256_update (&ctx, input, ilen); + sha256_finish (&ctx, tmpbuf); + + sha256_starts (&ctx); + sha256_update (&ctx, k_opad, 64); + sha256_update (&ctx, tmpbuf, 32); + sha256_finish (&ctx, output); + + memset (k_ipad, 0, 64); + memset (k_opad, 0, 64); + memset (tmpbuf, 0, 32); + memset (&ctx, 0, sizeof (sha256_context)); +} -- 2.17.1 -- Sent from: http://u-boot.10912.n7.nabble.com/