From 9dffdcb12845d849693800b8f0fa3e6026d7c6a7 Mon Sep 17 00:00:00 2001 From: Ji Luo Date: Fri, 21 Jun 2019 08:52:40 +0800 Subject: MA-15015 Add sha256_hmac support Add sha256 hmac support in u-boot. Test: hmac calculation. Change-Id: I0f1438fed8290620a1bb0663d19c21e20098eb5a Signed-off-by: Ji Luo (cherry picked from 1e06de6ef23c1ae9d51383f3c57bb045ea180c03) (cherry picked from 3fc7a485b5098bec7fa22184da28a937a407192e) --- include/u-boot/sha256.h | 3 +++ lib/sha256.c | 40 ++++++++++++++++++++++++++++++++++++++++ 2 files changed, 43 insertions(+) diff --git a/include/u-boot/sha256.h b/include/u-boot/sha256.h index 9aa1251789a..6fbf542f671 100644 --- a/include/u-boot/sha256.h +++ b/include/u-boot/sha256.h @@ -22,4 +22,7 @@ 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); +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 c1fe93de012..70123c10608 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)); +} -- cgit v1.2.3