diff options
Diffstat (limited to 'src/crypto/sha256.c')
-rw-r--r-- | src/crypto/sha256.c | 49 |
1 files changed, 36 insertions, 13 deletions
diff --git a/src/crypto/sha256.c b/src/crypto/sha256.c index 3a560560..695ae70c 100644 --- a/src/crypto/sha256.c +++ b/src/crypto/sha256.c @@ -69,6 +69,37 @@ static const uint32_t k[64] = { 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2 }; +/** SHA-256 initial digest values */ +static const struct sha256_digest sha256_init_digest = { + .h = { + cpu_to_be32 ( 0x6a09e667 ), + cpu_to_be32 ( 0xbb67ae85 ), + cpu_to_be32 ( 0x3c6ef372 ), + cpu_to_be32 ( 0xa54ff53a ), + cpu_to_be32 ( 0x510e527f ), + cpu_to_be32 ( 0x9b05688c ), + cpu_to_be32 ( 0x1f83d9ab ), + cpu_to_be32 ( 0x5be0cd19 ), + }, +}; + +/** + * Initialise SHA-256 family algorithm + * + * @v context SHA-256 context + * @v init Initial digest values + * @v digestsize Digest size + */ +void sha256_family_init ( struct sha256_context *context, + const struct sha256_digest *init, + size_t digestsize ) { + + context->len = 0; + context->digestsize = digestsize; + memcpy ( &context->ddd.dd.digest, init, + sizeof ( context->ddd.dd.digest ) ); +} + /** * Initialise SHA-256 algorithm * @@ -77,15 +108,8 @@ static const uint32_t k[64] = { static void sha256_init ( void *ctx ) { struct sha256_context *context = ctx; - context->ddd.dd.digest.h[0] = cpu_to_be32 ( 0x6a09e667 ); - context->ddd.dd.digest.h[1] = cpu_to_be32 ( 0xbb67ae85 ); - context->ddd.dd.digest.h[2] = cpu_to_be32 ( 0x3c6ef372 ); - context->ddd.dd.digest.h[3] = cpu_to_be32 ( 0xa54ff53a ); - context->ddd.dd.digest.h[4] = cpu_to_be32 ( 0x510e527f ); - context->ddd.dd.digest.h[5] = cpu_to_be32 ( 0x9b05688c ); - context->ddd.dd.digest.h[6] = cpu_to_be32 ( 0x1f83d9ab ); - context->ddd.dd.digest.h[7] = cpu_to_be32 ( 0x5be0cd19 ); - context->len = 0; + sha256_family_init ( context, &sha256_init_digest, + sizeof ( struct sha256_digest ) ); } /** @@ -190,7 +214,7 @@ static void sha256_digest ( struct sha256_context *context ) { * @v data Data * @v len Length of data */ -static void sha256_update ( void *ctx, const void *data, size_t len ) { +void sha256_update ( void *ctx, const void *data, size_t len ) { struct sha256_context *context = ctx; const uint8_t *byte = data; size_t offset; @@ -213,7 +237,7 @@ static void sha256_update ( void *ctx, const void *data, size_t len ) { * @v ctx SHA-256 context * @v out Output buffer */ -static void sha256_final ( void *ctx, void *out ) { +void sha256_final ( void *ctx, void *out ) { struct sha256_context *context = ctx; uint64_t len_bits; uint8_t pad; @@ -234,8 +258,7 @@ static void sha256_final ( void *ctx, void *out ) { assert ( ( context->len % sizeof ( context->ddd.dd.data ) ) == 0 ); /* Copy out final digest */ - memcpy ( out, &context->ddd.dd.digest, - sizeof ( context->ddd.dd.digest ) ); + memcpy ( out, &context->ddd.dd.digest, context->digestsize ); } /** SHA-256 algorithm */ |