diff options
Diffstat (limited to 'qemu/roms/ipxe/src/crypto/sha256.c')
| -rw-r--r-- | qemu/roms/ipxe/src/crypto/sha256.c | 63 |
1 files changed, 45 insertions, 18 deletions
diff --git a/qemu/roms/ipxe/src/crypto/sha256.c b/qemu/roms/ipxe/src/crypto/sha256.c index 36e02b3c2..0360d8d16 100644 --- a/qemu/roms/ipxe/src/crypto/sha256.c +++ b/qemu/roms/ipxe/src/crypto/sha256.c @@ -15,9 +15,13 @@ * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA * 02110-1301, USA. + * + * You can also choose to distribute this program under the terms of + * the Unmodified Binary Distribution Licence (as given in the file + * COPYING.UBDL), provided that you have satisfied its requirements. */ -FILE_LICENCE ( GPL2_OR_LATER ); +FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); /** @file * @@ -47,11 +51,11 @@ struct sha256_variables { uint32_t f; uint32_t g; uint32_t h; - uint32_t w[64]; + uint32_t w[SHA256_ROUNDS]; } __attribute__ (( packed )); /** SHA-256 constants */ -static const uint32_t k[64] = { +static const uint32_t k[SHA256_ROUNDS] = { 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, 0xe49b69c1, 0xefbe4786, @@ -65,6 +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 * @@ -73,15 +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 ) ); } /** @@ -139,7 +167,7 @@ static void sha256_digest ( struct sha256_context *context ) { } /* Initialise w[16..63] */ - for ( i = 16 ; i < 64 ; i++ ) { + for ( i = 16 ; i < SHA256_ROUNDS ; i++ ) { s0 = ( ror32 ( w[i-15], 7 ) ^ ror32 ( w[i-15], 18 ) ^ ( w[i-15] >> 3 ) ); s1 = ( ror32 ( w[i-2], 17 ) ^ ror32 ( w[i-2], 19 ) ^ @@ -148,7 +176,7 @@ static void sha256_digest ( struct sha256_context *context ) { } /* Main loop */ - for ( i = 0 ; i < 64 ; i++ ) { + for ( i = 0 ; i < SHA256_ROUNDS ; i++ ) { s0 = ( ror32 ( *a, 2 ) ^ ror32 ( *a, 13 ) ^ ror32 ( *a, 22 ) ); maj = ( ( *a & *b ) ^ ( *a & *c ) ^ ( *b & *c ) ); t2 = ( s0 + maj ); @@ -186,7 +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; @@ -209,7 +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; @@ -230,8 +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 */ |