diff --git a/build/bazel/remote/execution/v2/remote_execution.pb.go b/build/bazel/remote/execution/v2/remote_execution.pb.go index 3ec3f206..c7b052ee 100755 --- a/build/bazel/remote/execution/v2/remote_execution.pb.go +++ b/build/bazel/remote/execution/v2/remote_execution.pb.go @@ -133,6 +133,62 @@ const ( // cryptographic hash function and its collision properties are not strongly guaranteed. // See https://github.com/aappleby/smhasher/wiki/MurmurHash3 . DigestFunction_MURMUR3 DigestFunction_Value = 7 + // The SHA-256 digest function, modified to use a Merkle tree for + // large objects. SHA256TREE hashes are computed as follows: + // + // - For blobs that are 1024 bytes or smaller, the hash is computed + // using the regular SHA-256 digest function. + // + // - For blobs that are more than 1024 bytes in size, the hash is + // computed as follows: + // + // 1. The blob is partitioned into a left (leading) and right + // (trailing) blob. These blobs have lengths m and n + // respectively, where m = 2^k and 0 < n <= m. + // + // 2. Hashes of the left and right blob, Hash(left) and + // Hash(right) respectively, are computed by recursively + // applying the SHA256TREE algorithm. + // + // 3. A single invocation is made to the SHA-256 block cipher with + // the following parameters: + // + // M = Hash(left) || Hash(right) + // H = { + // 0xcbbb9d5d, 0x629a292a, 0x9159015a, 0x152fecd8, + // 0x67332667, 0x8eb44a87, 0xdb0c2e0d, 0x47b5481d, + // } + // + // The values of H are the leading fractional parts of the 9th + // to the 16th prime number (23 to 53). This differs from plain + // SHA-256, where first eight prime numbers (2 to 19) are used, + // thereby preventing trivial hash collisions between small and + // large objects. + // + // 4. The hash of the full blob can then be obtained by + // concatenating the outputs of the block cipher: + // + // Hash(blob) = a || b || c || d || e || f || g || h + // + // Addition of the original values of H, as normally done + // through the use of the Davies-Meyer structure, is not + // performed. This isn't necessary, as the block cipher is only + // invoked once. + // + // This modification to the SHA-256 digest function permits + // implementations to store large blobs as a decomposed sequence of + // 2^k sized chunks, where k >= 10, while being able to validate + // integrity at the chunk level. + // + // Furthermore, on systems that do not offer dedicated instructions + // for computing SHA-256 hashes (e.g., using the Intel SHA and ARMv8 + // cryptographic extensions), SHA256TREE hashes can be computed more + // efficiently than plain SHA-256 hashes by using generic SIMD + // extensions, such as Intel AVX2 or ARM NEON. + // + // Test vectors of this digest function can be found in the + // accompanying sha256tree_test_vectors.txt file. + DigestFunction_SHA256TREE DigestFunction_Value = 8 ) // Enum value maps for DigestFunction_Value. @@ -146,16 +202,18 @@ var ( 5: "SHA384", 6: "SHA512", 7: "MURMUR3", + 8: "SHA256TREE", } DigestFunction_Value_value = map[string]int32{ - "UNKNOWN": 0, - "SHA256": 1, - "SHA1": 2, - "MD5": 3, - "VSO": 4, - "SHA384": 5, - "SHA512": 6, - "MURMUR3": 7, + "UNKNOWN": 0, + "SHA256": 1, + "SHA1": 2, + "MD5": 3, + "VSO": 4, + "SHA384": 5, + "SHA512": 6, + "MURMUR3": 7, + "SHA256TREE": 8, } ) @@ -1283,6 +1341,13 @@ type Digest struct { // The hash. In the case of SHA-256, it will always be a lowercase hex string // exactly 64 characters long. + // + // For any digest function having enumeration value 8 or higher, the hash MUST + // be prefixed with the shortest decimal representation of the enumeration + // value, followed by a hyphen. For example, for SHA256TREE, a hash may be + // "8-bb1d2c5731351d75e147129060313a04c9cb59edb7ffda0873470f891198cf2b". This + // prevents ambiguities between digest functions generating hashes of equal + // length. Hash string `protobuf:"bytes,1,opt,name=hash,proto3" json:"hash,omitempty"` // The size of the blob, in bytes. SizeBytes int64 `protobuf:"varint,2,opt,name=size_bytes,json=sizeBytes,proto3" json:"size_bytes,omitempty"` @@ -5098,263 +5163,264 @@ var file_build_bazel_remote_execution_v2_remote_execution_proto_rawDesc = []byte 0x6f, 0x6e, 0x18, 0x05, 0x20, 0x01, 0x28, 0x0b, 0x32, 0x1a, 0x2e, 0x62, 0x75, 0x69, 0x6c, 0x64, 0x2e, 0x62, 0x61, 0x7a, 0x65, 0x6c, 0x2e, 0x73, 0x65, 0x6d, 0x76, 0x65, 0x72, 0x2e, 0x53, 0x65, 0x6d, 0x56, 0x65, 0x72, 0x52, 0x0e, 0x68, 0x69, 0x67, 0x68, 0x41, 0x70, 0x69, 0x56, 0x65, 0x72, - 0x73, 0x69, 0x6f, 0x6e, 0x22, 0x73, 0x0a, 0x0e, 0x44, 0x69, 0x67, 0x65, 0x73, 0x74, 0x46, 0x75, - 0x6e, 0x63, 0x74, 0x69, 0x6f, 0x6e, 0x22, 0x61, 0x0a, 0x05, 0x56, 0x61, 0x6c, 0x75, 0x65, 0x12, - 0x0b, 0x0a, 0x07, 0x55, 0x4e, 0x4b, 0x4e, 0x4f, 0x57, 0x4e, 0x10, 0x00, 0x12, 0x0a, 0x0a, 0x06, - 0x53, 0x48, 0x41, 0x32, 0x35, 0x36, 0x10, 0x01, 0x12, 0x08, 0x0a, 0x04, 0x53, 0x48, 0x41, 0x31, - 0x10, 0x02, 0x12, 0x07, 0x0a, 0x03, 0x4d, 0x44, 0x35, 0x10, 0x03, 0x12, 0x07, 0x0a, 0x03, 0x56, - 0x53, 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In the case of SHA-256, it will always be a lowercase hex string // exactly 64 characters long. + // + // For any digest function having enumeration value 8 or higher, the hash MUST + // be prefixed with the shortest decimal representation of the enumeration + // value, followed by a hyphen. For example, for SHA256TREE, a hash may be + // "8-bb1d2c5731351d75e147129060313a04c9cb59edb7ffda0873470f891198cf2b". This + // prevents ambiguities between digest functions generating hashes of equal + // length. string hash = 1; // The size of the blob, in bytes. @@ -1743,6 +1750,63 @@ message DigestFunction { // cryptographic hash function and its collision properties are not strongly guaranteed. // See https://github.com/aappleby/smhasher/wiki/MurmurHash3 . MURMUR3 = 7; + + // The SHA-256 digest function, modified to use a Merkle tree for + // large objects. SHA256TREE hashes are computed as follows: + // + // - For blobs that are 1024 bytes or smaller, the hash is computed + // using the regular SHA-256 digest function. + // + // - For blobs that are more than 1024 bytes in size, the hash is + // computed as follows: + // + // 1. The blob is partitioned into a left (leading) and right + // (trailing) blob. These blobs have lengths m and n + // respectively, where m = 2^k and 0 < n <= m. + // + // 2. Hashes of the left and right blob, Hash(left) and + // Hash(right) respectively, are computed by recursively + // applying the SHA256TREE algorithm. + // + // 3. A single invocation is made to the SHA-256 block cipher with + // the following parameters: + // + // M = Hash(left) || Hash(right) + // H = { + // 0xcbbb9d5d, 0x629a292a, 0x9159015a, 0x152fecd8, + // 0x67332667, 0x8eb44a87, 0xdb0c2e0d, 0x47b5481d, + // } + // + // The values of H are the leading fractional parts of the 9th + // to the 16th prime number (23 to 53). This differs from plain + // SHA-256, where first eight prime numbers (2 to 19) are used, + // thereby preventing trivial hash collisions between small and + // large objects. + // + // 4. The hash of the full blob can then be obtained by + // concatenating the outputs of the block cipher: + // + // Hash(blob) = a || b || c || d || e || f || g || h + // + // Addition of the original values of H, as normally done + // through the use of the Davies-Meyer structure, is not + // performed. This isn't necessary, as the block cipher is only + // invoked once. + // + // This modification to the SHA-256 digest function permits + // implementations to store large blobs as a decomposed sequence of + // 2^k sized chunks, where k >= 10, while being able to validate + // integrity at the chunk level. + // + // Furthermore, on systems that do not offer dedicated instructions + // for computing SHA-256 hashes (e.g., using the Intel SHA and ARMv8 + // cryptographic extensions), SHA256TREE hashes can be computed more + // efficiently than plain SHA-256 hashes by using generic SIMD + // extensions, such as Intel AVX2 or ARM NEON. + // + // Test vectors of this digest function can be found in the + // accompanying sha256tree_test_vectors.txt file. + SHA256TREE = 8; } } diff --git a/build/bazel/remote/execution/v2/sha256tree_test_vectors.txt b/build/bazel/remote/execution/v2/sha256tree_test_vectors.txt new file mode 100644 index 00000000..d0483179 --- /dev/null +++ b/build/bazel/remote/execution/v2/sha256tree_test_vectors.txt @@ -0,0 +1,27 @@ +# Test vectors for the SHA256TREE digest function +# +# Each test vector corresponds to the hash of a repeating sequence of +# 251 bytes: 0, 1, 2, ..., 249, 250, 0, 1, ..., and so on. The number in +# the first column corresponds to the length of the sequence, in bytes. +# +# Test vectors for input lengths 1024 and less are not provided, as +# those are identical to those of plain SHA-256. + +1025 36c0998b21839ef74300b9de47d96d1f62323dc81f2b4231e98ce70cd6ffe750 +2048 b584996386f01793751c5cf0c39561f51b7e9924b818943b3cb2f6928cea0fa9 +2049 7318d2029b0392edf4cf109edb5a086b4bdadbb7950f710a1483eb881d9e5d44 +3072 dfc61c0a041f79d55d53bfe31c6cda7df77fdc8e6fbac1143d70b7144fdf6937 +3073 517d20c0e5835f060a1bd6388ed68574f63424bdac2a2c3a35a5c2ef859d8fe2 +4096 2f72bb93880012168c027f6781527ff08177c7c8dccb443f4d2c6389c186633d +4097 c3ec942c1b8f4580320d3a06bcf4f8fe1f5db2be797ab67061ea4c2a95f208f2 +5120 a76924f6535b4b473377c285ec27acc84cc58e95ab1e9e29b1bb6a4a3fb9d0b3 +5121 98f987c3e9fc057a70873715b679b89a663d0df806859b6ce73f8379b06a10ff +6144 372f988af412041b680ab236feef45626380062beb7514bbf93607aedd28fc9a +6145 6dc4b78efd770453417b2ffdc74b27054793efe6122ecd7ee098670ed7c4651c +7168 43686312c0cabccf9d5ad509efa096e3d743c63c7a51f122473c57949e4dd9a0 +7169 ad729297ab36cd099665b27c4247474a5518e4cd0be443f5f31d95edda08429b +8192 fcfdde6fe59178e17708c5ba647919c3b141a44c9d1970782e597e1465266932 +8193 113c6e3a2452f388b6fad13dfab66ee0bff597a0a9a517ad8d0165f7190b603e +16384 a7a10149a8cb00be537000560edb83b196306b780b72fad8af218f369f75fc19 +31744 2cdf7662636c173d4b236f6ea03bf84c65e7f6487b53b2a61c420e26cf8a98c7 +102400 0668d69e5331840d2f1823d717b7b3f5d1fdc8a09504cddb692b87ff83d50e5f