MD5

Compute the MD5 hash of a binary blob as fast as possible. 3 CPU cores are available.

Input: 250 000 000 bytes on STDIN.

Output: The MD5 digest as a lowercase hexadecimal string (32 characters).

Restrictions:30s512Mb 3 Score Packages

Feel free to create an issue if you need an extra library from the standard Ubuntu repository.

Name	Version	Description
libc6-dev	2.39-0ubuntu8.7	GNU C Library: Development Libraries and Header Files Contains the symlinks, headers, and object files needed to compile and link programs which use the standard C library.
libclang-common-14-dev	1:14.0.6-19build4	Clang library - Common development package Clang project is a C, C++, Objective C and Objective C++ front-end based on the LLVM compiler. Its goal is to offer a replacement to the GNU Compiler Collection (GCC). . Clang implements all of the ISO C++ 1998, 11, 14 and 17 standards and also provides most of the support of C++20. . This package contains the Clang generic headers.
libclang-common-15-dev	1:15.0.7-14build3	Clang library - Common development package Clang project is a C, C++, Objective C and Objective C++ front-end based on the LLVM compiler. Its goal is to offer a replacement to the GNU Compiler Collection (GCC). . Clang implements all of the ISO C++ 1998, 11, 14 and 17 standards and also provides most of the support of C++20. . This package contains the Clang generic headers.
libclang-common-16-dev	1:16.0.6-23ubuntu4	Clang library - Common development package Clang project is a C, C++, Objective C and Objective C++ front-end based on the LLVM compiler. Its goal is to offer a replacement to the GNU Compiler Collection (GCC). . Clang implements all of the ISO C++ 1998, 11, 14 and 17 standards and also provides most of the support of C++20. . This package contains the Clang generic headers.
libclang-common-17-dev	1:17.0.6-9ubuntu1	Clang library - Common development package Clang project is a C, C++, Objective C and Objective C++ front-end based on the LLVM compiler. Its goal is to offer a replacement to the GNU Compiler Collection (GCC). . Clang implements all of the ISO C++ 1998, 11, 14 and 17 standards and also provides most of the support of C++20. . This package contains the Clang generic headers.
libclang-common-18-dev	1:18.1.3-1ubuntu1	Clang library - Common development package Clang project is a C, C++, Objective C and Objective C++ front-end based on the LLVM compiler. Its goal is to offer a replacement to the GNU Compiler Collection (GCC). . Clang implements all of the ISO C++ 1998, 11, 14 and 17 standards and also provides most of the support of C++20. . This package contains the Clang generic headers.
libclang-common-19-dev	1:19.1.1-1ubuntu1~24.04.2	Clang library - Common development package Clang project is a C, C++, Objective C and Objective C++ front-end based on the LLVM compiler. Its goal is to offer a replacement to the GNU Compiler Collection (GCC). . Clang implements all of the ISO C++ 1998, 11, 14 and 17 standards and also provides most of the support of C++20. . This package contains the Clang generic headers.
libclang-common-20-dev	1:20.1.2-0ubuntu1~24.04.2	Clang library - Common development package Clang project is a C, C++, Objective C and Objective C++ front-end based on the LLVM compiler. Its goal is to offer a replacement to the GNU Compiler Collection (GCC). . Clang implements all of the ISO C++ 1998, 11, 14 and 17 standards and also provides most of the support of C++20. . This package contains the Clang generic headers.
libcrypt-dev	1:4.4.36-4build1	libcrypt development files This package contains the files needed for developing applications that use libcrypt.
libgcc-10-dev	10.5.0-4ubuntu2.1	GCC support library (development files) This package contains the headers and static library files necessary for building C programs which use libgcc, libgomp, libquadmath, libssp or libitm.
libgcc-11-dev	11.5.0-1ubuntu1~24.04.1	GCC support library (development files) This package contains the headers and static library files necessary for building C programs which use libgcc, libgomp, libquadmath, libssp or libitm.
libgcc-12-dev	12.4.0-2ubuntu1~24.04.1	GCC support library (development files) This package contains the headers and static library files necessary for building C programs which use libgcc, libgomp, libquadmath, libssp or libitm.
libgcc-13-dev	13.3.0-6ubuntu2~24.04.1	GCC support library (development files) This package contains the headers and static library files necessary for building C programs which use libgcc, libgomp, libquadmath, libssp or libitm.
libgcc-14-dev	14.2.0-4ubuntu2~24.04.1	GCC support library (development files) This package contains the headers and static library files necessary for building C programs which use libgcc, libgomp, libquadmath, libssp or libitm.
libobjc-13-dev	13.3.0-6ubuntu2~24.04.1	Runtime library for GNU Objective-C applications (development files) This package contains the headers and static library files needed to build GNU ObjC applications.
libssl-dev	3.0.13-0ubuntu3.9	Secure Sockets Layer toolkit - development files This package is part of the OpenSSL project's implementation of the SSL and TLS cryptographic protocols for secure communication over the Internet. . It contains development libraries, header files, and manpages for libssl and libcrypto.
libstdc++-10-dev	10.5.0-4ubuntu2.1	GNU Standard C++ Library v3 (development files) This package contains the headers and static library files necessary for building C++ programs which use libstdc++. . libstdc++-v3 is a complete rewrite from the previous libstdc++-v2, which was included up to g++-2.95. The first version of libstdc++-v3 appeared in g++-3.0.
libstdc++-11-dev	11.5.0-1ubuntu1~24.04.1	GNU Standard C++ Library v3 (development files) This package contains the headers and static library files necessary for building C++ programs which use libstdc++. . libstdc++-v3 is a complete rewrite from the previous libstdc++-v2, which was included up to g++-2.95. The first version of libstdc++-v3 appeared in g++-3.0.
libstdc++-12-dev	12.4.0-2ubuntu1~24.04.1	GNU Standard C++ Library v3 (development files) This package contains the headers and static library files necessary for building C++ programs which use libstdc++. . libstdc++-v3 is a complete rewrite from the previous libstdc++-v2, which was included up to g++-2.95. The first version of libstdc++-v3 appeared in g++-3.0.
libstdc++-13-dev	13.3.0-6ubuntu2~24.04.1	GNU Standard C++ Library v3 (development files) This package contains the headers and static library files necessary for building C++ programs which use libstdc++. . libstdc++-v3 is a complete rewrite from the previous libstdc++-v2, which was included up to g++-2.95. The first version of libstdc++-v3 appeared in g++-3.0.
libstdc++-14-dev	14.2.0-4ubuntu2~24.04.1	GNU Standard C++ Library v3 (development files) This package contains the headers and static library files necessary for building C++ programs which use libstdc++. . libstdc++-v3 is a complete rewrite from the previous libstdc++-v2, which was included up to g++-2.95. The first version of libstdc++-v3 appeared in g++-3.0.
libtbb-dev	2021.11.0-2ubuntu2	parallelism library for C++ - development files TBB is a library that helps you leverage multi-core processor performance without having to be a threading expert. It represents a higher-level, task-based parallelism that abstracts platform details and threading mechanism for performance and scalability. . (Note: if you are a user of the i386 architecture, i.e., 32-bit Intel or compatible hardware, this package only supports Pentium4-compatible and higher processors.) . This package includes the TBB development files.

{"main.cpp":"#include \u003ccstdio\u003e\n#include \u003ccstdint\u003e\n#include \u003ccstring\u003e\n#include \u003ccassert\u003e\n\nstatic inline uint32_t F(uint32_t x, uint32_t y, uint32_t z) { return (x \u0026 y) | (~x \u0026 z); }\nstatic inline uint32_t G(uint32_t x, uint32_t y, uint32_t z) { return (x \u0026 z) | (y \u0026 ~z); }\nstatic inline uint32_t H(uint32_t x, uint32_t y, uint32_t z) { return x ^ y ^ z; }\nstatic inline uint32_t I(uint32_t x, uint32_t y, uint32_t z) { return y ^ (x | ~z); }\nstatic inline uint32_t rotl(uint32_t x, int n) { return (x \u003c\u003c n) | (x \u003e\u003e (32 - n)); }\n\nstatic const uint32_t T[64] = {\n    0xd76aa478,0xe8c7b756,0x242070db,0xc1bdceee,0xf57c0faf,0x4787c62a,0xa8304613,0xfd469501,\n    0x698098d8,0x8b44f7af,0xffff5bb1,0x895cd7be,0x6b901122,0xfd987193,0xa679438e,0x49b40821,\n    0xf61e2562,0xc040b340,0x265e5a51,0xe9b6c7aa,0xd62f105d,0x02441453,0xd8a1e681,0xe7d3fbc8,\n    0x21e1cde6,0xc33707d6,0xf4d50d87,0x455a14ed,0xa9e3e905,0xfcefa3f8,0x676f02d9,0x8d2a4c8a,\n    0xfffa3942,0x8771f681,0x6d9d6122,0xfde5380c,0xa4beea44,0x4bdecfa9,0xf6bb4b60,0xbebfbc70,\n    0x289b7ec6,0xeaa127fa,0xd4ef3085,0x04881d05,0xd9d4d039,0xe6db99e5,0x1fa27cf8,0xc4ac5665,\n    0xf4292244,0x432aff97,0xab9423a7,0xfc93a039,0x655b59c3,0x8f0ccc92,0xffeff47d,0x85845dd1,\n    0x6fa87e4f,0xfe2ce6e0,0xa3014314,0x4e0811a1,0xf7537e82,0xbd3af235,0x2ad7d2bb,0xeb86d391,\n};\nstatic const int S[64] = {\n    7,12,17,22,7,12,17,22,7,12,17,22,7,12,17,22,\n    5,9,14,20,5,9,14,20,5,9,14,20,5,9,14,20,\n    4,11,16,23,4,11,16,23,4,11,16,23,4,11,16,23,\n    6,10,15,21,6,10,15,21,6,10,15,21,6,10,15,21,\n};\n\nstruct MD5 {\n    uint32_t state[4] = {0x67452301, 0xefcdab89, 0x98badcfe, 0x10325476};\n    uint64_t count = 0;\n    uint8_t buffer[64];\n    int buflen = 0;\n\n    void transform(const uint8_t block[64]) {\n        uint32_t M[16];\n        for (int i = 0; i \u003c 16; i++)\n            memcpy(\u0026M[i], block + i * 4, 4);\n\n        uint32_t a = state[0], b = state[1], c = state[2], d = state[3];\n\n        for (int i = 0; i \u003c 64; i++) {\n            uint32_t f, g;\n            if (i \u003c 16)      { f = F(b,c,d); g = i; }\n            else if (i \u003c 32) { f = G(b,c,d); g = (5*i+1) % 16; }\n            else if (i \u003c 48) { f = H(b,c,d); g = (3*i+5) % 16; }\n            else              { f = I(b,c,d); g = (7*i) % 16; }\n            uint32_t tmp = d;\n            d = c; c = b;\n            b = b + rotl(a + f + T[i] + M[g], S[i]);\n            a = tmp;\n        }\n        state[0] += a; state[1] += b; state[2] += c; state[3] += d;\n    }\n\n    void update(const uint8_t* data, size_t len) {\n        count += len;\n        while (len \u003e 0) {\n            int space = 64 - buflen;\n            int take = (int)len \u003c space ? (int)len : space;\n            memcpy(buffer + buflen, data, take);\n            buflen += take;\n            data += take;\n            len -= take;\n            if (buflen == 64) {\n                transform(buffer);\n                buflen = 0;\n            }\n        }\n    }\n\n    void finish(uint8_t digest[16]) {\n        uint64_t bits = count * 8;\n        uint8_t b = 0x80;\n        update(\u0026b, 1);\n        b = 0;\n        while (buflen != 56)\n            update(\u0026b, 1);\n        uint8_t bitsle[8];\n        memcpy(bitsle, \u0026bits, 8);\n        update(bitsle, 8);\n        memcpy(digest, state, 16);\n    }\n};\n\nint main() {\n    const size_t totalBytes = 250000000;\n    const size_t bufSize = 1 \u003c\u003c 20;\n\n    static unsigned char buf[1 \u003c\u003c 20];\n    MD5 md5;\n\n    size_t totalRead = 0;\n    while (totalRead \u003c totalBytes) {\n        size_t toRead = bufSize;\n        if (totalRead + toRead \u003e totalBytes) toRead = totalBytes - totalRead;\n        size_t n = fread(buf, 1, toRead, stdin);\n        if (n == 0) return 1;\n        md5.update(buf, n);\n        totalRead += n;\n    }\n    assert(totalRead == totalBytes);\n    unsigned char tail;\n    assert(fread(\u0026tail, 1, 1, stdin) == 0 \u0026\u0026 feof(stdin));\n\n    unsigned char digest[16];\n    md5.finish(digest);\n\n    for (int i = 0; i \u003c 16; i++)\n        printf(\"%02x\", digest[i]);\n\n    return 0;\n}\n"}

Model	Intel(R) Xeon(R) CPU E3-1271 v3 @ 3.60GHz
Cores	3