core/crypto: Exile keccak, md5 and sha1 to legacy

In an perfect world these would just be removed, but the world is
imperfect, and people are forced to interact/interface with things
that are broken.

vendor/botan/legacy/README.md

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+# crypto/legacy
+
+These are algorithms that are shipped solely for the purpose of
+interoperability with legacy systems.  The use of these packages in
+any other capacity is discouraged, especially those that are known
+to be broken.
+
+- keccak - The draft version of the algorithm that became SHA-3
+- MD5 - Broken (https://eprint.iacr.org/2005/075)
+- SHA-1 - Broken (https://eprint.iacr.org/2017/190)

vendor/botan/legacy/keccak/keccak.odin

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+package vendor_keccak
+
+/*
+    Copyright 2021 zhibog
+    Made available under the BSD-3 license.
+
+    List of contributors:
+        zhibog, dotbmp:  Initial implementation.
+
+    Interface for the Keccak hashing algorithm.
+    The hash will be computed via bindings to the Botan crypto library
+*/
+
+import "core:os"
+import "core:io"
+
+import botan "../../bindings"
+
+/*
+    High level API
+*/
+
+DIGEST_SIZE_512 :: 64
+
+// hash_string_512 will hash the given input and return the
+// computed hash
+hash_string_512 :: proc(data: string) -> [DIGEST_SIZE_512]byte {
+    return hash_bytes_512(transmute([]byte)(data))
+}
+
+// hash_bytes_512 will hash the given input and return the
+// computed hash
+hash_bytes_512 :: proc(data: []byte) -> [DIGEST_SIZE_512]byte {
+    hash: [DIGEST_SIZE_512]byte
+    ctx: Context
+    init(&ctx)
+    update(&ctx, data)
+    final(&ctx, hash[:])
+    return hash
+}
+
+// hash_string_to_buffer_512 will hash the given input and assign the
+// computed hash to the second parameter.
+// It requires that the destination buffer is at least as big as the digest size
+hash_string_to_buffer_512 :: proc(data: string, hash: []byte) {
+    hash_bytes_to_buffer_512(transmute([]byte)(data), hash)
+}
+
+// hash_bytes_to_buffer_512 will hash the given input and write the
+// computed hash into the second parameter.
+// It requires that the destination buffer is at least as big as the digest size
+hash_bytes_to_buffer_512 :: proc(data, hash: []byte) {
+    assert(len(hash) >= DIGEST_SIZE_512, "Size of destination buffer is smaller than the digest size")
+    ctx: Context
+    init(&ctx)
+    update(&ctx, data)
+    final(&ctx, hash[:])
+}
+
+// hash_stream_512 will read the stream in chunks and compute a
+// hash from its contents
+hash_stream_512 :: proc(s: io.Stream) -> ([DIGEST_SIZE_512]byte, bool) {
+    hash: [DIGEST_SIZE_512]byte
+    ctx: Context
+    init(&ctx)
+    buf := make([]byte, 512)
+    defer delete(buf)
+    i := 1
+    for i > 0 {
+        i, _ = io.read(s, buf)
+        if i > 0 {
+            update(&ctx, buf[:i])
+        }
+    }
+    final(&ctx, hash[:])
+    return hash, true
+}
+
+// hash_file_512 will read the file provided by the given handle
+// and compute a hash
+hash_file_512 :: proc(hd: os.Handle, load_at_once := false) -> ([DIGEST_SIZE_512]byte, bool) {
+    if !load_at_once {
+        return hash_stream_512(os.stream_from_handle(hd))
+    } else {
+        if buf, ok := os.read_entire_file(hd); ok {
+            return hash_bytes_512(buf[:]), ok
+        }
+    }
+    return [DIGEST_SIZE_512]byte{}, false
+}
+
+hash_512 :: proc {
+    hash_stream_512,
+    hash_file_512,
+    hash_bytes_512,
+    hash_string_512,
+    hash_bytes_to_buffer_512,
+    hash_string_to_buffer_512,
+}
+
+/*
+    Low level API
+*/
+
+Context :: botan.hash_t
+
+init :: proc "contextless" (ctx: ^Context) {
+    botan.hash_init(ctx, botan.HASH_KECCAK_512, 0)
+}
+
+update :: proc "contextless" (ctx: ^Context, data: []byte) {
+    botan.hash_update(ctx^, len(data) == 0 ? nil : &data[0], uint(len(data)))
+}
+
+final :: proc "contextless" (ctx: ^Context, hash: []byte) {
+    botan.hash_final(ctx^, &hash[0])
+    botan.hash_destroy(ctx^)
+}

vendor/botan/legacy/md5/md5.odin

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+package vendor_md5
+
+/*
+    Copyright 2021 zhibog
+    Made available under the BSD-3 license.
+
+    List of contributors:
+        zhibog:  Initial implementation.
+
+    Interface for the MD5 hashing algorithm.
+    The hash will be computed via bindings to the Botan crypto library
+*/
+
+import "core:os"
+import "core:io"
+
+import botan "../../bindings"
+
+/*
+    High level API
+*/
+
+DIGEST_SIZE :: 16
+
+// hash_string will hash the given input and return the
+// computed hash
+hash_string :: proc "contextless" (data: string) -> [DIGEST_SIZE]byte {
+    return hash_bytes(transmute([]byte)(data))
+}
+
+// hash_bytes will hash the given input and return the
+// computed hash
+hash_bytes :: proc "contextless" (data: []byte) -> [DIGEST_SIZE]byte {
+    hash: [DIGEST_SIZE]byte
+    ctx: Context
+    init(&ctx)
+    update(&ctx, data)
+    final(&ctx, hash[:])
+    return hash
+}
+
+// hash_string_to_buffer will hash the given input and assign the
+// computed hash to the second parameter.
+// It requires that the destination buffer is at least as big as the digest size
+hash_string_to_buffer :: proc(data: string, hash: []byte) {
+    hash_bytes_to_buffer(transmute([]byte)(data), hash)
+}
+
+// hash_bytes_to_buffer will hash the given input and write the
+// computed hash into the second parameter.
+// It requires that the destination buffer is at least as big as the digest size
+hash_bytes_to_buffer :: proc(data, hash: []byte) {
+    assert(len(hash) >= DIGEST_SIZE, "Size of destination buffer is smaller than the digest size")
+    ctx: Context
+    init(&ctx)
+    update(&ctx, data)
+    final(&ctx, hash[:])
+}
+
+// hash_stream will read the stream in chunks and compute a
+// hash from its contents
+hash_stream :: proc(s: io.Stream) -> ([DIGEST_SIZE]byte, bool) {
+    hash: [DIGEST_SIZE]byte
+    ctx: Context
+    init(&ctx)
+    buf := make([]byte, 512)
+    defer delete(buf)
+    i := 1
+    for i > 0 {
+        i, _ = io.read(s, buf)
+        if i > 0 {
+            update(&ctx, buf[:i])
+        }
+    }
+    final(&ctx, hash[:])
+    return hash, true
+}
+
+// hash_file will read the file provided by the given handle
+// and compute a hash
+hash_file :: proc(hd: os.Handle, load_at_once := false) -> ([DIGEST_SIZE]byte, bool) {
+    if !load_at_once {
+        return hash_stream(os.stream_from_handle(hd))
+    } else {
+        if buf, ok := os.read_entire_file(hd); ok {
+            return hash_bytes(buf[:]), ok
+        }
+    }
+    return [DIGEST_SIZE]byte{}, false
+}
+
+hash :: proc {
+    hash_stream,
+    hash_file,
+    hash_bytes,
+    hash_string,
+    hash_bytes_to_buffer,
+    hash_string_to_buffer,
+}
+
+/*
+    Low level API
+*/
+
+Context :: botan.hash_t
+
+init :: proc "contextless" (ctx: ^Context) {
+    botan.hash_init(ctx, botan.HASH_MD5, 0)
+}
+
+update :: proc "contextless" (ctx: ^Context, data: []byte) {
+    botan.hash_update(ctx^, len(data) == 0 ? nil : &data[0], uint(len(data)))
+}
+
+final :: proc "contextless" (ctx: ^Context, hash: []byte) {
+    botan.hash_final(ctx^, &hash[0])
+    botan.hash_destroy(ctx^)
+}

vendor/botan/legacy/sha1/sha1.odin

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+package vendor_sha1
+
+/*
+    Copyright 2021 zhibog
+    Made available under the BSD-3 license.
+
+    List of contributors:
+        zhibog:  Initial implementation.
+
+    Interface for the SHA-1 hashing algorithm.
+    The hash will be computed via bindings to the Botan crypto library
+*/
+
+import "core:os"
+import "core:io"
+
+import botan "../../bindings"
+
+/*
+    High level API
+*/
+
+DIGEST_SIZE :: 20
+
+// hash_string will hash the given input and return the
+// computed hash
+hash_string :: proc "contextless" (data: string) -> [DIGEST_SIZE]byte {
+    return hash_bytes(transmute([]byte)(data))
+}
+
+// hash_bytes will hash the given input and return the
+// computed hash
+hash_bytes :: proc "contextless" (data: []byte) -> [DIGEST_SIZE]byte {
+    hash: [DIGEST_SIZE]byte
+    ctx: Context
+    init(&ctx)
+    update(&ctx, data)
+    final(&ctx, hash[:])
+    return hash
+}
+
+// hash_string_to_buffer will hash the given input and assign the
+// computed hash to the second parameter.
+// It requires that the destination buffer is at least as big as the digest size
+hash_string_to_buffer :: proc(data: string, hash: []byte) {
+    hash_bytes_to_buffer(transmute([]byte)(data), hash)
+}
+
+// hash_bytes_to_buffer will hash the given input and write the
+// computed hash into the second parameter.
+// It requires that the destination buffer is at least as big as the digest size
+hash_bytes_to_buffer :: proc(data, hash: []byte) {
+    assert(len(hash) >= DIGEST_SIZE, "Size of destination buffer is smaller than the digest size")
+    ctx: Context
+    init(&ctx)
+    update(&ctx, data)
+    final(&ctx, hash[:])
+}
+
+// hash_stream will read the stream in chunks and compute a
+// hash from its contents
+hash_stream :: proc(s: io.Stream) -> ([DIGEST_SIZE]byte, bool) {
+    hash: [DIGEST_SIZE]byte
+    ctx: Context
+    init(&ctx)
+    buf := make([]byte, 512)
+    defer delete(buf)
+    i := 1
+    for i > 0 {
+        i, _ = io.read(s, buf)
+        if i > 0 {
+            update(&ctx, buf[:i])
+        }
+    }
+    final(&ctx, hash[:])
+    return hash, true
+}
+
+// hash_file will read the file provided by the given handle
+// and compute a hash
+hash_file :: proc(hd: os.Handle, load_at_once := false) -> ([DIGEST_SIZE]byte, bool) {
+    if !load_at_once {
+        return hash_stream(os.stream_from_handle(hd))
+    } else {
+        if buf, ok := os.read_entire_file(hd); ok {
+            return hash_bytes(buf[:]), ok
+        }
+    }
+    return [DIGEST_SIZE]byte{}, false
+}
+
+hash :: proc {
+    hash_stream,
+    hash_file,
+    hash_bytes,
+    hash_string,
+    hash_bytes_to_buffer,
+    hash_string_to_buffer,
+}
+
+/*
+    Low level API
+*/
+
+Context :: botan.hash_t
+
+init :: proc "contextless" (ctx: ^Context) {
+    botan.hash_init(ctx, botan.HASH_SHA1, 0)
+}
+
+update :: proc "contextless" (ctx: ^Context, data: []byte) {
+    botan.hash_update(ctx^, len(data) == 0 ? nil : &data[0], uint(len(data)))
+}
+
+final :: proc "contextless" (ctx: ^Context, hash: []byte) {
+    botan.hash_final(ctx^, &hash[0])
+    botan.hash_destroy(ctx^)
+}