Add Botan crypto lib as a vendor library

vendor/botan/tiger/tiger.odin

@@ -0,0 +1,218 @@
+package tiger
+
+/*
+    Copyright 2021 zhibog
+    Made available under the BSD-3 license.
+
+    List of contributors:
+        zhibog:  Initial implementation.
+
+    Interface for the Tiger 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
+*/
+
+// hash_string_128 will hash the given input and return the
+// computed hash
+hash_string_128 :: proc(data: string) -> [16]byte {
+    return hash_bytes_128(transmute([]byte)(data))
+}
+
+// hash_bytes_128 will hash the given input and return the
+// computed hash
+hash_bytes_128 :: proc(data: []byte) -> [16]byte {
+    hash: [16]byte
+    ctx: botan.hash_t
+    botan.hash_init(&ctx, botan.HASH_TIGER_128, 0)
+    botan.hash_update(ctx, len(data) == 0 ? nil : &data[0], uint(len(data)))
+    botan.hash_final(ctx, &hash[0])
+    botan.hash_destroy(ctx)
+    return hash
+}
+
+// hash_stream_128 will read the stream in chunks and compute a
+// hash from its contents
+hash_stream_128 :: proc(s: io.Stream) -> ([16]byte, bool) {
+    hash: [16]byte
+    ctx: botan.hash_t
+    botan.hash_init(&ctx, botan.HASH_TIGER_128, 0)
+    buf := make([]byte, 512)
+    defer delete(buf)
+    i := 1
+    for i > 0 {
+        i, _ = s->impl_read(buf)
+        if i > 0 {
+            botan.hash_update(ctx, len(buf) == 0 ? nil : &buf[0], uint(i))
+        } 
+    }
+    botan.hash_final(ctx, &hash[0])
+    botan.hash_destroy(ctx)
+    return hash, true 
+}
+
+// hash_file_128 will read the file provided by the given handle
+// and compute a hash
+hash_file_128 :: proc(hd: os.Handle, load_at_once := false) -> ([16]byte, bool) {
+    if !load_at_once {
+        return hash_stream_128(os.stream_from_handle(hd))
+    } else {
+        if buf, ok := os.read_entire_file(hd); ok {
+            return hash_bytes_128(buf[:]), ok
+        }
+    }
+    return [16]byte{}, false
+}
+
+hash_128 :: proc {
+    hash_stream_128,
+    hash_file_128,
+    hash_bytes_128,
+    hash_string_128,
+}
+
+// hash_string_160 will hash the given input and return the
+// computed hash
+hash_string_160 :: proc(data: string) -> [20]byte {
+    return hash_bytes_160(transmute([]byte)(data))
+}
+
+// hash_bytes_160 will hash the given input and return the
+// computed hash
+hash_bytes_160 :: proc(data: []byte) -> [20]byte {
+    hash: [20]byte
+    ctx: botan.hash_t
+    botan.hash_init(&ctx, botan.HASH_TIGER_160, 0)
+    botan.hash_update(ctx, len(data) == 0 ? nil : &data[0], uint(len(data)))
+    botan.hash_final(ctx, &hash[0])
+    botan.hash_destroy(ctx)
+    return hash
+}
+
+// hash_stream_160 will read the stream in chunks and compute a
+// hash from its contents
+hash_stream_160 :: proc(s: io.Stream) -> ([20]byte, bool) {
+    hash: [20]byte
+    ctx: botan.hash_t
+    botan.hash_init(&ctx, botan.HASH_TIGER_160, 0)
+    buf := make([]byte, 512)
+    defer delete(buf)
+    i := 1
+    for i > 0 {
+        i, _ = s->impl_read(buf)
+        if i > 0 {
+            botan.hash_update(ctx, len(buf) == 0 ? nil : &buf[0], uint(i))
+        } 
+    }
+    botan.hash_final(ctx, &hash[0])
+    botan.hash_destroy(ctx)
+    return hash, true 
+}
+
+// hash_file_160 will read the file provided by the given handle
+// and compute a hash
+hash_file_160 :: proc(hd: os.Handle, load_at_once := false) -> ([20]byte, bool) {
+    if !load_at_once {
+        return hash_stream_160(os.stream_from_handle(hd))
+    } else {
+        if buf, ok := os.read_entire_file(hd); ok {
+            return hash_bytes_160(buf[:]), ok
+        }
+    }
+    return [20]byte{}, false
+}
+
+hash_160 :: proc {
+    hash_stream_160,
+    hash_file_160,
+    hash_bytes_160,
+    hash_string_160,
+}
+
+// hash_string_192 will hash the given input and return the
+// computed hash
+hash_string_192 :: proc(data: string) -> [24]byte {
+    return hash_bytes_192(transmute([]byte)(data))
+}
+
+// hash_bytes_192 will hash the given input and return the
+// computed hash
+hash_bytes_192 :: proc(data: []byte) -> [24]byte {
+    hash: [24]byte
+    ctx: botan.hash_t
+    botan.hash_init(&ctx, botan.HASH_TIGER_192, 0)
+    botan.hash_update(ctx, len(data) == 0 ? nil : &data[0], uint(len(data)))
+    botan.hash_final(ctx, &hash[0])
+    botan.hash_destroy(ctx)
+    return hash
+}
+
+// hash_stream_192 will read the stream in chunks and compute a
+// hash from its contents
+hash_stream_192 :: proc(s: io.Stream) -> ([24]byte, bool) {
+    hash: [24]byte
+    ctx: botan.hash_t
+    botan.hash_init(&ctx, botan.HASH_TIGER_192, 0)
+    buf := make([]byte, 512)
+    defer delete(buf)
+    i := 1
+    for i > 0 {
+        i, _ = s->impl_read(buf)
+        if i > 0 {
+            botan.hash_update(ctx, len(buf) == 0 ? nil : &buf[0], uint(i))
+        } 
+    }
+    botan.hash_final(ctx, &hash[0])
+    botan.hash_destroy(ctx)
+    return hash, true 
+}
+
+// hash_file_192 will read the file provided by the given handle
+// and compute a hash
+hash_file_192 :: proc(hd: os.Handle, load_at_once := false) -> ([24]byte, bool) {
+    if !load_at_once {
+        return hash_stream_192(os.stream_from_handle(hd))
+    } else {
+        if buf, ok := os.read_entire_file(hd); ok {
+            return hash_bytes_192(buf[:]), ok
+        }
+    }
+    return [24]byte{}, false
+}
+
+hash_192 :: proc {
+    hash_stream_192,
+    hash_file_192,
+    hash_bytes_192,
+    hash_string_192,
+}
+
+/*
+    Low level API
+*/
+
+Tiger_Context :: botan.hash_t
+
+init :: proc "contextless" (ctx: ^botan.hash_t, hash_size := 192) {
+    switch hash_size {
+        case 128: botan.hash_init(ctx, botan.HASH_TIGER_128, 0)
+        case 160: botan.hash_init(ctx, botan.HASH_TIGER_160, 0)
+        case 192: botan.hash_init(ctx, botan.HASH_TIGER_192, 0)
+    }
+}
+
+update :: proc "contextless" (ctx: ^botan.hash_t, data: []byte) {
+    botan.hash_update(ctx^, len(data) == 0 ? nil : &data[0], uint(len(data)))
+}
+
+final :: proc "contextless" (ctx: ^botan.hash_t, hash: []byte) {
+    botan.hash_final(ctx^, &hash[0])
+    botan.hash_destroy(ctx^)
+}