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Merge pull request #4641 from zolk3ri/fix/base32-error-handling
encoding/base32: Add RFC-compliant error handling and improve reliability
This commit is contained in:
Jeroen van Rijn
@@ -1,148 +1,230 @@
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package encoding_base32
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// @note(zh): Encoding utility for Base32
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// A secondary param can be used to supply a custom alphabet to
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// @link(encode) and a matching decoding table to @link(decode).
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// If none is supplied it just uses the standard Base32 alphabet.
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// Incase your specific version does not use padding, you may
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// truncate it from the encoded output.
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ENC_TABLE := [32]byte {
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'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
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'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
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'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',
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'Y', 'Z', '2', '3', '4', '5', '6', '7',
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}
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PADDING :: '='
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DEC_TABLE := [?]u8 {
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 26, 27, 28, 29, 30, 31, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
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15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 0, 0, 0, 0, 0,
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0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
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15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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}
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encode :: proc(data: []byte, ENC_TBL := ENC_TABLE, allocator := context.allocator) -> string {
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out_length := (len(data) + 4) / 5 * 8
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out := make([]byte, out_length)
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_encode(out, data)
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return string(out)
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}
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@private
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_encode :: proc(out, data: []byte, ENC_TBL := ENC_TABLE, allocator := context.allocator) {
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out := out
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data := data
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for len(data) > 0 {
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carry: byte
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switch len(data) {
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case:
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out[7] = ENC_TABLE[data[4] & 0x1f]
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carry = data[4] >> 5
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fallthrough
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case 4:
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out[6] = ENC_TABLE[carry | (data[3] << 3) & 0x1f]
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out[5] = ENC_TABLE[(data[3] >> 2) & 0x1f]
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carry = data[3] >> 7
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fallthrough
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case 3:
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out[4] = ENC_TABLE[carry | (data[2] << 1) & 0x1f]
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carry = (data[2] >> 4) & 0x1f
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fallthrough
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case 2:
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out[3] = ENC_TABLE[carry | (data[1] << 4) & 0x1f]
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out[2] = ENC_TABLE[(data[1] >> 1) & 0x1f]
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carry = (data[1] >> 6) & 0x1f
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fallthrough
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case 1:
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out[1] = ENC_TABLE[carry | (data[0] << 2) & 0x1f]
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out[0] = ENC_TABLE[data[0] >> 3]
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}
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if len(data) < 5 {
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out[7] = byte(PADDING)
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if len(data) < 4 {
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out[6] = byte(PADDING)
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out[5] = byte(PADDING)
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if len(data) < 3 {
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out[4] = byte(PADDING)
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if len(data) < 2 {
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out[3] = byte(PADDING)
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out[2] = byte(PADDING)
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}
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}
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}
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break
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}
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data = data[5:]
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out = out[8:]
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}
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}
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decode :: proc(data: string, DEC_TBL := DEC_TABLE, allocator := context.allocator) -> []byte #no_bounds_check{
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if len(data) == 0 {
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return nil
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}
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outi := 0
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data := data
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out := make([]byte, len(data) / 8 * 5, allocator)
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end := false
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for len(data) > 0 && !end {
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dbuf : [8]byte
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dlen := 8
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for j := 0; j < 8; {
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if len(data) == 0 {
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dlen, end = j, true
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break
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}
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input := data[0]
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data = data[1:]
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if input == byte(PADDING) && j >= 2 && len(data) < 8 {
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assert(!(len(data) + j < 8 - 1), "Corrupted input")
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for k := 0; k < 8-1-j; k +=1 {
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assert(len(data) < k || data[k] == byte(PADDING), "Corrupted input")
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}
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dlen, end = j, true
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assert(dlen != 1 && dlen != 3 && dlen != 6, "Corrupted input")
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break
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}
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dbuf[j] = DEC_TABLE[input]
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assert(dbuf[j] != 0xff, "Corrupted input")
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j += 1
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}
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switch dlen {
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case 8:
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out[outi + 4] = dbuf[6] << 5 | dbuf[7]
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fallthrough
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case 7:
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out[outi + 3] = dbuf[4] << 7 | dbuf[5] << 2 | dbuf[6] >> 3
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fallthrough
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case 5:
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out[outi + 2] = dbuf[3] << 4 | dbuf[4] >> 1
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fallthrough
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case 4:
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out[outi + 1] = dbuf[1] << 6 | dbuf[2] << 1 | dbuf[3] >> 4
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fallthrough
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case 2:
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out[outi + 0] = dbuf[0] << 3 | dbuf[1] >> 2
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}
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outi += 5
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}
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return out
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}
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// Base32 encoding/decoding implementation as specified in RFC 4648.
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// [[ More; https://www.rfc-editor.org/rfc/rfc4648.html ]]
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package encoding_base32
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// @note(zh): Encoding utility for Base32
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// A secondary param can be used to supply a custom alphabet to
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// @link(encode) and a matching decoding table to @link(decode).
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// If none is supplied it just uses the standard Base32 alphabet.
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// In case your specific version does not use padding, you may
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// truncate it from the encoded output.
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// Error represents errors that can occur during base32 decoding operations.
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// As per RFC 4648:
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// - Section 3.3: Invalid character handling
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// - Section 3.2: Padding requirements
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// - Section 6: Base32 encoding specifics (including block size requirements)
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Error :: enum {
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None,
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Invalid_Character, // Input contains characters outside the specified alphabet
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Invalid_Length, // Input length is not valid for base32 (must be a multiple of 8 with proper padding)
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Malformed_Input, // Input has improper structure (wrong padding position or incomplete groups)
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}
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Validate_Proc :: #type proc(c: byte) -> bool
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@private
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_validate_default :: proc(c: byte) -> bool {
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return (c >= 'A' && c <= 'Z') || (c >= '2' && c <= '7')
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}
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@(rodata)
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ENC_TABLE := [32]byte {
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'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
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'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
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'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',
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'Y', 'Z', '2', '3', '4', '5', '6', '7',
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}
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PADDING :: '='
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@(rodata)
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DEC_TABLE := [256]u8 {
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 26, 27, 28, 29, 30, 31, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
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15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 0, 0, 0, 0, 0,
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0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
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15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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}
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encode :: proc(data: []byte, ENC_TBL := ENC_TABLE, allocator := context.allocator) -> string {
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out_length := (len(data) + 4) / 5 * 8
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out := make([]byte, out_length, allocator)
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_encode(out, data, ENC_TBL)
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return string(out[:])
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}
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@private
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_encode :: proc(out, data: []byte, ENC_TBL := ENC_TABLE, allocator := context.allocator) {
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out := out
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data := data
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for len(data) > 0 {
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carry: byte
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switch len(data) {
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case:
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out[7] = ENC_TBL[data[4] & 0x1f]
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carry = data[4] >> 5
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fallthrough
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case 4:
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out[6] = ENC_TBL[carry | (data[3] << 3) & 0x1f]
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out[5] = ENC_TBL[(data[3] >> 2) & 0x1f]
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carry = data[3] >> 7
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fallthrough
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case 3:
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out[4] = ENC_TBL[carry | (data[2] << 1) & 0x1f]
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carry = (data[2] >> 4) & 0x1f
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fallthrough
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case 2:
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out[3] = ENC_TBL[carry | (data[1] << 4) & 0x1f]
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out[2] = ENC_TBL[(data[1] >> 1) & 0x1f]
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carry = (data[1] >> 6) & 0x1f
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fallthrough
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case 1:
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out[1] = ENC_TBL[carry | (data[0] << 2) & 0x1f]
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out[0] = ENC_TBL[data[0] >> 3]
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}
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if len(data) < 5 {
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out[7] = byte(PADDING)
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if len(data) < 4 {
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out[6] = byte(PADDING)
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out[5] = byte(PADDING)
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if len(data) < 3 {
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out[4] = byte(PADDING)
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if len(data) < 2 {
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out[3] = byte(PADDING)
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out[2] = byte(PADDING)
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}
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}
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}
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break
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}
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data = data[5:]
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out = out[8:]
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}
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}
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@(optimization_mode="favor_size")
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decode :: proc(
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data: string,
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DEC_TBL := DEC_TABLE,
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validate: Validate_Proc = _validate_default,
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allocator := context.allocator) -> (out: []byte, err: Error) {
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if len(data) == 0 {
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return nil, .None
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}
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// Check minimum length requirement first
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if len(data) < 2 {
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return nil, .Invalid_Length
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}
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// Validate characters using provided validation function
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for i := 0; i < len(data); i += 1 {
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c := data[i]
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if c == byte(PADDING) {
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break
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}
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if !validate(c) {
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return nil, .Invalid_Character
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}
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}
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// Validate padding and length
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data_len := len(data)
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padding_count := 0
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for i := data_len - 1; i >= 0; i -= 1 {
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if data[i] != byte(PADDING) {
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break
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}
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padding_count += 1
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}
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// Check for proper padding and length combinations
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if padding_count > 0 {
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// Verify no padding in the middle
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for i := 0; i < data_len - padding_count; i += 1 {
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if data[i] == byte(PADDING) {
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return nil, .Malformed_Input
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}
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}
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content_len := data_len - padding_count
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mod8 := content_len % 8
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required_padding: int
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switch mod8 {
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case 2: required_padding = 6 // 2 chars need 6 padding chars
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case 4: required_padding = 4 // 4 chars need 4 padding chars
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case 5: required_padding = 3 // 5 chars need 3 padding chars
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case 7: required_padding = 1 // 7 chars need 1 padding char
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case: required_padding = 0
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}
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if required_padding > 0 {
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if padding_count != required_padding {
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return nil, .Malformed_Input
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}
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} else if mod8 != 0 {
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return nil, .Malformed_Input
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}
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} else {
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// No padding - must be multiple of 8
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if data_len % 8 != 0 {
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return nil, .Malformed_Input
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}
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}
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// Calculate decoded length: 5 bytes for every 8 input chars
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input_chars := data_len - padding_count
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out_len := input_chars * 5 / 8
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out = make([]byte, out_len, allocator)
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defer if err != .None {
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delete(out)
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}
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// Process input in 8-byte blocks
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outi := 0
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for i := 0; i < input_chars; i += 8 {
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buf: [8]byte
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block_size := min(8, input_chars - i)
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// Decode block
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for j := 0; j < block_size; j += 1 {
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buf[j] = DEC_TBL[data[i + j]]
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}
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// Convert to output bytes based on block size
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bytes_to_write := block_size * 5 / 8
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switch block_size {
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case 8:
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out[outi + 4] = (buf[6] << 5) | buf[7]
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fallthrough
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case 7:
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out[outi + 3] = (buf[4] << 7) | (buf[5] << 2) | (buf[6] >> 3)
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fallthrough
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case 5:
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out[outi + 2] = (buf[3] << 4) | (buf[4] >> 1)
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fallthrough
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case 4:
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out[outi + 1] = (buf[1] << 6) | (buf[2] << 1) | (buf[3] >> 4)
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fallthrough
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case 2:
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out[outi] = (buf[0] << 3) | (buf[1] >> 2)
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}
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outi += bytes_to_write
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}
|
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|
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return
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}
|
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227
core/encoding/base32/base32_test.odin
Normal file
227
core/encoding/base32/base32_test.odin
Normal file
@@ -0,0 +1,227 @@
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package encoding_base32
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import "core:testing"
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import "core:bytes"
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@(test)
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test_base32_decode_valid :: proc(t: ^testing.T) {
|
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// RFC 4648 Section 10 - Test vectors
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cases := [?]struct {
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||||
input, expected: string,
|
||||
}{
|
||||
{"", ""},
|
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{"MY======", "f"},
|
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{"MZXQ====", "fo"},
|
||||
{"MZXW6===", "foo"},
|
||||
{"MZXW6YQ=", "foob"},
|
||||
{"MZXW6YTB", "fooba"},
|
||||
{"MZXW6YTBOI======", "foobar"},
|
||||
}
|
||||
|
||||
for c in cases {
|
||||
output, err := decode(c.input)
|
||||
if output != nil {
|
||||
defer delete(output)
|
||||
}
|
||||
testing.expect_value(t, err, Error.None)
|
||||
expected := transmute([]u8)c.expected
|
||||
if output != nil {
|
||||
testing.expect(t, bytes.equal(output, expected))
|
||||
} else {
|
||||
testing.expect(t, len(c.expected) == 0)
|
||||
}
|
||||
}
|
||||
}
|
||||
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||||
@(test)
|
||||
test_base32_encode :: proc(t: ^testing.T) {
|
||||
// RFC 4648 Section 10 - Test vectors
|
||||
cases := [?]struct {
|
||||
input, expected: string,
|
||||
}{
|
||||
{"", ""},
|
||||
{"f", "MY======"},
|
||||
{"fo", "MZXQ===="},
|
||||
{"foo", "MZXW6==="},
|
||||
{"foob", "MZXW6YQ="},
|
||||
{"fooba", "MZXW6YTB"},
|
||||
{"foobar", "MZXW6YTBOI======"},
|
||||
}
|
||||
|
||||
for c in cases {
|
||||
output := encode(transmute([]byte)c.input)
|
||||
defer delete(output)
|
||||
testing.expect(t, output == c.expected)
|
||||
}
|
||||
}
|
||||
|
||||
@(test)
|
||||
test_base32_decode_invalid :: proc(t: ^testing.T) {
|
||||
// Section 3.3 - Non-alphabet characters
|
||||
{
|
||||
// Characters outside alphabet
|
||||
input := "MZ1W6YTB" // '1' not in alphabet (A-Z, 2-7)
|
||||
output, err := decode(input)
|
||||
if output != nil {
|
||||
defer delete(output)
|
||||
}
|
||||
testing.expect_value(t, err, Error.Invalid_Character)
|
||||
}
|
||||
{
|
||||
// Lowercase not allowed
|
||||
input := "mzxq===="
|
||||
output, err := decode(input)
|
||||
if output != nil {
|
||||
defer delete(output)
|
||||
}
|
||||
testing.expect_value(t, err, Error.Invalid_Character)
|
||||
}
|
||||
|
||||
// Section 3.2 - Padding requirements
|
||||
{
|
||||
// Padding must only be at end
|
||||
input := "MZ=Q===="
|
||||
output, err := decode(input)
|
||||
if output != nil {
|
||||
defer delete(output)
|
||||
}
|
||||
testing.expect_value(t, err, Error.Malformed_Input)
|
||||
}
|
||||
{
|
||||
// Missing padding
|
||||
input := "MZXQ" // Should be MZXQ====
|
||||
output, err := decode(input)
|
||||
if output != nil {
|
||||
defer delete(output)
|
||||
}
|
||||
testing.expect_value(t, err, Error.Malformed_Input)
|
||||
}
|
||||
{
|
||||
// Incorrect padding length
|
||||
input := "MZXQ=" // Needs 4 padding chars
|
||||
output, err := decode(input)
|
||||
if output != nil {
|
||||
defer delete(output)
|
||||
}
|
||||
testing.expect_value(t, err, Error.Malformed_Input)
|
||||
}
|
||||
{
|
||||
// Too much padding
|
||||
input := "MY=========" // Extra padding chars
|
||||
output, err := decode(input)
|
||||
if output != nil {
|
||||
defer delete(output)
|
||||
}
|
||||
testing.expect_value(t, err, Error.Malformed_Input)
|
||||
}
|
||||
|
||||
// Section 6 - Base32 block size requirements
|
||||
{
|
||||
// Single character (invalid block)
|
||||
input := "M"
|
||||
output, err := decode(input)
|
||||
if output != nil {
|
||||
defer delete(output)
|
||||
}
|
||||
testing.expect_value(t, err, Error.Invalid_Length)
|
||||
}
|
||||
}
|
||||
|
||||
@(test)
|
||||
test_base32_roundtrip :: proc(t: ^testing.T) {
|
||||
cases := [?]string{
|
||||
"",
|
||||
"f",
|
||||
"fo",
|
||||
"foo",
|
||||
"foob",
|
||||
"fooba",
|
||||
"foobar",
|
||||
}
|
||||
|
||||
for input in cases {
|
||||
encoded := encode(transmute([]byte)input)
|
||||
defer delete(encoded)
|
||||
decoded, err := decode(encoded)
|
||||
if decoded != nil {
|
||||
defer delete(decoded)
|
||||
}
|
||||
testing.expect_value(t, err, Error.None)
|
||||
testing.expect(t, bytes.equal(decoded, transmute([]byte)input))
|
||||
}
|
||||
}
|
||||
|
||||
@(test)
|
||||
test_base32_custom_alphabet :: proc(t: ^testing.T) {
|
||||
custom_enc_table := [32]byte{
|
||||
'0', '1', '2', '3', '4', '5', '6', '7',
|
||||
'8', '9', 'A', 'B', 'C', 'D', 'E', 'F',
|
||||
'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N',
|
||||
'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V',
|
||||
}
|
||||
|
||||
custom_dec_table: [256]u8
|
||||
for i := 0; i < len(custom_enc_table); i += 1 {
|
||||
custom_dec_table[custom_enc_table[i]] = u8(i)
|
||||
}
|
||||
|
||||
/*
|
||||
custom_dec_table := [256]u8{
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x00-0x0f
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x10-0x1f
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x20-0x2f
|
||||
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 0, 0, 0, 0, 0, // 0x30-0x3f ('0'-'9')
|
||||
0, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, // 0x40-0x4f ('A'-'O')
|
||||
25, 26, 27, 28, 29, 30, 31, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x50-0x5f ('P'-'V')
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x60-0x6f
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x70-0x7f
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x80-0x8f
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x90-0x9f
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0xa0-0xaf
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0xb0-0xbf
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0xc0-0xcf
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0xd0-0xdf
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0xe0-0xef
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0xf0-0xff
|
||||
}
|
||||
*/
|
||||
|
||||
custom_validate :: proc(c: byte) -> bool {
|
||||
return (c >= '0' && c <= '9') || (c >= 'A' && c <= 'V') || c == byte(PADDING)
|
||||
}
|
||||
|
||||
cases := [?]struct {
|
||||
input: string,
|
||||
enc_expected: string,
|
||||
}{
|
||||
{"f", "CO======"},
|
||||
{"fo", "CPNG===="},
|
||||
{"foo", "CPNMU==="},
|
||||
}
|
||||
|
||||
for c in cases {
|
||||
// Test encoding
|
||||
encoded := encode(transmute([]byte)c.input, custom_enc_table)
|
||||
defer delete(encoded)
|
||||
testing.expect(t, encoded == c.enc_expected)
|
||||
|
||||
// Test decoding
|
||||
decoded, err := decode(encoded, custom_dec_table, custom_validate)
|
||||
defer if decoded != nil {
|
||||
delete(decoded)
|
||||
}
|
||||
|
||||
testing.expect_value(t, err, Error.None)
|
||||
testing.expect(t, bytes.equal(decoded, transmute([]byte)c.input))
|
||||
}
|
||||
|
||||
// Test invalid character detection
|
||||
{
|
||||
input := "WXY=====" // Contains chars not in our alphabet
|
||||
output, err := decode(input, custom_dec_table, custom_validate)
|
||||
if output != nil {
|
||||
delete(output)
|
||||
}
|
||||
testing.expect_value(t, err, Error.Invalid_Character)
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user