27 lines
770 B
Go
27 lines
770 B
Go
package pkcs12
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import (
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"errors"
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"unicode/utf16"
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)
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func bmpString(s string) ([]byte, error) {
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// References:
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// https://tools.ietf.org/html/rfc7292#appendix-B.1
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// http://en.wikipedia.org/wiki/Plane_(Unicode)#Basic_Multilingual_Plane
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// - non-BMP characters are encoded in UTF 16 by using a surrogate pair of 16-bit codes
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// EncodeRune returns 0xfffd if the rune does not need special encoding
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// - the above RFC provides the info that BMPStrings are NULL terminated.
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rv := make([]byte, 0, 2*len(s)+2)
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for _, r := range s {
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if t, _ := utf16.EncodeRune(r); t != 0xfffd {
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return nil, errors.New("string contains characters that cannot be encoded in UCS-2")
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}
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rv = append(rv, byte(r/256), byte(r%256))
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}
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rv = append(rv, 0, 0)
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return rv, nil
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}
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