@spec validate(String.t()) :: {:ok, String.t()} | {:error, String.t()}

Validates digital signature.

Rules

• Maximum 1000 characters
• Base64-encoded string format expected

Examples

iex> QRNBU.Validators.DigitalSignature.validate("SGVsbG8gV29ybGQ=")
{:ok, "SGVsbG8gV29ybGQ="}

iex> QRNBU.Validators.DigitalSignature.validate("")
{:error, "Digital signature cannot be empty"}

iex> QRNBU.Validators.DigitalSignature.validate(String.duplicate("A", 1001))
{:error, "Digital signature must not exceed 1000 characters"}