@nostr-dev-kit/blossom/dist/utils/sha256.js

Blossom protocol support for NDK (Nostr Development Kit)

/**
 * Default implementation of SHA256 calculator
 * Uses Web Crypto API
 */
export class DefaultSHA256Calculator {
    /**
     * Calculate SHA256 hash of a file
     *
     * @param file File to hash
     * @returns Hash as hex string
     */
    async calculateSha256(file) {
        // Convert file to ArrayBuffer
        const buffer = await file.arrayBuffer();
        // Hash the buffer
        const hashBuffer = await crypto.subtle.digest("SHA-256", buffer);
        // Convert to hex string
        return Array.from(new Uint8Array(hashBuffer))
            .map((b) => b.toString(16).padStart(2, "0"))
            .join("");
    }
}
/**
 * Singleton instance of the default SHA256 calculator
 * Created lazily to avoid issues in non-browser environments
 */
let _defaultSHA256Calculator;
export function getDefaultSHA256Calculator() {
    if (!_defaultSHA256Calculator) {
        _defaultSHA256Calculator = new DefaultSHA256Calculator();
    }
    return _defaultSHA256Calculator;
}
// For backwards compatibility, export as defaultSHA256Calculator
export const defaultSHA256Calculator = {
    calculateSha256: async (file) => {
        return getDefaultSHA256Calculator().calculateSha256(file);
    },
};
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